CN113375045A - BOG recycling system and method for liquid hydrogen refueling station - Google Patents
BOG recycling system and method for liquid hydrogen refueling station Download PDFInfo
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- CN113375045A CN113375045A CN202110760667.1A CN202110760667A CN113375045A CN 113375045 A CN113375045 A CN 113375045A CN 202110760667 A CN202110760667 A CN 202110760667A CN 113375045 A CN113375045 A CN 113375045A
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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
- F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed 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
- 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
- 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
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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
- F17C2221/01—Pure fluids
- F17C2221/012—Hydrogen
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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
- F17C2223/0107—Single phase
- F17C2223/0123—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
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0302—Heat exchange with the fluid by heating
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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
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
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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
- F17C2270/0178—Cars
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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
- F17C2270/0184—Fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/45—Hydrogen technologies in production processes
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Abstract
The invention discloses a BOG recycling system and method for a liquid hydrogen refueling station, which comprises a storage tank, a pressurization pipeline, a recovery pipeline, an output pipeline and a hydrogenation machine system, wherein the storage tank is connected with the pressurization pipeline; the pressurizing pipeline is connected with the storage tank, the recovery pipeline is connected with the outlet end of the storage tank, the pressurizing pipeline and the recovery pipeline are respectively connected with the output pipeline, and the output pipeline is connected with the hydrogenation machine system: the recycling pipeline comprises a BOG pipeline switch valve, a BOG air-temperature heater, a BOG compressor, a first hydrogen storage cylinder group and an auxiliary pipeline; the BOG pipeline switching valve is arranged at the inlet end of the recovery pipeline, the BOG air-temperature heater is arranged between the BOG pipeline switching valve and the BOG compressor, and the first hydrogen storage cylinder group is arranged behind the BOG compressor; BOG can be heated, compressed to 20MPa at low pressure and stored in a low-pressure hydrogen storage bottle to be used as low-pressure primary filling in the filling process; compared with a compressor which is compressed to 45MPa, the compression power consumption can be saved by more than 25%, and meanwhile, the equipment investment of the BOG compressor is greatly reduced on the premise of realizing 100% recycling of BOG.
Description
Technical Field
The invention relates to the field of LNG filling, in particular to a BOG recycling system and method for a liquid hydrogen filling station.
Background
With the gradual rise and large-scale application of hydrogen fuel cell vehicles, the construction of hydrogen stations as supporting facilities of hydrogen fuel cell vehicles is also accelerated at present. According to the development of fuel cell automobile routes in China, the main aim is to realize electrification in the traffic field. According to the new energy automobile industry development planning (2021-.
The liquid hydrogen hydrogenation station generally comprises a liquid hydrogen storage tank, a liquid hydrogen booster pump, a liquid hydrogen gasifier, a hydrogen storage container (a storage tank or a bottle group, the same shall apply hereinafter), a hydrogenation machine, a control system and other key modules.
The prior liquid hydrogen hydrogenation station generally pressurizes liquid, then the liquid is naturally vaporized by absorbing heat in ambient air in a medium-pressure vaporizer (a cold recycling device can be added at the upstream of the vaporizer to optimize the cold recycling design), and then hydrogen enters a hydrogen storage container for storage or directly hydrogenates a downstream hydrogen fuel cell vehicle.
For the recycling of BOG in a conventional liquid hydrogen refueling station, the current common practice is as follows:
1. the process adopted by the foreign conventional liquid hydrogen hydrogenation station is that BOG is pressurized to 45MPa, and directly enters a 45MPa medium-pressure hydrogen storage bottle group for storage, and then a hydrogenation machine is filled;
2. research also proposes that BOG of a liquid hydrogen refueling station is collected and cached under low pressure, and the low-pressure hydrogen is used for generating electricity for a fuel cell and converting the electricity into electric energy for application;
however, the above approaches all have drawbacks:
for the method 1, the BOG pressure is usually 0.2-1.0 MPa, the pressure is compressed to 45MPa, the pressure ratio is too large, at least 3 stages of compression are needed, the equipment investment of the compressor is large, the operation power consumption is high, and meanwhile, because the BOG amount is unstable, the actual effective working time of the compressor is short, the high equipment investment is not economical, and the energy consumption is not economical.
For the 2 nd method, the clean BOG recycling and energy comprehensive utilization method is adopted, but the BOG flow in the liquid hydrogen refueling station is discontinuously unstable, the hydrogen flow is small, and the flow is 50m3The BOG amount of the liquid hydrogen storage tank pipe with the water volume is about 0.6% per day, about 18.9kg/d and the power generation amount is about 250kW, for a liquid hydrogen refueling station, for example 1000kg/12h, the electric energy provided by the part is less than 30% of the total operation power consumption of the refueling station, and meanwhile, the economic value of the generated electricity is far lower than that of the consumed hydrogen. Therefore, this method is not economically reasonable.
Disclosure of Invention
Aiming at the problems, the scheme provides a BOG recycling system and method for a liquid hydrogen refueling station. The problem of to the BOG of liquid hydrogen hydrogenation station unable high efficiency, energy-conserving recycle in the current is solved.
The scheme is realized as follows:
a BOG recycling system of a liquid hydrogen refueling station comprises a storage tank, a pressurization pipeline, a recycling pipeline, an output pipeline and a hydrogenation machine system; the pressurizing pipeline is connected with the storage tank, the recovery pipeline is connected with the outlet end of the storage tank, the pressurizing pipeline and the recovery pipeline are respectively connected with the output pipeline, and the output pipeline is connected with the hydrogenation machine system.
Based on the BOG recycling system of the liquid hydrogen refueling station, the recycling pipeline comprises a BOG pipeline switching valve, a BOG air-temperature heater, a BOG compressor, a first hydrogen storage cylinder group and an auxiliary pipeline; the BOG pipeline switch valve is arranged at the inlet end of the recovery pipeline, the BOG air-temperature heater is arranged between the BOG pipeline switch valve and the BOG compressor, and the first hydrogen storage cylinder group is arranged behind the BOG compressor.
Based on the BOG recycling system of the liquid hydrogen refueling station, two ends of the auxiliary pipeline are respectively arranged on a pipeline between the BOG air-temperature heater and the BOG compressor and a pipeline between the BOG compressor and the first hydrogen storage bottle group.
Based on the BOG recycling system of the liquid hydrogen refueling station, the output pipeline comprises a second hydrogen storage bottle group, a third hydrogen storage bottle group, a fourth hydrogen storage bottle group and an output pipe, and the second hydrogen storage bottle group, the third hydrogen storage bottle group and the fourth hydrogen storage bottle group are respectively connected with the pressurizing pipeline;
the second hydrogen storage cylinder group, the third hydrogen storage cylinder group, the fourth hydrogen storage cylinder group and the connecting pipelines of the pressurization pipeline are respectively provided with a pressurization shut-off valve;
the second hydrogen storage bottle group, the third hydrogen storage bottle group and the fourth hydrogen storage bottle group are respectively provided with a filling pipe and a filling cut-off valve with connecting pipelines of a pressurizing pipeline; the output pipe is connected with the hydrogenation machine system.
Based on the BOG recycling system of the liquid hydrogen refueling station, the first hydrogen storage bottle group is provided with the auxiliary output end, and the auxiliary output end is connected with the pressurization pipeline where the second hydrogen storage bottle group or the third hydrogen storage bottle group or the fourth hydrogen storage bottle group is located.
Based on the BOG recycling system of the liquid hydrogen refueling station, the auxiliary output end comprises a BOG refueling pipeline safety valve, a BOG refueling pipeline check valve and a BOG refueling cut-off valve; the BOG filling pipeline safety valve, the BOG filling pipeline check valve and the BOG filling cut-off valve are sequentially arranged along the medium flowing direction of the auxiliary output end.
Based on the BOG recycling system of the liquid hydrogen refueling station, the BOG compressor is a diaphragm type or piston type compressor.
The invention also provides a BOG recycling method of the liquid hydrogen refueling station, which comprises the following specific steps:
the method comprises the following steps: BOG is recovered through a recovery pipeline and stored in a first hydrogen storage cylinder group, and the BOG obtained through recovery is merged into an output pipeline;
step two: during filling, the first hydrogen storage cylinder group is used for carrying out hydrogenation operation to the outside preferentially; then the hydrogenation operation is carried out to the outside through the subsequent hydrogen storage bottle group.
Based on the above BOG recycling method for the liquid hydrogen refueling station, in the second step, when the liquid hydrogen refueling station has a hydrogen gas filling requirement, the hydrogen machine system is started, the first hydrogen storage cylinder group, the second hydrogen storage cylinder group, the third hydrogen storage cylinder group and the fourth hydrogen storage cylinder group are subjected to pressure sequencing, and pressure values from low to high are respectively defined as P1< P2< P3< P4; comparing the pressure difference between P1 and the gas cylinder in the fuel cell vehicle, when the pressure difference is more than 2MPa, starting a BOG filling cut-off valve, performing first-stage filling on the gas cylinder of the fuel cell vehicle through a first hydrogen storage cylinder group, and when the pressure difference between P1 and the gas cylinder in the fuel cell vehicle is less than or equal to 2MPa, closing the BOG filling cut-off valve;
when the pressure difference between the P2 and the gas cylinder of the fuel cell vehicle is more than 2MPa, opening a filling cut-off valve of a second hydrogen storage cylinder group corresponding to the P2, carrying out second-stage filling on the gas cylinder of the fuel cell vehicle, and when the pressure difference between the P2 and the gas cylinder of the fuel cell vehicle is less than or equal to 2MPa, closing the filling cut-off valve of the second hydrogen storage cylinder group;
when the pressure difference between the P3 and the gas cylinder of the fuel cell vehicle is more than 2MPa, a filling stop valve of a third hydrogen storage cylinder group corresponding to the P3 is opened, and third-stage filling is carried out on the gas cylinder of the fuel cell vehicle; when the pressure difference between the P3 and the gas cylinder of the fuel cell vehicle is less than or equal to 2MPa, closing the filling cut-off valve of the third hydrogen storage cylinder group;
when the pressure difference between the P4 and the gas cylinder of the fuel cell vehicle is more than 2MPa, the corresponding fourth hydrogen storage cylinder group filling stop valve is opened, fourth-stage filling is carried out on the gas cylinder of the fuel cell vehicle, and when the pressure of the gas cylinder of the fuel cell vehicle is 35MPa in the filling process, the hydrogenation of the hydrogenation machine system is finished, and all the corresponding filling relevant stop valves are closed.
Compared with the prior art, the invention has the beneficial effects that:
1. the BOG can be stored in the low-pressure hydrogen storage bottle after being heated and compressed to 20MPa at low pressure, and is used as low-pressure primary filling in the filling process; compared with a compressor which is compressed to 45MPa, the compression power consumption can be saved by more than 25%, and meanwhile, the equipment investment of the BOG compressor is greatly reduced on the premise of realizing 100% recycling of BOG.
2. The system can completely recycle BOG in the liquid hydrogen refueling station, and the BOG is compressed to 20MPa by selecting the low-pressure compressor to be stored as a low-pressure filling stage in the filling process. Compared with a medium-pressure compressor, the low-pressure compressor is adopted to compress the gas to 45MPa, the power consumption of the compressor is reduced, the number of stages of the compressor is reduced from three stages to two stages, the operation stability is improved, the cost is greatly reduced, and meanwhile, the optional range of the compressor is greatly expanded (in China, when the outlet pressure of the compressor is 20MPa, the technology is mature, and the low-pressure compressor is applied to a plurality of domestic hydrogen filling stations, so that the type selection is easy).
Drawings
FIG. 1 is a schematic diagram of the overall system of the present invention;
in the figure: 1. a storage tank; 2. a booster line; 3. a recovery line; 4. an output line; 5. a hydrogenator system; 31. a BOG pipeline switching valve; 32. a BOG air temperature type heater; 33. a BOG compressor; 34. a first hydrogen storage cylinder group; 35. a secondary pipeline; 351. a BOG compressor reflux pressure reducing valve; 352. a BOG compressor reflux stop valve; 361. BOG is used for filling a pipeline safety valve; 362. BOG goes to fill the pipeline check valve; 363. BOG is used for filling a stop valve; 41. a second hydrogen storage cylinder group; 42. a third hydrogen storage cylinder group; 43. a fourth hydrogen storage cylinder group; 44. an output pipe; 45. a pressure-increasing cut-off valve; 46. a filling pipe; 47. a filling cut-off valve; 48. the air inlet and outlet cut-off valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example 1
Referring to fig. 1, the present invention provides a technical solution:
a BOG recycling system of a liquid hydrogen refueling station comprises a storage tank 1, a pressurization pipeline 2, a recovery pipeline 3, an output pipeline 44 and a hydrogenation machine system 5; the pressurizing pipeline 2 is connected with the storage tank 1, the recovery pipeline 3 is connected with the outlet end of the storage tank 1, the pressurizing pipeline 2 and the recovery pipeline 3 are respectively connected with an output pipeline 44, and the output pipeline 44 is connected with the hydrogenation machine system 5;
based on the structure, the BOG in the storage tank 1 is recovered through the recovery pipeline 3, and the recovered BOG is utilized and is merged with the output pipeline 44 to be output to the hydrogenation machine system 5; and the recovered BOG is utilized during output, so that 100% recycling of the BOG is realized.
When the device is used, the pressurizing pipeline 2 gradually extracts liquid hydrogen in the storage tank 1 to heat, the heated liquid hydrogen is transmitted to the output pipeline 44, and then evaporated BOG flows back into the storage tank 1 through the gas return pipeline, so that the fixed gas pressure in the storage tank 1 is increased to a certain extent, and in order to ensure the safety of the storage tank 1, the BOG needs to be released; in the scheme, the released BOG is recycled.
The recovery pipeline 3 comprises a BOG pipeline switching valve 31, a BOG air-temperature heater 32, a BOG compressor 33, a first hydrogen storage cylinder group 34 and an auxiliary pipeline 35; the BOG pipeline switching valve 31 is arranged at the inlet end of the recovery pipeline 3, the BOG pipeline switching valve 31 is used for switching on and off the recovery pipeline 3, the BOG air-temperature heater 32 is arranged between the BOG pipeline switching valve 31 and the BOG compressor 33, and the first hydrogen storage bottle group 34 is arranged behind the BOG compressor 33;
the two ends of the auxiliary pipeline 35 are respectively arranged on a pipeline between the BOG air-temperature heater 32 and the BOG compressor 33 and a pipeline between the BOG compressor 33 and the first hydrogen storage cylinder group 34;
based on the structure, the scheme is that the air temperature type heater is arranged at the inlet end of the recovery pipeline 3, the temperature of BOG is raised to be close to the normal temperature, then the BOG (the pressure is about 0.2 MPa-1.0 MPa) is compressed to be at most 20MPa by the low-pressure compressor, and then the BOG is stored in the first hydrogen storage bottle group 34 through the pipeline;
however, since the time of the pressurizing pipeline 2 for extracting the medium from the storage tank 1 is indefinite, the flow rate of the extracted heating is indefinite, which causes the pressure in the storage tank 1 to fluctuate, and since the opening pressure range of the BOG line switching valve 31 is a certain predetermined value, when the pressure value in the storage tank 1 is at a critical value, a situation that the BOG line switching valve 31 is opened and closed may occur, and since in the prior art, the BOG compressor 33 is usually linked with the BOG line switching valve 31, which causes the BOG compressor 33 to be opened and closed when the pressure value in the storage tank 1 is at the critical value of the BOG line switching valve 31, which greatly affects the service life of the BOG compressor 33;
in view of the above problems, the inventor has set the auxiliary line 35 on the original basis, and when the BOG line switching valve 31 is frequently opened and closed, the compressed BOG can be subjected to a backflow self-circulation for a certain period of time through the auxiliary line 35, that is, after the BOG line switching valve 31 is closed, the BOG compressor 33 is not immediately closed, but is subjected to a self-circulation in the auxiliary line 35.
The auxiliary pipeline 35 comprises a BOG compressor backflow pressure reducing valve 351 and a BOG compressor backflow shut-off valve 352, and the BOG compressor backflow pressure reducing valve 351 and the BOG compressor backflow shut-off valve 352 are sequentially arranged on the auxiliary pipeline 35;
when the BOG line switching valve 31 is closed, then hydrogen flows into the line in which the BOG compressor 33 is located through the BOG compressor backflow cutoff valve 352 and the BOG compressor backflow pressure reducing valve 351, and then hydrogen is extracted by the BOG compressor 33, the BOG compressor 33 is operated in a state of a backflow self-circulation,
when the BOG pipeline switching valve 31 is closed, the inlet valve of the first hydrogen storage cylinder group 34 is opened, hydrogen cannot enter, the hydrogen coming out of the BOG compressor 33 can only pass through the auxiliary pipeline 35 and then sequentially flows back to the inlet end of the BOG compressor 33 through the BOG compressor backflow stop valve 352 and the BOG compressor backflow pressure reducing valve 351, backflow self-circulation is achieved, the normally set time length during self-circulation is 20-60 minutes, namely when the BOG pipeline switching valve 31 is closed, the BOG pipeline switching valve is closed after 30 minutes of delay; when the BOG pipeline switching valve 31 is opened again, the BOG compressor 33 enters the state of BOG pressurization of the liquid hydrogen storage tank 1 again; and the BOG (pressure about 0.2MPa to 1.0MPa) is compressed again to a maximum of 20MPa and then stored in the first hydrogen storage cylinder group 34 through a pipeline.
In the scheme, the opening range of the BOG pipeline switching valve 31 is 0.2 MPa-1.0 MPa.
The output pipeline 44 comprises a second hydrogen storage bottle group 41, a third hydrogen storage bottle group 42, a fourth hydrogen storage bottle group 43 and an output pipeline 44, the second hydrogen storage bottle group 41, the third hydrogen storage bottle group 42 and the fourth hydrogen storage bottle group 43 are respectively connected with the pressurization pipeline 2, and the second hydrogen storage bottle group 41, the third hydrogen storage bottle group 42 and the fourth hydrogen storage bottle group 43 are respectively filled through the pressurization pipeline 2;
the connecting pipelines of the second hydrogen storage bottle group 41, the third hydrogen storage bottle group 42, the fourth hydrogen storage bottle group 43 and the pressurization pipeline 2 are respectively provided with a pressurization shut-off valve 45, and the pressurization shut-off valves 45 respectively control the on-off of the pressurization pipelines in which the pressurization shut-off valves are respectively arranged;
the connecting pipelines of the second hydrogen storage bottle group 41, the third hydrogen storage bottle group 42 and the fourth hydrogen storage bottle group 43 and the pressurizing pipeline 2 are respectively provided with a filling pipe 46 and a filling cut-off valve 47, and the filling pipe 46 on each pipeline is communicated with an output pipe 44; the on-off of the pipeline is controlled by a filling cut-off valve 47 on the pipeline.
The output pipe 44 is connected with the hydrogenation machine system 5, and the output of the hydrogenation machine system 5 is carried out through the output pipe 44.
The first hydrogen storage cylinder group 34 is provided with an auxiliary output end which is connected with a pressure increasing pipeline where the second hydrogen storage cylinder group 41 is positioned, and the pressure increasing pipeline where the second hydrogen storage cylinder group 41 is positioned is provided with an air inlet and outlet cut-off valve 48;
the auxiliary output end comprises a BOG filling pipe 46-way safety valve 361, a BOG filling pipe 46-way check valve 362 and a BOG filling stop valve 363; the 46-way safety valve 361 of the BOG filling pipe, the 46-way check valve 362 of the BOG filling pipe and the BOG filling cut-off valve 363 are sequentially arranged along the medium flowing direction of the auxiliary output end;
based on the structure, the low-pressure hydrogen in the first hydrogen storage cylinder group 34 can be used through the auxiliary output end and is output to the outside, namely, 100% recycling of BOG is realized, the whole filling system is not changed greatly, the equipment investment of the BOG compressor 33 is greatly reduced, and great economic benefit can be obtained.
The process adopts an outlet pipe of BOG of a liquid hydrogen storage tank 1, an air temperature type heater is arranged at the downstream, a low pressure compressor is arranged at the downstream outlet, the BOG is compressed to 20MPa and stored in a low pressure hydrogen storage bottle, the hydrogen filling process flow generally adopts graded filling, a low pressure hydrogen storage bottle group is taken as the first grade of graded filling in the filling process, the BOG gas stored in the hydrogen storage bottle group is firstly utilized to carry out pressure equalization on the gas bottle of a fuel battery car, after the pressure in the low pressure hydrogen storage bottle is fully utilized, the gas is extracted from the 45MPa hydrogen storage bottle group in a graded manner, so that the filling process can reach 3-4 grades of graded filling, and the BOG is extracted in time through the hydrogenation process, so that the BOG compressor 33 does not need to increase the pressure of the BOG to more than 20 MPa;
the system can completely recycle BOG in the liquid hydrogen refueling station, and the BOG is compressed to 20MPa by selecting the low-pressure compressor to be stored as a low-pressure filling stage in the filling process. Compared with a medium-pressure compressor, the low-pressure compressor is adopted to compress the gas to 45MPa, the power consumption of the compressor is reduced, the number of stages of the compressor is reduced from three stages to two stages, the operation stability is improved, the cost is greatly reduced, and meanwhile, the optional range of the compressor is greatly expanded (in China, when the outlet pressure of the compressor is 20MPa, the technology is mature, and the low-pressure compressor is applied to a plurality of domestic hydrogen filling stations, so that the type selection is easy).
In the system, the BOG compressor 33 can be a diaphragm compressor or a piston compressor, the piston compressor can be a gas drive compressor or a liquid drive compressor according to the scale of the liquid hydrogen refueling station, and BOG compression is generally two-stage compression.
Example 2
Based on the system of embodiment 1, the embodiment provides a method for recycling BOG in a liquid hydrogen refueling station:
the method comprises the following specific steps:
BOG is recovered through a recovery pipeline and stored in the first hydrogen storage cylinder group 34, and the BOG obtained by recovery is merged into an output pipeline 44;
when a liquid hydrogen refueling station needs to be filled with hydrogen, the hydrogen adding machine system 5 is started, and the first hydrogen storage cylinder group 34, the second hydrogen storage cylinder group 41, the third hydrogen storage cylinder group 42 and the fourth hydrogen storage cylinder group 43 are subjected to pressure sequencing, wherein the pressure values are defined as P1< P2< P3< P4 from low to high respectively
(as defined herein, P1 is the pressure of the first hydrogen storage cylinder group 34, P2 corresponds to the second hydrogen storage cylinder group 41, P3 corresponds to the third hydrogen storage cylinder group 42, and P4 corresponds to the fourth hydrogen storage cylinder group 43);
comparing the pressure difference between P1 and the gas cylinder in the fuel cell vehicle, when the pressure difference is more than 2MPa, starting the BOG to fill the cut-off valve 363, carrying out first-stage filling on the gas cylinder of the fuel cell vehicle through the first hydrogen storage cylinder group 34, and when the pressure difference between P1 and the gas cylinder in the fuel cell vehicle is less than or equal to 2MPa, closing the cut-off valve for BOG to fill;
when the pressure difference between the P2 and the gas cylinder of the fuel cell vehicle is more than 2MPa, the filling cut-off valve 47 of the second hydrogen storage cylinder group 41 corresponding to the P2 is opened, the gas cylinder of the fuel cell vehicle is filled for the second stage, and when the pressure difference between the P2 and the gas cylinder of the fuel cell vehicle is less than or equal to 2MPa, the filling cut-off valve 47 of the second hydrogen storage cylinder group 41 is closed;
when the pressure difference between the P3 and the gas cylinder of the fuel cell vehicle is more than 2MPa, the filling cut-off valve 47 of the third hydrogen storage cylinder group 42 corresponding to the P3 is opened, and the gas cylinder of the fuel cell vehicle is filled in a third stage; when the pressure difference between the P3 and the gas cylinder of the fuel cell vehicle is less than or equal to 2MPa, the filling cut-off valve 47 of the third hydrogen storage cylinder group 42 is closed;
when the pressure difference between the P4 and the gas cylinder of the fuel cell vehicle is more than 2MPa, the corresponding fourth hydrogen storage cylinder group 43 filling cut-off valve 47 is opened, fourth-stage filling is carried out on the gas cylinder of the fuel cell vehicle, and when the pressure of the gas cylinder of the fuel cell vehicle is 35MPa in the filling process, the hydrogenation of the hydrogenation machine system 5 is finished. And the corresponding filling related shut-off valves are all closed.
By the method, BOG can be collected quickly and efficiently, low power consumption can be realized, and 100% recycling can be realized.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a liquid hydrogen hydrogenation station BOG recycle system which characterized in that: the system comprises a storage tank, a pressurization pipeline, a recovery pipeline, an output pipeline and a hydrogenation machine system; the pressurizing pipeline is connected with the storage tank, the recovery pipeline is connected with the outlet end of the storage tank, the pressurizing pipeline and the recovery pipeline are respectively connected with the output pipeline, and the output pipeline is connected with the hydrogenation machine system.
2. The BOG recycling system of the liquid hydrogen refueling station according to claim 1, characterized in that: the recovery pipeline comprises a BOG pipeline switch valve, a BOG air-temperature heater, a BOG compressor, a first hydrogen storage cylinder group and an auxiliary pipeline; the BOG pipeline switch valve is arranged at the inlet end of the recovery pipeline, the BOG air-temperature heater is arranged between the BOG pipeline switch valve and the BOG compressor, and the first hydrogen storage cylinder group is arranged behind the BOG compressor.
3. The BOG recycling system of the liquid hydrogen refueling station according to claim 2, characterized in that: and two ends of the auxiliary pipeline are respectively arranged on a pipeline between the BOG air-temperature heater and the BOG compressor and a pipeline between the BOG compressor and the first hydrogen storage cylinder group.
4. The BOG recycling system of the liquid hydrogen refueling station according to claim 2 or 3, characterized in that: the output pipeline comprises a second hydrogen storage bottle group, a third hydrogen storage bottle group, a fourth hydrogen storage bottle group and an output pipe, and the second hydrogen storage bottle group, the third hydrogen storage bottle group and the fourth hydrogen storage bottle group are respectively connected with the pressurization pipeline;
the second hydrogen storage cylinder group, the third hydrogen storage cylinder group, the fourth hydrogen storage cylinder group and the connecting pipelines of the pressurization pipeline are respectively provided with a pressurization shut-off valve;
the second hydrogen storage bottle group, the third hydrogen storage bottle group and the fourth hydrogen storage bottle group are respectively provided with a filling pipe and a filling cut-off valve with connecting pipelines of a pressurizing pipeline; the output pipe is connected with the hydrogenation machine system.
5. The BOG recycling system of the liquid hydrogen refueling station according to claim 4, characterized in that: the first hydrogen storage bottle group is provided with an auxiliary output end which is connected with a pressure boosting pipeline where the second hydrogen storage bottle group or the third hydrogen storage bottle group or the fourth hydrogen storage bottle group is located.
6. The BOG recycling system of the liquid hydrogen refueling station according to claim 5, characterized in that: the auxiliary output end comprises a BOG filling pipeline safety valve, a BOG filling pipeline check valve and a BOG filling cut-off valve; the BOG filling pipeline safety valve, the BOG filling pipeline check valve and the BOG filling cut-off valve are sequentially arranged along the medium flowing direction of the auxiliary output end.
7. The BOG recycling system of the liquid hydrogen refueling station as claimed in claim 2, 3, 4, 5 or 6, wherein: and the BOG compressor is a diaphragm type or piston type compressor.
8. A recycling method based on the recycling system of claim 6, characterized in that: the method comprises the following specific steps:
the method comprises the following steps: BOG is recovered through a recovery pipeline and stored in a first hydrogen storage cylinder group, and the BOG obtained through recovery is merged into an output pipeline;
step two: during filling, the first hydrogen storage cylinder group is used for carrying out hydrogenation operation to the outside preferentially; then the hydrogenation operation is carried out to the outside through the subsequent hydrogen storage bottle group.
9. The BOG recycling method of the liquid hydrogen refueling station according to claim 8, characterized in that:
in the second step, when the liquid hydrogen refueling station has a hydrogen gas refueling demand, the hydrogen refueling machine system is started, the first hydrogen storage cylinder group, the second hydrogen storage cylinder group, the third hydrogen storage cylinder group and the fourth hydrogen storage cylinder group are subjected to pressure sequencing, and the pressure values from low to high are respectively defined as P1< P2< P3< P4; comparing the pressure difference between P1 and the gas cylinder in the fuel cell vehicle, when the pressure difference is more than 2MPa, starting a BOG filling cut-off valve, performing first-stage filling on the gas cylinder of the fuel cell vehicle through a first hydrogen storage cylinder group, and when the pressure difference between P1 and the gas cylinder in the fuel cell vehicle is less than or equal to 2MPa, closing the BOG filling cut-off valve;
when the pressure difference between the P2 and the gas cylinder of the fuel cell vehicle is more than 2MPa, opening a filling cut-off valve of a second hydrogen storage cylinder group corresponding to the P2, carrying out second-stage filling on the gas cylinder of the fuel cell vehicle, and when the pressure difference between the P2 and the gas cylinder of the fuel cell vehicle is less than or equal to 2MPa, closing the filling cut-off valve of the second hydrogen storage cylinder group;
when the pressure difference between the P3 and the gas cylinder of the fuel cell vehicle is more than 2MPa, a filling stop valve of a third hydrogen storage cylinder group corresponding to the P3 is opened, and third-stage filling is carried out on the gas cylinder of the fuel cell vehicle; when the pressure difference between the P3 and the gas cylinder of the fuel cell vehicle is less than or equal to 2MPa, closing the filling cut-off valve of the third hydrogen storage cylinder group;
when the pressure difference between the P4 and the gas cylinder of the fuel cell vehicle is more than 2MPa, the corresponding fourth hydrogen storage cylinder group filling stop valve is opened, fourth-stage filling is carried out on the gas cylinder of the fuel cell vehicle, and when the pressure of the gas cylinder of the fuel cell vehicle is 35MPa in the filling process, the hydrogenation of the hydrogenation machine system is finished, and all the corresponding filling relevant stop valves are closed.
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