CN115507296A - Liquid hydrogen refueling station system for recycling BOG - Google Patents
Liquid hydrogen refueling station system for recycling BOG Download PDFInfo
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- CN115507296A CN115507296A CN202211033702.0A CN202211033702A CN115507296A CN 115507296 A CN115507296 A CN 115507296A CN 202211033702 A CN202211033702 A CN 202211033702A CN 115507296 A CN115507296 A CN 115507296A
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- pipeline
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 248
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 248
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 213
- 239000007788 liquid Substances 0.000 title claims abstract description 201
- 238000004064 recycling Methods 0.000 title claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 35
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 35
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 35
- 238000011084 recovery Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 54
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 52
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 27
- 239000001569 carbon dioxide Substances 0.000 claims description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims description 26
- 238000002309 gasification Methods 0.000 claims description 14
- 239000006200 vaporizer Substances 0.000 claims description 3
- 239000013526 supercooled liquid Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
-
- 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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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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 provides a liquid hydrogen hydrogenation station system for recycling BOG, wherein a storage tank is provided with a liquid inlet and a gas outlet, and the liquid hydrogen hydrogenation station system comprises: the BOG precooling pipeline is used for preheating liquid hydrogen before gas hydrogen filling, and the generated cold energy is used for precooling recovered BOG; the reliquefaction pipeline is arranged between the BOG precooling pipeline and the liquid inlet of the storage tank and is used for recovering the liquefaction of the BOG; the BOG pre-cooling pipeline comprises a first BOG recovery branch, and two ends of the BOG pre-cooling pipeline are respectively communicated with the hydrogen pre-cooler and the reliquefaction pipeline and are used for recovering BOG hydrogen generated in the pre-cooling process; two ends of the second BOG recovery branch are respectively communicated with the gas outlet of the storage tank and the reliquefaction pipeline and are used for BOG hydrogen of the liquid hydrogen storage tank for the recycle bin; the liquid hydrogen preheats the branch road, both ends respectively with the liquid hydrogen pump with gas hydrogen filling pipeline intercommunication has solved the technical problem that exists among the prior art is difficult to retrieve BOG completely.
Description
Technical Field
The invention relates to the technical field of hydrogenation stations, in particular to a liquid hydrogen hydrogenation station system for recycling BOG.
Background
Compared with a gas hydrogen refueling station, the liquid hydrogen refueling station has the advantages of high storage and transportation efficiency, low pressure, small safety risk and the like, and is the mainstream development direction of future refueling stations in China. The liquid hydrogen refueling station can produce more boil off hydrogen BOG in the operation process, but the current liquid hydrogen refueling station mainly discharges the hydrogen into the atmosphere through a concentrated diffusion system, so that a large amount of precious hydrogen resources are lost, and the economy of the liquid hydrogen refueling station is seriously reduced. In addition, the explosion limit of hydrogen is low, and a large amount of hydrogen is diffused to have certain potential safety hazard. BOG sources of the liquid hydrogen refueling station mainly comprise two aspects, namely, the temperature and the pressure of a liquid hydrogen storage tank for the station are maintained, the daily evaporation rate is about 0.5-1%, and the BOG source is a relatively stable hydrogen source; and secondly, precooling is performed before the liquid hydrogen pump, the liquid hydrogen pipeline and other equipment are formally operated, and the hydrogen generation amount has certain volatility. At present, partial patents propose a BOG direct pressurization filling method, but because the pressurization is bigger, the pressurization equipment investment is bigger and the operation power consumption is higher, and because BOG flow in the liquid hydrogen hydrogenation station is interrupted unstably, the supercharging equipment operating mode need be adjusted repeatedly, in addition, because the high-pressure gaseous hydrogen storage volume is less relatively, under the condition of not filling for a long time, the complete recovery of BOG is difficult to realize.
Disclosure of Invention
The invention aims to provide a liquid hydrogen refueling station system for recycling BOG, which aims to solve the technical problem that the BOG is difficult to be completely recycled in the prior art.
The invention provides a liquid hydrogen hydrogenation station system for recycling BOG, which comprises a storage tank and a liquid hydrogen pump, wherein the liquid hydrogen pump is respectively communicated with a liquid hydrogen filling pipeline and a gas hydrogen filling pipeline, the liquid hydrogen filling pipeline comprises a liquid hydrogen hydrogenation machine, the gas hydrogen filling pipeline comprises a gasifier, a hydrogen storage cylinder group, a hydrogen precooler and a gas hydrogen hydrogenation machine, the storage tank is provided with a liquid inlet and a gas outlet, and the liquid hydrogen hydrogenation station system comprises: the BOG precooling pipeline is used for preheating liquid hydrogen before gas hydrogen filling, and the generated cold energy is used for precooling recovered BOG; the reliquefaction pipeline is arranged between the BOG precooling pipeline and the liquid inlet (29) of the storage tank and is used for recovering the liquefaction of the BOG; the BOG precooling pipeline comprises: the two ends of the first BOG recovery branch are respectively communicated with the hydrogen precooler and the reliquefaction pipeline and are used for recovering BOG hydrogen generated in the precooling process of the hydrogen precooler; the two ends of the second BOG recovery branch are respectively communicated with the gas outlet of the storage tank and the reliquefaction pipeline and are used for recovering BOG hydrogen of the liquid hydrogen storage tank for the recycle bin; and two ends of the liquid hydrogen preheating branch are respectively communicated with the liquid hydrogen pump and the gas hydrogen filling pipeline.
Further, the reliquefaction pipeline comprises a hydrogen liquefaction cold box and a mixed cooler which are communicated with each other, the hydrogen liquefaction cold box is arranged between the mixed cooler and the liquid inlet of the storage tank, and the mixed cooler is arranged between the liquid hydrogen pump and the liquid hydrogen hydrogenation machine.
Furthermore, the mixing cooler adopts a heat-preservation cold box.
Furthermore, the BOG pre-cooling pipeline sequentially comprises a liquid hydrogen cooler, a liquid nitrogen cooler and a liquid carbon dioxide cooler along the flow direction of gas hydrogen, a liquid nitrogen heat exchange medium is arranged in the liquid nitrogen cooler, and a liquid carbon dioxide heat exchange medium is arranged in the liquid carbon dioxide cooler.
Furthermore, a cold source in the hydrogen liquefaction cold box is a low-temperature cold machine or a hydrogen liquefaction turbine unit.
Further, in the liquid nitrogen cooler and the liquid carbon dioxide cooler, a liquefaction pipeline is provided below the gasification pipeline.
Further, in the liquid nitrogen cooler and the liquid carbon dioxide cooler, heat exchange coils are adopted for the liquefaction pipeline and the gasification pipeline.
Furthermore, the hydrogen storage bottle group is provided with a plurality of groups for storing hydrogen with different high pressures, and the hydrogen storage bottle group is provided with a plurality of hydrogen storage bottles.
Furthermore, a fifth stop valve is arranged between the liquid inlet and the gas outlet.
Further, when the internal pressure of the storage tank is greater than a set pressure value, the fifth cutoff valve automatically opens and exhausts air.
The invention provides a liquid hydrogen hydrogenation station system for recycling BOG, which comprises five-stage sectional cooling of BOG hydrogen generated in a precooling process through a first BOG recycling branch and a reliquefaction pipeline, three-stage sectional cooling of BOG hydrogen from a liquid hydrogen storage tank for a station through a second BOG recycling branch and a reliquefaction pipeline, thermodynamic efficiency of the system is improved through cold quantity gradient utilization, and the BOG is reliquefied by a smaller order of magnitude by using liquid hydrogen gasification cold energy of a larger order of magnitude and cold energy generated by a liquid hydrogen pump.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a liquid hydrogen refueling station system for recovering BOG according to this embodiment.
Icon: 1-liquid hydrogen line; 2-a storage tank; 3-a liquid hydrogen pump; 4-a second shut-off valve; 5-a hybrid cooler; 6-a third cut-off valve; 7-liquid hydrogen hydrogenation machine; 8-a gasification pipeline; 9-a first shut-off valve; 10-liquid hydrogen cooler; 11-liquid nitrogen cooler; 12-a liquid carbon dioxide cooler; 13-an air vaporizer; 14-70MPa high-pressure hydrogen pipe; 15-70MPa hydrogen storage bottle group; 16-a shut-off valve a; a 17-70MPa hydrogen precooler; a hydrogenation machine with the pressure of 18-70 MPa; 19-35MPa high-pressure hydrogen pipe; a hydrogen storage bottle group with 20-35 MPa; 21-a shut-off valve b; a hydrogen precooler at 22-35 MPa; 23-35MPa hydrogenation machine; 24-precooler BOG recovery line; 25-a fourth shut-off valve; 26-a hydrogen liquefaction cold box; 27-a fifth shut-off valve; 28-storage tank BOG recovery pipeline; 29-liquid inlet; and 30-air outlet.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. 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.
The liquid hydrogen station system for recycling BOG provided by the embodiment comprises a liquid hydrogen storage tank 2 and a liquid hydrogen pump 3 which are respectively communicated with a liquid hydrogen filling pipeline and a gas hydrogen filling pipeline. Wherein, the liquid hydrogen filling pipeline comprises a liquid hydrogen hydrogenation machine 7. The gas-hydrogen filling pipeline comprises an air gasifier 13, a hydrogen storage cylinder group, a hydrogen precooler and a gas-hydrogen hydrogenation machine. The liquid hydrogen storage tank 2 is provided with a liquid inlet 29 and a gas outlet 30. The liquid hydrogen refueling station system comprises a BOG precooling pipeline and a reliquefaction pipeline. The reliquefaction line includes the hydrogen liquefaction cold tank 26 and the hybrid cooler 5 in communication with each other. Pipelines and equipment in a liquid hydrogen refueling station system need to be subjected to adiabatic treatment.
The BOG pre-cooling pipeline sequentially comprises a liquid hydrogen cooler 10, a liquid nitrogen cooler 11 and a liquid carbon dioxide cooler 12 along the flow direction of gas hydrogen. The liquid nitrogen cooler 10 and the liquid carbon dioxide cooler 12 are heat exchangers having a cold accumulation effect, a large amount of liquid nitrogen heat exchange medium is filled in the liquid nitrogen cooler 11, and a large amount of liquid carbon dioxide heat exchange medium is filled in the liquid carbon dioxide cooler 12. In the liquid nitrogen cooler 10 and the liquid carbon dioxide cooler 12, the gasification line is provided at an upper portion of the coolers, and the liquefaction line is provided at a lower portion of the coolers. The heat exchange medium in the liquid nitrogen cooler 10 and the liquid carbon dioxide cooler 12 absorbs heat and becomes heat exchange medium steam, and the heat exchange medium steam is positioned at the top of the container of the coolers and exchanges heat with the gasification pipeline arranged at the upper part of the coolers. The heat exchange medium after absorbing the cold energy in the gasification pipeline is changed into heat exchange medium liquid which is deposited at the bottom of the container of the cooler and exchanges heat with the liquefaction pipeline at the lower part of the cooler. The heat exchange medium after absorbing the heat in the liquefaction pipeline becomes heat exchange medium steam again, and can be recycled. Preferably, the gasification pipelines and the liquefaction pipelines in the liquid nitrogen cooler 10 and the liquid carbon dioxide cooler 12 adopt heat exchange coils, and the high-efficiency heat exchange is realized through natural convection driven by temperature difference.
The system of the hydrogenation station comprises four pipelines, namely a storage tank BOG recovery pipeline 28, a precooler BOG recovery pipeline 24, a gasification pipeline 8 and a liquid hydrogen pipeline 1.
In the storage tank BOG recovery pipeline 28, the gas outlet 30 of the storage tank 2 is communicated with the second recovered BOG branch, the reliquefaction pipeline and the liquid inlet 29, and is used for BOG of the liquid hydrogen storage tank 2 for the recycle bin. Wherein the second recovered BOG branch includes a liquid hydrogen cooler 10. BOG of the station liquid hydrogen storage tank 2 is cooled by three stages, and comprises a liquid hydrogen cooler 10, a mixing cooler 5 and a hydrogen liquefaction cold box 26. Specifically, the conduit is led out from an air outlet 30 of the storage tank 2, sequentially communicated with the liquid hydrogen cooler 10, the mixed cooler 5 and the hydrogen liquefaction cold box 26, and finally connected to a liquid inlet 29 of the storage tank 2, and can be used for recycling BOG in the storage tank 2. The storage tank BOG enters the liquid hydrogen cooler 10 to absorb cold energy to complete the precooling process. Then the mixture enters a mixing cooler 5, and is directly contacted and mixed with the liquid hydrogen in the supercooled state after being pressurized by a liquid hydrogen pump 3 in the mixing cooler 5, so that the BOG is further cooled. The hybrid cooler 5 can recover the cold energy of the supercooled liquid hydrogen after being pressurized by the liquid hydrogen pump. The mixing cooler 5 adopts a heat-preservation cold box, which is beneficial to high-efficiency heat exchange. The BOG finally enters a hydrogen liquefaction cold box 26, absorbs cold energy to become liquid hydrogen, and enters the storage tank 2 from a liquid inlet 29 to realize recovery. And a fifth cut-off valve 27 is arranged between the gas outlet 30 and the liquid hydrogen cooler 10, can be regulated according to the pressure in the storage tank 2, and automatically opens the discharge BOG when the internal pressure of the storage tank 2 is greater than a set pressure value.
In the precooler BOG recovery pipeline 24, the hydrogen precooler is communicated with the first recovered BOG branch, the reliquefaction pipeline and the liquid inlet 29 and is used for recovering precooler BOG generated by the hydrogen precooler in the gas hydrogen filling process. The first BOG recovery branch comprises a liquid carbon dioxide cooler 12, a liquid nitrogen cooler 11 and a liquid hydrogen cooler 10. The precooler BOG generated in the precooling process is subjected to five-stage segmented cooling, sequentially comprises a liquid carbon dioxide cooler 12, a liquid nitrogen cooler 11, a liquid hydrogen cooler 10, a mixed cooler 5 and a hydrogen liquefaction cold box 26, and has high thermodynamic efficiency by designing a stepped segmented cooling mode. Specifically, the conduit is led out from the hydrogen precooler and is sequentially communicated with the liquid carbon dioxide cooler 12, the liquid nitrogen cooler 11, the liquid hydrogen cooler 10, the mixing cooler 5 and the hydrogen liquefaction cold box 26, and finally is connected to the liquid inlet 29 of the storage tank 2. The precooler BOG and the storage tank BOG are mixed in the liquid hydrogen cooler 10, and perform preliminary heat exchange with the supercooled liquid hydrogen pressurized by the liquid hydrogen pump 3 in the liquid hydrogen cooler 10. The recovered BOG mixed by the precooler BOG and the storage tank BOG enters the mixed cooler 5 and carries out direct contact type heat exchange with the supercooled liquid hydrogen pressurized by the liquid hydrogen pump 3 in the mixed cooler 5. Liquid hydrogen in the mixed cooler 5 can exchange heat with the recovered BOG in a spraying mode, and the recovered BOG is effectively cooled. The partially liquefied recovered BOG in this stage will remain in the mixing cooler 5 and be fed with liquid hydrogen via the liquid hydrogen hydrogenation unit 7. The residual saturated hydrogen enters the hydrogen liquefaction cold box 26 from the mixing cooler 5, is liquefied after absorbing cold quantity, and finally enters the storage tank 2 from the liquid inlet 29 for storage. The hydrogen liquefaction cold box 26 is used for completing the final cooling liquefaction of the recovered BOG, and ensuring that the recovered BOG entering the storage tank 2 is in a liquefied state. A fourth shut-off valve 25 is provided between the hydrogen pre-cooler and the liquid carbon dioxide cooler 12. The cold source in the hydrogen liquefaction cold box 26 may be a low-temperature cooler or a hydrogen liquefaction turbine unit.
The gas hydrogen filling pipeline provided by the embodiment comprises two groups, namely a 70MPa gas hydrogen filling pipeline and a 35MPa gas hydrogen filling pipeline, which are respectively used for filling 70MPa gas hydrogen and 35MPa gas hydrogen. In the gasification pipeline 8, the storage tank 2 is communicated with the liquid hydrogen pump 3, the liquid hydrogen preheating branch and the gas hydrogen filling pipeline. The liquid hydrogen preheating branch comprises a liquid hydrogen cooler 10, a liquid nitrogen cooler 11 and a liquid carbon dioxide cooler 12. Specifically, the conduit is led out from the storage tank 2, and is sequentially communicated with a liquid hydrogen pump 3, a first cut-off valve 9, a liquid hydrogen cooler 10, a liquid nitrogen cooler 11, a liquid carbon dioxide cooler 12 and an air gasifier 13, and is respectively sequentially communicated with a 70MPa high-pressure hydrogen pipe 14, a 70MPa hydrogen storage cylinder group 15, a cut-off valve a16, a 70MPa hydrogen pre-cooler 17 and a 70MPa hydrogenation machine 18, and a 35MPa high-pressure hydrogen pipe 19 is sequentially communicated with a 35MPa hydrogen storage cylinder group 20, a cut-off valve b21, a 35MPa hydrogen pre-cooler 22 and a 35MPa hydrogenation machine 23. Wherein, the 70MPa hydrogen storage cylinder group 15 and the 35MPa hydrogen storage cylinder group 20 both internally comprise a plurality of high-pressure hydrogen storage cylinders. The air vaporizer 13 may be a finned tube heat exchanger.
In the liquid hydrogen pipeline 1, a guide pipe is led out from the storage tank 2 and is sequentially communicated with a liquid hydrogen pump 3, a second stop valve 4, a mixing cooler 5, a third stop valve 6 and a liquid hydrogen hydrogenation machine 7 to finish the filling of liquid hydrogen.
Because the gasified liquid hydrogen is more than the BOG to be liquefied, the complete recovery of the BOG can be realized under the condition of fully utilizing the cold energy generated by the liquid hydrogen pump 3 and the gasified cold energy of the liquid hydrogen and consuming less external power consumption. The recovered BOG is stored in a liquid hydrogen form, and can meet various filling requirements of liquid hydrogen or high-pressure hydrogen and the like.
Based on the liquid hydrogen refueling station system for recycling BOG provided by the embodiment, assuming that all devices in the system are in a state of being closed or stopped from running, the specific implementation steps include:
s1, opening a second stop valve 4, a third stop valve 6 and a liquid hydrogen pump 3, and when filling liquid hydrogen, enabling the liquid hydrogen in the storage tank 2 to sequentially flow through the liquid hydrogen pump 3, the second stop valve 4, the mixing cooler 5, the third stop valve 6 and the liquid hydrogen hydrogenation machine 7 for filling the liquid hydrogen.
S2, opening a first cut-off valve 9, enabling liquid hydrogen in the storage tank 2 to enter a gasification pipeline 8 through a liquid hydrogen pump 3, enabling the liquid hydrogen to sequentially flow through the first cut-off valve 9, a liquid hydrogen cooler 10, a liquid nitrogen cooler 11, a liquid carbon dioxide cooler 12 and an air gasifier 13 to complete gasification of the liquid hydrogen, storing cold energy into heat exchange media in the liquid nitrogen cooler 11 and the liquid carbon dioxide cooler 12, and enabling the gasified liquid hydrogen to respectively enter a 70MPa high-pressure hydrogen pipe 14 and a 35MPa high-pressure hydrogen pipe 19.
And S3, after entering a 70MPa high-pressure hydrogen pipe 14, the gasified liquid hydrogen firstly enters a 70MPa hydrogen storage cylinder group 15 comprising a plurality of 70MPa hydrogen storage cylinders for short-term storage. When the filling requirement is met, the stop valve a16 and the 70MPa hydrogen precooler 17 are opened, and the 70MPa high-pressure hydrogen sequentially flows through the third stop valve, the 70MPa hydrogen precooler 17 and the 70MPa hydrogenation machine 18 to finish the 70MPa high-pressure hydrogen filling.
After entering a 35MPa high-pressure hydrogen pipe 19, the gasified liquid hydrogen firstly enters a 35MPa hydrogen storage cylinder group 20 for short-term storage, and when filling requirements exist, a shut-off valve b21 and a 35MPa hydrogen precooler 22 are opened. The 35MPa high-pressure hydrogen sequentially flows through a shut-off valve b21, a 35MPa hydrogen precooler 22 and a 35MPa hydrogenation machine 23, and the 35MPa high-pressure hydrogen filling is completed.
And S4, opening the fourth stop valve 25 and the fifth stop valve 27, and starting the hydrogen liquefaction cold box 26. BOG that produces in the storage tank passes through fifth trip valve 27 and communicates with liquid hydrogen cooler 10, hybrid cooler 5, hydrogen liquefaction cold box 26 in proper order, finally inserts the inlet 29 of storage tank 2, realizes the recovery of BOG in the storage tank 2. Precooler BOG produced in the precooling process is communicated with the liquid carbon dioxide cooler 12, the liquid nitrogen cooler 11, the liquid hydrogen cooler 10, the mixed cooler 5 and the hydrogen liquefaction cold box 26 in sequence through a fourth cut-off valve 25, and is finally connected to a liquid inlet 29 of the storage tank 2, so that the BOG of the precooler is recovered.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a retrieve BOG's liquid hydrogen hydrogenation station system, includes storage tank (2) and liquid hydrogen pump (3), liquid hydrogen pump (3) respectively with liquid hydrogen filling pipeline and gas hydrogen filling pipeline intercommunication, wherein, liquid hydrogen filling pipeline includes liquid hydrogen hydrogenation machine (7), gas hydrogen filling pipeline includes vaporizer (13), hydrogen storage cylinder group, hydrogen precooler and gas hydrogen hydrogenation machine, its characterized in that, be equipped with inlet (29) and gas outlet (30) on storage tank (2), liquid hydrogen hydrogenation station system includes: the BOG precooling pipeline is used for preheating liquid hydrogen before gas hydrogen filling, and the generated cold energy is used for precooling recovered BOG; the reliquefaction pipeline is arranged between the BOG precooling pipeline and the liquid inlet (29) of the storage tank (2) and is used for recovering the liquefaction of the BOG; wherein, BOG precools the pipeline, includes:
a first BOG recovery branch, both ends of which are respectively communicated with the hydrogen precooler and the reliquefaction pipeline, for recovering BOG hydrogen generated in the precooling process of the hydrogen precooler;
-a second recovered BOG branch, the two ends of which are respectively communicated with the gas outlet (30) of the storage tank (2) and the reliquefaction line, for BOG hydrogen of the liquid hydrogen storage tank (2) for the recycle bin;
-a liquid hydrogen preheating branch, both ends of which are respectively communicated with the liquid hydrogen pump (3) and the gas hydrogen filling pipeline.
2. The BOG recovery liquid hydrogen refueling station system as claimed in claim 1, wherein the reliquefaction pipeline comprises a hydrogen liquefaction cold box (26) and a mixing cooler (5) which are communicated with each other, the hydrogen liquefaction cold box (26) is arranged between the mixing cooler (5) and the liquid inlet (29) of the storage tank (2), and the mixing cooler (5) is arranged between the liquid hydrogen pump (3) and the liquid hydrogen hydrotreater (7).
3. The BOG recovery liquid hydrogen hydrogenation station system as claimed in claim 2, wherein the mixing cooler (5) is a heat-insulating cold box.
4. The liquid hydrogen hydrogenation station system for recycling BOG according to claim 1, wherein the BOG pre-cooling pipeline comprises a liquid hydrogen cooler (10), a liquid nitrogen cooler (11) and a liquid carbon dioxide cooler (12) in sequence along the flow direction of gas hydrogen, a liquid nitrogen heat exchange medium is arranged in the liquid nitrogen cooler (11), and a liquid carbon dioxide heat exchange medium is arranged in the liquid carbon dioxide cooler (12).
5. The liquid hydrogen hydrogenation station system for recycling BOG according to claim 1, wherein the cold source in the hydrogen liquefaction cold box (26) is a low temperature refrigerator or a hydrogen liquefaction turbine set.
6. The liquid hydrogen hydrogenation station system for BOG recovery according to claim 1, wherein a liquefaction line is provided below the gasification line in the liquid nitrogen cooler (11) and the liquid carbon dioxide cooler (12).
7. The liquid hydrogen hydrogenation station system for BOG recovery according to claim 6, wherein the liquid nitrogen cooler (11) and the liquid carbon dioxide cooler (12) adopt heat exchange coils for the liquefaction line and the gasification line.
8. The BOG recovery liquid hydrogen refueling station system as claimed in claim 1, wherein the hydrogen storage cylinder group is provided with a plurality of groups for storing hydrogen gas at different high pressures, and the hydrogen storage cylinder group is provided with a plurality of hydrogen storage cylinders.
9. The liquid hydrogen hydrogenation station system for recycling BOG according to claim 1, wherein a fifth shut-off valve (27) is arranged between the liquid inlet (29) and the gas outlet (30).
10. The liquid hydrogen hydrogenation station system for recovering BOG according to claim 9, wherein the fifth cut-off valve (27) automatically opens the vent when the internal pressure of the storage tank (2) is greater than a set pressure value.
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| CN202211033702.0A CN115507296B (en) | 2022-08-26 | 2022-08-26 | Liquid hydrogen hydrogenation station system for recycling BOG |
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