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CN116085663B - LNG reliquefaction control system and method - Google Patents

LNG reliquefaction control system and method

Info

Publication number
CN116085663B
CN116085663B CN202310076763.3A CN202310076763A CN116085663B CN 116085663 B CN116085663 B CN 116085663B CN 202310076763 A CN202310076763 A CN 202310076763A CN 116085663 B CN116085663 B CN 116085663B
Authority
CN
China
Prior art keywords
lng
control module
module
main control
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202310076763.3A
Other languages
Chinese (zh)
Other versions
CN116085663A (en
Inventor
苏畅
李晓波
冯静娅
金圻烨
张严
冀青鹏
鲍宇
沈腾
涂世恩
马慧临
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
711th Research Institute of CSIC
Original Assignee
711th Research Institute of CSIC
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Filing date
Publication date
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Priority to CN202310076763.3A priority Critical patent/CN116085663B/en
Publication of CN116085663A publication Critical patent/CN116085663A/en
Application granted granted Critical
Publication of CN116085663B publication Critical patent/CN116085663B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/04—Arrangement or mounting of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0339—Heat exchange with the fluid by cooling using the same fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0369—Localisation of heat exchange in or on a vessel
    • F17C2227/0372—Localisation of heat exchange in or on a vessel in the gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/039—Localisation of heat exchange separate on the pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • F17C2250/032—Control means using computers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/07—Actions triggered by measured parameters
    • F17C2250/072—Action when predefined value is reached
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/031—Dealing with losses due to heat transfer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/044—Avoiding pollution or contamination
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention provides an LNG reliquefaction control system and method, wherein the system comprises an LNG skid block, a signal acquisition module, a main control module, at least one motor power supply module, at least one magnetic suspension control module and a valve control module, wherein the LNG skid block is provided with at least one compression expansion unit, and the main control module is used for executing a system control program and controlling the corresponding compression expansion unit to operate according to a preset value according to sensor data of the signal acquisition module so as to enable BOG of a cargo tank of a ship to be liquefied into LNG again. The invention can avoid waste caused by direct discharge and combustion of the BOG and ensure that the temperature and the pressure in the liquid cargo tank are in a proper range.

Description

LNG reliquefaction control system and method
Technical Field
The invention relates to the technical field of gas reliquefaction, in particular to an LNG reliquefaction control system and method.
Background
Liquefied natural gas (Liquefied Natural Gas, LNG for short) whose main component is methane is condensed into a liquid by cooling the gaseous natural gas to about-162 degrees celsius at atmospheric pressure. The natural gas can greatly save storage and transportation space after liquefaction, and has the characteristics of large heat value, high performance and the like. The low-temperature LNG stored in the LNG storage tank can generate a large amount of flash Gas (BOG for short) in the storage and transportation process due to heat exchange with the outside. In order to ensure the safety of equipment, the generated BOG is usually directly discharged into the atmosphere, so that resource waste, environmental pollution and potential safety hazard are caused.
Therefore, there is a need for an LNG reliquefaction control system that can effectively recover BOG from an LNG storage tank area, reduce BOG emissions, and avoid resource waste and environmental pollution.
Disclosure of Invention
The invention provides an LNG reliquefaction control system and method, which are used for solving the problems of resource waste, environmental pollution and potential safety hazard caused by directly discharging BOG into the atmosphere in the prior art.
In a first aspect, the present invention provides an LNG reliquefaction control system, the system comprising:
the LNG skid is provided with at least one compression and expansion unit, and each compression and expansion unit comprises a motor and a magnetic bearing for controlling the motor;
the signal acquisition module is arranged on the LNG skid and is used for collecting sensor data of each monitoring point;
the main control module is connected with the signal acquisition module and is used for executing a system control program and controlling a corresponding compression expansion unit to operate according to a preset value according to the sensor data so as to enable BOG of the cargo tank of the ship to be liquefied into LNG again;
the motor power supply modules are connected with the main control module, each motor power supply module comprises a controller and a frequency converter connected with the controller, and the frequency converter controls a motor of a corresponding compression expansion unit according to a control signal issued by the main control module;
Each magnetic suspension control module is connected with a controller of a corresponding motor power supply module or directly connected with the main control module and is used for controlling a magnetic bearing of a corresponding compression expansion unit according to a control signal issued by the main control module;
and the valve control module is arranged on the LNG skid and connected with the main control module, and is used for controlling the opening and closing of each valve according to a control signal issued by the main control module.
In an embodiment of the invention, the signal acquisition module and the valve control module are located in a first area of the cargo tank of the ship, the main control module, the motor power supply module and the magnetic levitation control module are located in a second area of the cargo tank of the ship, and the danger level of the first area is greater than that of the second area.
In an embodiment of the present invention, the LNG reliquefaction control system further configures a redundant power supply module for the main control module and a UPS module for each motor power module.
In an embodiment of the present invention, each magnetic suspension control module is installed inside its corresponding motor power module and is connected to the controller of the motor power module and the UPS module, respectively.
In an embodiment of the invention, each motor power module further comprises a switch, and the switch is respectively connected with the frequency converter and the controller.
In an embodiment of the present invention, the main control module further includes a touch screen that performs real-time interaction with an operator.
In a second aspect, the present invention provides a method based on the LNG reliquefaction control system according to any one of the first aspects, the method comprising:
a step of checking before cooling, in which a main control module checks the power supply state of a motor power supply module and the cooling water supply state of an LNG skid according to an inquiry signal issued by a system, and returns an allowable starting signal to the system after the checking is passed;
the pre-cooling step, namely continuously calculating the rotating speed of a motor of each compression and expansion unit by a main control module according to the pre-cooling target temperature, and controlling the motor through a frequency converter according to the calculated rotating speed so as to enable the temperature of a heat exchanger of the compression and expansion unit to be close to the pre-cooling target temperature;
the main control module calculates the motor rotating speed required by each compression and expansion unit according to a preset functional relation, and adjusts the real-time rotating speed of the motor through a frequency converter according to the calculated result so as to enable the BOG of the cargo tank of the ship to be liquefied into LNG again;
the cooling stopping step is that after the cooling step is finished, the main control module adjusts the motor rotation speed of each compression and expansion unit to a first preset value;
and a warming-up step, namely after the cooling stopping step is finished, the main control module adjusts the motor rotating speed of each compression and expansion unit to a second preset value so that the LNG reliquefaction control system does not generate cold energy,
Wherein the second preset value is smaller than the first preset value.
In an embodiment of the present invention, the pre-cooling step further includes:
And when the difference value between the temperature value of the heat exchanger of the compression and expansion unit and the pre-cooling target temperature is within a third preset value and lasts for a first preset time period, judging that the pre-cooling step is finished.
In an embodiment of the invention, the refrigerating step further includes:
The main control module establishes a functional relation among LNG temperature, motor rotating speed, cooling water temperature and refrigerating capacity, continuously records the cooling water temperature and the LNG temperature of preset groups in a third preset time period every second preset time period, and calculates the average value of each group respectively;
based on the functional relation, calculating the rotating speed of the required motor and sending the calculation result to a frequency converter corresponding to the motor through an instruction so as to adjust the real-time rotating speed of the motor.
In an embodiment of the invention, the step of stopping cooling further includes:
After the main control module adjusts the motor of each compression and expansion unit to a first preset value, the main control module opens a corresponding valve through the valve control module at a first preset speed;
when the valve is completely opened, the main control module closes the corresponding valve at a second preset speed, if the LNG flow is reduced to 0 at this time, the stop cooling step is indicated to complete the LNG re-liquefaction control system and method provided by the invention, the main control module is utilized to adjust the frequency converter so as to further control the operation of the compression expansion unit in the LNG re-liquefaction control system, meanwhile, the operation parameters of the motor in the LNG re-liquefaction control system, the temperature, the pressure, the flow and other data of each monitoring point in the LNG skid block obtained by the signal acquisition module are monitored in real time, and the operation parameters of the frequency converter can be accurately controlled based on the data so as to ensure that the compression expansion unit operates according to the preset value, the BOG in the cargo tank is re-condensed into LNG and returns to the cargo tank, waste caused by direct BOG discharging and burning is avoided, and the temperature and the pressure in the cargo tank are ensured to be in a proper range.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an application of the LNG reliquefaction control system provided by the present invention;
Fig. 2 is a block diagram of an LNG reliquefaction control system according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating a LNG reliquefaction control system according to another embodiment of the present invention;
Fig. 4 is a schematic flow chart of a method of LNG reliquefaction control system provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein.
In order to solve the problems of resource waste, environmental pollution and potential safety hazard caused by direct discharge of BOG into the atmosphere in the prior art, the invention provides an LNG reliquefaction control system and method, which utilize a main control module to adjust a frequency converter so as to control the operation of a compression expansion unit in an LNG reliquefaction control system, simultaneously monitor the operation parameters of a motor in the LNG reliquefaction control system, the temperature, the pressure, the flow and other data of each monitoring point in an LNG skid obtained by a signal acquisition module, and accurately control the operation parameters of the frequency converter based on the data so as to ensure that the compression expansion unit operates according to a preset value, lead BOG in a cargo tank to be condensed into LNG again and return to the cargo tank, avoid the waste caused by direct discharge and combustion of the BOG, and ensure that the temperature and the pressure in the cargo tank are in a proper range.
The LNG reliquefaction control system and method of the present invention are described below in conjunction with fig. 1-4.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating an LNG reliquefaction control system according to the present invention. Fig. 1 shows a schematic connection diagram of an LNG reliquefaction control system and an LNG cargo tank provided by the present invention. Illustratively, the connection between the LNG reliquefaction control system and the LNG cargo tank includes an LNG inlet valve, an LNG outlet valve, an LNG bypass valve, a temperature sensor (TT 710), a immersed pump, and a spray device.
The LNG inlet valve may employ a pneumatic control valve for connecting an LNG reliquefaction control system (LSC) to a marine integrated automation system (ISA), which should be opened slowly in order to avoid thermal stress of the plate fin heat exchanger.
Wherein the LNG export valve may employ a hand valve, which is normally open except during maintenance.
Wherein the LNG bypass valve may employ a pneumatic regulator valve for cooling the LNG line. When |TT710-TTLSC | < P1 ℃ (this threshold will be determined during commissioning), this indicates that the refrigeration step is complete. To avoid thermal stresses in the plate fin heat exchanger, the valve should be opened slowly.
Wherein the measurement range of the temperature sensor (TT 710) is-196 ℃ to 55 ℃, and the sensor is used for measuring the LNG inlet temperature, namely the temperature of the LNG delivered to the LNG reliquefaction control system.
The immersed pump can adopt a centrifugal pump, the working range of the immersed pump can be 25m 3/h, and the immersed pump is used for conveying LNG to the LNG reliquefaction control system.
Wherein the spraying device aims at spraying the LNG to the LNG storage tank.
The LNG reliquefaction control system according to the present invention will be described as follows.
Referring to fig. 2, fig. 2 is a block diagram illustrating an LNG reliquefaction control system according to an embodiment of the present invention. An LNG reliquefaction control system is applicable to existing marine integrated automation systems (ISAs). For example, the invention provides a plurality of current mainstream communication modes for a ship Integrated Automation System (IAS) through additionally configured RS485 module, I/O hard point module and Profibus-DP module, and can meet the communication requirements of different ships such as refitting, new shipbuilding and the like.
The LNG reliquefaction control system comprises a main control module, an LNG skid, at least one motor voltage module, at least one magnetic suspension control module, a valve control module and a signal acquisition module.
Illustratively, at least one compression and expansion unit is mounted on the LNG skid, each compression and expansion unit including an electric motor and a magnetic bearing for controlling the electric motor.
It should be noted that, the compression expansion unit adopts an integrated expansion unit and a compressor unit, but the invention can also adopt a non-integrated expansion unit and a non-integrated compressor unit, which are specific according to actual requirements.
The skid is characterized in that equipment is fixed in a structural frame or a container type frame, and pipelines, valves, pumps, containers, meters and the like are integrally combined and installed in the skid. According to the technological process, the space trend and the space arrangement of the modules, the technological equipment, the technological pipelines, the high-structure or the integrated frame in the skid blocks are reasonably planned and arranged according to relevant standards, so that the skid blocks become functional, modularized and immobilized integral equipment.
Illustratively, a signal acquisition module is mounted on the LNG skid for collecting sensor data, such as temperature data, pressure data, and flow data, for each monitoring point.
For example, the components of the signal acquisition module may include 46 temperature sensors, 4 orifice plate flowmeters, 9 differential pressure transmitters, 12 pressure transmitters and 4 rotation speed sensors for monitoring the physical quantity of each monitoring point of the LNG skid.
The main control module is connected with the signal acquisition module, the valve control module, the motor voltage module and the magnetic suspension control module respectively, for example, the main control module can be connected with the signal acquisition module, the valve control module, the motor voltage module and the magnetic suspension control module in a communication way through an Ethernet. The main control module is used for executing a system control program, and controlling the corresponding compression expansion unit to operate according to a preset value according to the sensor data sent by the signal acquisition module so as to enable the BOG of the cargo tank of the ship to be liquefied into LNG again.
It should be noted that the main control module includes a programmable controller, for example, a programmable controller of model S7-300 series. Meanwhile, the main control module can further comprise a touch screen which is interacted with an operator in real time, and the touch screen is in communication connection with the main control module through the Ethernet, so that all operation parameters of the LNG reliquefaction system can be displayed.
Each motor power module is connected with the main control module, and each motor power module comprises a controller and a frequency converter connected with the controller, and the frequency converter controls the motor of the corresponding compression expansion unit according to a control signal issued by the main control module.
For example, the controller of the motor power supply module can adopt a programmable controller with the model number of S7-1200 series, can realize real-time communication with the main control module, can control a compression expansion unit with the rated power of 250kW, and control signals are sent by the main control module.
The aim of each controller is to control the frequency converter and the magnetic suspension control module to stop safely by the controller controlling the motor power module even when the main control module fails accidentally. Furthermore, as different ships use different communication protocols, the requirements of the different communication protocols can be met through the configured controllers.
It should be noted that, a motor power module may control a compression expansion unit, and the matching components of each motor power module include a high-frequency output reactor, an EMC filter, an HF harmonic filter, a capacitor bank, a brake resistor, and so on, so as to provide power for the compression expansion unit. The number of the motor power supply modules is not limited, and for example, two, four or even more motor power supply modules can be used.
Furthermore, the LNG reliquefaction control system can be connected into three-phase AC440V,60Hz or three-phase AC380V,50Hz and single-phase AC220V,60/50Hz power supplies at the same time, and the primary loop is ensured not to interfere the secondary control loop when high-frequency control is carried out.
In some embodiments of the present invention, as shown in fig. 3, each motor power module may further include a switch, which is connected to the frequency converter and the controller, respectively.
Illustratively, each magnetic levitation control module is connected with a controller of its corresponding motor power module (as shown in fig. 3) or directly connected with the main control module (as shown in fig. 2). The magnetic suspension control module is used for controlling the magnetic bearings of the corresponding compression expansion units according to the control signals issued by the main control module, and the magnetic suspension control module and the frequency converter also send all respective parameters to the controller through communication and then send the parameters to the main control module through the controller. The magnetic suspension control module is an important component for ensuring the safe operation of the unit.
That is, the magnetic suspension control module is installed inside the motor power module, can gather the power signal and the signal of 10 displacement sensors on the motor to according to the instruction that main control module sent, guarantee that the interior magnetic bearing of motor operates in safe distance.
The valve control module is also installed on the LNG skid for controlling the opening and closing of each valve according to the control signals issued by the main control module. For example, in order to ensure that the patrol personnel can immediately stop the LNG reliquefaction system when the LNG reliquefaction system is found to have abnormal faults, a plurality of emergency stop buttons can be installed at different positions around the LNG skid, and the buttons are connected with the valve control module to ensure that an emergency stop signal can be timely transmitted to the main control module.
For example, the valve control module kit may include 9 control proportioning valves and 4 emergency stop buttons for controlling the opening of the valve and meeting the safety requirements for system operation.
In some embodiments of the invention, the signal acquisition module and the valve control module are located in a first region of the cargo tank of the ship, and the main control module, the motor power module, and the magnetically levitated control module are located in a second region of the cargo tank of the ship. Wherein the risk level of the first area is greater than the risk level of the second area.
For example, a signal acquisition module and a valve control module which are easy to take explosion-proof measures can be placed in a cargo tank of a ship dangerous grade area, and a main control module, a motor power supply module and a magnetic suspension control module which are not easy to take explosion-proof measures can be placed in a safe area. The safety requirement is met, and meanwhile, the manufacturing cost is reduced.
It should be noted that, the motor power supply module reserves enough installation space for the magnetic suspension control module so as to ensure that part of the magnetic suspension control module can be arranged in the motor power supply module when the magnetic suspension control module cannot meet the explosion-proof requirement and cannot be arranged in a dangerous grade area, thereby reducing the installation volume requirement of the motor power supply module and being more beneficial to being arranged in a narrow space in a cabin.
In some embodiments of the present invention, the present invention also configures a redundant power module for the main control module and a UPS module for each motor power module. Through the redundant power supply module configured at the main control module and the UPS system configured at the motor power supply module, the system can still continuously work for at least a preset time (for example, 30 min) when the power is cut off unexpectedly, and the hardware damage in the LNG reliquefaction module can not be generated due to accidental power cut off.
Based on the above, the invention can also be modified as follows:
For example, the signal acquisition module can be replaced by an intrinsic safety module, all signal cables are replaced by intrinsic safety cables, and all sensors are replaced by intrinsic safety sensors. Therefore, the signal acquisition module can not adopt an explosion-proof cavity, so that the volume of the signal acquisition unit is reduced, and the processing difficulty and the production cost of the signal acquisition unit are reduced.
The beneficial effect of adopting above-mentioned scheme is, through realizing this ampere of return circuit, the signal acquisition unit can not take the flameproof cavity, and then reduces the volume of signal acquisition unit, reduces the processing degree of difficulty and the manufacturing cost of signal acquisition unit simultaneously.
For another example, the invention may also include a data wireless transmission module coupled to the controller of the motor voltage module.
The LNG reliquefaction control system has the beneficial effects that the data wireless transmission module can send all real-time data and historical data operated by the LNG reliquefaction control system to the cloud server, so that offshore data collection and offshore remote maintenance are realized.
In summary, the invention provides an LNG reliquefaction control system based on a programmable logic controller, which interacts with an operator in real time through a main control module and sends instructions to other modules after operation, thereby ensuring operation according to requirements. The motor power supply module and the magnetic suspension control module can enable the compression expansion unit to safely and stably operate. And the signal acquisition module and the valve control module acquire various data of the LNG reliquefaction control system, control the valve opening state and ensure the emergency stop function. In addition, the LNG reliquefaction control system realizes structural modularization, has lower cost and is convenient to maintain.
The method of the LNG reliquefaction control system provided by the present invention will be described below, and the method of the LNG reliquefaction control system described below and the LNG reliquefaction control system described above may be referred to in correspondence with each other.
Referring to fig. 4, fig. 4 is a schematic flow chart of a method of the LNG reliquefaction control system according to the present invention. A method of LNG reliquefaction control system, applied to the LNG reliquefaction control system, the method comprising:
Step 410, check before cool.
The main control module checks the power supply state of the motor power supply module and the cooling water supply state of the LNG skid according to the query signal issued by the system, and returns an allowable starting signal to the system (namely the ship comprehensive automation system) after the check is passed.
Specifically, the total rated power of the LNG reliquefaction control system (abbreviated as the present system) according to the present invention may be set to 1000kW. In order to ensure the safety of equipment and a power grid, firstly, a distribution board of a ship control system (abbreviated as an upper system) sends a heavy load inquiry signal to the system, and a main control module with a programmable logic controller automatically checks the power supply state of a motor power cabinet and the cooling water supply state of an LNG skid after receiving the signal, and sends an allowable starting signal to a control console of the upper system after no alarm. After receiving the start permission signal, the console of the upper system can send a start command to the system. When the system receives a starting command sent by the upper system, the main control module judges that the checking step before cooling is finished.
Step 420, a pre-cooling step.
The main control module continuously calculates the rotating speed of the motor of each compression and expansion unit according to the pre-cooling target temperature, and controls the motor through the frequency converter according to the calculated rotating speed so that the temperature of the heat exchanger of the compression and expansion unit is close to the pre-cooling target temperature.
Specifically, after the inspection step before cooling is completed, the system automatically enters a pre-cooling stage, the pre-cooling target temperature can be set to a certain preset value (for example, minus 155 ℃), the main control module always calculates the rotating speed of the control motor, and data is sent to the frequency converter, so that the temperature value of the heat exchanger of the compression and expansion unit gradually approaches to the pre-cooling target temperature with the descending gradient of the preset speed (for example, 2 ℃). And when the difference value between the temperature value of the heat exchanger of the compression and expansion unit and the pre-cooling target temperature is within a third preset value (such as 10 ℃) and is maintained for a first preset time period (such as 10 minutes), judging that the pre-cooling step is finished.
Because LNG needs to be pre-cooled first in the LNG line before it is passed into the system. As shown in fig. 1, the LNG inlet valve is closed, the LNG bypass valve is opened, and LNG is transferred to the pipeline by the shower pump to circulate. When the temperature of the temperature sensor (TT 710) reaches a low temperature threshold, LNG line pre-chilling ends, at which point the system will send a signal "SIG LNG R". Clicking the COOL DOWN button, and after the precooling mode is finished, the system sends a signal SIG_LSC_R.
For example, after the LNG pipeline pre-cooling is completed, the system transmits a signal "sig_lng_r", and at the same time, when the system pre-cooling is completed, the system transmits a signal "sig_lsc_r". At this point, LNG may be passed to the present system.
Step 430, refrigeration step.
The main control module calculates the motor rotation speed required by each compression and expansion unit according to a preset functional relation, and adjusts the real-time rotation speed of the motor through the frequency converter according to the calculation result so as to enable the BOG of the cargo tank of the ship to be liquefied into LNG again.
Specifically, after the pre-cooling step is completed, the LNG inlet valve (PGV 700) is completely closed while the LNG bypass valve (PGV 702) is completely opened, and the LNG supply pump supplies LNG to the present system at a steady flow rate not less than a preset value (e.g., 30m 3/h). The main control module establishes a functional relation between LNG temperature and motor rotating speed, cooling water temperature and refrigerating capacity, continuously records the cooling water temperature and LNG temperature of a preset group (10 groups) at intervals of a third preset time period (2 s for example) every second preset time period (30 min for example), calculates average values respectively, calculates the required motor rotating speed based on the functional relation, and sends instructions to the frequency converter to adjust the real-time rotating speed of the motor, so that the refrigerating capacity generated by the system is enough to liquefy redundant natural gas into LNG again and convey the LNG back to the cargo tank.
Step 440, stopping the cooling step.
The main control module adjusts the motor of each compression and expansion unit to a first preset value after the refrigeration step is finished.
Specifically, when the system completes refrigeration, after receiving a stop command, the main control module adjusts the rotation speed of the motor to a first preset value (for example, 40%). And then the main control module opens the valve (PGV 702) at a constant speed at a first preset speed (such as 0.5%/30 s), and after the valve is completely opened, the main control module closes the valve (PGV 700) at a constant speed at a second preset speed (such as 0.5%/30s, which can be equal to the first preset speed) until the valve is completely closed, and at this time, if the LNG flow rate is reduced to 0, the cooling step is stopped.
Step 450, warm-up step.
The method further includes the step of stopping cooling, wherein the main control module adjusts the motor of each compression and expansion unit to a second preset value so that the LNG reliquefaction control system does not generate cold, and the second preset value is smaller than the first preset value.
For example, after the system finishes stopping the cooling step, the warm-up button is turned on, and the main control module adjusts the rotation speed of the motor to a second preset value (for example, 30%), so that the system can not generate cold under the rotation speed. When the temperature value of the heat exchanger (TI 302) of the compression-expansion unit is larger than a set value, in the embodiment, the temperature value is 10 ℃ or the accumulation of the warm-up time reaches the set value, in the embodiment, the temperature value is 8 hours or the system receives a warm-up forced stop command, and the main control module reduces the rotating speed of the motor to 0 and cuts off the power.
Furthermore, in order to prevent the main control module from controlling the frequency converter to adjust the rotating speed of the motor to be too fast to cause severe fluctuation of the refrigerating capacity, the invention is provided with the rotating speed limiter and the refrigerating capacity limiter, and when the rotating speed limiter and the refrigerating capacity limiter reach the maximum limiting value, the motor is controlled to operate at a fixed rotating speed.
It should be noted that, the method for controlling the LNG reliquefaction system provided by the embodiment of the present invention can realize the functions implemented by the system embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the system embodiment in the present embodiment are omitted.
It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the technical solution described in the above-mentioned embodiments may be modified or some technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiments of the present invention.

Claims (10)

1.一种LNG再液化控制系统的方法，其特征在于，所述LNG再液化控制系统包括LNG撬块、信号采集模块、主控模块以及至少一个电机电源模块；其中，所述LNG撬块安装有至少一个压缩膨胀机组；所述信号采集模块安装在所述LNG撬块上；所述主控模块与所述信号采集模块连接；所述至少一个电机电源模块与所述主控模块连接，每个电机电源模块均包括控制器和与所述控制器连接的变频器；1. A method for controlling an LNG reliquefaction system, characterized in that the LNG reliquefaction control system comprises an LNG skid, a signal acquisition module, a main control module, and at least one motor power module; wherein the LNG skid is equipped with at least one compression expander; the signal acquisition module is mounted on the LNG skid; the main control module is connected to the signal acquisition module; the at least one motor power module is connected to the main control module, and each motor power module comprises a controller and a frequency converter connected to the controller; 所述方法包括：The method comprises: 冷前检查步骤：主控模块根据系统下发的问询信号对电机电源模块的电源状态和LNG撬块的冷却水供给状态进行检查，检查通过后给系统返回允许启动信号；Pre-cold check steps: The main control module checks the power status of the motor power module and the cooling water supply status of the LNG skid according to the inquiry signal sent by the system. If the check passes, it returns a start-up permission signal to the system; 预冷步骤：主控模块根据预冷目标温度持续计算每台压缩膨胀机组的电机的转速，并根据计算出的转速通过变频器控制该电机以使得该压缩膨胀机组的换热剂的温度接近所述预冷目标温度；Precooling step: The main control module continuously calculates the speed of the motor of each companding expansion unit according to the precooling target temperature, and controls the motor through the inverter according to the calculated speed so that the temperature of the heat exchanger of the companding expansion unit approaches the precooling target temperature; 制冷步骤：主控模块根据预设函数关系计算每台压缩膨胀机组所需的电机转速，并将计算结果通过变频器调节该电机的实时转速以使得船舶液货舱的BOG再度液化为LNG；Refrigeration step: The main control module calculates the required motor speed of each compression expansion unit according to the preset function relationship, and adjusts the real-time speed of the motor through the inverter to re-liquefy the BOG in the ship's cargo tank into LNG; 停止冷却步骤：当所述制冷步骤结束后，主控模块将每台压缩膨胀机组的电机转速调整至第一预设值；Stop cooling step: after the cooling step is completed, the main control module adjusts the motor speed of each compression expansion unit to a first preset value; 暖机步骤：当所述停止冷却步骤结束后，主控模块将每台压缩膨胀机组的电机转速调整至第二预设值以使得所述LNG再液化控制系统不产生冷量，Warming-up step: After the stopping and cooling step is completed, the main control module adjusts the motor speed of each compression expansion unit to a second preset value so that the LNG reliquefaction control system does not generate cooling capacity. 其中，所述第二预设值小于所述第一预设值。The second preset value is smaller than the first preset value. 2.根据权利要求1所述的LNG再液化控制系统的方法，其特征在于，所述预冷步骤还包括：2. The LNG reliquefaction control system method according to claim 1, wherein the pre-cooling step further comprises: 当该压缩膨胀机组的换热剂的温度数值与所述预冷目标温度的差值在第三预设值以内并且持续第一预设时间段后，判定所述预冷步骤完成。When the difference between the temperature value of the heat exchanger of the compression expansion unit and the pre-cooling target temperature is within a third preset value and lasts for a first preset time period, it is determined that the pre-cooling step is completed. 3.根据权利要求1所述的LNG再液化控制系统的方法，其特征在于，所述制冷步骤还包括：3. The LNG reliquefaction control system method according to claim 1, wherein the refrigeration step further comprises: 主控模块建立LNG温度和电机转速、冷却水温度和制冷量间的函数关系，每隔第二预设时间段，连续记录第三预设时间段内的预设组冷却水温度和LNG温度并分别计算每组的平均值；The main control module establishes a functional relationship between the LNG temperature and the motor speed, the cooling water temperature and the cooling capacity, and continuously records the cooling water temperature and LNG temperature of the preset group within the third preset time period every second preset time period and calculates the average value of each group respectively; 基于所述函数关系，计算所需电机的转速并将计算结果通过指令下发至该电机对应的变频器以调节该电机的实时转速。Based on the functional relationship, the required motor speed is calculated and the calculation result is sent to the frequency converter corresponding to the motor through an instruction to adjust the real-time speed of the motor. 4.根据权利要求1所述的LNG再液化控制系统的方法，其特征在于，所述停止冷却步骤还包括：4. The LNG reliquefaction control system method according to claim 1, wherein the step of stopping cooling further comprises: 在主控模块将每台压缩膨胀机组的电机调整至第一预设值之后，主控模块以第一预设速度通过阀门控制模块打开对应的阀门；After the main control module adjusts the motor of each compression expansion unit to a first preset value, the main control module opens the corresponding valve through the valve control module at a first preset speed; 当该阀门完全开启后，主控模块再以第二预设速度关闭对应的阀门，若此时LNG流量降为0，则表示所述停止冷却步骤完成。When the valve is fully opened, the main control module closes the corresponding valve at a second preset speed. If the LNG flow rate drops to 0 at this time, it means that the cooling stop step is completed. 5.一种LNG再液化控制系统，其特征在于，用于执行权利要求1-4任一项所述的LNG再液化控制系统的方法，所述系统包括：5. An LNG reliquefaction control system, characterized in that it is used to execute the method of the LNG reliquefaction control system according to any one of claims 1 to 4, the system comprising: LNG撬块，其安装有至少一个压缩膨胀机组，每台压缩膨胀机组包括电机和用于控制所述电机的磁轴承；An LNG skid having at least one compander installed thereon, each compander including a motor and a magnetic bearing for controlling the motor; 信号采集模块，其安装在所述LNG撬块上，用于收集各个监测点的传感器数据；A signal acquisition module, which is installed on the LNG skid and is used to collect sensor data at each monitoring point; 主控模块，其与所述信号采集模块连接，用于执行系统控制程序并根据所述传感器数据控制对应的压缩膨胀机组按照预设值运行以使得船舶液货舱的BOG再度液化为LNG；a main control module, connected to the signal acquisition module, configured to execute a system control program and control the corresponding compression expansion unit to operate according to preset values based on the sensor data so as to reliquefy the BOG in the ship's cargo tank into LNG; 至少一个电机电源模块，其与所述主控模块连接，每个电机电源模块均包括控制器和与所述控制器连接的变频器，所述变频器根据所述主控模块下发的控制信号控制对应的压缩膨胀机组的电机；at least one motor power module connected to the main control module, each motor power module including a controller and a frequency converter connected to the controller, the frequency converter controlling the motor of the corresponding compression expander unit according to a control signal sent by the main control module; 至少一个磁悬浮控制模块，每个磁悬浮控制模块与其对应的电机电源模块的控制器连接或直接与所述主控模块连接，用于根据所述主控模块下发的控制信号以控制对应的压缩膨胀机组的磁轴承；At least one magnetic levitation control module, each magnetic levitation control module is connected to the controller of its corresponding motor power module or directly connected to the main control module, and is used to control the magnetic bearing of the corresponding compression and expansion unit according to the control signal issued by the main control module; 阀门控制模块，其安装在所述LNG撬块上且与所述主控模块连接，用于根据所述主控模块下发的控制信号以控制每个阀门的打开和关闭。A valve control module is installed on the LNG skid and connected to the main control module, and is used to control the opening and closing of each valve according to the control signal sent by the main control module. 6.根据权利要求5所述的LNG再液化控制系统，其特征在于，所述信号采集模块和所述阀门控制模块位于船舶液货舱的第一区域，所述主控模块、所述电机电源模块以及所述磁悬浮控制模块位于船舶液货舱的第二区域，所述第一区域的危险等级大于所述第二区域的危险等级。6. The LNG reliquefaction control system according to claim 5 is characterized in that the signal acquisition module and the valve control module are located in a first area of the ship's liquid cargo tank, and the main control module, the motor power module and the magnetic levitation control module are located in a second area of the ship's liquid cargo tank, and the danger level of the first area is greater than the danger level of the second area. 7.根据权利要求5所述的LNG再液化控制系统，其特征在于，所述LNG再液化控制系统还为所述主控模块配置冗余供电模块和为每个电机电源模块配置UPS模块。7. The LNG reliquefaction control system according to claim 5, characterized in that the LNG reliquefaction control system further configures a redundant power supply module for the main control module and a UPS module for each motor power module. 8.根据权利要求7所述的LNG再液化控制系统，其特征在于，每个磁悬浮控制模块安装在其对应的电机电源模块内部，且分别与该电机电源模块的控制器和UPS模块连接。8. The LNG reliquefaction control system according to claim 7, wherein each magnetic levitation control module is installed inside its corresponding motor power module and is respectively connected to the controller and UPS module of the motor power module. 9.根据权利要求5所述的LNG再液化控制系统，其特征在于，每个电机电源模块还包括交换机，所述交换机分别与所述变频器和所述控制器连接。9. The LNG reliquefaction control system according to claim 5, wherein each motor power module further comprises a switch, and the switch is connected to the inverter and the controller respectively. 10.根据权利要求5所述的LNG再液化控制系统，其特征在于，所述主控模块还包括与操作员进行实时交互的触控屏。10. The LNG reliquefaction control system according to claim 5, wherein the main control module further comprises a touch screen for real-time interaction with an operator.
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CN203835683U (en) * 2014-03-25 2014-09-17 重庆耐德能源装备集成有限公司 Flash steam variable frequency compressor system and natural gas liquefaction system applied same

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