CN107883185A - LNG feeders and its workflow, LNG air supply systems - Google Patents

LNG feeders and its workflow, LNG air supply systems Download PDF

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Publication number
CN107883185A
CN107883185A CN201710539197.XA CN201710539197A CN107883185A CN 107883185 A CN107883185 A CN 107883185A CN 201710539197 A CN201710539197 A CN 201710539197A CN 107883185 A CN107883185 A CN 107883185A
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CN
China
Prior art keywords
lng
controller
valve
pipeline
pressure
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.)
Pending
Application number
CN201710539197.XA
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Chinese (zh)
Inventor
刘建朔
赵娟
王宏成
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Shanghai Enn New Energy Technology Co Ltd
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Shanghai Enn New Energy Technology Co Ltd
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Priority to CN201710539197.XA priority Critical patent/CN107883185A/en
Publication of CN107883185A publication Critical patent/CN107883185A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F17D1/02—Pipe-line systems for gases or vapours
    • 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
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/054—Size medium (>1 m3)
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/046—Methods for emptying or filling by even emptying or filling
    • 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
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0626—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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0631—Temperature
    • 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
    • F17C2265/06—Fluid distribution
    • F17C2265/063—Fluid distribution for supply of refuelling stations
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
    • F17C2270/0171—Trucks

Landscapes

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

Abstract

The present invention relates to LNG supply technologies field, discloses a kind of LNG feeders and its workflow, LNG air supply systems；LNG feeders include：Pressure channel, including the first stop valve, the first pressure regulator valve, the first gasifier, first pressure sensor and the second stop valve being sequentially connected；Liquid feeding channel, including the 3rd stop valve, the first control valve, gasification installation, regulator, the first temperature sensor and the second pressure sensor being sequentially connected；The controller being connected with the first pressure regulator valve, first pressure sensor, the first control valve, second pressure sensor and the first temperature sensor signal, is used for：The aperture of the first pressure regulator valve is controlled according to the signal of first pressure sensor；The folding of the first control valve is controlled according to the signal of second pressure sensor and the first temperature sensor.The automaticity of above-mentioned LNG feeders is higher, is guarded without personnel, and directly can carry out feed flow using LNG tank cars or LNG movable tanks case.

Description

LNG gas supply device and work flow thereof, and LNG gas supply system
Technical Field
The invention relates to the technical field of LNG gas supply systems, in particular to an LNG gas supply device, a working process thereof and an LNG gas supply system.
Background
In recent years, a large number of natural gas liquefaction projects are built in China, imported Liquefied Natural Gas (LNG) resources are increased year by year, price competitiveness is enhanced, and the LNG delivery price in middle and east regions is even lower than that of pipeline natural gas; meanwhile, the atmospheric pollution treatment strength of the country is continuously increased, coal-to-gas policies are issued successively from the country to the place, and coal-to-gas projects in various places are promoted to develop more quickly; in addition, some areas do not have the pipeline to transport natural gas; therefore, small LNG single-point direct supply devices are more and more favored, and the construction of the gasification station presents an explosive state. However, the existing single-point direct supply device has simple and original process, and most of control operations need to be finished manually, so the problems of potential safety hazard, responsibility consciousness and the like are more prominent. The problems that the automation level needs to be improved and the reliability control management is realized are solved; therefore, how to design an LNG supply system with high automation degree is a problem to be solved urgently.
Disclosure of Invention
The invention discloses an LNG gas supply device, a working process thereof and an LNG gas supply system, and aims to provide an LNG gas supply system with high automation degree.
In order to achieve the purpose, the invention provides the following technical scheme:
an LNG gas supply device comprises a pressurization channel and a liquid supply channel; the pressurization channel comprises a pressurization liquid phase quick connector, a first stop valve, a first gasifier, a second stop valve and a pressurization gas phase quick connector which are connected in sequence; the liquid supply channel comprises an LNG liquid supply quick interface, a third stop valve, a gasification device, a pressure regulating device and a user pipeline interface which are connected in sequence;
the boost passage further includes:
a first pressure regulating valve provided between the first shutoff valve and the first carburetor;
a first pressure sensor disposed between the first vaporizer and the second shutoff valve;
the liquid supply passage further includes:
a first control valve provided between the third stop valve and the gasification device;
the second pressure sensor is arranged between the pressure regulating device and the user pipeline interface;
the first temperature sensor is arranged between the pressure regulating device and the user pipeline interface;
the LNG gas supply device also comprises a controller, wherein the controller is respectively in signal connection with the first pressure regulating valve, the first pressure sensor, the first control valve, the second pressure sensor and the first temperature sensor and is used for:
controlling and adjusting the opening degree of the first pressure regulating valve according to the pressure signal of the first pressure sensor;
and controlling and adjusting the opening and closing of the first control valve according to signals of the second pressure sensor and the first temperature sensor.
The LNG gas supply device can automatically control the opening degree of the first pressure regulating valve in the pressurizing channel through the first pressure sensor and the controller, particularly, the first pressure sensor can detect the pressure of natural gas formed by gasification in the pressurizing channel, when the pressure is within a set pressure range, the controller controls the first pressure regulating valve to stop acting, and when the pressure exceeds the set pressure range, the controller controls the first pressure regulating valve to correspondingly act so as to change the opening degree, so that the natural gas flow is controlled and regulated, further, the LNG gas supply device can automatically and accurately control the pressurizing process in the LNG tank, and the safety of the pressurizing process and the flow regulation of the liquid supply channel are ensured; in addition, in the LNG gas supply device, the opening and closing of the first control valve in the liquid supply channel can be automatically controlled through the second pressure sensor, the first temperature sensor and the controller, specifically, the second pressure sensor can detect the pressure of the natural gas supplied to the user end, the first temperature sensor can detect the temperature of the natural gas supplied to the user end, and when the detection signals of the second pressure sensor and the first temperature sensor exceed the set range, the controller can automatically control the first control valve to be closed, so that the safety of the liquid supply operation process is ensured. In addition, because the degree of automation of the LNG supply device is high, the LNG tank wagon or the LNG mobile tank can be directly used for supplying liquid, namely, the LNG tank can be the LNG tank wagon or the LNG mobile tank, and further, the LNG supply device does not need a fixed storage tank, so that the early investment cost is low; in addition, the liquid supply process of the LNG supply device does not need to be watched by workers, so that the labor cost is low; therefore, the LNG supply device can greatly reduce the cost of an LNG supply system.
In conclusion, the LNG gas supply device can realize automatic control and adjustment of pressurization and liquid supply processes of the LNG tank box, and is high in automation degree and good in safety performance.
Preferably, the liquid supply passage further comprises: the second control valve is arranged between the pressure regulating device and the user pipeline interface; a third pressure sensor provided between the third cut-off valve and the first control valve; the controller is respectively in signal connection with the second control valve and the third pressure sensor and is used for: and controlling and adjusting the opening and closing of the first control valve and the second control valve according to signals of the second pressure sensor, the third pressure sensor and the first temperature sensor.
Preferably, the liquid supply passage further comprises: a buffer tank disposed between the gasification device and the pressure regulating device; one end of the safe emptying pipeline is communicated with the buffer tank, and the other end of the safe emptying pipeline is communicated with the atmosphere space; and a first safety valve is arranged on the safety vent pipeline.
Preferably, the liquid supply passage further comprises: and the fourth pressure sensor is arranged on the buffer tank and is in signal connection with the controller.
Preferably, the liquid supply passage further comprises: a second temperature sensor disposed between the gasification device and the buffer tank; the gasification device comprises at least two gasification pipelines which are mutually connected in parallel, and each gasification pipeline comprises a fourth control valve, a second gasifier and a fourth stop valve which are sequentially connected in the direction from the first control valve to the buffer tank; the controller is in signal connection with the second temperature sensor and the fourth control valve in each gasification pipeline and is used for controlling the fourth control valves in the at least two gasification pipelines to be switched on and off according to the temperature signal of the second temperature sensor.
Preferably, the LNG supply apparatus further includes: one end of the safe diffusion channel is communicated with a pipeline between the first control valve and the gasification device, and the other end of the safe diffusion channel is communicated with the buffer tank; a second safety valve is arranged on the safety diffusing channel; one end of the first pipeline is communicated with a pipeline between the first gasifier and the second stop valve, and the other end of the first pipeline is communicated with the safe diffusion channel; and a third safety valve is arranged on the first pipeline.
Preferably, the LNG supply apparatus further includes: one end of the second pipeline is communicated with a pipeline between the first gasifier and the second stop valve, and the other end of the second pipeline is communicated with a pipeline between the first control valve and the gasification device; a fifth control valve is arranged on the second pipeline; the controller is in signal connection with the fifth control valve and is used for controlling the opening and closing of the fifth control valve.
Preferably, the pressure regulating device comprises two pressure regulating pipelines which are connected in parallel, and each pressure regulating pipeline comprises a fifth stop valve, a second pressure regulating valve and a sixth stop valve which are connected in sequence.
Preferably, the liquid supply passage further comprises: and the flowmeter is arranged between the pressure regulating device and the user pipeline interface and is in signal connection with the controller.
Preferably, the LNG supply apparatus further includes: the first gas detector is in signal connection with the controller and used for detecting the gas concentration in the air near the pressurized gas phase quick interface and sending the gas concentration information to the controller; the second gas detector is in signal connection with the controller and used for detecting the gas concentration in the air near the user pipeline interface and sending the gas concentration information to the controller; the third gas detector is in signal connection with the controller and used for detecting the gas concentration in the air near the gasification device and sending the gas concentration information to the controller; and the temperature detector is in signal connection with the controller and is used for sensing the temperature of the air near the gasification device and sending the temperature information to the controller.
A work flow of an LNG supply apparatus as in any one of the above technical solutions, comprising:
opening the first stop valve, the second stop valve and the third stop valve;
controlling the first pressure regulating valve to be opened; when the pressure signal of the first pressure sensor exceeds a first set pressure range, the first pressure regulating valve is controlled to act until the pressure signal of the first pressure sensor reaches the first set pressure range;
controlling the first control valve and the second control valve to be opened; and when the pressure signal of the second pressure sensor exceeds a second set pressure range, and/or the pressure signal of the third pressure sensor exceeds a third set pressure range, and/or the temperature signal of the first temperature sensor exceeds the first set temperature range, controlling the first control valve and/or the second control valve to be closed.
An LNG supply system comprises the LNG supply device in any one of the technical schemes; the local client is in signal connection with a controller in the LNG supply device and is used for displaying the working state of the LNG supply device according to the signal provided by the controller and driving the control operation of the controller; the terminal server is in signal connection with a controller in the LNG supply device and is used for remotely driving the control operation of the controller; the mobile client is in signal connection with the terminal server; and the LNG supply device is used for acquiring the working state information of the LNG supply device through the terminal server and driving the control operation of the controller through the terminal server.
Drawings
Fig. 1 is a schematic structural diagram of an LNG supply apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an LNG tank in an LNG gas supply system according to an embodiment of the present invention;
fig. 3 is a schematic partial structural diagram of an LNG supply system according to an embodiment of the present invention;
fig. 4 is a flowchart of an operation of an LNG supply device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Please refer to fig. 1 to fig. 4.
As shown in fig. 1 and 2, an LNG supply apparatus according to an embodiment of the present invention includes:
the system comprises a pressurization channel, a first pressure regulating valve, a second pressure regulating valve, a first vaporizer 103, a first pressure sensor 104, a second stop valve 105 and a pressurization liquid-gas quick interface 106, wherein the pressurization channel comprises a pressurization liquid-phase quick interface 100, the first stop valve 101, the first pressure regulating valve 102, the second vaporizer 103, the first pressure sensor 104 and the second stop valve 105 which are connected in sequence; the pressurized liquid phase quick connector 100 and the pressurized liquid gas quick connector 106 are respectively used for being connected with a liquid phase pipeline 302 and a gas phase pipeline 301 of the LNG tank 300; the LNG in the LNG tank 300 can enter a pipeline of the pressurizing channel from the pressurizing liquid-phase quick connector 100, and is gasified by the first gasifier 103 in the pressurizing channel and then re-delivered back to the LNG tank 300 from the pressurizing liquid-gas quick connector 106, so that the LNG tank 300 is pressurized;
the liquid supply channel comprises an LNG liquid supply quick interface 200, a third stop valve 201, a first control valve 203, a gasification device 204, a pressure regulating device 205, a first temperature sensor 207, a second pressure sensor 208 and a user pipeline interface 209 which are connected in sequence; the LNG liquid supply quick interface 200 is used for being connected with another liquid phase pipeline 303 of the LNG tank 300, and the user pipeline interface 209 is used for being connected with a user end; the LNG in the LNG tank 300 can enter the liquid supply channel from the LNG liquid supply quick interface 200, and is gasified by the gasification device 204 and then output from the user pipeline interface 209 to the user side, so as to supply natural gas to the user.
A controller in signal connection with the first pressure regulating valve 102 and the first pressure sensor 104 in the pressure boost passage, and specifically configured to control and regulate an opening degree of the first pressure regulating valve 102 according to a pressure signal of the first pressure sensor 104; further, the controller is in signal connection with the first control valve 203, the second pressure sensor 208 and the first temperature sensor 207 in the liquid supply channel, and is specifically configured to control and adjust the opening and closing of the first control valve 203 according to the signals of the second pressure sensor 208 and the first temperature sensor 207.
The LNG gas supply device can automatically control the opening of the first pressure regulating valve 102 in the pressurizing channel through the first pressure sensor 104 and the controller, specifically, the first pressure sensor 104 can detect the pressure of the natural gas formed by gasification in the pressurizing channel, when the pressure is within a set pressure range, the controller controls the first pressure regulating valve 102 not to act, and when the pressure exceeds the set pressure range, the controller controls the first pressure regulating valve 102 to act correspondingly to change the opening, so as to realize the control and regulation of the flow of the natural gas, further, the LNG gas supply device can realize the automatic and accurate control of the pressurizing process in the LNG tank 300, so as to ensure the safety of the pressurizing process and the regulation of the flow of the liquid supply channel; in addition, in the LNG supply device, the opening and closing of the first control valve in the liquid supply channel can be automatically controlled by the second pressure sensor 208, the first temperature sensor 207 and the controller, specifically, the second pressure sensor 208 can detect the pressure of the natural gas supplied to the user end, the first temperature sensor 207 can detect the temperature of the natural gas supplied to the user end, and when the detection signals of the second pressure sensor 208 and the first temperature sensor 207 exceed the set ranges thereof, the controller can automatically control the first control valve 203 to close, so as to ensure the safety of the liquid supply operation process.
In conclusion, the LNG gas supply device can realize automatic control and adjustment of the pressurization and liquid supply processes of the LNG tank 300, and is high in automation degree and good in safety performance. In addition, because the degree of automation of the LNG gas supply device is high, the LNG gas supply device can directly adopt an LNG tanker or an LNG mobile tank to supply liquid, that is, the LNG tank 300 can be an LNG tanker or an LNG mobile tank, and further, the LNG gas supply device does not need a fixed storage tank, and the early investment cost is low; in addition, the liquid supply process of the LNG supply device does not need to be watched by workers, so that the labor cost is low; therefore, the LNG supply device can greatly reduce the cost of an LNG supply system.
As shown in fig. 1, in a specific embodiment, in the LNG supply apparatus provided in the embodiment of the present invention, the liquid supply channel may further include:
a second control valve 206 disposed between the pressure regulating device 205 and the user line interface 209, the second control valve 206 being in signal connection with the controller;
a third pressure sensor 202 arranged between the third stop valve 201 and the first control valve 203, the third pressure sensor 202 being in signal connection with the controller;
further, the controller may be specifically configured to: the opening and closing of the first control valve 203 and the second control valve 206 are controlled and adjusted according to signals of the first temperature sensor 207, the second pressure sensor 208 and the third pressure sensor 202; specifically, the second pressure sensor 208 and the third pressure sensor 202 may respectively detect the pressure of the natural gas supplied to the user side and the pressure of the LNG output from one end of the LNG tank 300, the first temperature sensor 207 may detect the temperature of the natural gas supplied to the user side, and the controller may automatically control the first control valve 203 and/or the second control valve 206 to close when the detection signals of the second pressure sensor 208, the third pressure sensor 202 and the first temperature sensor 207 exceed their set ranges, so as to ensure the safety of the liquid supply operation process.
As shown in fig. 1, on the basis of the above embodiment, in a specific embodiment, the LNG supply apparatus according to an embodiment of the present invention further includes a buffer tank 210, where the buffer tank 210 is disposed between the gasification device 204 and the pressure regulating device 205;
further, the buffer tank 210 may be connected to a safety vent line, specifically, one end of the safety vent line is communicated with the buffer tank 210, the other end of the safety vent line is communicated with the atmosphere space, and the safety vent line is provided with a first safety valve 211; when the pressure in the buffer tank 210 exceeds a certain threshold value, the first safety valve 211 can be automatically opened, so that natural gas in the buffer tank 210 is allowed to be diffused into the air, the pressure in the buffer tank 210 and the air supply channel can be relieved, and the safety of the air supply process is further ensured.
As shown in fig. 1, on the basis of the above embodiment, in a specific embodiment, the liquid supply channel may further include a fourth pressure sensor 214 disposed on the buffer tank 210, and specifically, the fourth pressure sensor 214 is in signal connection with the controller for detecting the air pressure in the buffer tank 210 and transmitting the detection signal to the controller.
As shown in fig. 1, on the basis of the above embodiment, in a specific embodiment, the LNG supply device according to the embodiment of the present invention may further include a safety relief channel, one end of the safety relief channel is communicated with the pipeline between the first control valve 203 and the gasification device 204 in the liquid supply channel, and the other end of the safety relief channel is communicated with the buffer tank 210; and a second safety valve 212 is arranged on the safety relief passage.
Further, the LNG supply device provided by the embodiment of the present invention may further include a first pipeline, where one end of the first pipeline is communicated with a pipeline between the first vaporizer 103 and the second stop valve 105 in the pressurization channel, and the other end of the first pipeline is communicated with the safety relief channel; and a third relief valve 213 is provided on the first pipe.
A section of conveying pipeline of the liquid supply channel can be communicated with the buffer tank 210 through the safety relief channel, and the on-off of the conveying pipeline is controlled through a second safety valve 212; furthermore, when the natural gas remained in the pipeline of the liquid supply channel is not ready for manual release due to system stop, misoperation or operation problems, the pressure relief of the pipeline can be realized by the automatic tripping of the second safety valve 212, so that the natural gas is released into the buffer tank 210; similarly, the first pipeline connects a section of pipeline of the pressurizing channel with the buffer tank 210, and is controlled to be connected or disconnected by the third safety valve 213; furthermore, when the natural gas remaining in the pipeline of the pressurizing passage is not ready for manual release due to system stop, misoperation or operation problems, the pressure relief of the pipeline can be realized by the automatic tripping of the third safety valve 213, so as to release the natural gas into the buffer tank 210; in addition, when the pressure in the buffer tank 210 reaches a set pressure value, the first safety valve 211 on the safety emptying pipeline can automatically jump to realize the final release to the atmosphere; therefore, the arrangement can realize secondary diffusion of residual natural gas in the liquid supply channel and the pressurizing channel so as to avoid the natural gas from being diffused into the air at the first time.
Preferably, the safe emptying pipeline, the safe diffusing channel and the first pipeline can be respectively provided with a manual stop valve, so that the diffusion of natural gas in each stage of pipeline can be controlled manually.
As shown in fig. 1, based on the above embodiment, in a specific embodiment, the LNG supply apparatus provided in the embodiment of the present invention may further include a second temperature sensor 215 disposed on the pipeline between the gasification device 204 and the buffer tank 210, for detecting the temperature of the natural gas flowing through the pipeline;
further, the gasification device 204 may include at least two gasification pipelines connected in parallel with each other, each gasification pipeline includes a fourth control valve 216, a second gasifier 217 and a fourth stop valve 218 connected in sequence from the first control valve 203 to the buffer tank 210;
further, the controller may be in signal connection with the second temperature sensor 215 and the fourth control valve 216 in each gasification pipeline, and the controller may control the fourth control valve 216 in the at least two gasification pipelines to switch on and off according to the temperature signal of the second temperature sensor 215, that is, the controller may control different gasification pipelines to be opened at each time interval through a built-in program of the controller, and further switch to use different second gasifiers 217 at each time interval.
For example, the gasification device 204 may include two gasification pipelines, the second temperature sensor 215 may detect the temperature of the natural gas output by the gasification device 204 in real time and transmit the temperature signal to the controller, and when the temperature detected by the second temperature sensor 215 is lower than the required temperature, the controller may automatically control the switching of the use states of the two gasification pipelines, that is, control the fourth control valve 216 of the currently used gasification pipeline to be closed, and simultaneously open the fourth control valve 216 of the other gasification pipeline, so as to ensure that the operation state of the gasification device 204 is continuously stable.
As shown in fig. 1, based on the above embodiments, in a specific embodiment, the LNG supply apparatus according to the embodiment of the present invention may further include a second pipeline, one end of which is connected to a pipeline between the first vaporizer 103 and the second stop valve 105, and the other end of which is connected to a pipeline between the first control valve 203 and the vaporizer 204; and a fifth control valve 219 is arranged on the second pipeline;
further, in the LNG supply device provided in the embodiment of the present invention, the controller is in signal connection with the fifth control valve 219 and is configured to control opening and closing of the fifth control valve 219.
Specifically, when the pressure of the LNG tank 300 or the pressure of the pressurizing passage is too high, the fifth control valve 219 may be opened by the controller to release the gasified fuel gas in the pressurizing passage into the liquid supply passage for use by the user.
Alternatively, the pressure increasing passage may be further provided with a fifth pressure sensor 220 between the first cut valve 101 and the first pressure regulating valve 102; further, the controller may automatically control and regulate the fifth control valve 219 based on the pressure signals of the first pressure sensor 104 and the fifth pressure sensor 220 in the boost passage.
On the basis of the above embodiments, in a specific embodiment, each section of the pipeline provided with the pressure sensor may be further provided with a pressure gauge; adopt manometer and pressure sensor one-to-one, cooperation to use promptly, wherein, pressure sensor is used for sending pressure signal to controller, and the manometer is used for showing pressure strength value direct indication to the staff can read on the spot.
As shown in fig. 1, in a specific embodiment based on the above embodiments, the pressure regulating device 205 may include two pressure regulating lines connected in parallel, and each pressure regulating line includes a fifth stop valve 221, a second pressure regulating valve 222, and a sixth stop valve 223 connected in sequence.
Alternatively, the second pressure regulating valve 222 may automatically regulate the opening according to the fluid pressure in the pipe, so as to control the finally output fluid flow; therefore, the pressure regulating pipeline can automatically regulate the flow of the natural gas delivered to the user end through the second pressure regulating valve 222, so as to meet the natural gas output condition of the user end. Of course, the opening degree of the second pressure regulating valve 222 may be controlled and regulated by a signal from the controller.
The pressure regulating device 205 is provided with two pressure regulating pipelines connected in parallel, and further, when one of the two pipelines fails, the other pipeline can be started, so that maintenance can be performed under the condition of uninterrupted gas supply; specifically, when the second pressure regulating valve 222 of a certain pressure regulating pipeline is maintained, the fifth stop valve 221 and the sixth stop valve 223 at the two ends of the certain pressure regulating pipeline can be closed, and further, the quick maintenance can be realized under the condition that the work of the liquid supply channel is not influenced.
It should be noted that each of the stop valves may be a manual stop valve; the pressure regulating valves and the control valves may be controlled not only by signals from the controller but also manually.
As shown in fig. 1, based on the above embodiments, in a specific embodiment, the LNG supply apparatus according to an embodiment of the present invention may further include a cryogenic filter 224 disposed between the third stop valve 201 and the first control valve 203; and a check valve 225 disposed between the first control valve 203 and the gasification device 204;
further, the liquid supply passage may further include a flow meter 226 provided between the second control valve 206 and the user line interface 209, and an odorizing machine 227 provided between the flow meter 226 and the user line interface 209; wherein, the flow meter 226 is in signal connection with the controller; optionally, the flow rate of the liquid supply pipeline may be detected by the flow meter 226, so as to monitor the usage of the LNG tank 300; specifically, the controller may set an alarm point according to the LNG amount in the initial LNG tank 300, and when the flow meter 226 detects that the periodic total flow is close to the initial total amount in the LNG tank 300, the controller controls the alarm to start alarming and transmits a signal to the terminal server group, the terminal server group may transmit the signal to an LNG tank car in a nearby area, and the LNG tank car may negotiate to go after receiving the signal, thereby implementing automatic scheduling.
As shown in fig. 1 and 2, an embodiment of the present invention further provides an LNG supply system, which includes an LNG supply device in any of the above embodiments; the LNG supply system may further include an LNG tank 300 connected to the LNG supply; specifically, the LNG tank 300 may be an LNG tanker tank or an LNG mobile tank; in the LNG supply device, a pressurized liquid phase quick connector 100 and a pressurized liquid gas quick connector 106 are respectively connected with a liquid phase pipeline 302 and a gas phase pipeline 301 of an LNG tank 300; the LNG supply quick connector 200 is connected to another liquid phase pipeline 303 of the LNG tank 300.
As shown in fig. 1 and fig. 2, based on the above embodiments, in a specific embodiment, the LNG supply system provided by the embodiment of the present invention may further include a first gas detector 20, a second gas detector 30, a third gas detector 40, and a temperature detector 50, which are in signal connection with the controller 1 of the LNG supply system; wherein,
the first gas detector 10 is located near the liquid phase pipeline 302/303 and the gas phase pipeline 301 of the LNG tank 300, and is configured to detect the gas concentration of the air near the connection interface between the LNG tank 300 and the LNG supply device, and send the gas concentration information to the controller 1;
the second gas detector 30 is located near the user pipeline interface 209, and is configured to detect a gas concentration in air near the user pipeline interface 209 and send gas concentration information to the controller 1;
the third gas detector 40 is positioned near the gasification device 204 and used for detecting the gas concentration in the air near the gasification device 204 and sending the gas concentration information to the controller 1;
temperature probe 50 is located near gasification device 204 and is configured to sense the temperature of the air near gasification device 204 and send temperature information to controller 1.
The first gas detector 20, the second gas detector 30, the temperature detector 50 and the third gas detector 40 are respectively arranged in the LNG tank 300 area, the gasification device 204 area and the final gas supply area, so that the whole gas supply system can be monitored in real time. In addition, a camera can be installed in the area of the gasification device 204 to realize video monitoring on the equipment site.
As shown in fig. 3, on the basis of the foregoing embodiment, in a specific embodiment, the LNG supply system provided in the embodiment of the present invention may further include:
an on-site client 2, the on-site client 2 being used for on-site monitoring operation service; specifically, the local client 2 is in signal connection with the controller 1 in the LNG supply device, is used for displaying the working state of the LNG supply device according to the signal provided by the controller 1, and can be used for controlling the operation of the driving controller 1; optionally, the local client 2 may include a touch screen and is embedded with configuration software;
a terminal server 3, the terminal server 3 being used for remote monitoring operation; specifically, the terminal server 3 is in signal connection with the controller 1 in the LNG supply device, and can also display the operating state of the LNG supply device according to the signal provided by the controller 1 and drive the controller 1 to operate;
the mobile client 4 is in signal connection with the terminal server 3; the LNG supply device comprises a terminal server 3, a controller 1 and a controller, wherein the terminal server 3 is used for acquiring the working state information of the LNG supply device and driving the controller 1 to work through the terminal server 3; optionally, the mobile client 4 may include a "give" client APP application "point-to-butler" for processing information of the LNG gas supply system.
In the LNG supply device, a controller 1 can receive signals of all sensors, flowmeters and detectors in the LNG supply device, and controls the actions of each pressure regulating valve and each control valve according to the acquired signals of pressure, temperature, flow and the like and a program arranged in the controller, thereby realizing the automatic control of the work of the LNG supply device; moreover, the controller 1 can also transmit the acquired signals of pressure, temperature, flow and the like to the terminal server 3, and the terminal server 3 can realize remote control through the controller 1 according to the signals; in addition, the terminal server 3 can transmit signals to the mobile client 4 at the same time, and the "give" client APP application installed in the mobile client 4 can also realize monitoring of device parameters and control operation of each valve through the terminal server 3 and the controller 1. In addition, the local client 2, the terminal server 3 and the mobile client 4 can realize real-time monitoring of equipment operation parameters and videos, and can be provided with an emergency cut-off function, and when emergency needs to be cut off rapidly, the valves can be controlled to be closed in sequence by one key, so that remote cut-off is realized.
Optionally, the terminal server 3 may be in signal connection with multiple LNG gas supply devices at the same time, that is, monitoring of multiple LNG gas supply devices is simultaneously achieved, and the terminal server 3 may modify remote monitoring permissions of different mobile clients 4 on an LNG gas supply system by performing permission setting on multiple mobile clients 4.
As shown in fig. 1, fig. 2 and fig. 4, based on the LNG supply device provided in the embodiment of the present invention, the embodiment of the present invention further provides a working process of the LNG supply device; the work flow comprises the following steps:
step S101 of opening the first stop valve 101, the second stop valve 105, and the third stop valve 201;
step S102, the controller 1 controls the first pressure regulating valve 102 to open; when the pressure signal of the first pressure sensor 104 exceeds the first set pressure range, the controller 1 controls the first pressure regulating valve 102 to operate until the pressure signal of the first pressure sensor 104 reaches the first set pressure range; at this time, LNG in the LNG tank 300 may enter the pressurization pipeline from the pressurization liquid-phase quick connector 100, and may be transported back to the LNG tank 300 from the pressurization liquid-gas quick connector 106 after being gasified by the first vaporizer 103, thereby implementing pressurization of the LNG tank 300;
step S103, the controller 1 controls the first control valve 203 and the second control valve 206 to be opened; at this time, LNG in the LNG tank 300 may enter the liquid supply pipeline from the LNG liquid supply quick interface 200, and is gasified by the gasification device 204 and then output from the user pipeline interface 209 to the user side; and, when the pressure signal of the second pressure sensor 208 exceeds the second set pressure range; and/or the pressure signal of the third pressure sensor 202 exceeds a third set pressure range; and/or when the temperature signal of the first temperature sensor 207 exceeds the first set temperature range, the controller 1 controls and adjusts the first control valve 203 and/or the second control valve 206 to close.
As shown in fig. 2, an embodiment of the present invention further provides a work flow of an LNG supply system, where the work flow may include:
the controller 1 receives signals of various sensors, detectors and flow meters and sends the signals to the local client 2 and the terminal server 3;
the local client 2 displays the working state of the LNG supply device according to the signal provided by the controller 1 and drives the control operation of the controller 1;
the terminal server 3 displays the working state of the LNG supply device according to the signal provided by the controller 1 and drives the control operation of the controller 1;
the terminal server 3 transmits the signal provided by the controller to the mobile client 4, and the mobile client 4 drives the control operation of the controller 1 through the terminal server 3.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. An LNG gas supply device comprises a pressurization channel and a liquid supply channel; the pressurization channel comprises a pressurization liquid phase quick connector, a first stop valve, a first gasifier, a second stop valve and a pressurization gas phase quick connector which are connected in sequence; the liquid supply channel comprises an LNG liquid supply quick interface, a third stop valve, a gasification device, a pressure regulating device and a user pipeline interface which are connected in sequence; it is characterized in that the preparation method is characterized in that,
the boost passage further includes:
a first pressure regulating valve provided between the first shutoff valve and the first carburetor;
a first pressure sensor disposed between the first vaporizer and the second shutoff valve;
the liquid supply passage further includes:
a first control valve provided between the third stop valve and the gasification device;
the second pressure sensor is arranged between the pressure regulating device and the user pipeline interface;
the first temperature sensor is arranged between the pressure regulating device and the user pipeline interface;
the LNG gas supply device also comprises a controller, wherein the controller is respectively in signal connection with the first pressure regulating valve, the first pressure sensor, the first control valve, the second pressure sensor and the first temperature sensor and is used for:
controlling and adjusting the opening degree of the first pressure regulating valve according to the pressure signal of the first pressure sensor;
and controlling and adjusting the opening and closing of the first control valve according to signals of the second pressure sensor and the first temperature sensor.
2. LNG supply plant according to claim 1,
the liquid supply passage further includes:
the second control valve is arranged between the pressure regulating device and the user pipeline interface;
a third pressure sensor provided between the third cut-off valve and the first control valve;
the controller is respectively in signal connection with the second control valve and the third pressure sensor and is used for:
and controlling and adjusting the opening and closing of the first control valve and the second control valve according to signals of the second pressure sensor, the third pressure sensor and the first temperature sensor.
3. The LNG supply of claim 2, wherein the liquid supply channel further comprises:
a buffer tank disposed between the gasification device and the pressure regulating device;
one end of the safe emptying pipeline is communicated with the buffer tank, and the other end of the safe emptying pipeline is communicated with the atmosphere space; and a first safety valve is arranged on the safety vent pipeline.
4. The LNG supply of claim 3, wherein the liquid supply channel further comprises:
and the fourth pressure sensor is arranged on the buffer tank and is in signal connection with the controller.
5. The LNG supply of claim 3, wherein the liquid supply channel further comprises:
a second temperature sensor disposed between the gasification device and the buffer tank;
the gasification device comprises at least two gasification pipelines which are mutually connected in parallel, and each gasification pipeline comprises a fourth control valve, a second gasifier and a fourth stop valve which are sequentially connected in the direction from the first control valve to the buffer tank;
the controller is in signal connection with the second temperature sensor and the fourth control valve in each gasification pipeline and is used for controlling the fourth control valves in the at least two gasification pipelines to be switched on and off according to the temperature signal of the second temperature sensor.
6. The LNG supply according to claim 3, further comprising:
one end of the safe diffusion channel is communicated with a pipeline between the first control valve and the gasification device, and the other end of the safe diffusion channel is communicated with the buffer tank; a second safety valve is arranged on the safety diffusing channel;
one end of the first pipeline is communicated with a pipeline between the first gasifier and the second stop valve, and the other end of the first pipeline is communicated with the safe diffusion channel; and a third safety valve is arranged on the first pipeline.
7. The LNG supply according to claim 3, further comprising:
one end of the second pipeline is communicated with a pipeline between the first gasifier and the second stop valve, and the other end of the second pipeline is communicated with a pipeline between the first control valve and the gasification device; a fifth control valve is arranged on the second pipeline;
the controller is in signal connection with the fifth control valve and is used for controlling the opening and closing of the fifth control valve.
8. LNG supply apparatus according to any one of claims 1 to 7,
the pressure regulating device comprises two pressure regulating pipelines which are connected in parallel, and each pressure regulating pipeline comprises a fifth stop valve, a second pressure regulating valve and a sixth stop valve which are connected in sequence.
9. The LNG supply apparatus of any one of claims 1 to 7, wherein the liquid supply channel further comprises:
and the flowmeter is arranged between the pressure regulating device and the user pipeline interface and is in signal connection with the controller.
10. The LNG supply apparatus of any one of claims 1 to 7, further comprising:
the first gas detector is in signal connection with the controller and used for detecting the gas concentration in the air near the pressurized gas phase quick interface and sending the gas concentration information to the controller;
the second gas detector is in signal connection with the controller and used for detecting the gas concentration in the air near the user pipeline interface and sending the gas concentration information to the controller;
the third gas detector is in signal connection with the controller and used for detecting the gas concentration in the air near the gasification device and sending the gas concentration information to the controller;
and the temperature detector is in signal connection with the controller and is used for sensing the temperature of the air near the gasification device and sending the temperature information to the controller.
11. A process for operating an LNG supply as claimed in any of claims 2 to 10, comprising:
opening the first stop valve, the second stop valve and the third stop valve;
controlling the first pressure regulating valve to be opened; when the pressure signal of the first pressure sensor exceeds a first set pressure range, the first pressure regulating valve is controlled to act until the pressure signal of the first pressure sensor reaches the first set pressure range;
controlling the first control valve and the second control valve to be opened; and when the pressure signal of the second pressure sensor exceeds a second set pressure range, and/or the pressure signal of the third pressure sensor exceeds a third set pressure range, and/or the temperature signal of the first temperature sensor exceeds the first set temperature range, controlling the first control valve and/or the second control valve to be closed.
12. An LNG supply system comprising the LNG supply device according to any one of claims 1 to 10; and the number of the first and second groups,
the local client is in signal connection with a controller in the LNG supply device and is used for displaying the working state of the LNG supply device according to the signal provided by the controller and driving the control operation of the controller;
the terminal server is in signal connection with a controller in the LNG supply device and is used for remotely driving the control operation of the controller;
the mobile client is in signal connection with the terminal server; and the LNG supply device is used for acquiring the working state information of the LNG supply device through the terminal server and driving the control operation of the controller through the terminal server.
CN201710539197.XA 2017-07-04 2017-07-04 LNG feeders and its workflow, LNG air supply systems Pending CN107883185A (en)

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CN110469773A (en) * 2018-05-12 2019-11-19 中国石油化工股份有限公司 A kind of LNG long distance delivery device and its delivery method
CN114623303A (en) * 2022-02-24 2022-06-14 上海齐耀动力技术有限公司 Connecting device for LNG tank car and LNG tank car pipeline

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