KR101525728B1 - A Treatment System and Method Of Liquefied Gas - Google Patents

Abstract

The present invention relates to a liquefied gas processing system, comprising: a vapor gas supply line connecting a liquefied gas storage tank and a customer; At least one evaporative gas compressor provided on the evaporative gas supply line and compressing the evaporative gas; A liquefied gas supply line connecting the liquefied gas storage tank and the demander; A pump provided on the liquefied gas supply line for pressurizing liquefied gas in the liquefied gas storage tank and supplying the liquefied gas to the customer; An oil supply line connecting the oil storage tank and the demander; And a control unit for controlling the supply of oil to the oil storage tank by detecting the start or end of the cool-down of the pump, wherein the control unit controls the supply of oil during the cool-down period.
The present invention relates to a liquefied gas processing method, and more particularly, to a liquefied gas processing method and a liquefied gas processing system, which are capable of providing a liquefied gas storage tank with an evaporative gas processing device for supplying evaporative gas through an evaporative gas supply line, 1. A method for operating a liquefied gas processing system including a liquefied gas processing apparatus for supplying liquefied gas using a pump and an oil processing apparatus for supplying oil through an oil supply line in an oil storage tank to a customer, Supplying evaporation gas from the storage tank to the customer; Initiating a cool-down of the pump when the amount of evaporative gas generated from the liquefied gas storage tank is smaller than the evaporative gas amount required by the customer; Supplying oil from the oil storage tank to the customer; Terminating cooldown in the pump; Stopping the supply of oil from the oil storage tank to the customer; And supplying the liquefied gas from the liquefied gas storage tank to the customer.
The system and method for treating liquefied gas according to the present invention are capable of replacing the supply of liquefied gas at the time of cooldown of the high pressure pump for starting supply of the liquefied gas instead of the amount of evaporated gas generated in the liquefied gas storage tank The diesel oil is supplied to the customer, the fuel supply can be stably performed to the customer, the efficiency of the system operation is increased, and the system is prevented from being shut down.

Description

[0001] The present invention relates to a liquefied gas processing system,

The present invention relates to a liquefied gas processing system and method.

Liquefied natural gas (Liquefied natural gas), Liquefied petroleum gas (Liquefied petroleum gas) and other liquefied gas are widely used in place of gasoline or diesel in recent technology development.

Liquefied natural gas is a liquefied natural gas obtained by refining natural gas collected from a gas field. It is a colorless and transparent liquid with almost no pollutants and high calorific value. It is an excellent fuel. On the other hand, liquefied petroleum gas is a liquid fuel made by compressing gas containing propane (C3H8) and butane (C4H10), which come from oil in oil field, at room temperature. Liquefied petroleum gas, like liquefied natural gas, is colorless and odorless and is widely used as fuel for household, business, industrial, and automotive use.

Such liquefied gas is stored in a liquefied gas storage tank installed on the ground or stored in a liquefied gas storage tank provided in a ship which is a means of transporting the ocean. The liquefied natural gas is liquefied to a volume of 1/600 The liquefaction of liquefied petroleum gas has the advantage of reducing the volume of propane to 1/260 and the content of butane to 1/230, resulting in high storage efficiency.

However, since the liquefied gas is kept in a liquefied state by increasing the pressure or lowering the temperature, it is important to secure the heat insulating property of the liquefied gas storage tank because the phase change due to external heat penetration is a concern. However, since the liquefied gas storage tank can not achieve perfect heat insulation, some of the liquefied gas stored in the liquefied gas storage tank is phase-changed into vapor gas, which is a gas, by heat transmitted from the outside.

When the internal pressure of the liquefied gas storage tank exceeds the pressure that can be tolerated by the liquefied gas storage tank, the liquefied gas storage tank The tank may be damaged.

Domestic Registration Bulletin 10-1224833 (2013.01.16)

It is an object of the present invention to provide a diesel engine which is capable of supplying diesel oil to a customer at the time of cooldown of a high pressure pump, And to provide a liquefied gas processing system and method capable of preventing the deterioration of the operation efficiency of the liquefied gas.

According to an aspect of the present invention, there is provided a liquefied gas processing system comprising: an evaporation gas supply line connecting a liquefied gas storage tank and a customer; At least one evaporative gas compressor provided on the evaporative gas supply line and compressing the evaporative gas; A liquefied gas supply line connecting the liquefied gas storage tank and the demander; A pump provided on the liquefied gas supply line for pressurizing liquefied gas in the liquefied gas storage tank and supplying the liquefied gas to the customer; An oil supply line connecting the oil storage tank and the demander; And a control unit for controlling the supply of oil to the oil storage tank by detecting the start or end of the cool-down of the pump, wherein the control unit controls the supply of oil during the cool-down period.

Specifically, the apparatus may further include a heat exchanger provided on the liquefied gas supply line and performing heat exchange with the liquefied gas with the heat exchange medium.

Specifically, the control unit may further include an on-off valve that is located upstream of the point where the evaporation gas supply line and the oil supply line are connected to each other or where the evaporation gas supply line and the oil supply line are connected, .

Specifically, the control unit receives the amount of evaporative gas required by the demander from the demanding party, wirelessly receives the amount of evaporative gas generated from the liquefied gas storage tank from the liquefied gas storage tank, It is possible to receive the information of the cool-down start and end from the pump by radio and wirelessly, and to transmit the drive signal to the open / close valve by radio.

Specifically, the controller calculates an evaporation gas shortage value when the amount of evaporation gas generated in the liquefied gas storage tank is smaller than the amount of evaporation gas required in the customer, It is possible to supply the oil from the oil storage tank to the customer as much as the evaporation gas shortage value and to stop the supply of oil after the cool down of the pump.

Specifically, the on-off valve can be controlled by the control unit to regulate the supply of oil.

Specifically, the customer may be a low-pressure consumer who receives a low-pressure evaporative gas; And a high-pressure consumer supplied with a high-pressure evaporative gas, wherein the evaporative gas supply line is branched between the second and third stages of the evaporative gas compressor and connected to the low-pressure consumer, and the second- A low-pressure evaporation gas supply line for supplying pressurized evaporation gas to the low-pressure consumer; And a high-pressure evaporation gas supply line for connecting the liquefied gas storage tank to the high-pressure consumer and supplying the evaporated gas compressed at a high pressure to the high-pressure consumer by the evaporation gas compressor.

Specifically, the evaporation gas compressor may further include at least one evaporative gas cooler positioned downstream of the evaporative gas compressor and cooling the pressurized evaporative gas with a cooling medium.

Specifically, the system may further include an oil pump provided on the oil supply line and supplying the oil from the oil storage tank to the customer.

According to another aspect of the present invention, there is provided a liquefied gas processing method including: an evaporative gas processing device for supplying an evaporative gas to a customer in a liquefied gas storage tank through an evaporative gas supply line; 1. A method for operating a liquefied gas processing system comprising a liquefied gas processing unit for supplying liquefied gas using a pump through a line and an oil processing unit for supplying oil to an oil storage tank through an oil supply line as a customer, Supplying a vaporized gas from the liquefied gas storage tank to the customer; Initiating a cool-down of the pump when the amount of evaporative gas generated from the liquefied gas storage tank is smaller than the evaporative gas amount required by the customer; Supplying oil from the oil storage tank to the customer; Terminating cooldown in the pump; Stopping the supply of oil from the oil storage tank to the customer; And supplying the liquefied gas from the liquefied gas storage tank to the customer.

Specifically, the liquefied gas processing system may further include a controller for detecting the start or end of the cool-down of the pump and controlling the oil supply of the oil storage tank.

Specifically, the step of starting the cool-down of the pump may include receiving the amount of evaporative gas generated from the liquefied gas storage tank in the liquefied gas storage tank and the amount of evaporated gas required by the demander from the demander, ; The control unit calculating an evaporation gas shortage value of the customer; And the controller sending a cool down operation signal to the pump in accordance with the evaporation gas shortage value.

Specifically, the liquefied gas processing system may further include an open / close valve controlled by the control unit to regulate the supply of the oil.

Specifically, the step of supplying oil from the oil storage tank to the demanding entity may include: transmitting an open signal to the opening / closing valve when the pump starts to cool down; And a step in which the on-off valve is opened after receiving the open signal from the control unit.

Specifically, the step of stopping the supply of oil from the oil storage tank to the customer is characterized in that the control unit transmits a closing signal to the opening / closing valve when the pump cools down, And closing the on-off valve after receiving the hermetic signal from the control unit.

The system and method for treating liquefied gas according to the present invention are capable of replacing the supply of liquefied gas at the time of cooldown of the high pressure pump for starting supply of the liquefied gas instead of the amount of evaporated gas generated in the liquefied gas storage tank The diesel oil is supplied to the customer, the fuel supply can be stably performed to the customer, the efficiency of the system operation is increased, and the system is prevented from being shut down.

1 is a configuration diagram of a liquefied gas processing system according to an embodiment of the present invention.
2 is a flowchart of a liquefied gas processing method according to an embodiment of the present invention.
3 is a first partial flow diagram of a liquefied gas processing method according to an embodiment of the present invention.
4 is a second partial flow chart of the liquefied gas processing method according to an embodiment of the present invention.
5 is a third partial flow diagram of the liquefied gas processing method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram of a liquefied gas processing system according to an embodiment of the present invention.

1, a liquefied gas processing system 1 according to an embodiment of the present invention includes a liquefied gas storage tank 10, a customer 20, an evaporative gas compressor 30, a pump 40, A heat exchanger 50, an oil storage tank 60, an oil pump 61, a control unit 70, and an on-off valve 80.

Hereinafter, the liquefied gas may be used to encompass all gaseous fuels generally stored in a liquid state, such as LNG or LPG, ethylene, ammonia, etc. In the case where the gas is not in a liquid state by heating or pressurization, . This also applies to the evaporative gas. In addition, LNG can be used to mean not only NG (Natural Gas) in liquid state but also NG in supercritical state for convenience, and evaporation gas can be used to include not only gaseous evaporation gas but also liquefied evaporation gas have.

The liquefied gas storage tank (10) stores liquefied gas to be supplied to the customer (20). The liquefied gas storage tank 10 must store the liquefied gas in a liquid state, wherein the liquefied gas storage tank 10 may have the form of a pressure tank.

Further, this embodiment can efficiently use the evaporated gas by pressurizing the evaporated gas generated in the liquefied gas storage tank 10 and utilizing it as the fuel of the customer 20 to be described later, When the evaporation gas becomes insufficient, the liquefied gas in the liquefied gas storage tank 10 is pressurized by the pump 40 to be described later and supplied to the heat exchanger 50, which will be described later, The embodiment can efficiently use the liquefied gas.

The liquefied gas storage tank 10 stores the amount of evaporation gas generated in the liquefied gas storage tank 10 by a control unit 70 to be described later by a sensor (not shown) provided in the liquefied gas storage tank 10 Or wirelessly.

Here, a booster pump 41, which will be described later, may be provided in the interior of the liquefied gas storage tank 10 in a locking manner.

The consumer 20 consumes the evaporated gas supplied from the liquefied gas storage tank 10. At this time, the customer 20 may be a high-pressure engine, a high-pressure fuel injection engine (for example, a MEGI engine). The customer 20 may include a high-pressure consumer 201 supplied with the high-pressure evaporation gas and a low-pressure consumer 202 supplied with the low-pressure evaporation gas.

The consumer 20 may include an engine (not shown), a boiler (not shown), a turbine (not shown) and a GCU (not shown), and the type of the consumer 20 is not particularly limited Do not.

The engine has a high-pressure engine and a low-pressure engine. The high-pressure engine generally uses high-pressure evaporation gas of about 300 bar, and the low-pressure engine uses low-pressure evaporation gas of about 5 to 10 bar.

The turbine may be, but is not limited to, a gas turbine, a steam turbine, and a steam turbine (HRSG) using waste heat. Turbines can be used to produce power and can be used to generate hull power by being connected to drive shafts that propel propellers directly.

Of course, in this embodiment, the customer 20 may be an engine for driving the propeller, but it may be an engine for generating power or an engine for generating other power. However, the customer 20 may be an internal combustion engine that generates a driving force by the combustion of the evaporative gas.

The consumer 20 is supplied with the evaporative gas pressurized by the evaporative gas compression system (not shown) and can obtain the driving force. The evaporative gas compression system includes the evaporative gas compressor 30 and the evaporative gas cooler 31 ). The state of the evaporative gas supplied to the consumer 20 may vary depending on the state required by the consumer 20.

The high-pressure consumer 201 is a consumer 20 using a high-pressure evaporation gas of about 300 bar compressed by the evaporation gas compressor 30 to be described later and may be, for example, a MEGI engine (not shown) When the evaporation gas is preferentially used but the evaporation gas generated in the liquefied gas storage tank 10 is smaller than the evaporation gas amount required by the high pressure consumer 201, the boosting pump 41 and the high-pressure pump 42, and is heated and supplied by the heat exchanger 50 can be used.

Further, the high-pressure consumer site 201 may be a dual fuel engine capable of using dual fuel. A dual fuel engine is typically a two-stroke engine driven by a diesel cycle. In this diesel cycle, air is compressed by the piston, the compressed high-temperature air is ignited by the pilot fuel, and the remaining high-pressure gas is injected to cause the explosion.

In this case, HFO (Heavy Fuel Oil) or MDO (Marine Diesel Oil) is used as the ignition fuel, and the ratio of the ignition fuel to the high-pressure gas is about 5:95, and the injection amount of the ignition fuel can be adjusted from 5 to 100% Do. Therefore, the ignition fuel is also usable as the driving fuel for the engine.

That is, when the injection amount of the ignition fuel is about 5%, evaporative gas (or heated liquefied gas; about 95%) is mainly used as the engine driving fuel, and when the injection amount of the ignition fuel is 100% When all the fuel (oil) is used and the injection quantity of the ignition fuel is between 5 and 100%, the ignition fuel (oil) and the evaporation gas (or the heated liquefied gas) are mixed and used as the engine driving fuel.

The low-pressure consumer 202 is a consumer 20 using a low-pressure evaporation gas, which is compressed in two or three stages by the evaporation gas compressor 30 and is about 7 to 10 bar, for example, a DFDE engine (not shown) Lt; / RTI >

In addition, the low-pressure consumer 202 may be a dual-fuel engine capable of using a dual fuel, so that it is possible to use not only liquefied gas but also oil as fuel, but a vaporized gas or oil is selectively supplied Fueled engine. This is to prevent the mixture of two materials having different combustion temperatures from being mixed to prevent the low-pressure consumer 202 from being inefficient.

When the evaporated gas generated from the liquefied gas storage tank 10 is smaller than the evaporated gas required by the low-pressure consumer 202, the low-pressure consumer 202 preferentially uses the evaporated gas, but the liquefied gas according to the embodiment of the present invention The processing system 1 can increase the amount of evaporated gas supplied to the low pressure consumer 202 and reduce the amount of evaporated gas supplied to the high pressure consumer 201. [

The high-pressure consumer 201 and the low-pressure consumer 202 can transmit the amount of the evaporation gas required by the high-pressure and low-pressure consumers 201 and 202 to the control unit 70 in a wireless manner.

In the embodiment of the present invention, the evaporation gas supply line 21 is further included. The evaporation gas supply line 21 connects the liquefied gas storage tank 10 and the customer 20 to supply the evaporated gas generated from the liquefied gas storage tank 10 to the customer 20 preferentially.

The evaporation gas supply line 21 may include an evaporation gas compressor 30, an evaporation gas cooler 31, and a heater (not shown).

Since the heater is located at the front end of the evaporative gas compressor 30 and raises the temperature of the evaporative gas introduced into the evaporative gas compressor 30, it is possible to use a normal evaporative gas compressor instead of the ultra-low temperature evaporative gas compressor , There may be an effect of cost reduction. Further, the heater is positioned at the rear end of the evaporative gas compressor (30), so that the evaporation gas can be appropriately adjusted to the required temperature of the customer (20).

The evaporation gas supply line 21 may include a high pressure evaporation gas supply line 211 and a low pressure evaporation gas supply line 212.

The high-pressure evaporation gas supply line 211 connects the liquefied gas storage tank 10 and the high-pressure consumer 201 and supplies the evaporation gas compressed by the evaporation gas compressor 30 at a high pressure to the high-pressure consumer 201 have.

The low-pressure evaporation gas supply line 212 is branched from the second and third stages of the evaporation gas compressor 30 and connected to the low-pressure consumer 202. The evaporation gas compressed to the second stage by the evaporation gas compressor 30 And supplies it to the low-pressure consumer 202.

At this time, an evaporation gas supply valve (not shown) is provided in the high-pressure evaporation gas supply line 211 and the low-pressure evaporation gas supply line 212 so that the supply amount of the evaporation gas can be adjusted have.

In the embodiment of the present invention, a liquefied gas supply line 22 is further included. The liquefied gas supply line 22 connects the liquefied gas storage tank 10 and the consumer 20. The liquefied gas supply line 22 may be connected to the customer 20 bypassing the evaporative gas compressor 30 and may be provided with a boosting pump 41, a high-pressure pump 42 and a heat exchanger 50 .

At this time, a liquefied gas supply valve (not shown) is provided in the liquefied gas supply line 22, and the supply amount of the liquefied gas can be adjusted according to the opening degree of the liquefied gas supply valve.

In the embodiment of the present invention, an oil supply line 23 is further included. The oil supply line 23 connects the oil storage tank 60 and the consumer 20. The oil supply line 23 can be provided with an oil pump 61. An oil supply valve (not shown) is provided on the oil supply line 23 so that the supply amount of the oil Lt; / RTI >

The oil supply line 23 can be connected to the evaporation gas supply line 21 so that the oil and the evaporation gas are mixed on the evaporation gas supply line 21 and can be connected directly to the consumer 20, And the evaporation gas can be mixed.

The evaporation gas compressor (30) is provided on at least one evaporation gas supply line (21) to pressurize the evaporation gas at multiple stages. That is, the evaporation gas compressor 30 is provided on the evaporation gas supply line 21 and pressurizes the evaporation gas generated in the liquefied gas storage tank 10. Further, the plurality of evaporative gas compressors 30 pressurize the evaporative gas to 200 to 400 bar (about 300 bar), and the pressurized evaporative gas may be supplied to the consumer 20 through the evaporative gas supply line 21.

The plurality of evaporation gas compressors (30) can pressurize the evaporation gas at multiple stages. For example, five evaporation gas compressors 30 may be provided so that the evaporation gas is pressurized in five stages. The five-stage pressurized evaporation gas may be pressurized to 200 bar to 400 bar (for example, 300 bar) and supplied to the customer 20 via the evaporation gas supply line 21.

Specifically, the evaporative gas compressor (30) flows into the liquefied gas storage tank (10) at about 1.05 bar and is pressurized to about 5 bar at the first stage, about 15 bar at the second stage, about 90 bar at the third stage, 150 bar in the first stage, and about 300 bar in the fifth stage. The evaporation gas pressurized at the second stage to about 15 bar is supplied to the low pressure consumer 202 by the low pressure evaporation gas supply line 212 or is introduced into the evaporation gas compressor 30 by the high pressure evaporation gas supply line 211, And the evaporated gas pressurized at the fifth stage to about 300 bar can be supplied to the high-pressure consumer 201 by the high-pressure evaporative gas supply line 211.

Between the plurality of evaporative gas compressors 30, an evaporative gas cooler 31 may be provided. When the evaporation gas is pressurized by the evaporation gas compressor 30, the temperature of the evaporation gas compressor 30 is increased as the pressure rises. As a result, the load of the evaporation gas compressor 30 may increase due to the volume increase. The temperature of the evaporation gas can be lowered, and the load of the evaporation gas compressor 30 can be reduced.

The evaporative gas cooler 31 can be installed in the same number as the evaporative gas compressor 30 and each evaporative gas cooler 31 is provided at the downstream end of each evaporative gas compressor 30 to cool the pressurized evaporative gas with a cooling medium can do.

At this time, the evaporative gas cooler 31 can be cooled using seawater or fresh water as a cooling medium, or can be cooled using glycol water. Glycol water is a mixture of ethylene glycol (ethylene glycol) and water.

The pump 40 is provided on the liquefied gas supply line 22 and pressurizes the liquefied gas in the liquefied gas storage tank 10 to supply it to the customer 20. The pump 40 may include a boosting pump 41 or a high pressure pump 42. [

The boosting pump 41 may be provided on the liquefied gas supply line 22 and may be a locking pump or a reciprocating pump so that a sufficient amount of liquefied gas is supplied to the high pressure pump 42, Can be prevented from being cavitated. Also, the booster pump 41 can extract the liquefied gas from the liquefied gas storage tank 10 and pressurize the liquefied gas to several tens of bars or less, preferably 1 to 25 bar.

The high pressure pump 42 pressurizes the liquefied gas discharged from the boosting pump 41 to a high pressure when the evaporation gas generation amount in the liquefied gas storage tank 10 is smaller than the evaporation gas demand amount required by the high pressure consumer 201 So that the liquefied gas can be supplied to the high-pressure consumer 201.

Further, the high-pressure pump 42 pressurizes the liquid-state liquefied gas pressurized by the boosting pump 41 to the heat exchanger 50, which will be described later. At this time, the high-pressure pump 42 pressurizes the liquefied gas to a pressure required by the high-pressure consumer 201, for example, 200 to 400 bar, and supplies the pressurized liquefied gas to the high-pressure consumer 201, Can be produced.

The high-pressure pump 42 can cool down to prevent breakage of the high-pressure pump 42 and to prevent generation of evaporation gas during operation. It is necessary to lower the temperature of the high-pressure pump 42 before the operation of the high-pressure pump 42 because the high-pressure pump 42 treats the cryogenic liquefied gas (for example, -162 ° C). That is, the high-pressure pump 42 needs to cool down (pre-cool).

When the high-pressure pump 42 is not cooled down before the high-pressure pump 42 is operated, the durability of the high-pressure pump 42 is lowered and the driving noise is increased because the high- In extreme cases, breakage can occur. In addition, since the self-temperature of the high-pressure pump 42 is high, when the cryogenic liquefied gas flows into the high-pressure pump 42, evaporation gas is generated in the liquefied gas, so that not only the liquid but also the gas flows into the high- It can cause cavitation.

Therefore, the coolant must be cooled down before the high-pressure pump 42 is operated. As a result, the supply of the liquefied gas to the customer 20 is delayed, so that the stable fuel supply becomes uncertain and the system operation efficiency lowers. (shut down).

Therefore, the liquefied gas processing system 1 of the present invention is provided with the control unit 70 to control the oil in the oil storage tank 60, which will be described later, through the control of the control unit 70 at the time of cooling down of the high- And is supplied to the customer 20, the above problem is solved.

Further, the high-pressure pump 42 is provided with a separate sensor (not shown) to transmit the information of the cool-down start and end to the control unit 70 in a wireless manner.

The heat exchanger (50) is provided on the liquefied gas supply line (22) and exchanges the liquefied gas with the heat exchange medium. The heat exchanger 50 may be provided in the liquefied gas supply line 22 between the customer 20 and the pump 40. The liquefied gas supplied from the pump 40 is heat- .

The heat exchanger 50 may heat the liquefied gas while maintaining the pressure of 200 bar to 400 bar, which is discharged from the pump 40, and heat the liquefied gas in a state of 30 to 60 degrees, and then supply the liquefied gas to the customer 20.

The oil storage tank (60) stores the oil to be supplied to the customer (20). Specifically, the oil storage tank 60 can supply oil to the high-pressure consumer 201 by the oil pump 61. [ The oil storage tank 60 can store the oil at a normal temperature in a liquid state, can prevent an external impact, and can be designed to facilitate storage of oil.

The oil pump 61 is provided on the oil supply line 23 and can supply oil from the oil storage tank 60 to the customer 20. At this time, the oil pump 61 may be a centrifugal type or a reciprocating type.

The controller (70) senses the start or end of the cool-down of the pump (40) and controls the oil supply of the oil storage tank (60).

The control unit 70 calculates an evaporation gas shortage value when the amount of evaporation gas generated in the liquefied gas storage tank 10 is smaller than the amount of evaporation gas required in the consumer 20, It is possible to control the supply of oil from the oil storage tank 60 to the customer 20 by the amount of the shortage of the evaporation gas at the start of the cooldown of the pump 40 and stop the supply of the oil after the cooldown of the pump 40 is completed.

That is, the liquefied gas processing system 1 of the present invention further includes a control unit 70 to drive the on-off valve 80 to be described later through the control unit 70 while the high-pressure pump 42 cools down, So that the system can be smoothly driven.

Specifically, the control unit 70 receives the amount of evaporated gas requested by the customer 20 from the customer 20 and the amount of evaporated gas generated in the liquefied gas storage tank 10 from the liquefied gas storage tank 10, both wirelessly and wirelessly , The information on the start and end of the cool down is received from the high pressure pump 42 by radio and wirelessly so that the oil is supplied to the customer 20 at the start of the cool down, The drive signal can be transmitted to the open / close valve 80 in a wireless manner so that the oil is not supplied to the customer 20.

The opening and closing valve 80 is located at or upstream of the connection point between the evaporation gas supply line 21 and the oil supply line 23 on the oil supply line 23 to regulate the supply of the oil. That is, the on-off valve 80 can be controlled by the control unit 70 to regulate the supply of the oil.

Specifically, the on-off valve 80 receives the signal from the control unit 70, and when the cooldown of the high-pressure pump 42 is started, the on-off valve 80 can be opened so that the oil is supplied to the customer 20, When the cooldown of the high-pressure pump 42 is terminated, it can be closed so that the oil is not supplied to the customer 20.

In this case, the opening / closing valve 80 may be a three-way valve so that the oil supply line 23 and the evaporation gas supply line 21 are connected to each other. The oil supply line 23, the evaporation gas supply line 21, Way valve so that the valve 22 is connected.

When the opening / closing valve 80 is a three-way valve, the supply of liquefied gas to the customer 20 via the liquefied gas supply line 22 can be controlled by the liquefied gas supply valve provided in the liquefied gas supply line 22.

As described above, in the present embodiment, when the amount of evaporative gas generated in the liquefied gas storage tank 10 is smaller than the amount of evaporative gas required in the customer 20, The stable supply of fuel to the customer 20 can be advanced, the efficiency of system operation can be increased, and the system can be prevented from being shut down.

Since the liquefied gas processing system 1 according to the embodiment of the present invention is provided with the customer 20 in which the dual fuel can be used, the oil and the evaporated gas (or the heated liquefied gas) Or only the oil only or the evaporated gas (or the heated liquefied gas) is used, there is no problem in driving the liquefied gas processing system 1.

The ME-GI engine, which uses dual fuel, can be, for example, an ME-GI engine, which uses oil and evaporated gas (or heated liquefied gas) May be used.

2 is a flowchart of a liquefied gas processing method according to an embodiment of the present invention. The liquefied gas processing method according to one embodiment of the present invention can be implemented by the liquefied gas processing system 1 in the embodiment described above, and each step of the liquefied gas processing method will be described below.

2, a method for treating liquefied gas according to an embodiment of the present invention is a method for treating a liquefied gas in a liquefied gas storage tank 10 by a customer 20 by evaporation, which supplies evaporation gas through an evaporation gas supply line 21, A liquefied gas processing device for supplying a liquefied gas by using a pump 40 through a liquefied gas supply line 22 in a liquefied gas storage tank 10 to a customer 20, A method for operating a liquefied gas processing system (1) including an oil treatment device for supplying oil through an oil supply line (23) in an oil storage tank (60), characterized in that a liquefied gas storage tank (10) (S10) < / RTI > (S20) of starting the cool-down of the pump (40) when the amount of evaporative gas generated from the liquefied gas storage tank (10) is smaller than the evaporative gas amount required by the customer (20); (S30) of supplying oil from the oil storage tank (60) to the customer (20) when the pump (40) starts to cool down; A step S40 of cooling down the pump 40; Stopping the supply of oil from the oil storage tank (60) to the customer (20) (S50); And supplying the liquefied gas from the liquefied gas storage tank 10 to the customer 20 (S60).

In step S10, evaporative gas is supplied from the liquefied gas storage tank 10 to the customer 20. The liquefied gas processing method according to the present embodiment is a method for liquefied gas processing in which the evaporation gas generated in the liquefied gas storage tank 10 is first supplied to the customer 20 and then, It is possible to supply the liquefied gas stored in the gas storage tank 10 to the customer 20.

Therefore, the liquefied gas storage tank 10 can first supply the evaporated gas to the customer 20 through the evaporated gas supply line 21.

In step S20, when the amount of evaporative gas generated from the liquefied gas storage tank 10 is smaller than the evaporative gas amount required by the consumer 20, the pump 40 is cooled down.

In the customer 20, the evaporation gas is preferentially consumed, and when the evaporation gas is insufficient, the liquefied gas is supplied from the liquefied gas storage tank 10. Therefore, in this embodiment, when the amount of evaporative gas generated from the liquefied gas storage tank 10 is smaller than the amount of evaporative gas required by the customer 20, the customer 20 supplies the liquefied gas from the liquefied gas storage tank 10 The pump 40 can be activated.

The pump 40 is provided on the liquefied gas supply line 22 and pressurizes the liquefied gas in the liquefied gas storage tank 10 to supply it to the customer 20. The pump 40 may include a boosting pump 41 or a high-pressure pump 42.

The boosting pump 41 can supply a sufficient amount of liquefied gas to the high-pressure pump 42 to prevent cavitation of the high-pressure pump 42 and to remove the liquefied gas from the liquefied gas storage tank 10, To several tens of bar (preferably 1 to 25 bar).

The high-pressure pump 42 pressurizes the liquid-state liquefied gas pressurized by the boosting pump 41 to the customer 20 by the secondary pressure. At this time, the high-pressure pump 42 pressurizes the liquefied gas to a pressure required by the customer 20 (for example, 200 bar to 400 bar) and supplies the liquefied gas to the customer 20 so that the customer 20 produces power through the liquefied gas .

As described above, since the pump 40 handles the ultra-low temperature liquefied gas (about-162 캜), it is necessary to lower the temperature of the pump 40 before the pump 40 is operated. That is, the pump 40 needs to perform cooldown before operation.

When the pump 40 does not cool down before the pump 40 is operated, evaporation gas is generated in the liquefied gas flowing into the pump 40 due to the temperature difference between the ultra-low temperature liquefied gas flowing into the pump 40 and the pump 40 do. Therefore, not only the liquid but also the gas may flow into the pump 40 to cause cavitation, and if the pump 40 is durable due to such cavitation, the pump 40 may be damaged.

In addition, when the pump 40 is not cooled down before the pump 40 is operated, there is a problem in that the pump 40 is not lubricated during operation and the driving noise is increased. In addition, due to the above-described problems, there is a possibility that the operation efficiency of the liquefied gas processing system 1 according to the embodiment of the present invention is lowered, and in the worst case, the system may be shut down.

Therefore, in order to prevent such a problem, in this embodiment, cooldown is performed before the pump 40 is operated.

In step S30, oil is supplied from the oil storage tank 60 to the customer 20 when the pump 40 starts to cool down.

The liquefied gas in the liquefied gas storage tank 10 can not be supplied to the customer 20 when the cool down starts in the pump 40. Therefore, the oil is supplied from the oil storage tank 60 through the oil supply line 23, (20).

Therefore, since the oil is supplied to the customer 20 as much as the amount of the evaporated gas, the stable supply of fuel to the customer 20 can be promoted, the system operation efficiency can be increased, and the system can be shut down . That is, smooth operation of the liquefied gas processing system 1 is enabled, and efficient and reliable operation of the system can be achieved.

In step S40, the pump 40 ends the cooldown.

The cool-down of the pump 40 can be terminated when the temperature of the pump 40 is sufficiently lowered to the extent that the cryogenic liquefied gas can be introduced into the pump 40 (preferably about -162 ° C).

When the temperature of the pump 40 is sufficiently lowered, when the cryogenic liquefied gas flows into the pump 40, the above-described problem does not occur in the pump 40, and the pump 40 is smoothly driven .

Therefore, when the temperature of the pump 40 is sufficiently lowered, the cool-down of the pump 40 can be terminated in order to operate the pump 40 to supply the liquefied gas to the customer 20.

In step S50, the supply of oil from the oil storage tank 60 to the consumer 20 is stopped.

In the embodiment of the present invention, when the cool-down is completed by the pump 40, the liquefied gas in the liquefied gas storage tank 10 is supplied to the oil storage tank 60 The supply of oil to the customer 20 can be stopped.

In the embodiment of the present invention, when the pump 40 supplies the liquefied gas from the liquefied gas storage tank 10 to the customer 20 after the completion of the cooldown, the liquefied gas is gradually supplied The interruption of the oil supply from the oil storage tank 60 to the customer 20 may also be progressively stopped in accordance with the supply of the liquefied gas.

In step S60, the liquefied gas is supplied from the liquefied gas storage tank 10 to the customer 20.

The liquefied gas storage tank 10 starts supplying the liquefied gas to the customer 20 through the liquefied gas supply line 22 so that the pump 40 can be supplied to the customer 20 It is possible to supply the difference to the consumer 20 only by the difference of the evaporated gas amount generated from the liquefied gas storage tank 10 in the required evaporated gas amount.

As described above, in the case where the amount of evaporative gas generated in the liquefied gas storage tank 10 is less than the amount of evaporative gas required in the customer 20, It is possible to supply the fuel to the customer 20 at a timely and appropriate time, thereby improving the driving efficiency of the system and preventing shutdown of the system.

3 is a first partial flow diagram of a liquefied gas processing method in accordance with an embodiment of the present invention. The liquefied gas processing method according to one embodiment of the present invention can be implemented by the liquefied gas processing system 1 in the embodiment described above, and each step of the liquefied gas processing method will be described below.

3, the method for treating a liquefied gas according to an embodiment of the present invention is a method for controlling the liquefied gas according to an embodiment of the present invention, in which the control unit 70 calculates the amount of evaporated gas generated from the liquefied gas storage tank 10 in the liquefied gas storage tank 10, (S11) of receiving the evaporative gas amount required by the customer 20 from the evaporator 20; A step S12 of the control unit 70 calculating an evaporated gas value; If the evaporated gas amount generated in the liquefied gas storage tank 10 is smaller than the evaporated gas amount required by the customer 20, the control unit 70 may further include a step S13 of transmitting a cool down operation signal to the pump 40 Section.

The liquefied gas processing system 1 driving each step may further include a controller 70, and the liquefied gas processing method according to an embodiment of the present invention may be modified such that step S11 of FIG. 3 corresponds to step S10 of FIG. 2 The process starts in the following process, and after the step S13 of FIG. 3 ends, the process S20 of FIG. 2 starts.

The control unit 70 receives the amount of evaporated gas generated from the liquefied gas storage tank 10 in the liquefied gas storage tank 10 and the amount of evaporated gas required by the consumer 20 from the consumer 20 in step S11.

In the liquefied gas storage tank 10, the amount of evaporative gas generated in the liquefied gas storage tank 10 is measured using a measurement sensor (not shown) In the customer 20, the amount of evaporative gas required by the customer 20 can be calculated, and the user can continuously transmit the evaporative gas to the control unit 70 by radio.

The control unit 70 can receive the evaporated gas generated from the liquefied gas storage tank 10 from the liquefied gas storage tank 10 and the evaporated gas amount required by the consumer 20 from the consumer 20 have.

The control unit 70 continuously receives the numerical value of the evaporative gas amount generated in the liquefied gas storage tank 10 and the liquefied gas storage tank 10 from the consumer 20 and the numerical value of the evaporated gas amount required by the consumer 20 It is possible to monitor the state of the evaporative gas generation state of the liquefied gas storage tank 10 and the state of the required evaporative gas amount of the consumer 20 in real time.

In step S12, the controller 70 calculates an evaporation gas shortage value.

The control unit 70 can obtain the difference between the amount of evaporated gas generated in the liquefied gas storage tank 10 received in step S11 and the amount of evaporated gas required by the consumer 20.

At this time, when the evaporated gas amount generated in the liquefied gas storage tank 10 is smaller than the evaporated gas amount required by the customer 20, that is, when the evaporated gas insufficient value occurs, the controller 70 drives the pump 40 So that the liquefied gas stored in the liquefied gas storage tank 10 can be supplied to the customer 20.

When the amount of evaporative gas generated in the liquefied gas storage tank 10 is larger than the amount of evaporative gas required by the customer 20, that is, when the evaporated gas excess value is generated, the controller 70 supplies the surplus evaporated gas to the GCU (Not shown) and a re-liquefying device (not shown) so as to be consumed.

In step S13, when the evaporated gas amount generated in the liquefied gas storage tank 10 is smaller than the evaporated gas amount required by the customer 20, the controller 70 transmits a cool down operation signal to the pump 40. [

When the evaporated gas amount generated in the liquefied gas storage tank 10 is smaller than the evaporated gas amount required by the customer 20, that is, when the evaporated gas insufficient value is calculated, It is possible to control to drive the pump 40 to supply the liquefied gas stored in the gas storage tank 10 to the customer 20.

Prior to drive control of the pump 40, the pump 40 may cool down to prevent breakage of the pump 40 and to prevent cavitation in the pump 40. Accordingly, in order to cool down the pump 40, the control unit 70 may send a cool down operation signal to the pump 40 before the drive control of the pump 40. [

At this time, the pump 40 may include a separate receiving device (not shown) to receive signals transmitted from the controller 70.

4 is a second partial flow diagram of a liquefied gas processing method in accordance with an embodiment of the present invention. The liquefied gas processing method according to one embodiment of the present invention can be implemented by the liquefied gas processing system 1 in the embodiment described above, and each step of the liquefied gas processing method will be described below.

The liquefied gas processing system 1 according to an embodiment of the present invention includes a control unit 70 for controlling the supply of oil to the oil storage tank 60 by detecting the start or end of the cool-down of the pump 40, And an opening / closing valve 80 for regulating the supply.

4, the liquefied gas processing method according to an embodiment of the present invention includes the steps of: when the pump 40 starts to cool down, the control unit 70 transmits an open signal to the open / close valve 80 S21); And the step (S22) in which the on-off valve 80 is opened after receiving the open signal from the control unit 70.

In the liquefied gas processing method according to an embodiment of the present invention, step S21 of FIG. 4 starts when step S20 of FIG. 2 ends, and step S30 of FIG. 2 starts when step S22 of FIG. 4 ends.

In step S21, when the pump 40 starts to cool down, the control unit 70 transmits an open signal to the on-off valve 80. [ When the pump 40 starts to cool down, the pump 40 can send a cool down operation confirming signal to the controller 70. The controller 70 confirms the cool down operation and then opens the opening / closing valve 80 It is possible to send a signal to supply the oil stored in the oil storage tank 60 to the customer 20.

At this time, the on-off valve 80 may receive a signal transmitted from the control unit 70 by having a separate receiving equipment (not shown).

In step S22, the on-off valve 80 is opened after receiving the open signal from the control unit 70. [ The opening and closing valve 80 is opened to allow the oil to be supplied from the oil storage tank 60 to the customer 20.

At this time, the oil supply line 23 may branch on the evaporation gas supply line 21 to connect the evaporation gas supply line 21 and the oil storage tank 60, or may connect the demand storage 20 and the oil storage tank 60 ) Can be directly connected.

Therefore, the oil can be mixed with the evaporation gas on the evaporation gas supply line 21 and supplied to the consumer 20, directly supplied to the consumer 20, and mixed on the consumer 20.

5 is a third partial flow diagram of the liquefied gas processing method according to one embodiment of the present invention. The liquefied gas processing method according to one embodiment of the present invention can be implemented by the liquefied gas processing system 1 in the embodiment described above, and each step of the liquefied gas processing method will be described below.

The liquefied gas processing system 1 according to an embodiment of the present invention includes a control unit 70 for controlling the supply of oil to the oil storage tank 60 by detecting the start or end of the cool-down of the pump 40, And an opening / closing valve 80 for regulating the supply.

5, the liquefied gas processing method according to an embodiment of the present invention includes the steps of: when the pump 40 completes the cool-down operation, the control unit 70 transmits a hermetic signal to the open / close valve 80 S41); And the step (S42) in which the on-off valve 80 is sealed after receiving the hermetic signal from the control unit 70.

In the liquefied gas processing method according to an embodiment of the present invention, step S41 of FIG. 5 starts when step S40 of FIG. 2 is finished, and step S50 of FIG. 2 starts when step S42 of FIG. 5 ends.

In step S41, when the pump 40 completes the cool down, the control unit 70 transmits a hermetic signal to the opening / closing valve 80. [ When the pump 40 completes the cooldown, the pump 40 can send a cool down termination confirmation signal to the controller 70, and the controller 70 confirms the completion of the cooldown, So that the supply of oil to the customer 20 can be stopped.

At this time, the on-off valve 80 may receive a signal transmitted from the control unit 70 by having a separate receiving equipment (not shown).

In step S42, the on-off valve 80 is closed after receiving the hermetic signal from the control unit 70. [ The opening and closing valve 80 can be closed to interrupt the oil supply from the oil storage tank 60 to the customer 20.

The liquefied gas can be supplied to the customer 20 at the end of the cooling down of the pump 40 so that the opening and closing valve 80 blocks the oil supplied from the oil storage tank 60 to the customer 20 through valve sealing, So that the gas can be supplied to the customer 20.

As described above, in the case where the amount of evaporative gas generated in the liquefied gas storage tank 10 is smaller than the amount of evaporative gas required in the customer 20, It is possible to supply the diesel oil instead of the liquefied gas at the time of cooldown of the customer 20, thereby enabling stable supply of the fuel to the customer 20, increasing the system operation efficiency, and shutting down the system There is an effect to prevent a situation.

1: liquefied gas processing system 10: liquefied gas storage tank
20: Demand point 201: High pressure demand point
202: low pressure consumer 21: evaporation gas supply line
211: high pressure evaporation gas supply line 212: low pressure evaporation gas supply line
22: liquefied gas supply line 23: oil supply line
30: Evaporative gas compressor 31: Evaporative gas cooler
40: pump 41: booster pump
42: high-pressure pump 50: heat exchanger
60: Oil storage tank 61: Oil pump
70: control unit 80: opening / closing valve

Claims (15)

An evaporative gas supply line connecting the liquefied gas storage tank and the customer;
A liquefied gas supply line connecting the liquefied gas storage tank and the demander;
A pump provided on the liquefied gas supply line for pressurizing liquefied gas in the liquefied gas storage tank and supplying the liquefied gas to the customer;
An oil supply line connecting the oil storage tank and the demander; And
And a control unit for controlling the oil supply of the oil storage tank by detecting the start or end of the cool-down of the pump, which is pre-driven to switch the fuel supply from the evaporation gas supply line to the liquefied gas supply line,
The control unit
Supplying the oil from the oil storage tank to the customer as much as the difference between the amount of the evaporative gas required at the customer and the amount of the evaporative gas generated at the liquefied gas storage tank at the start of the cool-
And to stop the supply of the oil after the cool-down of the pump is terminated. The method according to claim 1,
Further comprising a heat exchanger provided on the liquefied gas supply line for exchanging liquefied gas with a heat exchange medium. delete 3. The apparatus of claim 2,
Receiving the amount of evaporative gas requested by the demander from the demander,
And a controller for receiving the amount of evaporative gas generated from the liquefied gas storage tank from the liquefied gas storage tank,
And information on the start and end of cooldown from the pump is received, by radio. 5. The apparatus of claim 4,
Calculating an evaporation gas shortage value when the amount of evaporation gas generated in the liquefied gas storage tank is smaller than the amount of evaporation gas required in the customer,
Supplying the oil from the oil storage tank to the customer as much as the evaporation gas shortage value from the start of the cool-down of the pump,
And to stop the supply of the oil after the cool-down of the pump is terminated. delete The method according to claim 1,
Further comprising at least one evaporative gas compressor provided on the evaporative gas supply line and compressing the evaporative gas,
The above-
A low pressure consumer supplied with a low-pressure evaporative gas; And
And a high-pressure consumer which is supplied with high-pressure evaporative gas,
Wherein the evaporation gas supply line includes:
A low pressure evaporation gas supply line branched from the second and third stages of the evaporation gas compressor and connected to the low pressure consumer, for supplying evaporation gas pressurized to the second stage by the evaporation gas compressor to the low pressure consumer; And
And a high-pressure evaporation gas supply line for connecting the liquefied gas storage tank to the high-pressure consumer and supplying the evaporated gas compressed at a high pressure to the high-pressure consumer by the evaporation gas compressor. 8. The method of claim 7,
Further comprising at least one evaporative gas cooler located downstream of the evaporative gas compressor for cooling the pressurized evaporative gas with a cooling medium. The method according to claim 1,
And an oil pump provided on the oil supply line and supplying oil from the oil storage tank to the customer. A liquefied gas processing device for supplying liquefied gas using a pump through a liquefied gas supply line in a liquefied gas storage tank to a customer in a liquefied gas storage tank for supplying liquefied gas to a customer in a liquefied gas storage tank through an evaporated gas supply line; And a control unit for controlling the supply of oil to the oil storage tank by detecting the start or end of the cool-down of the pump, and an oil treatment unit for supplying oil through the oil supply line in the oil storage tank to the customer, A method for driving a gas treatment system,
Supplying a vaporized gas from the liquefied gas storage tank to the customer;
Initiating a cool-down of the pump when the amount of evaporative gas generated from the liquefied gas storage tank is smaller than the evaporative gas amount required by the customer;
Supplying oil from the oil storage tank to the customer;
Terminating cooldown in the pump;
Stopping the supply of oil from the oil storage tank to the customer; And
And supplying the liquefied gas from the liquefied gas storage tank to the customer,
The step of initiating cooldown of the pump comprises:
The control unit receiving an amount of evaporative gas generated from the liquefied gas storage tank in the liquefied gas storage tank and an amount of evaporated gas required by the demander from the demander;
The control unit calculating an evaporation gas shortage value of the customer; And
And the control unit transmits a cool-down operation signal to the pump in accordance with the value of the evaporation gas shortage. delete delete 11. The system of claim 10,
Further comprising an on-off valve controlled by the control unit to control the supply of the oil. 14. The method of claim 13, wherein the step of supplying oil from the oil storage tank to the demanding entity comprises:
When the pump starts to cool down, the control unit transmits an open signal to the open / close valve; And
And the opening / closing valve is opened after receiving the open signal from the control unit. 14. The method of claim 13, wherein stopping the oil supply from the oil storage tank to the demanding entity comprises:
Closing the pump with the opening / closing valve when the pump is cooled down; And
Wherein the opening / closing valve is closed after receiving the hermetic signal from the control unit.

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