CN112050076B

CN112050076B - LNG filling system

Info

Publication number: CN112050076B
Application number: CN202010945166.6A
Authority: CN
Inventors: 王新宇; 司跃
Original assignee: Anhui Changjiang Liquefied Natural Gas Co ltd; Huainan Mining Group Co Ltd
Current assignee: Anhui Changjiang Liquefied Natural Gas Co ltd; Huainan Mining Group Co Ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2022-09-30
Anticipated expiration: 2040-09-10
Also published as: CN112050076A

Abstract

The invention discloses an LNG filling system, which comprises a front platform and a rear tank yard, wherein the front platform comprises a filling platform and a tank platform; the rear tank yard comprises an empty box yard, a heavy box yard and a yard liquid collecting pool, wherein the empty box yard and the heavy box yard are distributed at intervals, and annular transportation roads are arranged outside the empty box yard and the heavy box yard; the empty box yard is internally provided with empty box positions which are arranged in a matrix manner, the yard is internally provided with liquid guide channels, and a plurality of liquid guide channels are converged into a yard liquid collecting pool; the rear tank yard is positioned behind the shoreline and is connected with a tank platform arranged on the shoreline through a road; the invention has the beneficial effects that: the length of a conveying pipeline of the LNG filling system is shortened, the invalid loss amount of LNG is reduced, a cold insulation circulating pipeline system is cancelled, the generation amount of BOG is reduced, and the engineering investment is reduced by combining the front platform with the movable LNG tank.

Description

LNG filling system

Technical Field

The invention relates to the field of LNG filling of ships, in particular to an LNG filling system.

Background

At present, although some achievements are achieved in the field of 'oil-to-gas' of ships in China, the pilot operation of LNG power ships in Yangtze river, Jinghang Dacanal and the like is successful. At present, LNG fuel water filling mainly comprises: the method comprises three modes of ship-to-ship, shore station-to-ship and vehicle-to-ship, and a ship LNG fuel filling mode.

Ship-to-Ship filling (Ship-to-Ship bunkering, abbreviated as STS), wherein the STS can be carried out in wharfs, anchorages and sails, and the STS also comprises filling of a wharf Ship and filling of a Ship by a marine floating filling facility; the ship-ship filling is characterized in that an LNG filling ship performs LNG filling work on a filled ship, the LNG filling ship is a brand-new green energy-saving environment-friendly ship model which is used for providing LNG fuel filling for various cargo ships, container ships, chemical ships, kernel LNG filling wharfs, inner rivers, coastal LNG shore-based filling stations and the like which adopt LNG single/double fuel power, and can also provide LNG water transportation for domestic rivers, coastal shore-based filling stations, coastal surrounding cities and large-scale factory and mining enterprises.

As in application No.: 202010123569.2, 1. A layout of a pontoon of an offshore natural gas filling station, characterized in that the natural gas pontoon comprises devices and equipment, LNG storage tank equipment and system components, filling and refueling operating locations, living quarters, machinery quarters, service quarters, the LNG storage tank equipment and system components being provided on one freeboard deck, the machinery quarters, service quarters being provided on one deck of cleats, the main living quarters being provided on three decks, part of the living quarters and part of the service quarters being provided on two decks. However, when the ship is used as a water transport vehicle, the ship is subjected to risks of natural factors such as gusty wind, rainstorm, lightning stroke and the like which cannot be resisted, self factors such as failure of ship instruments and equipment and malfunction of an engine body can occur, and artificial factors such as pirate hijacking and misoperation of a crew under an accident can also occur. As a novel LNG ship with high technical difficulty, the risk is also caused, so that the filling form is poor in operability and high in investment cost;

vehicle-ship filling (Tank truck-to-ship bunkering, abbreviated as TTS); TTS filling is to fill LNG from a tank of a tank car to a ship parked at a port, usually by a hose or a connecting arm connected between the tank car and the ship, and is somewhat portable and low-investment, as described in application numbers: 201721460624.7, a differential pressure type LNG vehicle filling system, which is characterized in that the system comprises a tank car storage tank and a target storage tank; an LNG filling pipeline system and a pressure regulating pipeline system are arranged between the tank car storage tank and the target storage tank; the LNG filling pipeline system and the pressure regulating pipeline system are respectively connected with the tank car storage tank and the target storage tank; and the pressure regulating pipeline system is used for regulating the pressure difference between the tank car storage tank and the day mark storage tank, so that the pressure in the tank car is greater than the pressure in the target storage tank, and the LNG in the tank car storage tank is delivered to the target storage tank through the LNG filling pipeline system. The filling system integrates various pipelines, so that the capacity of the tank box is reduced, the filling quantity of the whole filling system is small, the filling efficiency is low, and the filling speed and the capacity are limited, so that the capacity of the filling system is limited for large ships.

In the PTS filling method, LNG is filled from a fixed storage site on land to a ship moored at a nearby dock through a cryogenic pipeline or hose. The large capacity requirement can be met on the transmission speed and the capacity, but because PTS filling needs fixed facilities near a wharf, for example, the storage tank capacity of the existing onshore filling station of Halhjem in Norway is larger (generally 1000 m) ³ ) In order to control risks, a certain safety distance is reserved between the storage tank and the filling station, the LNG tank box is located on the shore and behind and away from the filled ship, the filling pipeline is buried underground, the pipeline is long, the filling form is caused, and the wharf shoreline is occupied greatly.

An LNG tank (low-temperature liquid tank container) belongs to a pressure container. The LNG tank is of a double-layer structure, Q345R steel is adopted as a shell material of the tank body, S30408 austenitic stainless steel is adopted as an inner tank material, the shell mainly bears pressure generated inside the tank body, and the inner tank and the cold insulation layer are used for cold insulation.

Be equipped with the control box on the current LNG tank case, be equipped with liquid phase operation pipeline, gaseous phase operation pipeline, pressure boost pipeline, safety control system in the control box, pipe-line system is the major part that LNG tank container realized service function.

The liquid phase operation pipeline comprises an upper liquid inlet pipeline and a lower liquid inlet pipeline, when the filling effect is achieved, the upper liquid inlet pipeline and the lower liquid inlet pipeline can be used, the upper liquid inlet pipeline is provided with a spraying device, and when the tank box is filled for the first time, hot gas in the tank can be liquefied, so that the tank can be cooled up and down quickly. Because the LNG is filled and unloaded at different times, the lower liquid inlet and outlet pipeline can realize lower liquid inlet and liquid discharge.

The gas phase operation pipeline comprises a gas phase valve and a gas phase emergency cut-off valve, and the gas is directly output from the pipeline, and meanwhile, the gas phase operation pipeline is used as a gas loop pipe when the liquid is pressurized and discharged, and is used as a discharge pipeline when the pressure of the inner tank is ultrahigh or the pressure is discharged.

The pressurization system comprises a pressurization valve, liquid is discharged from the pressurization valve, the liquid is gasified into gas through pressurization in the outside, and then the gas returns to the top of the inner cylinder through the gas phase valve in the gas phase pipeline for pressurization.

The safety control system consists of a pressure gauge, a liquid level meter combination valve, a liquid level meter root valve, an equipment safety valve, a three-way valve, a flame arrester, a pipeline blow-off valve, an equipment blow-off valve and an outer tank explosion-proof device. The pressure gauge and the liquid level gauge are arranged in the inner part, and the liquid level gauge combination valve and the liquid level gauge root valve are instrument control valves; the bleeding valve is divided into a gas-phase bleeding valve and a liquid-phase pipeline bleeding valve, the gas-phase bleeding valve is used for manually bleeding gas in a gas-phase space of the tank box, the pressure of the tank body can be effectively reduced, the bleeding valve in the liquid-phase pipeline aims to timely remove residual liquid in the pipeline, and the problem that the pipeline is damaged due to volume expansion of low-temperature liquid in the pipeline caused by gasification due to temperature rise is avoided; the outer tank explosion-proof device is an outer tank safety device, and is opened to release pressure under the condition that interlayer vacuum fails in an accident situation; the flame arrester is used for preventing flame from returning when the emptying pipe mouth catches fire.

The major hazardous substances present in the LNG project are LNG (liquefied natural GAS) and BOG (BOG is short for BOIL-OFF GAS, and is methane GAS from the vaporization of product LNG). The major hazardous component of LNG and BOG is methane. The reactivity of methane is lower than that of other fuel oil, the potential severity of explosion effect is lower than that of hydrogen, propane and ethylene, but the methane is flammable and explosive, and the explosion limit of the methane in the air is 5-15.8% (V), so that LNG is usually stored in a special storage tank in a liquid state at normal pressure. LNG is generally stored and transported without consideration of pressure, thus avoiding the risk of complete rupture of the vessel. The risk of fire during unloading, storage and transport is classified as class a. The characteristics of a fire hazard generated by LNG are high risk, high temperature, strong radiation, deflagration and easy explosion. The consequences of an LNG fire are manifold, and leaking material may cause diffusion, boiling, evaporation, etc., if the gas diffuses into a confined space, an explosion, or a flash fire, etc., and pool fires may occur at the source of the leak.

Therefore, the safety distance is particularly important for the arrangement of the LNG tank yard.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: how to solve the problem that the large-scale pipeline of the existing filling system is long, the waste is serious and the cost is high.

The invention solves the technical problems through the following technical means:

an LNG filling system comprises a front platform and a rear tank yard, wherein the front platform comprises a filling platform and a tank platform, the filling platform is arranged on a shore line, the tank platform is arranged behind the shore line, the filling platform is connected with the tank platform through a connecting section, a hose crane and a metering pry which are used for connecting a filling party and a ship are arranged on the filling platform, and the tank platform is provided with a plurality of placement points and filling prys for movable LNG tanks; the LNG tank boxes are connected with the filling pry, and the filling pry is connected with the metering pry;

the rear tank yard comprises an empty box yard, a heavy box yard and a yard liquid collecting pool, wherein protective enclosing walls are arranged on the peripheries of the empty box yard and the heavy box yard, at least one outlet and at least one inlet are arranged on the protective enclosing walls, the empty box yard and the heavy box yard are distributed at intervals, and annular transportation roads are arranged outside the empty box yard and the heavy box yard; empty tank positions arranged in a matrix form are arranged in the empty tank yard, empty LNG tank boxes are placed on the empty tank positions, a liquid guide channel is arranged on the side surface of each row or each emptying tank position, and the liquid guide channels are converged into a yard liquid collecting pool; the heavy tank yard is internally provided with heavy tank positions which are arranged in a matrix manner, the LNG tank filled with LNG is positioned at the heavy tank positions, the side surface of each row or each row of heavy tank positions is provided with a liquid guide channel, and a plurality of liquid guide channels are converged into the yard liquid collecting pool;

the rear tank yard is positioned behind the shoreline and is connected with a tank platform arranged on the shoreline through a road.

The working process of the invention is as follows: it is a plurality of the LNG tank is by the heavy case storage yard delivery to the tank container platform of rear tank storage yard, will be a plurality of the LNG tank is connected with the filling sled the hose loop wheel machine will measure the sled and be connected with the injected boats and ships, and the liquid phase pressure boost mouth of LNG tank gets into the filling sled, gets into the LNG tank through the gaseous phase mouth of LNG tank after pressure boost gasification, and is a plurality of the liquid phase mouth of LNG tank gets into the liquid phase filling pipeline of measurement sled after getting into the filling sled, gets into the liquid phase entry of injected boats and ships after, and the BOG that the injected boats and ships produced returns the gaseous phase return pipeline of measurement sled, and is a plurality of by the gaseous phase mouth of LNG tank, gets into the filling by the gaseous phase mouth of LNG tank the empty LNG tank returns the empty tank storage yard of rear tank storage yard after the LNG tank storage yard is accomplished. The invention is an innovation of the project by adopting an integrated arrangement form of the filling platform arranged in front of the wharf and the tank yard arranged behind, and has obvious benefits; by arranging a rear LNG tank yard nearby, rear LNG heavy tanks can be shipped in time according to the LNG filling condition of a dock preposed filling platform to replace empty LNG tanks after filling, and meanwhile, the replaced empty LNG tanks are transported to the empty tank yard or an LNG tank (tank car) filling area to fill the empty LNG tanks in time, so that the tank utilization rate is increased; the dock front filling platform and the rear tank yard are arranged nearby, so that the transportation distance of the LNG tank can be greatly shortened, and the transportation cost of a filling station is reduced; due to the fact that the transport distance of the LNG tank box is shortened, the transfer time of the LNG tank box is saved, and the invalid loss amount of LNG is reduced; a cold insulation circulating pipeline system of an LNG filling system is cancelled; the production of BOG evaporation gas is reduced, and the operation cost and the engineering investment of a filling system are reduced.

Preferably, a vehicle is included for transporting the LNG tank, the LNG tank being transported by the vehicle between the tank platform and the rear feeding point.

Preferably, the distance between the tank platform and the injected vessel is 13-18 m.

The simulation of the invention is carried out when a typical fire injection event occurs by filling the berth, and the simulation is 15Kw/m ² The maximum influence range of the heat radiation is 12.38m, so that the whole process facility on the tank platform is recommended to be deviated far away from the shore lineMoving to make the inland river motor ship at 15Kw/m ² The minimum distance is 12.38m outside the range of influence of the heat radiation, and if it is too far away, the advantages of the previous arrangement are not achieved, so that the distance between the tank platform and the filling platform is preferably 13-18 m.

Preferably, the ship pier structure further comprises a plurality of ship piers, each ship pier comprises at least one ship mooring pier and at least one ship mooring pier, the ship mooring piers and the filling platform are sequentially arranged, and the tank platform is arranged behind the filling platform and is connected with the adjacent ship piers through a connecting section.

Preferably, the filling pry comprises a filling pump and a pressurization vaporizer, liquid phase ports of the LNG tank boxes are connected with the filling pump, an outlet of the filling pump is connected with the metering pry, liquid phase pressurization ports of the LNG tank boxes are connected with the pressurization vaporizer, and a gasification outlet of the pressurization vaporizer returns to the LNG tank box through a gas phase port of the LNG tank box.

Preferably, the nitrogen injection device further comprises a nitrogen purging system, the nitrogen purging system is connected with the pipeline of the injection pry and the pipeline of the metering pry, and after the injection is completed, nitrogen is blown into the pipelines of the injection pry and the metering pry.

The nitrogen purging system directly blows residual gas and liquid to the diffusing port to be diffused, and accidents are avoided.

Preferably, still include the heater, measurement sled internal pipeline all be equipped with a plurality of interfaces on filling sled internal pipeline and measurement sled and filling sled between the pipeline, interface and heater entry linkage, heater export is for being arranged in distributing BOG to the mouth that diffuses in the air.

Preferably, the number of the LNG tanks is three, and the volume of LNG in the tanks is 120m ³ 。

Preferably, every ten tank boxes of the empty tank yard are in one group, each row comprises more than one group of tank boxes, the empty tank yard has at least 3 rows of tank boxes, the heavy tank yard has one group of every ten tank boxes, each row comprises more than one group of tank boxes, and the heavy tank yard has at least 3 rows of tank boxes.

Preferably, each group of the tank boxes of the empty tank yard and the heavy tank yard are arranged in a 2 x 5 mode, a vehicle channel is arranged between adjacent rows, and a vehicle road is arranged between each tank box and the protective enclosing wall.

Preferably, the distance between two rows in each group of tank boxes is at least 3m, and the distance between adjacent rows is at least 1 m.

Preferably, the vertical distance between the empty box yard and the outlet and the vertical distance between the heavy box yard and the inlet are both not less than 20 m.

Preferably, empty case storage yard one side sets up the office region, and the office region is not less than 65m apart from the empty case storage yard, heavy case storage yard one side sets up mobile machinery storehouse, emergency equipment storehouse, heavy case storage yard and mobile machinery storehouse, emergency equipment storehouse distance are not less than 30m, the collecting tank of empty case storage yard and the collecting tank equipartition of heavy case storage yard is in the one side of keeping away from the office region, the collecting tank is apart from the office region distance and is not less than 81 m.

Preferably, the size of the yard sumps is 4 m.

Preferably, the LNG tank yard is at least 150m in-line from the front filling station.

The invention has the advantages that:

(1) the integral arrangement form of the filling platform arranged in front of the wharf and the tank yard arranged behind the wharf is an innovation of the project, and the benefit is obvious; by arranging a rear LNG tank yard nearby, rear LNG heavy tanks can be shipped in time according to the LNG filling condition of a dock preposed filling platform to replace empty LNG tanks after filling, and meanwhile, the replaced empty LNG tanks are transported to the empty tank yard or an LNG tank (tank car) filling area to fill the empty LNG tanks in time, so that the tank utilization rate is increased; the dock front filling platform and the rear tank yard are arranged nearby, so that the transportation distance of the LNG tank can be greatly shortened, and the transportation cost of a filling station is reduced; the transportation distance of the LNG tank is shortened, so that the transfer time of the LNG tank is saved, and the invalid loss amount of LNG is reduced; a cold insulation circulating pipeline system of an LNG filling system is cancelled; the production of BOG evaporated gas is reduced, and the operation cost and the engineering investment of a filling system are reduced;

(2) the method comprises the following steps that an empty box yard and a heavy box yard are arranged adjacently, the transportation of the empty box yard and the heavy box yard is realized through an annular transportation road arranged outside the yard, and the LNG tank yard meets the safety requirement through the arrangement of an external protective enclosing wall and a liquid collecting pool; the tank yard is connected with a wharf arranged on a shore line through a road, when the tank yard is used, a full liquid tank is transported to a filling station through a container truck or other vehicles for filling, and after filling is finished, an empty LNG tank is transported to an empty tank yard; the ship-to-ship tank truck is not required to be integrated with other filling equipment, and compared with a tank truck-to-ship filling mode, the ship-to-ship tank truck is low in transportation risk;

(3) defining the minimum safe distance and the optimal distance between the LNG power motor ship and an LNG tank of a front filling system; simulation at typical jet fire events by filling the berth, 15Kw/m ² The maximum influence range of the heat radiation is 12.38m, so that the whole process facility on the tank platform is recommended to be deviated to a position far away from the shore line, and the inland river motor ship is enabled to be at 15Kw/m ² The minimum distance is 12.38m when the range of the influence of heat radiation is out, and if the minimum distance is too far away, a series of advantages of the prior art cannot be achieved, so that the distance between the tank platform and the filling platform is preferably 13-18 m;

(4) by quantitatively analyzing the thermal radiation and vapor cloud diffusion boundary, the distance between the LNG liquid collecting tank and office areas such as dormitory buildings, comprehensive buildings, office buildings, main control rooms and the like is determined to be not less than 81m through research, the LNG liquid collecting tank is arranged on one side of the tank yard far away from the office areas, the distance between corresponding building and the tank yard is effectively shortened, and conditions are provided for realizing functional requirements in a purchase area;

(5) according to the thermal radiation and vapor cloud diffusion boundary of the quantitative analysis report, the distances from the LNG tank to a dormitory building, a comprehensive building and an office building are determined, the distances from the LNG tank to a mobile machinery warehouse and an emergency equipment warehouse are not less than 30m, and the distances from a entrance guard (an entrance and an exit) are not less than 20m, so that the utilization efficiency of the purchased land parcel is effectively improved on the premise of ensuring the efficient stacking scale and safety.

Drawings

FIG. 1 is a schematic diagram of an LNG filling system according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a front stage;

FIG. 3 is an enlarged schematic view of the filling station (A in FIG. 1);

FIG. 4 is an enlarged schematic view of the tank deck (B in FIG. 1);

FIG. 5 is a schematic diagram of the construction of a rear tank yard;

FIG. 6 is a schematic view of an empty tank yard;

FIG. 7 is a schematic view of a heavy box yard;

FIG. 8 is a schematic view of the rear land LNG tank yard and surrounding facility layout;

FIG. 9 is a schematic illustration of the priming process;

fig. 10 is a schematic illustration of the LNG tank and filling skid connection;

FIG. 11 is a schematic view of a metering pry connection;

FIG. 12 is a schematic view of a heater connection;

fig. 13 is a schematic configuration diagram of an LNG refueling system in an initial scheme;

FIG. 13-1 is an enlarged view at C of FIG. 13;

fig. 14 is a schematic structural diagram of a middle front platform of the LNG filling system of the scheme;

FIG. 14-1 is an enlarged view at D of FIG. 14;

FIG. 14-2 is a 7-S jet fire event analysis interface;

FIG. 14-3 is an 8-S jet fire event analysis interface;

FIG. 14-4 is a 9-S jet fire event analysis interface;

FIG. 14-5 is a 10-S/FB jet fire event analysis interface;

FIG. 14-6 is a spark event analysis interface of 11-S;

FIGS. 14-7 are the jet fire event analysis interface of 12-S;

FIGS. 14-8 are port 13 jet fire event analysis interfaces;

FIG. 15-1 is an analysis interface for a 7-M1 flashover event;

FIG. 15-2 is an analysis interface for an 8-M1 flash event;

FIG. 15-3 is an analysis interface for a 9-M1 flash event;

FIG. 15-4 is an analysis interface for an 11-M1/FB flash event;

FIGS. 15-5 are analysis interfaces for a 12-M1/FB flash fire event;

FIGS. 15-6 are interfaces for analyzing a node 12 gas phase dispensing event;

FIG. 16-1 is an analysis interface of a fill area sump generation sump fire;

FIG. 16-2 shows a charge area sump gas cloud diffusion map;

FIG. 17-1 is a 1-S jet fire event analysis interface;

FIG. 17-2 is a 2-S jet fire event analysis interface;

FIG. 17-3 is a 3-S jet fire event analysis interface;

FIG. 17-4 is a 4-S jet fire event analysis interface;

FIGS. 17-5 are the jet fire event analysis interface for node 5;

FIGS. 17-6 are interfaces for analysis of the fire event at node 5;

FIGS. 17-7 are the jet fire event analysis interface for node 6;

FIGS. 17-8 are port fire event analysis interfaces for node 6;

FIGS. 17-9 are port 5 jet fire event analysis interfaces;

FIGS. 17-10 are fire event analysis interfaces for node 5;

FIGS. 17-11 are interfaces for analysis of the fire event at node 6;

FIGS. 17-12 are port fire event analysis interfaces for node 6;

FIG. 18-1 is a 1-M jet fire event analysis interface;

FIG. 18-2 is a 2-M jet fire event analysis interface;

FIG. 18-3 is a 3-M jet fire event analysis interface;

FIG. 18-4 is a 4-M jet fire event analysis interface;

18-5 are interfaces for analyzing a flash event for node 5;

18-6 are interfaces for analyzing a flash event for node 6;

FIG. 19-1 heavy box yard # 1 catch basin fire impact area analysis interface;

FIG. 19-2 is a view showing an interface for analyzing the influence range of the fire in the # 2 collecting tank of the heavy-box yard;

FIG. 19-3 heavy box yard # 3 sump fire impact range analysis interface;

FIG. 19-4 is a heavy box yard # 1 sump gas cloud spread impact area analysis interface;

FIG. 19-5 is a heavy box yard 2# sump gas cloud diffusion influence range analysis interface;

FIGS. 19 to 6 are the interface for analyzing the influence range of the air cloud diffusion in the 3# collecting tank of the heavy-box yard;

FIG. 19-7 empty box yard No. 4 catch basin fire impact area analysis interface;

FIG. 19-8 empty box yard No. 5 collecting basin fire impact area analysis interface;

FIGS. 19 to 9 are the heavy-box yard 4# sump gas cloud diffusion influence range analysis interfaces;

FIGS. 19-10 are views of the heavy-box yard 5# sump air cloud diffusion influence range analysis interface;

reference numbers in the figures:

1. a front platform; 11. mooring a ship pier; 12. mooring a ship pier; 13. a filling platform; 131. a hose crane; 132. a measuring pry; 14. a tank deck; 141. filling and prying; 1411. a filling pump; 1412. a pressurized gasifier; 142. an LNG tank; 143. a heater; 15. a filling area liquid collecting tank;

2. a rear tank yard; 21. an empty box yard; 22. a heavy box yard; 23. a storage yard liquid collecting pool; 24. protecting the enclosing wall; 25. an endless transport road;

3. an injected vessel.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1, an LNG refueling system includes a front platform 1 and a rear tank yard 2, the front platform 1 is disposed in a stacking area, the rear tank yard 2 is disposed behind the stacking area, and the rear tank yard 2 is connected to the front platform 1 through a road and can be circularly transported by a transport vehicle.

As shown in fig. 2, the front platform 1 includes a dolphin 11, three dolphins 12, a filling platform 13, and a tank platform 14, wherein the

dolphins

11 and 12, and the filling platform 13 and the tank platform 14 are arranged in sequence, and are connected with each other through a connecting segment. The mooring piers 11, the three mooring piers 12 and the filling platform 13 are arranged on a shoreline, and the tank platform 14 is arranged behind the shoreline.

Fig. 2, in conjunction with fig. 4, shows the filling platform 13 with the hose crane 131, the metering pry 132, for connecting the filling party with the vessel 15 to be filled, fig. 1, in conjunction with fig. 3, shows the tank platform 14 with a plurality of LNG tanks 142 at their settling points, the filling pry 141; a plurality of LNG tank tanks 142 are transported by the vehicle from the rear to the site, the plurality of LNG tank tanks 142 are each connected to a filling skid 141, and the filling skid 141 is connected to a metering skid 132.

The filling platform 13 is in an upright pier structure, the length of a shoreline occupied by the whole wharf is 133m, the dolphin 11 and the dolphin 12 are in upright pier structures, the size of the dolphin 11 is 8m multiplied by 8m, the size of the dolphin 12 is 10m multiplied by 10m, the size of the filling platform 13 is 15 multiplied by 10m, and the size of the tank platform 14 is 51 multiplied by 18.5 m. The mooring pier 11, the mooring pier 12 and the filling platform 13 are sequentially arranged, the tank platform 14 is located behind the filling platform 13, the filling platform 13 is connected with the tank platform 14 through a connecting section, and the connecting section is 9m in length and 5m in width. The filling wharf is suitable for 500-5000 ton inland river motor ships.

In this embodiment, there are three LNG tanks 142, the volume of LNG in each LNG tank 142 is 40m3, the total volume of LNG is 120m3(31680 gallons), and the distance between the three LNG tanks 142 is 1.5 m.

As shown in fig. 9, the filling skid 141 includes two filling pumps 1411 and a pressure boost vaporizer 1412, the two filling pumps 1411 may be configured as a main filling pump and an auxiliary filling pump, and may alternately operate, liquid phase ports of the three LNG tank tanks 142 are connected to the two filling pumps 1411, outlets of the filling pumps 1411 are connected to the metering skid 132, liquid phase pressure boost ports of the three LNG tank 142 are connected to the pressure boost vaporizer 1412, and a vaporization outlet of the pressure boost vaporizer 1412 returns to the LNG tank 142 through a gas phase port of the LNG tank 142.

Referring to fig. 10, the three LNG tanks 142 are arranged in the same manner, and the bottom of the LNG tank 142 has three outlets, which are a liquid phase port, a gas phase port, and a liquid phase pressurization port from left to right; the liquid phase port is connected with both the two filling pumps 1411, and the liquid phase pressurization port is connected with the pressurization vaporizer 1412, and is used for returning a gas phase generated after partial liquid phase pressurization and vaporization to the LNG tank 142 through the gas phase port, so as to increase the pressure of LNG in the LNG tank 142; and the gas phase port is also connected with a gas phase return line of the injected ship.

As shown in fig. 11, the metering pry 132 has an LNG liquid phase feeding pipe and an LNG gas phase returning pipe inside, a metering valve body, and a BOG purge line.

As shown in fig. 12, the BOG dispersion system is mainly an EAG heater 143, wherein a plurality of interfaces are provided on the inner pipe of the metering pry 132, the inner pipe of the filling pry 141, and the pipe between the metering pry 132 and the filling pry 141, the interfaces are connected with an inlet of the heater 143, and an outlet of the heater 143 is a dispersion port for dispersing BOG into air.

In this embodiment the filling zone sump 15 is 3m 2m 1m, and is shown as being located at the lower left of the tank platform 14, at a distance of 38m from the LNG tank 14215m and from the vessel 3 being filled.

As shown in fig. 1 and fig. 5, the rear tank yard 2 includes an empty tank yard 21, a heavy tank yard 22, a yard sump 23, and a protective enclosure 24; the empty box yard 21 and the heavy box yard 22 are distributed adjacently at intervals, annular transportation roads 25 are arranged outside the empty box yard 21 and the heavy box yard 22, and a road is shared by the adjacent positions of the empty box yard 21 and the heavy box yard 22;

referring to fig. 6, a protective enclosure 24 is provided around the empty box yard 21, at least one outlet and at least one inlet are provided on the protective enclosure 24, a 4# entrance is provided on the left side, a 3# entrance is provided on the opposite side for entrance and exit, a 4# entrance is provided for heavy box exit, a 3# entrance is provided for heavy box entrance, and the distance from the tank is greater than 20m, empty box positions are arranged in a matrix in the empty box yard 21, empty tank positions are arranged on the empty box positions, every 10 tank positions are grouped on the empty box yard 21, each row comprises 24 groups of tank positions, vehicle passages of 15m are provided between adjacent rows, 3m are provided between adjacent rows, vehicle roads of greater than 20m are provided between the tank and the protective enclosure 24, the empty box yard 21 has 3 rows of tank positions, 120 empty box positions are provided in total, the empty box yard is provided with 4 liquid guide channels, and adjacent liquid guide channels converge into the same yard liquid collecting tank 23, two yard liquid collecting tanks 23 are arranged in the empty box yard 21;

referring to fig. 7, the heavy tank yard 22 has a protective enclosure 24 around it, the protective enclosure 24 has at least one inlet and at least one outlet, the left side is a # 2 entrance, the opposite side is a # 1 entrance for entrance and exit, the # 2 entrance is used for the heavy tank exit, the # 1 entrance is used for the heavy tank entrance, and the distance from the entrance to the tank is greater than 20m, the heavy tank yard 22 has heavy tank sites arranged in a matrix, the heavy tank sites are filled with LNG, the heavy tank yard 21 has a group of 10 tanks, each row includes 6 groups of tanks, vehicle channels 15m are formed between adjacent rows, vehicle channels 3m are formed between adjacent columns, vehicle channels greater than 20m are formed between the tanks and the protective enclosure 24, the heavy tank yard 22 has 3 rows of tanks, and 180 heavy tank sites in total, the heavy tank yard 22 has 6 liquid guide trenches, and the adjacent liquid guide trenches are merged into the same liquid collecting tank 3, three storage yard liquid collecting tanks 23 are arranged in the heavy box storage yard 22;

each group of the empty tank yard 21 and the heavy tank yard 22 is arranged in a 2 x 5 manner, the distance between two columns in each group of the tanks is 3m, and the distance between adjacent rows is 1 m. Empty bin and heavy bin are 40 feet of bins, 40 feet of container size: external dimensions are long: 12192mm wide: 3438mm high: 2591 mm.

The size of the yard sumps 23 is 4 m.

Combustible gas/low temperature detection facilities are required to be arranged in the tank farm, and the parallel lock starts high-power foam and acousto-optic alarm.

The working process of the embodiment is as follows:

the three LNG tanks 142 are transported from the heavy tank yard 22 to the tank platform 14 by container trucks, the LNG tanks are placed at tank placement points, the container trucks return to a standby point, the hose crane 131 is operated to connect the metering pry 132 with the ship 3 to be filled, the LNG filling is performed by connecting metal hoses to the ship 3 to be filled, the three LNG tanks 142 are connected with the pry 141 by using dedicated metal pipe connectors, the liquid phase pressurizing port of the LNG tank 142 enters the pressure-increasing vaporizer 1412, the pressurized and vaporized LNG tanks 142 enter the LNG tank 142 through the gas phase port of the LNG tank 142, the liquid phase ports of the three LNG tanks 142 enter the liquid phase pipe of the metering pry 132 after entering the filling pry 141, the liquid phase pipe enters the liquid phase inlet of the ship 3 to be filled, the BOG generated by the ship 3 to be filled returns to the gas phase return pipe of the metering pry 132, the filling pry 141 enters the three LNG tanks 142 through the gas phase port of the LNG tank 142, and the filling is completed, informing the standby container trucks to return to the tank platform 14, and transporting the empty LNG tank 142 to the empty tank yard 21 by the container trucks or transporting the empty LNG tank to an LNG tank (tanker) filling area to fill the empty LNG tank in time;

BOG treatment process in the filling process:

generating a BOG flow: the BOG generated in the LNG tank of the ship 3 to be filled enters a BOG integrated pipeline (LNG gas phase return line) through a dedicated BOG pipeline in the filling skid 141 and a stainless steel metal hose and the metering skid 132, and finally enters the LNG tank.

BOG evaporation gas treatment process of filling system overpressure diffusion: part of the BOG generated in the filling process enters the LNG tank 142, and due to high ambient temperature or too long time for placing the LNG tank at a dock, the BOG vapor in the tank is released safely through an overpressure release valve arranged in the tank, a heater 143 and a release pipe through a pipeline.

When the empty tank is transported back to the LNG tank filling station for LNG filling, the BOG in the tank is returned to the LNG large-scale storage tank of the receiving station or is pressurized and output by the BOG evaporated gas high-low pressure conveying system through the BOG evaporated gas pipeline of the LNG receiving station through the gas return arm BOG evaporated gas pipeline.

After LNG filling is finished, the LNG filling device is connected with pipelines in the filling pry 141 and the metering pry 132 through the nitrogen purging system, after the LNG filling is finished, nitrogen is blown into the pipelines in the filling pry 141 and the metering pry 132, more specifically, the pipelines in the filling pry 141 and the metering pry 132 are connected with a nitrogen bottle, corresponding valves are arranged on the connecting pipelines, and residual gas liquid is directly blown to a diffusing port through the nitrogen purging system to be diffused, so that accidents are avoided.

In this embodiment, the LNG pipeline has a short distance and good cold insulation performance, so that no circulation cold insulation is required.

In this embodiment, the heat insulation measure is that the LNG process pipeline is a vacuum heat insulation pipe, and the cold insulation material of the LNG tank 142 is vacuum powder. The valves and the like are all cooled by high-density polyisocyanurate.

Electrical measures are as follows: in the explosive environment dangerous area, the electrical equipment adopts explosion-proof products. A human body static eliminating device is arranged at an entrance of a wharf, an entrance of an explosion dangerous place and the like.

The control system comprises: the alarm of various alarm systems is provided with a combustible gas alarm, a low-temperature detection alarm system and a flame detection alarm system, and the alarms of the alarm systems have the sound-light alarm function.

Water supply and drainage measures: the wharf surface is provided with a drainage ditch for rainwater collection and drainage.

Fire-fighting measures are as follows: the front edge of the filling area is provided with a water curtain, a fire-fighting gun tower and a liquid collecting tank, and is provided with a high-multiple foam generator.

Heating ventilation and power: filling nitrogen in the berth, supplying the nitrogen by nitrogen busbars at a wharf platform, and totally arranging 2 groups of busbars, wherein each group of busbars comprises 20 nitrogen bottles with the volume of 40L, and the working pressure of the nitrogen bottles is 15 MPa.

And (3) environmental protection measures: after the platform is provided with the sewage receiving device for temporary storage, the sewage is pumped into a rear land area for treatment, domestic sewage is connected into a municipal sewage pipe network, and oily sewage enters an oily sewage treatment station.

This embodiment is through combining the removal LNG tank case arrangement form for fixed platform with LNG filling system is leading: the length of a conveying pipeline of the LNG filling system is shortened; the invalid loss amount of LNG is reduced; a cold insulation circulating pipeline system of an LNG filling system is cancelled; the production amount of BOG is reduced; and the engineering investment is reduced.

Example two:

in the embodiment, on the basis of the first embodiment, the distance between the tank platform 14 and the injected ship 13 is 13-18 m.

In the present embodiment, through simulation of a typical jet fire event at the filling berth, the maximum influence range of the heat radiation of 15Kw/m2 is 12.38m, and the simulation shows that the influence of the outlet of the middle tank among the three tanks is the largest, so the shortest straight distance between the tank platform 14 and the ship to be filled is 12.38m, so the whole process facility on the tank platform 14 is suggested to be deviated away from the shore line, the inland river motor ship is out of the heat radiation influence range of 15Kw/m2, so the minimum distance is 12.38m, if too far, the forward position is not reached, and therefore, the distance between the tank platform 14 and the filling platform 13 is preferably 13-18m in the present embodiment.

Example three:

as shown in fig. 8, in addition to the first embodiment, an office area (lower side in fig. 8) is provided on one side of the empty box yard 21, the office area includes a dormitory building, a complex building, an office building, a main control room, and the like, and the distance from the empty box yard 21 is not less than 65 m.

The storage yard liquid collecting pool 23 of the empty box storage yard 21 and the storage yard liquid collecting pool 23 of the heavy box storage yard 22 are both arranged on one side far away from an office area, and the distance between the storage yard liquid collecting pool 23 and the office area is not less than 81 m.

Heavy case store yard 22 (the below in figure 8) one side sets up mobile machinery storehouse, emergency equipment storehouse, tank wagon loading district, the vehicle is examined and is waited the district, and is same one side with the office area, heavy case store yard 22 is all not less than 30m with mobile machinery storehouse, emergency equipment storehouse distance.

In the embodiment, the distance between the LNG liquid collecting tank and office areas such as dormitory buildings, comprehensive buildings, office buildings and main control rooms is determined to be not less than 81m through quantitative analysis of thermal radiation and vapor cloud diffusion boundaries, the LNG liquid collecting tank is arranged on one side of the tank yard far away from the office areas, the distance between corresponding building and the tank yard is effectively shortened, and conditions are provided for realizing function requirements in a purchase area;

according to the quantitative analysis report of the thermal radiation and the vapor cloud diffusion boundary, the distances from the LNG tank to a dormitory building, a comprehensive building and an office building are determined through research, the distances from the LNG tank to a mobile machinery warehouse and an emergency equipment warehouse are not less than 30m, the distances from a entrance to a guard (entrance to an exit) are not less than 20m, and the utilization efficiency of the purchased land parcel is effectively improved on the premise of ensuring the efficient stacking scale and safety.

First, comparison with the existing (mentioned in the background art) three filling modes:

(1) compared with a ship-to-ship filling mode, because the filled ship serves as a water transport vehicle, the risk faces to natural factors such as stormy wind, rainstorm, lightning stroke and the like which cannot be resisted, self factors such as failure of ship instruments and equipment and body failure can also occur, personal factors such as pirate ship hijacking and shipman misoperation under sudden accidents can also occur, and the filled ship serves as a novel LNG ship with high technical difficulty and also has the risks; in the embodiment, a filling ship is not adopted for filling, the risk faced on water is not considered, the main risk is the leakage of LNG and BOG, the risk types are less than those of ship-to-ship filling, and the investment cost is low;

(2) compared with a tank car-ship filling mode, the tank car-ship filling mode is only suitable for small filling and increases the risks of leakage and the like of the whole tank car due to the integration of filling equipment, and mainly tank car drivers are less in safety requirements than filling operators and higher in public safety risk than other filling modes in the transportation process; in this embodiment, the filling devices are all arranged on the platform, when filling is needed, the vehicle returns after the tank is transported to the tank platform 14 by the vehicle, and the transportation risk is low because the tank can be transported by a container truck, a van and the like under the condition that the tank meets the safety requirement, and in the second embodiment, the filling requirement of 120m3 can be met, and the filling speed is high because a plurality of tanks are filled simultaneously.

(3) Compared with a shore station-ship filling mode, the tank is transported to the filling platform from a tank yard behind because the tank platform 14 is closer to the filling platform than the shore station, so that pipelines between the tank and a ship to be filled are greatly reduced, and the length of a conveying pipeline of an LNG filling system is shortened; after the pipeline is shortened, the invalid loss amount of LNG can be reduced, and the residual nitrogen purging amount of the LNG filling system after the pipeline is arranged is only about 1/10 of that of the conventional system; the length of a conveying pipeline of the LNG filling system is greatly shortened due to the preposition of the LNG filling system, and a cold insulation circulating pipeline is shortened to 20m from 200 m-500 m of a conventional system, so that a cold insulation circulating pipeline system does not need to be constructed in a matched manner; the heat transfer area of the pipeline is reduced, so that the generation amount of BOG is reduced to about 1/10 of the conventional system, and the operation cost of the system is greatly reduced; and the engineering investment is reduced.

II, a checking process:

in the embodiment, in the creation process of the scheme, the scheme of the embodiment is obtained through multiple innovations and adjustments:

the risk is finally evaluated through risk source identification, frequency analysis, consequence analysis and risk calculation, and a final scheme is determined.

LEAK software is adopted for calculating the frequency, PHAST software is adopted for simulating the consequences, and SAFETI software is adopted for calculating the risks.

(1) Identifying a dangerous source: the nature and storage of the material is first examined in detail to identify events that are potentially hazardous to facilities and personnel, and then to identify possible consequences such as fire gusts, pool fires, explosions and vapor cloud spread. The purpose of the danger source identification is as follows: identifying all potential hazards and dangerous events which affect property, personnel and environment through event tree analysis; input conditions are provided for QRA studies.

The major hazards present in LNG projects are LNG and BOG. The consequences of an LNG fire are manifold, and leaking material may cause diffusion, boiling, evaporation, etc., if the gas diffuses into a confined space, an explosion, or a flash fire, etc., and pool fires may occur at the source of the leak. Once a leak occurs, personnel, equipment, and buildings may be affected.

In LNG refueling systems, most hazardous situations are caused by the leakage of flammable liquids or gases that may create vapor cloud dispersed fires or explosions, and the pore size of the leakage is calculated as follows:

5mm equivalent pore size, S leak, equivalent typical seals, gaskets, lines or instrumentation interface small leaks (1-5mm leak range);

10mm equivalent pore size, M1 leak, equivalent typical seal, gasket, line crack or meter interface crack (5-15mm leak range);

25mm equivalent pore size, M2 leak, equivalent typical seal, gasket, line crack or instrument interface crack (15-35mm leak range);

40mm equivalent aperture, M3 leak, equivalent typical seal, gasket, line crack or meter interface crack (35-50mm leak range);

complete rupture, FB complete rupture, equivalent to rupture of the container or complete rupture of the line (>50mm leak range).

(2) Frequency analysis:

the component counting method comprises the following steps: the purpose of the part count is to identify all sources of leakage in the analysis system; the node part count comprises parts such as equipment, containers, pipelines, valves, flanges and the like, and the sizes of the parts are recorded;

leakage frequency: the frequency calculation for each failure scenario is based on a reliable historical failure frequency database. In the simulation software, detailed statistical components and equipment failure frequency for each failure scenario are considered. The frequency calculation was performed using LEAK software. For a receiving station, LNG/NG is a non-corrosive fluid, the leakage frequency is lower compared with other industries, and the frequency of components and equipment is corrected by 0.6 on the basis of a Leak software calculation structure;

the ignition probability: in the LNG storage yard facility area, the main fixed ignition sources are peripheral plant area torches and vehicles outside the boundary area, and for the whole storage yard, the fixed ignition sources belong to the category of few ignition sources, so that the delayed ignition probability is selected to be 0.2.

(3) And (4) result analysis:

the consequences of leakage are simulated by using PHAST software, and the leakage rate, diffusion distance, flame characteristics and the like can be obtained through software simulation; mainly comprises the following steps of fire hazard analysis: injection of a fire event: according to the cumulative sum of the fire injection consequences of the dangerous events and the frequency data analysis, selecting typical credible events for analysis; (ii) a flashover event: and selecting a typical credible event according to the sum of the fire flashover accumulation of the dangerous event and the frequency data analysis.

(4) And (3) risk calculation:

including (a) personnel and ignition source distribution; (b) individual risk, i.e. the risk value at which a person is at a certain position 24 hours a day throughout the year; (c) an external safety protection distance; (d) and (4) social risks.

And (3) risk evaluation: and after calculating the risk, evaluating and giving a suggestion.

In the initial scenario (one), the tank platform 14 is placed directly on the shore line:

as shown in fig. 13, the tank platform 14 and the filling platform are both directly arranged on the shore line, and are closer to the shore line side of the inland river motor ship, so that the LNG tank 142 is closer to the ship to be filled during filling; as shown in fig. 13-1, three tanks are connected to the filling pump 1411 and the pressurization vaporizer 1412, and the heater 143 is connected to the three tanks.

And (3) analysis of the fire injection event:

7-S, 8-S, 9-S and 10-S are selected as typical credible events for the leakage flame-out event, and the consequence analysis is carried out on the node 12 gas-phase dispersion event as shown in the combined graph of FIG. 13-1:

as can be seen from the simulation, the maximum influence range of the heat radiation of 15Kw/m2 is 12.38m, the maximum influence range of the heat radiation of 8Kw/m2 is 13.38m and the maximum influence range of the heat radiation of 5Kw/m2 is 14.70m when a typical fire injection event occurs on the tank platform. The thermal radiation impact range of 5-15Kw/m2 generated by the 9-S fire injection event reaches the shore side of the inland river motor ship.

When the filling wharf is taken for gas phase dispersion operation, the maximum influence range of the heat radiation of 15Kw/m2 is 6.43m, the maximum influence range of the heat radiation of 8Kw/m2 is 8.52m and the maximum influence range of the heat radiation of 5Kw/m2 is 10.67m at the height of 10m from the ground.

The heat radiation influence range of 15Kw/m2 is limited to the inside of the tank deck 14, and the side of the inland river motorboat on the shore line may be influenced by the heat radiation of 5-8Kw/m 2.

Therefore, the method comprises the following steps: it is recommended that the process installation on the tank deck 14 as a whole be moved 4 meters away from the shore line, leaving the inland river powerboat outside the 15Kw/m2 thermal radiation impact range.

Analysis of flash events:

typical flash events were chosen as: 7-M1, 8-M1 and 9-M1 are typical credible events of leakage flashover events, and carry out consequence analysis on the gas-phase emission events of the nodes 12;

7-M1 is the filling outlet line of the tundish, 8-M1 is the filling pump and auxiliary lines, 9-M1 is the filling pump outlet to the filling manifold of the vessel under filling, and node 12 is the tank gas phase vent, at the same location as the above-described fire injection event.

When a typical fire-fighting event occurs in a filling berth, the influence range of the 7-M1 event is the largest, 50 percent of LFL influences a inland motor ship, an adjacent container wharf and a parked container ship which are parked on the berth, the influence range reaches the vicinity of the side line of a main channel, the influence distance of a gas-phase dispersion event is smaller, and the influence range is limited in the area of a tank platform 14.

During filling operation, the navigation ship in the Yangtze river channel is monitored, and other irrelevant ships are strictly prohibited from exceeding the side line of the main channel.

The method has the advantages that reasonable combustible gas detection facilities are required to be arranged for 7-M1, 8-M1 and 9-M1 events in a safety design view; once leakage occurs, the leakage diffusion accident of the combustible gas can be found in time, and an emergency shutdown measure is started.

Therefore, in the initial scheme, the tank platform 14 is directly arranged on a shore line, so that potential safety hazards exist; the tank platform 14 is then moved backwards; ultimately forming the solution in the present application.

(II) the final recipe analysis for the pre-stage in the above example is as follows:

as shown in fig. 14, the tank platform 14 is positioned behind the filling platform 13 away from the shore line, with the filling pump 1411 outlet manifold (position 9-S in fig. 8-4) being at a distance of 22m from the shore line and 12m from the filling platform 3 near the edge of the tank platform 14, such that the LNG tank 142 is at a greater distance from the vessel being filled; as shown in fig. 14-1, three tanks are connected to the filling pump 1411 and the pressurization vaporizer 1412, and the heater 143 is connected to the three tanks.

And (3) analysis of the fire injection event:

with reference to FIG. 14-1, 7-S, 8-S, 9-S, 10-S/FB, 11-S, 12-S, which are typical credible events for a leakage flaming event, are selected, and the consequences of a node 13 gas phase dispersion event are analyzed:

as shown in fig. 14-2, a jet fire event analysis interface of 7-S, 7-S a filling outlet line of the tundish tank, as shown in fig. 14-3, the jet fire event analysis interface is 8-S, 8-S is the charge pump and accessory lines, as shown in fig. 14-4, a jet fire event analysis interface of 9-S, a metering pry and accessory line of 9-S, as shown in fig. 14-5, the injection fire event analysis interface is 10-S/FB, the booster gasifier and accompanying lines are 10-S/FB, as shown in fig. 14-6, 11-S is the charge gas phase line, as shown in fig. 14-7, 12-S is the metered gas phase line, 14-8, which is the jet fire event analysis interface for node 13, node 13 is the refueling tank vapor phase vent.

As can be seen from the simulation results, in the case of a typical fire-jet event in the dock area, the maximum influence range of the heat radiation is 10.88m for 32kW/m2, 12.38m for 15kW/m2, 13.38m for 8kW/m2 and 14.70m for 5kW/m 2. The influence range of 5-15kW/m2 heat radiation generated by the 9-S fire injection event reaches the shore line side of the inland river motor ship.

When the filling dock area is subjected to a gas phase dispersion operation, the maximum influence range of heat radiation is 6.43m for 15kW/m2, 8.52m for 8kW/m2 and 10.67m for 5kW/m2 at a height of 10m from the ground.

The 15kW/m2 heat radiation impact range is limited to the interior of the tank deck 14 and the dosing skid deck may be subjected to heat radiation impacts of 5-8kW/m 2.

Proposal 1: according to the influence range of the node 9-S heat radiation, taking fire-resistant protection measures for process equipment facilities, frame structures, base supports, pipe galleries and the like in the metering prying area, and configuring reliable water spraying, cooling and fire-fighting measures; the crane column needs to consider a fireproof coating, and the influence of a fire spraying event is met.

And (2) suggestion: the filling operation of the filling wharf is monitored in real time, the activity information of the wharf and shipside personnel in a 50% LFL area is mastered, and the ignition possibility is controlled and reduced as much as possible.

Analysis of flash events:

typical flash events were chosen as: 7-M1, 8-M1, 9-M1, 11M1/FB and 12M1/FB are typical credible events of leakage flashover events, and the consequence analysis is carried out on the node 12 gas phase emission events;

7-M1 is a filling outlet pipeline of the intermediate tank, 8-M1 is a filling pump and an auxiliary pipeline, 9-M1 is a metering pry and auxiliary pipeline, 11-M1 is a filling gas phase pipeline, 12-M1 is a metering gas phase pipeline, and a node 13 is a gas phase diffusion port of the filling tank; the same as above.

FIG. 15-1 is an analysis interface for a 7-M1 flashover event; FIG. 15-2 is an analysis interface for 8-M1 flashover events; FIG. 15-3 is an interface for analysis of a 9-M1 flash event; FIG. 15-4 is an analysis interface for 11-M1/FB flashover events; FIG. 15-5 is an analysis interface for a 12-M1/FB flash event; fig. 15-6 are interfaces for analyzing the gas phase emission events at node 12;

the simulation shows that the influence range of the 7-M1 event is the largest when a typical flash event occurs, 50% of LFL influences the inland motorized ship berthing on the berth, the adjacent container wharf and the berthed container ship to reach the vicinity of the edge line of a main channel, the influence distance of the gas phase dispersion event is smaller, and the gas phase dispersion event is limited in the area of the tank platform 14.

It is recommended from the viewpoint of safety design to put emphasis on arranging reasonable combustible gas detection facilities for 7-M1, 8-M1, 9-M1, 11M1/FB and 12M1/FB events; once leakage occurs, the leakage diffusion accident of the combustible gas can be found in time, and an emergency shutdown measure is started.

Fill area sump 15 event analysis:

the design size of the filling area liquid collecting pool 15 is 3m (W) 2m (L), the leakage amount under the largest leakage scene is considered, the space storage of 0.57m is needed, the foam covering height at the upper part of the liquid collecting pool is also considered by a design party, and the liquid collecting pool occupies a certain capacity by the facilities in the pool, and finally the height of the liquid collecting pool is confirmed to be 1 m.

FIG. 16-1 illustrates the analytical interface of the occurrence of a fire in the sump 15 of the filling zone; according to the Phast calculation result, the heat radiation range of 15-32 kW/m2 is shown in the figure, and no fixed facilities are arranged; within the influence range of 8kW/m2, building structures (such as a control room, a maintenance workshop, a laboratory, a warehouse and the like) are not arranged within the range according to design data; in the influence range of 5kW/m2, according to design data, a person concentration area such as an administrative building is not arranged in the influence range, no activity place with more than 50 persons exists in the influence range of 4kW/m2, and no fireproof structure exists in the influence range of 30kW/m2, so that the requirement of a heat radiation threshold value is met. The distance of the filling area sump 15 is thus relatively safe.

As shown in fig. 16-2, a filling area liquid pool gas cloud diffusion diagram; according to the Phast calculation result, under the 2F gas phase working condition, the influence range of 50% LFL is 53.01m, and the inland river motor ship which is parked on the berth from the north side beyond the boundary area to the filling wharf is close to the side line of the main channel and does not meet the requirement of the standard threshold value.

Proposal 1: based on the north side being the inner side of the Yangtze river levee, the possibility of personnel is low, the filling operation of the 5# filling wharf is monitored in real time, the activity information of the wharf and shipside personnel in a 50% LFL area is mastered, and the ignition possibility is controlled and reduced as much as possible.

Proposal 2: combustible gas/low-temperature detection facilities are arranged at the liquid collecting tank, and the parallel lock starts high-power foam and acousto-optic alarm. Once liquid is accumulated in the liquid collecting pool, the system can alarm and warn personnel inside and outside the station yard in time, and can start an emergency plan in time and evacuate.

The analysis is only typical event analysis performed by typical credible events, and in the actual analysis process, analysis conditions are added or adjusted according to different sites.

(III) carrying out the analysis of the fire injection event for the rear tank yard in the above embodiment:

selecting nodes 1-S and 2-S as typical credible events for leakage fire spraying events aiming at a heavy tank field area (a group of 10 tank boxes), and carrying out consequence analysis;

selecting nodes 3-S and 4-S as typical credible events for leakage fire spraying events aiming at an empty tank yard area (a group of 10 tank boxes), and carrying out consequence analysis;

carrying out consequence analysis on the PSV (PSV refers to a pressure safety valve) discharge events of the tank boxes at the

nodes

5 and 6; the node 5 is a PSV of the LNG tank in the heavy tank yard; the node 6 is an empty tank yard LNG tank PSV;

as shown in fig. 17-1, a jet fire event analysis interface of 1-S, showing that 1-S is the range of thermal radiation generated by liquid phase leakage from LNG tanks in a heavy tank yard, which is a group of tanks near the 2# concierge; as shown in fig. 17-2, which is a 2-S jet fire event analysis interface, showing that 2-S is the range of thermal radiation generated by gas phase leakage of LNG tanks in a heavy tank yard, which is a group of tanks near a # 2 entrance guard; as shown in fig. 17-3, a jet fire event analysis interface of 3-S, showing that 3-S is the range of thermal radiation generated by liquid phase leakage of LNG tanks in an empty tank yard, the group of tanks being a group of tanks near an office area; as shown in fig. 17-4, a 4-S jet fire event analysis interface, showing the thermal radiation range of 4-S generated by the gas phase leakage of the LNG tanks in the empty tank yard, the group of tanks being a group of tanks near the office area; as shown in fig. 17-5, a jet fire event analysis interface for node 5, showing the thermal radiation range generated by node 5-PSV-1, ground level; as shown in fig. 17-6, a jet fire event analysis interface for node 5, showing the thermal radiation range generated by node 5-PSV-2, ground level; as shown in fig. 17-7, the jet fire event analysis interface for node 6 shows the thermal radiation range generated by node 6-PSV-1, ground level; as shown in fig. 17-8, a jet fire event analysis interface for node 6, showing the thermal radiation range generated by node 6-PSV-2, ground level; 17-9, which is a jet fire event analysis interface for node 5, showing the range of thermal radiation generated at node 5-PSV-1, 2.5m height; 17-10, which is a jet fire event analysis interface for node 5, showing the range of thermal radiation generated for node 5-PSV-2, 2.5m height; 17-11, which is a jet fire event analysis interface for node 6, showing the range of thermal radiation generated at node 6-PSV-1, 2.5m height; 17-12, which are jet fire event analysis interfaces for node 6, showing the range of thermal radiation generated for node 6-PSV-2, 2.5m height;

the nodes 5-PSV-1 and 5-PSV-2 are two different PSVs selected by the node 5 (in the double-box tank box); the nodes 6-PSV-1 and 6-PSV-2 are two different PSVs selected by the node 6 (in the empty tank box);

from the above simulation results, it can be seen that in the case of a typical liquid phase leakage jet fire event for each tank group, the maximum range of influence of the heat radiation is 5.81m for 32kW/m2, 6.54m for 15kW/m2, 7.04m for 8kW/m2 and 7.69m for 5kW/m 2. The thermal radiation influence range is limited in each group of tank boxes, and no obvious thermal radiation influence is caused on adjacent tank box groups.

When each group of tank boxes generate gas phase leakage, the maximum influence range of the heat radiation of 5-32 kW/m2 is 2.31 m. Limited in the range of the tank group, certain influence may be generated on foundation facilities in the group, influence is generated on adjacent tank metal structures and outer surfaces of storage tanks in the group, and even the tank structures are damaged, but the influence does not exceed the range of the tank group.

When the tank PSV was vented at overpressure, the maximum impact of 32kW/m2 was 15.27m, the maximum impact of 15kW/m2 was 16.73m, the maximum impact of 8kW/m2 was 18.26m and the maximum impact of 5kW/m2 was 19.46 m. The thermal radiation effect of 5kW/m2 is not present in an administrative building; building structures such as control rooms, maintenance workshops and laboratories do not exist in the heat radiation influence range of 8kW/m 2; the heat radiation of 32kW/m2 and 15kW/m2 has a limited effect on adjacent tank groups, the arrangement between tank groups meeting the heat radiation threshold requirement.

Flash events were analyzed for the rear tank yard in the above embodiment:

for a heavy tank yard area (group of 10 tanks): selecting the node 1-M2 and 2-M2 leakage flashover events as typical credible events, and carrying out consequence analysis;

for an empty tank yard area (a group of 10 tanks): selecting the node 3-M2 and 4-M2 leakage flashover events as typical credible events, and carrying out consequence analysis;

carrying out consequence analysis on PSV (tank safety hazard) release events of the

nodes

5 and 6;

as shown in fig. 18-1, which is a 1-M jet fire event analysis interface, and 1-M is the impact range of flash fire events caused by liquid phase leakage of LNG tanks in a heavy tank yard, the group of tanks is a group of tanks near a # 2 entrance;

as shown in fig. 18-2, which is a 2-M jet fire event analysis interface, 2-M is the impact range of flash fire events caused by liquid phase leakage of LNG tanks in a heavy tank yard, and the group of tanks is a group of tanks near the 2# entrance;

as shown in fig. 18-3, which is a 3-M jet fire event analysis interface, and 3-M is the flash fire event impact range generated by the liquid phase leakage of the LNG tanks in the heavy tank yard, which is a group of tanks near the 2# concierge;

as shown in fig. 18-4, which is a 4-M jet fire event analysis interface, 4-M is the flash fire event impact range due to liquid phase leakage from LNG tanks in a heavy tank yard, which is a group of tanks near the 2# concierge;

as shown in fig. 18-5, a flash event analysis interface for node 5 is shown, showing the impact range of flash caused by node 5, PSV leakage;

as shown in fig. 18-6, a flash event analysis interface for node 6 is shown, showing the impact range of flash caused by node 6, PSV leakage;

from the simulation results, the influence range is large when the liquid phase leaks when a typical credible flash-fire event occurs in the tank box set. When a typical 1-M2 fire hazard occurs in a tank yard, the 50% LFL encompasses most of the west side of the yard where there are manned structures such as heavy tank yards # 1 and # 2, empty tank yards # 3 and # 4, complex logistics, administrative office, central control room, main and loading control rooms, etc.

When a PSV discharge event occurs, the range of diffusion of the flammable gas cloud is small, the maximum diffusion distance is about 18.5m, and 50% of LFL is confined inside the yard but affects the yard guard room.

Proposal 1: the valve box is provided with reasonable measures to lead the leaked liquid into the liquid drainage channel, so that the influence range of liquid leakage and diffusion can be obviously reduced.

And (2) suggestion: combustible gas detection is arranged in manned regions (such as a tank yard entrance guard, a comprehensive logistics building, an administrative office building, a central control room, a main entrance guard and a loading control room), once the combustible gas exceeds the standard, the combustible gas can be timely found and evacuated, and the accident consequence is reduced.

Suggestion 3: from the perspective of safety design, based on 1-M2 and 3-M2 events, reasonable combustible gas detection facilities are arranged in a tank yard, combustible gas leakage and diffusion accidents are found in time, and an emergency plan is started.

The consequence analysis is carried out on pool fire and gas cloud diffusion of the liquid collecting pool according to the scheme in the embodiment:

consequence analysis is carried out on gas cloud diffusion of the collecting tanks of the tank yard of the nodes 14-1, 14-2, 14-3, 15-1 and 15-2, and as shown in the figure 1, the nodes 14-1, 14-2 and 14-3 are three collecting tanks of 1#, 2# and 3# in sequence from right to left of the heavy tank yard, and the nodes 15-1 and 15-2 are two collecting tanks of 4# and 5# in sequence from right to left of the empty tank yard.

Considering that a single LNG heavy tank can generate 17500kgLNG leakage, and the volume of the tank is about 37m ³ 。

The dimensions of the designed 1#, 2# and 3# sumps are 4m (w) 4m (l). Considering the leakage amount in the largest leakage scene, 2.32m of space is needed for storing LNG, and considering the foam covering height at the upper part of the liquid collecting tank and a certain volume occupied by the facilities in the liquid collecting tank, the size of the liquid collecting tank is 4m (W) 4m (L) 4m (h);

FIG. 19-1 heavy box yard # 1 catch basin fire impact range; FIG. 19-2 heavy-box yard # 2 sump fire impact range; FIG. 19-3 heavy box yard # 3 sump fire impact range;

according to the calculation result of Phast, the figure shows that 15-32 kW/m ² Within the heat radiation range of (a), without any fixed facilities; 8kW/m ² In the influence range, building structures (such as control rooms, maintenance workshops, laboratories, warehouses, etc.) are not arranged in the range according to the design information; 5kW/m ² In the influence range of (2), according to the design data, no person concentration area such as an administrative building is set in the range; 4kW/m ² No activity place of more than 50 people exists within the influence range of (1); 9kW/m ² Has no influence onReuse buildings for activity places, schools, hospitals, prisons, detention places, residential areas and the like; 30kW/m ² The influence range of the heat radiation is free of any fireproof structures, and the requirement of the heat radiation threshold is met.

The gas cloud diffusion ranges of the liquid collecting pools of the heavy box storage yards 1#, 2# and 3# are shown in a table 3-1, and the maximum gas cloud diffusion ranges in the downwind direction are shown in a graph of 19-4, 7-5 and 7-6.

TABLE 3-1 heavy-box yard 1#, 2# and 3# sumps air cloud diffusion influence distance

LFL refers to the lower limit of ignition, UFL refers to the upper limit of ignition.

Fig. 19-4 is a heavy tank yard # 1 liquid collecting pool gas cloud diffusion influence range, fig. 19-5 is a heavy tank yard # 2 liquid collecting pool gas cloud diffusion influence range, and fig. 19-6 is a heavy tank yard # 3 liquid collecting pool gas cloud diffusion influence range;

according to the Phast calculation result, under the 2F gas phase working condition, the 50% LFL influence range is 80.05m, and the requirement of the specification is met without exceeding a factory boundary area. The heavy box yard # 1 entrance guard, the 2# entrance guard and the empty box yard # 3 entrance guard are not within the 50% LFL influence range.

② empty case storage yard 4# and 5# collecting tanks

Considering that a single empty LNG tank may generate 500kgLNG leakage, the volume is about 1.05m ³ 。

The dimensions of the designed yard sumps are 4m (w) 4m (l). Considering the leakage amount in the largest leakage scene, the required space of 0.07m for storing LNG, additionally considering the foam covering height at the upper part of the liquid collecting pool and a certain capacity occupied by the facilities in the pool, and setting the sizes of the liquid collecting pool of the yard to be 4m (W) 4m (L) 4m (h) for the uniformity of construction;

FIG. 19-7 illustrates the impact range of the empty box yard No. 4 collecting pool fire; FIG. 19-8 illustrates the impact range of the empty box yard No. 5 collecting pool fire;

according to the calculation result of Phast, the 15-32 kW/m can be seen from the figure ² Within the heat radiation range of (a), without any fixed facilities; 8kW/m ² Influence of (2)In the range, no building structures (such as control rooms, maintenance plants, laboratories, warehouses, etc.) are arranged in the range; 5kW/m ² Within the influence range of (1), no person concentration area such as an administrative building is arranged within the range, 4kW/m ² No activity place of more than 50 people within the influence range of (2), 30kW/m ² The influence range of (2) is free of any fireproof structures, and the requirement of a thermal radiation threshold is met.

The air box storage yard 4# and the liquid collecting pool 5# have air cloud diffusion ranges shown in the table 3-2, and the most atmospheric cloud diffusion range in the downwind direction is shown in the figures 19-9 and 7-10.

TABLE 3-2 influence distance of air cloud diffusion in empty box storage yard 4# and 5# collecting tanks

The air cloud diffusion influence range of the empty box yard No. 4 collecting pool in FIGS. 19-9; FIGS. 19-10 empty box yard # 5 sump gas cloud spread impact range;

according to the Phast calculation result, under the 2F gas phase working condition, the 50% LFL influence range is 64.62m, and the requirement of the specification is met without exceeding a factory boundary area. The empty bin yard # 3 concierge, the # 4 concierge, and the heavy bin yard # 2 concierge are not within 50% of the LFL impact range.

And (3) risk calculation:

(1) the distribution of personnel and ignition sources, and the distribution of personnel and ignition sources is analyzed to obtain the ignition probability of 0.04; the filling operation of the filling wharf needs to be monitored in real time, the activity information of wharf and ship side personnel in a 50% LFL area is mastered, and the ignition possibility is controlled and reduced as much as possible;

(2) the method comprises the steps that a split risk contour line of a rear tank yard field area and a filling platform area is found to be in a range of 1.0E-3 and a highest risk area through simulation; combustible gas/low-temperature detection facilities need to be arranged, high-power foam and acousto-optic alarm are started through parallel locks, the design load of a heavy box storage yard is 10 ten thousand tons per year of operation capacity of the storage yard, the capacity utilization rate is 50%, and the threshold requirement can be met;

(3) risk analysis is carried out on facilities and places outside the station, the risk is ensured to be lower than 1.0E-09, and the requirement that the regulatory requirement is lower than the standard value of 3.0E-06 is met;

(4) the social risk curve of the filling platform to surrounding personnel is in a curve acceptable area specified by the state, and the requirements of the regulations are met.

And (3) risk evaluation:

according to the jet fire analysis, the flash fire analysis, the liquid collecting tank analysis and the risk analysis, the current scheme can ensure that the risk and the safety distance meet the requirements of regulations.

The innovation point of the scheme is that:

1. the LNG filling system is arranged in front; the problems that the conventional shore-based storage station fills the LNG power ship through a filling pipeline system, and the filling system is large in scale and long in pipeline length are solved; the LNG filling system wharf is arranged in front, the scale small pipeline of the filling system is shortened, the filling form is high in innovation and obvious in benefit, and the LNG filling system wharf has the following advantages:

(a) shorten LNG filling system transfer line length: the front-mounted shore-based LNG filling system greatly shortens the length of a conveying pipeline of the LNG filling system and reduces the difficulty that the pipeline of the system is too long for a river levee.

(b) Reducing the amount of ineffective loss of LNG: according to the specification of design Specifications (trial implementation) of inland river liquefied natural gas filling terminals (JTS196-11-2016), the net filling time (h) of one ship is 0.5-1 h, the time (h) of the ship to be filled for stopping from the filling berth is 0.6-1 h, the average time for single filling is about 1.1-2 h, and the filling interval time of the filling system is long. The pipeline system residual liquid after filling is wasted due to the fact that nitrogen is needed to be used for blowing. The residual nitrogen purge of the pre-LNG refueling system is only about 1/10 compared to conventional systems,

(c) the cold insulation circulating pipeline system of the LNG filling system is cancelled: because the length of the conveying pipeline of the LNG filling system is greatly shortened by the preposition of the LNG filling system, the length of the cooling-insulation circulating pipeline is shortened to 20m from 200 m-500 m of the conventional system, and a cooling-insulation circulating pipeline system does not need to be constructed in a matching way.

(d) The production amount of BOG is reduced: because the length of the conveying pipeline of the LNG filling system is greatly shortened by the preposition of the LNG filling system, the heat transfer area of the pipeline is reduced, the BOG generation amount is reduced to about 1/10 of the conventional system, and the operation cost of the system is greatly reduced.

(e) And (3) reducing the engineering investment: because the front of the LNG filling system greatly shortens the length of a conveying pipeline of the LNG filling system, and simultaneously reduces the cold insulation engineering quantity of the LNG filling system, the engineering investment is reduced.

2. Through multiple improvements, the minimum safe distance between the LNG power motor ship and the LNG tank of the front filling system is determined

In order to ensure the safety of the LNG filling system and the LNG power-driven ship in the static and operation processes, the minimum safety distance between the LNG power-driven motor ship and the LNG tank box of the front filling system needs to be defined.

To achieve the above objective, by quantitatively analyzing the minimum distance between the inland LNG powered mobile vessel and the preceding filling system LNG tank, it is clear that:

(a) 15Kw/m when a typical fire injection event occurs during filling of a berth ² The maximum influence range of the heat radiation is 12.38 m; in gas phase dispersion operation, 15Kw/m ² The maximum influence range of the heat radiation is 6.43 m; it is proposed that the whole process facility on the tank platform is shifted away from the shore line and kept at a proper distance of 15m, so that the inland river motor ship is at 15Kw/m ² Outside the thermal radiation influence range;

(b) when a typical fire-flashover event occurs when the berth is filled, monitoring sailing ships in the Yangtze river channel, strictly forbidding other unrelated ships to exceed the side line of the main channel, and simultaneously arranging reasonable combustible gas detection facilities; once leakage occurs, the leakage diffusion accident of the combustible gas can be found in time, and an emergency shutdown measure is started.

(c) At present, the distance between the arrangement position of the LNG filling equipment and the LNG power ship has no determined specification and regulation, and the LNG filling system with the front platform in the embodiment provides a new filling form, and powerfully promotes the construction of LNG filling technology in the industry.

3. The distance between the buildings around the rear land LNG tank yard is determined through design and inspection:

(a) and determining that the distance between the LNG tank and a dormitory building, a comprehensive building or an office building is not less than 65m, the distance between the LNG tank and a mobile machinery warehouse or an emergency equipment warehouse is not less than 30m, and the distance between the LNG tank and a entrance guard is not less than 20 m.

(b) The distance between the liquid collecting pool and a dormitory building, a comprehensive building, an office building and a main control room is determined to be not less than 81m through research, and a combustible gas detection facility is additionally arranged in the influence range of vapor cloud diffusion of the liquid collecting pool, so that once combustible gas leakage is detected, the combustible gas leakage can be timely found and an emergency response can be made.

So that the safety requirements can be met.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An LNG filling system is suitable for a 500-ton and 5000-ton inland river mobile ship and comprises a preposed platform, wherein the preposed platform comprises a filling platform which is arranged on a shoreline, and the LNG filling system is characterized by further comprising a rear tank yard, the filling platform and the rear tank yard are arranged nearby, the preposed platform further comprises a tank platform, the tank platform is arranged at the rear position on the shoreline, the filling platform is connected with the tank platform through a connecting section, the distance between the tank platform and a ship to be filled is 13-18m, a hose crane and a metering pry for connecting a filling party and the ship are arranged on the filling platform, and the tank platform is provided with a plurality of placing points and filling prys for movable LNG tanks; the LNG tank boxes are connected with the filling pry, and the filling pry is connected with the metering pry;

the rear tank yard comprises an empty tank yard, a heavy tank yard and a yard liquid collecting pool, wherein protective enclosing walls are arranged on the peripheries of the empty tank yard and the heavy tank yard, at least one outlet and at least one inlet are arranged on the protective enclosing walls, the empty tank yard and the heavy tank yard are distributed at intervals, and annular transportation roads are arranged outside the empty tank yard and the heavy tank yard; empty tank positions arranged in a matrix form are arranged in the empty tank yard, empty LNG tank boxes are placed on the empty tank positions, a liquid guide channel is arranged on the side surface of each row or each emptying tank position, and a plurality of liquid guide channels are converged into a yard liquid collecting pool; the heavy tank yard is internally provided with heavy tank positions which are arranged in a matrix manner, the LNG tank filled with LNG is positioned at the heavy tank positions, the side surface of each row or each row of heavy tank positions is provided with a liquid guide channel, and a plurality of liquid guide channels are converged into the yard liquid collecting pool;

the rear tank yard is located behind the shoreline and is connected with a tank platform arranged on the shoreline through a road, and the LNG tank is transported between the tank platform and the rear tank yard by a vehicle.

2. The LNG filling system of claim 1, further comprising a plurality of dolphins, wherein the dolphins include at least one dolphin, the dolphins and dolphins being arranged in series with each other, and the filling platform, and the tank platform is arranged behind the filling platform, and adjacent dolphins are connected by the connecting section.

3. The LNG filling system of claim 1, wherein the filling skid comprises a filling pump and a pressurization vaporizer, liquid phase ports of the LNG tank boxes are connected with the filling pump, an outlet of the filling pump is connected with the metering skid, liquid phase pressurization ports of the LNG tank boxes are connected with the pressurization vaporizer, and a vaporization outlet of the pressurization vaporizer returns to the LNG tank box through a gas phase port of the LNG tank box.

4. The LNG filling system of claim 1, further comprising a nitrogen purging system, wherein the nitrogen purging system is connected to both the pipeline of the filling skid and the pipeline of the metering skid, and after filling is completed, nitrogen is blown into the pipelines of the filling skid and the metering skid.

5. The LNG filling system of claim 1, further comprising a heater, wherein the metering pry inner conduit, the filling pry inner conduit, and the conduit between the metering pry and the filling pry are each provided with a plurality of interfaces, the interfaces are connected to a heater inlet, and a heater outlet is a vent for emitting BOG into the air.

6. The LNG filling system of claim 1, wherein there are three LNG tanks on the tank deck, and the volume of LNG in the tanks is 120m ³ 。

7. The LNG refueling system as recited in claim 1 wherein the empty tank yard is grouped into more than one tank, each row comprising more than one tank, the empty tank yard has at least 3 rows of tanks, the heavy tank yard is grouped into more than one tank, and the heavy tank yard has at least 3 rows of tanks.

8. An LNG refueling system as claimed in claim 1 wherein each set of tanks of said empty and heavy tank yard is arranged in 2 x 5 rows with vehicle access between adjacent rows and vehicle walkways between tanks and protective enclosure.

9. An LNG filling system according to claim 8, characterized in that the distance between two columns in each group of tanks is at least 3m and the distance between adjacent rows is at least 1 m.

10. The LNG refueling system as recited in claim 1 wherein the empty tank yard is vertically spaced from the outlet and inlet by no less than 20m and the heavy tank yard is vertically spaced from the outlet and inlet by no less than 20 m.

11. The LNG filling system of claim 1, wherein an office area is arranged on one side of the empty box yard, the office area is not less than 65m away from the empty box yard, a mobile machinery warehouse and an emergency equipment warehouse are arranged on one side of the heavy box yard, the distances between the heavy box yard and the mobile machinery warehouse and the distances between the heavy box yard and the emergency equipment warehouse are not less than 30m, the liquid collecting tanks of the empty box yard and the heavy box yard are both arranged on one side away from the office area, and the distances between the liquid collecting tanks and the office area are not less than 81 m.