CN108361547B - New LNG filling station and its working method - Google Patents
New LNG filling station and its working method Download PDFInfo
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- CN108361547B CN108361547B CN201810105285.3A CN201810105285A CN108361547B CN 108361547 B CN108361547 B CN 108361547B CN 201810105285 A CN201810105285 A CN 201810105285A CN 108361547 B CN108361547 B CN 108361547B
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- 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
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- 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
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- 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
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- 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
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
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- 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
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
- F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
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- 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
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- 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)
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- 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
- F17C2205/0329—Valves manually actuated
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- 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
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- 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
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- 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
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- 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
- F17C2227/01—Propulsion of the fluid
- F17C2227/0128—Propulsion of the fluid with pumps or compressors
- F17C2227/0157—Compressors
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- 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
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/0439—Temperature
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a novel LNG filling station, which comprises an LNG tank car, an LNG storage tank, an LNG filling machine, a storage tank pressurizing gasifier, a unloading pressurizing gasifier, a BOG recycling compressor and a plurality of LNG buffer tanks, wherein the LNG tank car is connected with the LNG tank car; the LNG storage tank is connected with the LNG tank wagon through a liquid inlet main pipe and a gas pipeline, and gas phase ports of the LNG storage tank, the BOG recovery compressor and the LNG tank wagon are sequentially communicated through pipelines; the LNG buffer tanks are connected with the LNG storage tank in parallel through pipelines, and each LNG buffer tank is respectively communicated with the BOG recovery compressor and the LNG storage tank in sequence through different pipelines to form a forward passage and a reverse passage; each LNG buffer tank is also communicated with the LNG dispenser and the LNG storage tank in sequence through pipelines; valves are arranged on the pipelines to realize the selection of LNG or BOG circulation lines in different working states. Also discloses a working method of the novel LNG filling station.
Description
Technical Field
The invention relates to the technical field of LNG (liquefied Natural gas) filling stations, in particular to a novel LNG filling station and a working method thereof.
Background
LNG (liquefied natural gas ) is a clean and efficient source of energy. Natural gas is becoming more and more favored as a clean energy source, and LNG is being listed as the preferred fuel in many countries, with the proportion of natural gas in the energy supply increasing rapidly. Liquefied natural gas is growing at a high rate of about 12% per year, becoming one of the most rapidly growing energy industries worldwide. LNG vehicles have been developed in recent years as clean energy vehicles in countries, and LNG gas stations have been built in a large area as in spring bamboo shoots after raining.
BOG (flash gas) refers to low temperature gas after LNG liquid is gasified under pressure below critical temperature, and because LNG is a low temperature fluid, although LNG gas station equipment has good heat insulation measures, during storage and operation, a certain amount of gas, namely BOG, is inevitably generated due to natural heat transfer and system cooling needs, and as the amount of BOG increases, the temperature and pressure in the LNG storage tank increases, and to some extent BOG has to be released to reduce the pressure in the tank.
Currently, the main stream LNG filling stations in the market mostly adopt LNG immersed pumps as equipment for the LNG pressurization process. The disadvantages include: 1. when the LNG storage tank is at a low liquid level, the LNG storage tank is difficult to meet the liquid inlet requirement of an LNG immersed pump pool, and the LNG immersed pump is easy to pump out when running; 2. the outlet pressure of the LNG immersed pump is greatly influenced by the pressure of an LNG storage tank and the liquid temperature of the LNG, and under the conditions of low pressure of the LNG storage tank, high pressure of an LNG vehicle-mounted bottle and low liquid temperature of the LNG, the outlet pressure of the conventional LNG immersed pump is difficult to ensure so as to meet the filling requirement of the LNG vehicle-mounted bottle.
Disclosure of Invention
The invention aims to solve the problems and provide a novel LNG filling station using a low-temperature BOG recovery compressor and an LNG buffer tank to replace an LNG immersed pump and a working method thereof.
The technical scheme adopted by the invention is as follows:
the novel LNG filling station comprises an LNG tank wagon, an LNG storage tank, an LNG filling machine, a storage tank pressurizing gasifier and a unloading pressurizing gasifier, wherein the LNG storage tank is connected with the storage tank pressurizing gasifier through a pipeline, a liquid unloading port, a gas phase port and a pressurizing port are formed in the LNG tank wagon, the pressurizing port and the gas phase port are respectively connected with the unloading pressurizing gasifier through pipelines, and the novel LNG filling station further comprises a BOG recycling compressor and a plurality of LNG buffer tanks;
the LNG tank is connected with the LNG tank wagon through a liquid inlet main pipe and a gas pipeline, the liquid inlet main pipe is connected with the liquid discharging port, the gas pipeline is connected with a gas phase port of the LNG tank wagon, the liquid inlet main pipe and the gas pipeline are communicated through branch pipes, and the LNG tank, the BOG recovery compressor and the gas phase port of the LNG tank wagon are sequentially communicated through pipelines, so that BOG in the LNG tank can enter the LNG tank wagon through the BOG recovery compressor;
the LNG buffer tanks are connected with the LNG storage tank in parallel through pipelines, each LNG buffer tank is respectively communicated with the BOG recovery compressor and the LNG storage tank through different pipelines to form a forward passage and a reverse passage, BOG in the LNG buffer tank in the forward passage enters the LNG storage tank through the BOG recovery compressor, and BOG in the LNG storage tank in the reverse passage enters the LNG buffer tank through the BOG recovery compressor; each LNG buffer tank is also communicated with the LNG dispenser and the LNG storage tank in sequence through pipelines;
valves are arranged on the pipelines to realize the selection of LNG or BOG circulation lines in different working states.
In the above technical scheme, the valves on the pipelines are manual valves and/or pneumatic valves, different LNG or BOG circulation routes are selected by regulating and controlling the opening and closing of the valves, and the manual valves or the pneumatic valves are easy to purchase in the market, low in cost and easy to operate.
Preferably, the number of the LNG buffer tanks is two, the two LNG buffer tanks can meet the use requirement of the gas station, and the double buffer tanks are utilized to ensure the pre-cooling continuity of the LNG dispenser and the filling continuity of the LNG vehicle-mounted bottle. And two LNG buffer tanks are convenient for arrange, and space reasonable in design.
Preferably, the liquid inlet main pipe is branched into two liquid inlet branch pipes connected with the LNG storage tank, so that the liquid inlet efficiency of unloading is higher, and the unloading time is shortened; the two liquid inlet branch pipes are provided with the manual valve and the pneumatic valve, so that the use is convenient.
Preferably, the BOG recovery compressor is a low-temperature recovery compressor, and has high working efficiency, mature technology and easy purchase.
Preferably, a pressure sensor and a liquid level sensor are arranged on the LNG storage tank, and temperature sensors are arranged on a pipeline between the LNG buffer tank and the BOG recovery compressor and a pipeline between the LNG buffer tank and the LNG storage tank. The use of the sensor enables the work of the gas station to be closely monitored in real time, errors and accidents are prevented, accurate and precise control can be achieved, and safety is guaranteed.
And the pipelines among the liquid inlet main pipe, the LNG buffer tank and the LNG dispenser are all provided with one-way valves, so that backflow is prevented, and the safety is ensured.
A method of operating the novel LNG fueling station of any of claims 1 to 7 comprising the steps of:
1. LNG unloading:
(1) Self-balancing: opening a valve on a gas pipeline between the LNG storage tank and the LNG tank wagon, so that BOG in the LNG storage tank enters the LNG tank wagon through the pipeline; (2) recovery: after self-balancing is completed, valves of the LNG storage tank-BOG recovery compressor-LNG tank wagon passages are opened, and other valves are closed, so that BOG in the LNG storage tank is recovered into the LNG tank wagon through the BOG recovery compressor, the pressure in the LNG storage tank is further reduced, and the pressure in the LNG tank wagon is increased; (3) self-pressurization: the LNG tank wagon is self-pressurized by utilizing the unloading pressurizing gasifier; (4) unloading: when the pressure in the LNG tank wagon reaches a set value, a valve on the liquid inlet main pipe is opened to enable LNG in the LNG tank wagon to flow into the LNG storage tank, and unloading is achieved; in the unloading process, the LNG tank wagon can be pressurized through an unloading pressurizing gasifier or BOG in the LNG storage tank is recovered to the LNG tank wagon by utilizing a BOG recovery compressor to realize pressurization;
2. LNG filling:
(1) LNG buffer tank filling and pressurization: opening a valve on a pipeline between the LNG storage tank and one of the LNG buffer tanks to enable LNG in the LNG storage tank to flow into the LNG buffer tanks, and when the pressure in the LNG buffer tanks is higher than the pressure in the LNG storage tank and the LNG cannot flow in, recovering BOG in the LNG buffer tanks to the LNG storage tank by using a BOG recovery compressor, so that the pressure in the LNG buffer tanks is reduced, and the continuity of feed liquid is ensured; stopping feeding liquid when the liquid level in the LNG buffer tank meets the requirement, recycling BOG in the LNG storage tank into the LNG buffer tank by utilizing a BOG recycling compressor, and lifting the pressure in the LNG buffer tank to the air-filling pressure; the LNG tanks can be filled and pressurized one by one according to the step method; in the LNG buffer tank filling process, the LNG storage tank can be pressurized through the storage tank pressurizing gasifier;
(2) Precooling of LNG dispenser: opening a valve on a passage pipeline of one LNG buffer tank, the LNG dispenser and the LNG storage tank, conveying LNG in the LNG buffer tank to the LNG dispenser by using pressure difference, circulating the LNG, and returning the LNG to the LNG storage tank, thereby pre-cooling the LNG dispenser, and when the pressure in the LNG buffer tank is lower in the pre-cooling process, recycling BOG in the LNG storage tank to the LNG buffer tank by using a BOG recycling compressor, so that the pressure of the LNG buffer tank is increased; when the liquid level of the LNG buffer tank is lower in the precooling process, switching precooling of the LNG dispenser from the liquid supply of the LNG buffer tank to the liquid supply of the other LNG buffer tank, and simultaneously supplementing LNG to the LNG buffer tank;
(3) Filling an LNG dispenser: opening a valve on a pipeline between one of the LNG buffer tanks and the LNG dispenser, conveying the LNG in the LNG buffer tank to the LNG dispenser by using pressure difference, metering the LNG, and then feeding the LNG into the LNG vehicle-mounted bottle, and when the pressure of the LNG buffer tank is lower in the filling process, recycling the BOG in the LNG storage tank into the LNG buffer tank by using a BOG recycling compressor, so that the pressure of the LNG buffer tank is increased; when the liquid level of the LNG buffer tank in the filling process is lower, the filling of the LNG vehicle-mounted bottle is switched from the liquid supply of the LNG buffer tank to the liquid supply of another LNG buffer tank, and meanwhile the first LNG buffer tank is supplemented with LNG through the LNG storage tank.
The beneficial effects of the invention are as follows: according to the LNG filling station technology, the LNG immersed pump is replaced by the low-temperature BOG recovery compressor and the LNG buffer tank, so that the problems that the LNG storage tank is evacuated at a low liquid level and the LNG immersed pump is difficult to meet the use pressure under certain conditions can be avoided.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
example 1 novel LNG filling station
The novel LNG filling station shown in fig. 1 mainly comprises an LNG tank car 1, an LNG storage tank 2, an LNG filling machine 3, a storage tank pressurizing gasifier 4, a unloading pressurizing gasifier 5, a BOG recovery compressor 6 and two LNG buffer tanks 7, wherein the BOG recovery compressor 6 is a low-temperature recovery compressor. The LNG tank 2 is connected with the tank pressurizing gasifier 4 through a pipeline, the LNG tank wagon 1 is provided with a liquid unloading port, a gas phase port and a pressurizing port, and the pressurizing port and the gas phase port are connected with the unloading pressurizing gasifier 5 through respective pipelines.
The LNG tank wagon 2 is connected with the LNG tank wagon 1 through a liquid inlet main pipe 8 and a gas pipeline 9, the liquid inlet main pipe 8 is connected with a liquid discharging port of the LNG tank wagon 1, the gas pipeline 9 is connected with a gas phase port of the LNG tank wagon 1, the liquid inlet main pipe 8 is communicated with the gas pipeline 9 through a branch pipe 10, the liquid inlet main pipe 8 is branched into two liquid inlet branch pipes 11 connected with the LNG tank wagon 2, and manual valves and pneumatic valves are arranged on the two liquid inlet branch pipes 11. The gas phase ports of the LNG storage tank 2, the BOG recovery compressor 6 and the LNG tank car 1 are sequentially communicated through pipelines, so that BOG in the LNG storage tank 2 can enter the LNG tank car 1 through the BOG recovery compressor 6.
The two LNG buffer tanks 7 are connected in parallel with the LNG storage tank 2 through pipelines, each LNG buffer tank 7 is respectively communicated with the BOG recovery compressor 6 and the LNG storage tank 2 through different pipelines in sequence to form a forward passage and a reverse passage, BOG in the LNG buffer tank 7 enters the LNG storage tank 2 through the BOG recovery compressor 6 in the forward passage, and BOG in the LNG storage tank 2 enters the LNG buffer tank 7 through the BOG recovery compressor 6 in the reverse passage; each LNG buffer tank 7 is also respectively communicated with the LNG dispenser 3 and the LNG storage tank 2 in sequence through pipelines.
The LNG storage tank 2 is provided with a pressure sensor 12 and a liquid level sensor 13, and the pipeline between the LNG buffer tank 7 and the BOG recovery compressor 6 and the pipeline between the LNG storage tank 2 and the LNG buffer tank 7 are provided with temperature sensors 14. And check valves are arranged on pipelines among the liquid inlet main pipe 8, the LNG buffer tank 7 and the LNG dispenser 3.
Valves are arranged on the pipelines to realize the selection of LNG or BOG circulation lines in different working states, and the valves mainly comprise: a first manual valve 15a is provided in the pipeline between the pressurization port of the LNG tank car 1 and the unloading pressurization gasifier 5. A second manual valve 15b, a fifth manual valve 15e, and a fourth pneumatic valve 16d are provided in this order on the gas pipe 9 from the end near the LNG tank car 1 to the end near the LNG tank 2. A third manual valve 15c and a third check valve 17c are arranged on the liquid inlet header pipe 8 in sequence from one end close to the LNG tank car 1 to one end close to the LNG storage tank 2. The two liquid inlet branch pipes 11 are respectively provided with a second pneumatic valve 16b and a third pneumatic valve 16c, and the liquid inlet branch pipe 11 is also provided with a manual valve. A fourth manual valve 15d is provided on the branch pipe 10. A thirteenth pneumatic valve 16m is provided in a pipe between the fourth pneumatic valve 16d and the inlet of the BOG recovery compressor 6, a fourteenth pneumatic valve 16n is provided in a pipe connecting the thirteenth pneumatic valve 16m and the outlet of the BOG recovery compressor 6, a seventh manual valve 15g is provided in a pipe connecting the gas pipe 9 and the inlet of the BOG recovery compressor 6, and a sixth manual valve 15f is provided in a pipe connecting the gas pipe 9 and the outlet of the BOG recovery compressor 6. A first pneumatic valve 16a is arranged on a main pipeline between the LNG storage tank 2 and the two LNG buffer tanks 7, the main pipeline is branched into branch pipeline which is respectively connected with the two LNG buffer tanks 7, a fifth pneumatic valve 16e and a ninth pneumatic valve 16i are respectively arranged on the two branch pipeline, a tenth pneumatic valve 16j and a second one-way valve 17b are sequentially arranged on a pipeline between the first LNG buffer tank 7a and the LNG dispenser 3, and a sixth pneumatic valve 16f and a first one-way valve 17a are sequentially arranged on a pipeline between the second LNG buffer tank 7b and the LNG dispenser 3. A seventh pneumatic valve 16g is provided in the pipe between the second LNG buffer tank 7b and the inlet of the BOG recovery compressor 6, and an eighth pneumatic valve 16h is provided in the pipe between the outlet of the BOG recovery compressor 6 and the second LNG buffer tank 7 b. An eleventh pneumatic valve 16k is provided in a pipe between the first LNG buffer tank 7a and the inlet of the BOG recovery compressor 6, a twelfth pneumatic valve 16l is provided in a pipe between the outlet of the BOG recovery compressor 6 and the first LNG buffer tank 7a, and a fifteenth pneumatic valve 16o is provided in a pipe between the LNG tank 2 and the tank booster gasifier 4. Example 2 working method of novel LNG filling station
The operation of the novel LNG fueling station of embodiment 1 mainly comprises: LNG unloading, LNG filling, LNG tank pressurization, etc. (default each tank root valve is in an open state). The main working method steps of the novel LNG filling station of the embodiment 1 are as follows:
1. LNG unloading:
(1) Self-balancing: according to the liquid temperature in the LNG tank car 1, selecting which valves are opened, if the liquid temperature is higher than a set value, opening a fifth manual valve 15e, a second manual valve 15b and a fourth pneumatic valve 16d, and if the liquid temperature is lower than the set value, opening a third manual valve 15c, a fourth manual valve 15d and a fourth pneumatic valve 16d, so that BOG in the LNG tank 2 enters the LNG tank car 1 through a pipeline, on one hand, the pressure in the LNG tank 2 is reduced, and on the other hand, the pressure in the LNG tank car 1 is increased; (2) recovery: after the self-balancing is finished, closing a fifth manual valve 15e, opening a sixth manual valve 15f and a thirteenth pneumatic valve 16m, and recycling the BOG in the LNG storage tank 2 into the LNG tank car 1 by using a low-temperature BOG recycling compressor, so as to further reduce the pressure in the LNG storage tank 2 and increase the pressure in the LNG tank car 1; (3) self-pressurization: the first manual valve 15a and the second manual valve 15b are opened to gasify LNG in the LNG tank wagon 1 into the tank wagon pressurizer, so that the tank wagon self-pressurization is realized; (4) unloading: when the pressure in the LNG tank wagon 1 is higher, the third manual valve 15c, the second pneumatic valve 16b and the third pneumatic valve 16c are opened, and the LNG in the LNG tank wagon 1 flows into the LNG storage tank 2, so that unloading is realized. In the unloading process, the LNG tank wagon 1 is pressurized: in the unloading process, in order to maintain the pressure in the LNG tank car 1, on one hand, the first manual valve 15a and the second manual valve 15b are opened, then the unloading pressurizing gasifier 5 is used for realizing the tank car self-pressurizing, on the other hand, the sixth manual valve 15f, the fourth pneumatic valve 16d and the thirteenth pneumatic valve 16m are opened, and the BOG in the LNG storage tank 2 is recovered to the LNG tank car 1 by using the low-temperature BOG recovery compressor. (5) After unloading is completed, the second manual valve 15b and the seventh manual valve 15g are opened, and the BOG remaining in the LNG tank car 1 is introduced into the LNG tank 2 through the fourteenth pneumatic valve 16 n.
2. LNG filling:
(1) The first LNG buffer tank 7a is filled and pressurized
1) The first LNG buffer tank 7a is empty-tank-filled: the first and ninth pneumatic valves 16a and 16i are opened, and the pressure in the LNG tank 2 is high, so that LNG in the LNG tank 2 flows into the first LNG buffer tank 7a, and when the LNG in the LNG tank 2 cannot flow further due to the high pressure in the first LNG buffer tank 7a, the fourth, eleventh and fourteenth pneumatic valves 16d and 16k are opened, and the BOG in the first LNG buffer tank 7a is recovered into the LNG tank 2 by the low-temperature BOG recovery compressor, so that the pressure in the first LNG buffer tank 7a is reduced to ensure the continuity of the feed liquid. When the liquid level in the first LNG buffer tank 7a meets the requirement, the first pneumatic valve 16a and the ninth pneumatic valve 16i are closed, the fourth pneumatic valve 16d, the twelfth pneumatic valve 16l and the thirteenth pneumatic valve 16m are opened, the BOG in the LNG storage tank 2 is recovered into the first LNG buffer tank 7a by using the low-temperature BOG recovery compressor, and the pressure in the first LNG buffer tank 7a is raised to the air-filling pressure.
2) The first LNG buffer tank 7a is charged during operation: the fourth, eleventh and fourteenth air valves 16d, 16k and 16n are opened, the BOG in the first LNG buffer tank 7a is recovered into the LNG tank 2 by the low-temperature BOG recovery compressor, the pressure in the first LNG buffer tank 7a is reduced, and when the pressure is lower than the pressure in the LNG tank 2, the first and ninth air valves 16a, 16i are opened, and the pressure in the LNG tank 2 is high, so that LNG in the LNG tank 2 flows into the first LNG buffer tank 7a. When the liquid level in the first LNG buffer tank 7a meets the requirement, the first pneumatic valve 16a and the ninth pneumatic valve 16i are closed, the fourth pneumatic valve 16d, the twelfth pneumatic valve 16l and the thirteenth pneumatic valve 16m are opened, the BOG in the LNG storage tank 2 is recovered into the first LNG buffer tank 7a by using the low-temperature BOG recovery compressor, and the pressure in the first LNG buffer tank 7a is raised to the air-filling pressure.
(2) The second LNG buffer tank 7b is filled and pressurized
1) The second LNG buffer tank 7b is empty-tank-filled: the first pneumatic valve 16a and the fifth pneumatic valve 16e are opened, and the pressure in the LNG tank 2 is high, so that the LNG in the LNG tank 2 flows into the second LNG buffer tank 7b, and when the LNG in the LNG tank 2 cannot flow further due to the high pressure in the second LNG buffer tank 7b, the fourth pneumatic valve 16d, the seventh pneumatic valve 16g and the fourteenth pneumatic valve 16n are opened, and the BOG in the second LNG buffer tank 7b is recovered into the LNG tank 2 by the low-temperature BOG recovery compressor, so that the pressure in the second LNG buffer tank 7b is reduced to ensure the continuity of the feed liquid. When the liquid level in the second LNG buffer tank 7b meets the requirement, the first pneumatic valve 16a and the fifth pneumatic valve 16e are closed, the fourth pneumatic valve 16d, the eighth pneumatic valve 16h and the thirteenth pneumatic valve 16m are opened, the BOG in the LNG storage tank 2 is recovered into the second LNG buffer tank 7b by using the low-temperature BOG recovery compressor, and the pressure in the second LNG buffer tank 7b is raised to the air-filling pressure.
2) The second LNG buffer tank 7b is charged during operation: the fourth, seventh and fourteenth air valves 16d, 16g and 16n are opened, the BOG in the second LNG buffer tank 7b is recovered into the LNG tank 2 by the low-temperature BOG recovery compressor, the pressure in the second LNG buffer tank 7b is reduced, and when the pressure is lower than that in the LNG tank 2, the first and fifth air valves 16a and 16e are opened, and the pressure in the LNG tank 2 is high, so that LNG in the LNG tank 2 flows into the first LNG buffer tank 7a. When the liquid level in the second LNG buffer tank 7b meets the requirement, the first pneumatic valve 16a and the fifth pneumatic valve 16e are closed, the fourth pneumatic valve 16d, the eighth pneumatic valve 16h and the thirteenth pneumatic valve 16m are opened, the BOG in the LNG storage tank 2 is recovered into the second LNG buffer tank 7b by using the low-temperature BOG recovery compressor, and the pressure in the second LNG buffer tank 7b is raised to the air-filling pressure.
In the process, when the pressure in the LNG storage tank 2 needs to be increased, the fifteenth pneumatic valve 16o is opened, and the LNG in the LNG storage tank 2 flows into the storage tank pressurizing gasifier 4, so that the self-pressurization of the storage tank is realized.
(3) Precooling the LNG dispenser 3: when the LNG dispenser 3 is precooled, the second pneumatic valve 16b and the tenth pneumatic valve 16j are opened, and as the pressure of the first LNG buffer tank 7a is higher than that of the LNG storage tank 2, the LNG in the first LNG buffer tank 7a is conveyed to the LNG dispenser 3 by using the pressure difference and then returns to the bottom of the LNG storage tank 2 after being circulated, so that the LNG dispenser 3 is precooled, when the pressure of the first LNG buffer tank 7a is lower in the precooling process, the fourth pneumatic valve 16d, the twelfth pneumatic valve 16l and the thirteenth pneumatic valve 16m are opened, and the BOG in the LNG storage tank 2 is recovered into the first LNG buffer tank 7a by using the low-temperature BOG recovery compressor, so that the pressure of the first LNG buffer tank 7a is increased. When the liquid level of the first LNG buffer tank 7a is lower in the precooling process, the sixth pneumatic valve 16f is opened, the tenth pneumatic valve 16j is closed at the same time, the precooling of the LNG dispenser 3 is switched from the liquid supply of the first LNG buffer tank 7a to the liquid supply of the second LNG buffer tank 7b, and the first LNG buffer tank 7a is supplemented with LNG by the method 1). When the pressure or the liquid level of the second LNG buffer tank 7b is low, switching is performed in accordance with the operation mode in which the first LNG buffer tank 7a has a problem, and so on. And the double buffer tanks are utilized to ensure the continuity of the precooling of the LNG dispenser 3.
(4) And filling the LNG dispenser 3: similar to the precooling mode of the LNG dispenser 3, when the LNG dispenser 3 is filled with air, the second pneumatic valve 16b and the tenth pneumatic valve 16j are opened, as the pressure of the first LNG buffer tank 7a is higher than that of the LNG vehicle-mounted bottle, the LNG in the first LNG buffer tank 7a is conveyed into the LNG dispenser 3 by using the pressure difference and then enters the LNG vehicle-mounted bottle, so that the LNG vehicle-mounted bottle is filled, when the pressure of the first LNG buffer tank 7a is lower in the filling process, the fourth pneumatic valve 16d, the twelfth pneumatic valve 16l and the thirteenth pneumatic valve 16m are opened, and the BOG in the LNG storage tank 2 is recovered into the first LNG buffer tank 7a by using the low-temperature BOG recovery compressor, so that the pressure of the first LNG buffer tank 7a is improved. When the liquid level of the first LNG buffer tank 7a is low during the filling process, the sixth pneumatic valve 16f is opened, and the tenth pneumatic valve 16j is closed at the same time, so that the filling of the LNG in-vehicle bottle is switched from the liquid supply of the first LNG buffer tank 7a to the second LNG buffer tank 7b, and the LNG is replenished to the first LNG buffer tank 7a by the previous method. When the pressure or the liquid level of the second LNG buffer tank 7b is low, switching is performed in accordance with the operation mode in which the first LNG buffer tank 7a has a problem, and so on. And the double buffer tanks are utilized to ensure the continuous filling of the LNG vehicle-mounted bottle.
Liquid level, pressure and temperature sensors detect and control operation in a linkage manner in the operation process of each process flow.
Claims (8)
1. The utility model provides a novel LNG gas station, includes LNG tank wagon, LNG storage tank, LNG dispenser, storage tank booster gasifier, unloads the car booster gasifier, the LNG storage tank passes through the pipeline connection storage tank booster gasifier, be provided with on the LNG tank wagon and unload liquid mouth, gas phase mouth, booster mouth, the booster mouth and gas phase mouth are respectively through pipeline connection unloading booster gasifier, its characterized in that: the system also comprises a BOG recycling compressor and a plurality of LNG buffer tanks;
the LNG tank is connected with the LNG tank wagon through a liquid inlet main pipe and a gas pipeline, the liquid inlet main pipe is connected with the liquid discharging port, the gas pipeline is connected with a gas phase port of the LNG tank wagon, the liquid inlet main pipe and the gas pipeline are communicated through branch pipes, and the LNG tank, the BOG recovery compressor and the gas phase port of the LNG tank wagon are sequentially communicated through pipelines, so that BOG in the LNG tank can enter the LNG tank wagon through the BOG recovery compressor;
the LNG buffer tanks are connected with the LNG storage tank in parallel through pipelines, each LNG buffer tank is respectively communicated with the BOG recovery compressor and the LNG storage tank through different pipelines to form a forward passage and a reverse passage, BOG in the LNG buffer tank in the forward passage enters the LNG storage tank through the BOG recovery compressor, and BOG in the LNG storage tank in the reverse passage enters the LNG buffer tank through the BOG recovery compressor; each LNG buffer tank is also communicated with the LNG dispenser and the LNG storage tank in sequence through pipelines;
valves are arranged on the pipelines to realize the selection of LNG or BOG circulation lines in different working states.
2. The novel LNG fueling station of claim 1 wherein: the valves on the pipelines are manual valves and/or pneumatic valves.
3. The novel LNG fueling station of claim 1 wherein: the number of the LNG buffer tanks is two.
4. The novel LNG fueling station of claim 1 wherein: the liquid inlet main pipe branches into two liquid inlet branch pipes connected with the LNG storage tank, and the two liquid inlet branch pipes are provided with a manual valve and a pneumatic valve.
5. The novel LNG fueling station of claim 1 wherein: the BOG recovery compressor is a low temperature recovery compressor.
6. The novel LNG fueling station of claim 1 wherein: be provided with pressure sensor and level sensor on the LNG storage tank, be provided with temperature sensor on the pipeline between LNG buffer tank and the BOG recovery compressor and on the pipeline between LNG storage tank and the LNG buffer tank.
7. The novel LNG fueling station of claim 1 wherein: and one-way valves are arranged on pipelines among the liquid inlet main pipe, the LNG buffer tank and the LNG dispenser.
8. A method of operating a new LNG fueling station as claimed in any one of claims 1 to 7, wherein: the method comprises the following steps:
1. LNG unloading:
(1) Self-balancing: opening a valve on a gas pipeline between the LNG storage tank and the LNG tank wagon, so that BOG in the LNG storage tank enters the LNG tank wagon through the pipeline; (2) recovery: after self-balancing is completed, valves of the LNG storage tank-BOG recovery compressor-LNG tank wagon passages are opened, and other valves are closed, so that BOG in the LNG storage tank is recovered into the LNG tank wagon through the BOG recovery compressor, the pressure in the LNG storage tank is further reduced, and the pressure in the LNG tank wagon is increased; (3) self-pressurization: the LNG tank wagon is self-pressurized by utilizing the unloading pressurizing gasifier; (4) unloading: when the pressure in the LNG tank wagon reaches a set value, a valve on the liquid inlet main pipe is opened to enable LNG in the LNG tank wagon to flow into the LNG storage tank, and unloading is achieved; in the unloading process, the LNG tank wagon is pressurized through an unloading pressurizing gasifier or BOG in the LNG storage tank is recovered to the LNG tank wagon by using a BOG recovery compressor to realize pressurization;
2. LNG filling:
(1) LNG buffer tank filling and pressurization: opening a valve on a pipeline between the LNG storage tank and one of the LNG buffer tanks to enable LNG in the LNG storage tank to flow into the LNG buffer tanks, and when the pressure in the LNG buffer tanks is higher than the pressure in the LNG storage tank and the LNG cannot flow in, recovering BOG in the LNG buffer tanks to the LNG storage tank by using a BOG recovery compressor, so that the pressure in the LNG buffer tanks is reduced, and the continuity of feed liquid is ensured; stopping feeding liquid when the liquid level in the LNG buffer tank meets the requirement, recycling BOG in the LNG storage tank into the LNG buffer tank by utilizing a BOG recycling compressor, and lifting the pressure in the LNG buffer tank to the air-filling pressure; filling and pressurizing the LNG buffer tanks one by one according to the step method; in the LNG buffer tank filling process, the LNG storage tank is pressurized through the storage tank pressurizing gasifier;
(2) Precooling of LNG dispenser: opening a valve on a passage pipeline of one LNG buffer tank, the LNG dispenser and the LNG storage tank, conveying LNG in the LNG buffer tank to the LNG dispenser by using pressure difference, circulating the LNG, and returning the LNG to the LNG storage tank, thereby pre-cooling the LNG dispenser, and when the pressure in the LNG buffer tank is lower in the pre-cooling process, recycling BOG in the LNG storage tank to the LNG buffer tank by using a BOG recycling compressor, so that the pressure of the LNG buffer tank is increased; when the liquid level of the LNG buffer tank is lower in the precooling process, switching precooling of the LNG dispenser from the liquid supply of the LNG buffer tank to the liquid supply of the other LNG buffer tank, and simultaneously supplementing LNG to the LNG buffer tank;
(3) Filling an LNG dispenser: opening a valve on a pipeline between one of the LNG buffer tanks and the LNG dispenser, conveying the LNG in the LNG buffer tank to the LNG dispenser by using pressure difference, metering the LNG, and then feeding the LNG into the LNG vehicle-mounted bottle, and when the pressure of the LNG buffer tank is lower in the filling process, recycling the BOG in the LNG storage tank into the LNG buffer tank by using a BOG recycling compressor, so that the pressure of the LNG buffer tank is increased; when the liquid level of the LNG buffer tank in the filling process is lower, the filling of the LNG vehicle-mounted bottle is switched from the liquid supply of the LNG buffer tank to the liquid supply of another LNG buffer tank, and meanwhile the first LNG buffer tank is supplemented with LNG through the LNG storage tank.
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| CN108799825B (en) * | 2018-09-03 | 2024-04-09 | 张家港富瑞深冷科技有限公司 | LNG tank container filling system |
| CN111306440B (en) * | 2018-12-12 | 2022-02-01 | 张家港中集圣达因低温装备有限公司 | Liquid discharge metering device |
| CN112460476A (en) * | 2019-09-09 | 2021-03-09 | 安瑞科(廊坊)能源装备集成有限公司 | LNG filling device and filling method |
| CN112460474A (en) * | 2019-09-09 | 2021-03-09 | 安瑞科(廊坊)能源装备集成有限公司 | LNG filling device and filling method |
| CN110736026A (en) * | 2019-10-24 | 2020-01-31 | 邳州亚联环保科技有限公司 | residual liquid recycling system |
| CN110792925B (en) * | 2019-11-15 | 2022-01-28 | 辽宁忠旺集团有限公司 | Self-pressurization gas supply system and gas supply method |
| CN111336403B (en) * | 2020-03-30 | 2021-09-21 | 日照市海达尔能源装备科技股份有限公司 | Filling method of micro-power-consumption low-temperature liquid filling system |
| CN111457246B (en) * | 2020-04-01 | 2021-12-17 | 江苏国富氢能技术装备股份有限公司 | Hydrogen storage type hydrogen filling station |
| US20230160533A1 (en) * | 2021-11-23 | 2023-05-25 | L'air Liquide, Societe Anonyme Pour L'etude Et L?Exploitation Des Procedes Georges Claude | Liquid hydrogen trailer loading procedure for hydrogen and refrigeration recovery |
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