CN217004028U - BOG recovery system of liquid hydrogen storage equipment - Google Patents
BOG recovery system of liquid hydrogen storage equipment Download PDFInfo
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- CN217004028U CN217004028U CN202220798346.0U CN202220798346U CN217004028U CN 217004028 U CN217004028 U CN 217004028U CN 202220798346 U CN202220798346 U CN 202220798346U CN 217004028 U CN217004028 U CN 217004028U
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Abstract
The utility model discloses a BOG recovery system of liquid hydrogen storage equipment, which comprises: the system comprises liquid hydrogen storage equipment, an air-temperature gasifier, a hydrogen compressor and a heat exchange recovery system. The air-temperature vaporizer is connected to a liquid hydrogen storage device to raise the temperature of the BOG flowing therethrough. The hydrogen compressor is connected with the air-temperature gasifier to pressurize the BOG flowing through. The heat exchange recovery system comprises a cold box and at least one stage of refrigeration cycle assembly, wherein the air inlet end of the cold box is connected with a hydrogen compressor, the liquid outlet end of the cold box is connected with a liquid hydrogen storage device, and the at least one stage of refrigeration cycle assembly provides cold energy for the cold box. According to the BOG recovery system provided by the embodiment of the utility model, BOG in the liquid hydrogen storage equipment can be liquefied and recovered, the utilization rate of liquid hydrogen is high, the storage loss of liquid hydrogen is effectively reduced, and cost reduction and efficiency improvement are realized.
Description
Technical Field
The utility model relates to the technical field of new energy development, in particular to a BOG recovery system of liquid hydrogen storage equipment.
Background
The hydrogen energy is used as clean energy, provides reliable assistance for the development of the field of new energy automobiles, and particularly provides favorable support for the development of fuel cell automobiles.
In the related art, it is often necessary to supply hydrogen gas required for a fuel cell vehicle by transporting or storing a large amount of liquid hydrogen. In the process of storing liquid hydrogen in the liquid hydrogen storage tank, the static evaporation rate of the liquid hydrogen storage tank can reach 0.50%/d generally, and the liquid hydrogen can be kept liquefied at an extremely low temperature, so that the liquid hydrogen is extremely easy to gasify, and more BOG (Boil-Off Gas, BOG for short) is formed in the liquid hydrogen storage tank, and if the BOG leaks or remains in the liquid hydrogen storage tank, the BOG cannot be used for subsequent filling of a fuel cell automobile, and is not easy to be effectively used by the fuel cell automobile, so that the utilization rate of the liquid hydrogen in the liquid hydrogen storage tank is reduced, and the large-scale effective use of hydrogen fuel is hindered.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention is directed to provide a BOG recovery system for a liquid hydrogen storage device, which can recycle BOG, re-liquefy BOG to liquid hydrogen for reuse, reduce cost, improve efficiency, and improve the utilization rate of liquid hydrogen.
In order to achieve the purpose, the technical scheme of the utility model is realized as follows:
a BOG recovery system for a liquid hydrogen storage device, comprising: a liquid hydrogen storage device; the air temperature type gasifier is connected with the liquid hydrogen storage device to increase the temperature of the BOG flowing through; the hydrogen compressor is connected with the air-temperature gasifier to pressurize the flowing BOG; the heat exchange recovery system comprises a cold box and at least one stage of refrigeration cycle assembly, wherein the air inlet end of the cold box is connected with the hydrogen compressor, the liquid outlet end of the cold box is connected with the liquid hydrogen storage device, and the refrigeration cycle assembly provides cold for the cold box.
According to the BOG recovery system of the liquid hydrogen storage equipment, the temperature of the BOG flowing out of the liquid hydrogen storage equipment can be increased through the air-temperature gasifier; the hydrogen compressor further pressurizes the BOG to a reasonable pressure and volume range for heat exchange; the BOG that will have the hydrogen of certain temperature, certain pressure and volume is cooled down effectively by heat transfer recovery system finally for BOG accomplishes the liquefaction and forms liquid hydrogen, and carry again and recycle in transporting to liquid hydrogen storage facilities, has promoted the availability ratio of liquid hydrogen, effectively reduces the storage loss of liquid hydrogen, has realized cost reduction and benefit.
In addition, the BOG recovery system of the liquid hydrogen storage device according to the above embodiment of the present invention may further have the following additional technical features:
according to some embodiments of the utility model, the refrigeration cycle assembly comprises a liquid nitrogen refrigeration assembly comprising a liquid nitrogen supply source and a liquid nitrogen delivery conduit through which liquid nitrogen in the liquid nitrogen supply source is delivered into the cold box to refrigerate the cold box.
According to some embodiments of the utility model, the refrigeration cycle assembly comprises a helium refrigeration assembly; the helium refrigeration assembly comprises a helium supply source, a helium compressor and an expansion machine, the helium supply source supplies helium to the helium compressor, the helium compressor compresses the helium and then conveys the compressed helium to the expansion machine, and high-pressure helium in the expansion machine expands to do work to refrigerate the cold box.
Optionally, the helium refrigeration assembly further comprises an oil removal assembly, and the oil removal assembly is connected with the helium compressor and the helium supply source through a first pipeline assembly; the cold box is connected with the helium compressor and the oil removal assembly through a second pipeline assembly; the oil removal assembly can remove oil from helium flowing through.
According to some embodiments of the utility model, the BOG recovery system of the liquid hydrogen storage device further comprises a cooling assembly and a vacuum pump unit, the vacuum pump unit is used for providing a required vacuum degree for the cold box, and the cooling assembly exchanges heat for the vacuum pump unit and/or the helium gas compressor.
According to some embodiments of the utility model, the BOG recovery system of the liquid hydrogen storage device further comprises a throttle valve disposed at the liquid outlet end of the cold box to further cool and liquefy the BOG refrigerated by the helium refrigeration assembly into liquid hydrogen.
According to some embodiments of the utility model, the BOG recovery system of the liquid hydrogen storage apparatus further comprises a hydrogen buffer tank provided between the air-temperature gasifier and the hydrogen compressor.
According to some embodiments of the present invention, the BOG recovery system of the liquid hydrogen storage apparatus further comprises a pressure regulating valve provided between the hydrogen compressor and the cold box, the pressure regulating valve regulating pressure for hydrogen gas flowing therethrough; and/or the liquid hydrogen storage equipment is arranged between the liquid hydrogen storage equipment and the cold box, so that the liquid hydrogen flowing through the cold box is opened when the liquid hydrogen meets the preset temperature.
According to some embodiments of the utility model, the air-temperature gasifier adjusts the temperature of the BOG flowing therethrough to a normal temperature.
According to some embodiments of the utility model, the BOG recovery system of the liquid hydrogen storage device further comprises a safety valve connected to the liquid hydrogen storage device to deliver BOG in the liquid hydrogen storage device to the air-temperature vaporizer when the liquid hydrogen storage device reaches a preset pressure threshold.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic diagram of a BOG recovery system of a liquid hydrogen storage apparatus according to the present invention, in which arrows indicate the flow directions of respective media.
Reference numerals:
1000. a BOG recovery system of the liquid hydrogen storage device;
101. a liquid hydrogen storage device;
100. an air-temperature gasifier;
200. a hydrogen buffer tank; 210. a flow regulating valve;
300. a hydrogen compressor; 310. a pressure dividing valve;
410. a pressure regulating valve; 420. a temperature regulating valve;
500. a heat exchange recovery system;
510. cooling the box;
520. a liquid nitrogen refrigeration component; 521. a liquid nitrogen supply source; 522. a liquid nitrogen delivery pipe;
530. a helium refrigeration component; 531. a helium gas supply; 532. an oil removal assembly; 533. a helium gas compressor;
534. a first gas path; 535. a first mixed oil gas circuit; 536. a second mixed oil gas circuit;
537. a third gas path; 538. a fourth gas path;
610. a cooling assembly; 620. a vacuum pump assembly.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The utility model will be described in detail below with reference to the drawings attached to the specification and embodiments.
As shown in fig. 1, a BOG recovery system 1000 of a liquid hydrogen storage apparatus 101 includes: the system comprises a liquid hydrogen storage device 101, an air-temperature gasifier 100, a hydrogen compressor 300 and a heat exchange recovery system 500.
The air-temperature gasifier 100 is connected to a liquid hydrogen storage device 101 to raise the temperature of the BOG flowing therethrough. It should be noted that the liquid hydrogen storage device 101 can store low-temperature liquid hydrogen (for example, the temperature is-253 ℃ to-233 ℃), and the liquid hydrogen storage device 101 generates a certain amount of BOG along with the storage time, and the temperature of the BOG is also low, which is not favorable for recycling, while the air-temperature gasifier 100 can rapidly raise the temperature of the BOG, which is convenient for subsequent processing.
It should be further noted that the liquid hydrogen storage device 101 may be at least one of a liquid hydrogen storage tank, a liquid hydrogen pipeline, a liquid hydrogen ship, a liquid hydrogen vehicle, and a liquid hydrogen tank, and the BOG recycling system 1000 of the present application may be used in any situation where liquid hydrogen needs to be stored.
The hydrogen compressor 300 is connected to the air-heated gasifier 100 to pressurize the flowing BOG, thereby increasing the pressure and reducing the volume of the flowing BOG, and facilitating the subsequent heat exchange process.
The heat exchange and recovery system 500 comprises a cold box 510 and at least one stage of refrigeration cycle component, wherein the air inlet end of the cold box 510 is connected with the hydrogen compressor 300, the liquid outlet end of the cold box 510 is connected with the liquid hydrogen storage device 101, and the at least one stage of refrigeration cycle component provides cold for the cold box 510.
As can be seen from the above structure, in the BOG recovery system 1000 of the liquid hydrogen storage device 101 according to the embodiment of the present invention, the air-temperature gasifier 100 can raise the temperature of the BOG flowing out of the liquid hydrogen storage device 101, and the BOG absorbs heat, so as to prevent the BOG from being too low in temperature to be effectively processed when flowing through the subsequent processing device, and maintain the operating temperature of the hydrogen compressor 300 within an effective range.
The hydrogen compressor 300 further pressurizes the BOG to a pressure and volume within a reasonable range for heat exchange, which facilitates further transportation and subsequent processing.
The BOG that will have the uniform temperature finally by heat transfer recovery system 500, the BOG of the hydrogen of certain pressure and volume is taken in to cold box 510, the BOG is effectively cooled down by the cold volume that refrigeration cycle subassembly provided, make the BOG constantly absorb cold volume and cool down, finally reduce to the liquefaction temperature and accomplish the liquefaction, thereby change physical form and form liquid hydrogen, liquid hydrogen transports again to liquid hydrogen storage device 101 after flowing out from cold box 510 and carries out recycle, thereby BOG's recycle has been accomplished, the availability ratio of liquid hydrogen has been promoted, effectively reduce liquid hydrogen's storage loss, cost reduction and benefit increase has been realized.
Compared with the prior art that BOG in the liquid hydrogen storage tank is not processed or is allowed to leak, the BOG recovery system 1000 of the liquid hydrogen storage device 101 has the advantages of high liquid hydrogen utilization rate, cost reduction, efficiency improvement and safe liquid hydrogen use.
Here, the liquid hydrogen storage apparatus 101, the air temperature gasifier 100, the hydrogen compressor 300, and the heat exchange recovery system 500 may be connected by pipes or gas paths, as long as BOG can be effectively transferred between the apparatuses.
In some embodiments of the present invention, as shown in fig. 1, the refrigeration cycle assembly comprises a liquid nitrogen refrigeration assembly 520, the liquid nitrogen refrigeration assembly 520 comprises a liquid nitrogen supply source 521 and a liquid nitrogen delivery pipe 522, and liquid nitrogen in the liquid nitrogen supply source 521 is delivered into the cold box 510 through the liquid nitrogen delivery pipe 522 to refrigerate the cold box 510. In these examples, liquid nitrogen supply 521 may provide liquid nitrogen having a lower temperature and pass into cold box 510 through liquid nitrogen delivery conduit 522 to exchange heat with the BOG in cold box 510 to cool the BOG, while the temperature of the liquid nitrogen is raised to form nitrogen gas to rapidly cool the BOG. The nitrogen is a component in the air, so the nitrogen after temperature rise can be discharged into the air without further recovery, the space required by the liquid nitrogen refrigeration component 520 required to be arranged is saved, and the equipment cost required for recovering the nitrogen is reduced.
In other examples, the nitrogen recovery line may be provided to collect the heated nitrogen again, lower the temperature of the collected nitrogen, liquefy the collected nitrogen, and use the liquefied nitrogen as the liquid nitrogen supply source 521.
Optionally, the liquid nitrogen supply source 521 is a liquid nitrogen tank, or a liquid nitrogen supply pool, and the liquid nitrogen tank is convenient to replace; and the content of the liquid nitrogen in the liquid nitrogen supply pool is sufficient, so that the liquid nitrogen supply source 521 can continuously supply the liquid nitrogen with the required temperature to provide sufficient cold energy for the cold box 510.
In order to save the liquid nitrogen usage amount of the liquid nitrogen refrigeration assembly 520, the liquid nitrogen refrigeration assembly 520 can be used as a preliminary pre-cooling assembly and as a first-stage refrigeration circulation assembly.
In some embodiments of the present invention, the refrigeration cycle assembly comprises a helium refrigeration assembly 530, and the helium refrigeration assembly 530 can be used alone as a primary refrigeration cycle assembly or in combination with the liquid nitrogen refrigeration assembly 520 as a secondary refrigeration cycle assembly.
As shown in fig. 1, the helium refrigeration assembly 530 includes a helium supply 531, a helium compressor 533 and an expander (not shown in the figure), the helium supply 531 supplies helium to the helium compressor 533, the helium compressor 533 compresses the helium to form high-pressure helium, the high-pressure helium is delivered to the expander, and the high-pressure helium in the expander expands to work as cold box 510 for refrigeration, so that the BOG in the cold box 510 absorbs cold energy and is cooled down efficiently.
Alternatively, the helium supply 531 may be replaced with a helium storage tank.
Since the helium compressor 533 needs to be lubricated by using lubricant during operation, so that the helium compressor 533 can work normally, and since part of the lubricant is mixed during the helium gas flowing through the helium compressor 533 and being compressed, it is necessary to separate the helium gas from the lubricant before the high-pressure helium gas is delivered to the cold box 510. Since helium is a rare gas, which is stable in properties, but relatively expensive, it is necessary to recycle helium so that the helium can be recycled after providing cold energy to the cold box 510, which requires efficient separation of helium from lubricant oil when the helium is recycled to the helium supply.
Therefore, the helium refrigeration assembly 530 of the present invention further comprises an oil removal assembly 532, wherein the oil removal assembly 532 is connected to the helium compressor 533 and the helium supply source 531 through a first pipeline assembly, so that when helium needs to be recovered, the oil removal assembly 532 can effectively separate helium flowing through from lubricating oil, and only helium returns to the helium supply source 531; when helium needs to be delivered to the helium compressor 533, part of the lubricating oil carried by the helium passes through the oil removing assembly 532 and enters the helium compressor 533 together, so that the helium is compressed and the helium compressor 533 is lubricated reliably.
Optionally, the first pipeline assembly comprises a first gas path 534 for delivering helium from the helium supply 531 to the oil removing assembly 532, a first mixed oil gas path 535 for delivering helium and delivering lubricating oil from the oil removing assembly 532 to the helium compressor 533, a second mixed oil gas path 536 for delivering high-pressure helium and delivering lubricating oil from the helium compressor 533 to the oil removing assembly 532, and a second gas path for recovering helium from the oil removing assembly 532 to the helium supply 531, so that helium can be delivered to the helium compressor 533 and effectively compressed, and helium can be removed by the oil removing assembly 532 during recovery.
Optionally, the second conduit assembly includes a third gas path 537 for delivering high pressure helium gas from the oil removal assembly 532 to the cold box 510, and a fourth gas path 538 for delivering high temperature helium gas that has been expanded to perform work from the cold box 510 to the helium compressor 533. Therefore, the helium can be effectively recycled after work is done in the expansion machine, and the next helium cooling is convenient to carry out. Meanwhile, the helium passing through the helium compressor 533 can be returned to the oil removing assembly 532 through the aforementioned second mixed oil gas path 536 to remove oil again, and then returned to the helium supply 531 through the second gas path for reuse.
In other examples, the second gas path in the above examples may be omitted, and the first gas path may be used as a gas path for conveying helium from the helium supply source 531 to the oil removing assembly 532, and a gas path for recovering helium from the oil removing assembly 532 to return separated helium to the helium supply source 531.
In a specific example, when the cold box 510 needs helium to provide cold, helium with a certain purity in the helium supply source 531 is conveyed towards the oil removal component 532 through the first gas path 534, helium with a certain amount of lubricating oil is conveyed into the helium compressor 533 through the first mixed oil gas path 535, helium in the helium compressor 533 is compressed and then enters the oil removal component 532 through the second mixed oil gas path 536 to remove oil, and then high-pressure helium is conveyed into the expansion machine of the cold box 510 through the third gas path 537, and the expansion machine performs expansion work on the high-pressure helium, so that the cold box 510 is refrigerated. After the cooling box 510 finishes cooling, the air with increased temperature returns to the helium compressor 533 through the fourth gas path 538 from the cooling box 510 again for compression, the helium gas and the lubricating oil with certain pressure in the helium compressor 533 returns to the oil removing assembly 532 through the second mixed oil gas path 536 for oil-gas separation, and then the helium gas is recovered and stored in the helium gas supply source 531 from the first gas path 534 (or the second gas path additionally arranged), so that the helium gas is recovered and utilized.
In some embodiments of the present invention, the BOG recovery system 1000 of the liquid hydrogen storage device 101 further includes a cooling module 610 and a vacuum pump unit 620, where the vacuum pump unit 620 is configured to provide a required vacuum degree to the cold box 510, so as to form a closed space in the cold box 510, facilitate heat exchange of gases such as hydrogen BOG, helium, nitrogen, and the like, and facilitate movement of the gases in each air cavity along a preset direction. The cooling efficiency of the BOG is prevented from being lowered by heat absorption of the cold box 510 itself.
The vacuum pump unit 620 can continuously generate heat in the working process, so that reasonable cooling needs to be performed on the vacuum pump unit 620 in order to ensure the working stability of the vacuum pump unit 620, at the moment, the cooling component 610 is arranged to exchange heat for the vacuum pump unit 620, and the vacuum pump unit 620 can always work in a reasonable working range by continuously dissipating heat of the cooling component 610 to the vacuum pump unit 620, so that the working temperature of the vacuum pump unit 620 is ensured to be proper.
Advantageously, to further enhance the utility of the cooling assembly 610 and the stability of the operation of the helium refrigeration assembly 530, the cooling assembly 610 of the present invention can exchange heat with the helium compressor 533 to maintain the operating temperature of the helium compressor 533 within a reasonable range.
Optionally, the cooling assembly 610 may select a water cooling assembly and/or an air cooling assembly, which is not limited herein. The water cooling assembly delivers cooling water to the helium compressor 533 or the vacuum pump unit 620, so as to absorb heat generated by the helium compressor 533 or the vacuum pump unit 620, and thus the helium compressor 533 or the vacuum pump unit 620 is cooled. The air cooling assembly can continuously blow low-temperature air to the helium compressor 533 or the vacuum pump unit 620, so that high-temperature air around the helium compressor 533 or the vacuum pump unit 620 is taken away, and heat dissipation is achieved.
In some embodiments of the present invention, the BOG recovery system 1000 of the liquid hydrogen storage device 101 further includes a throttle valve (not shown in the drawings), the throttle valve is disposed at the liquid outlet end of the cold box 510, and the pressure becomes lower and the temperature further decreases when the volume of the throttled BOG is not changed, so that the BOG cooled by the helium cooling component 530 is further cooled and liquefied into liquid hydrogen. Then, the throttle valve here may further serve as a three-stage refrigeration cycle component. The throttle valve will cause the BOG to perform Joule-Thomson expansion to further lower the temperature, and finally the temperature of the liquid hydrogen flowing out of the cold box 510 can reach approximately-253 to-233 ℃, so that the liquid hydrogen can be well fused with the liquid hydrogen in the original hydrogen storage device 101 when returning to the liquid hydrogen storage device 101, and the temperature can be prevented from being greatly fluctuated.
In some embodiments of the present invention, as shown in fig. 1, the BOG recovery system 1000 of the liquid hydrogen storage apparatus 101 further includes a hydrogen buffer tank 200, the hydrogen buffer tank 200 is disposed between the air-temperature gasifier 100 and the hydrogen compressor 300, and the hydrogen buffer tank 200 can store the BOG heated by the air-temperature gasifier 100, so that more BOG is collected in the hydrogen buffer tank 200 and then is delivered to the hydrogen compressor 300, so that the hydrogen compressor 300 can process more BOG at one time, the processing efficiency of the hydrogen compressor 300 is improved, and the BOG flowing through the hydrogen compressor 300 can be ensured to be more stable in property, which is convenient for centralized processing.
Optionally, as shown in fig. 1, the BOG recovery system 1000 of the liquid hydrogen storage device 101 further includes a flow regulating valve 210, and the flow regulating valve 210 can regulate the outlet flow of the hydrogen buffer tank 200, so as to facilitate control of the flow rate and the flow rate of the BOG flowing to the hydrogen compressor 300.
Optionally, as shown in fig. 1, the BOG recovery system 1000 of the liquid hydrogen storage apparatus 101 further includes a partial pressure valve 310, and the partial pressure valve 310 is connected in parallel to the hydrogen compressor 300, so that the pressure of the BOG and the amount of the BOG entering the hydrogen compressor 300 can be adjusted.
In some embodiments of the present invention, as shown in fig. 1, the BOG recovery system 1000 of the liquid hydrogen storage device 101 further includes a pressure regulating valve 410, the pressure regulating valve 410 is disposed between the hydrogen compressor 300 and the cold box 510, and the pressure regulating valve 410 regulates pressure for the hydrogen flowing through, so that the pressure of the BOG before entering the main air intake pipeline of the cold box 510 is moderate, and the subsequent refrigeration heat exchange treatment is facilitated. In some specific examples, the inlet pressure through the cold box 510 is 1.1 MPa.
Optionally, as shown in fig. 1, the BOG recovery system 1000 of the liquid hydrogen storage apparatus 101 further includes a temperature adjusting valve 420, where the temperature adjusting valve 420 is disposed between the liquid hydrogen storage apparatus 101 and the cold box 510 to be opened when the flowing-through liquid hydrogen meets a preset temperature, in these examples, when the temperature does not meet the preset temperature during the liquid hydrogen backflow, the temperature adjusting valve 420 is kept closed, the liquid hydrogen after temperature reduction cannot flow back into the liquid hydrogen storage apparatus 101, and the liquid hydrogen with the temperature that is not met is effectively prevented from flowing back into the liquid hydrogen storage apparatus 101 to cause a large fluctuation in the temperature of the liquid hydrogen in the raw liquid hydrogen storage apparatus 101. At this time, the temperature of the liquid hydrogen formed after heat exchange can be adjusted within a preset range by adjusting the amount of cold energy provided by each stage of refrigeration cycle component in the heat exchange recovery system 500 and the amount of BOG required for heat exchange.
Optionally, the liquid hydrogen with unqualified temperature can further flow back to the cold box 510 through a return line for refrigeration; or collecting the liquid hydrogen with unqualified temperature, and cooling to the required temperature again after a certain amount of liquid hydrogen is collected.
In some embodiments of the present invention, as shown in fig. 1, in the BOG recovery system 1000 of the liquid hydrogen storage apparatus 101, the air-temperature gasifier 100 adjusts the temperature of the flowing BOG to normal temperature, that is, the air-temperature gasifier 100 may be placed indoors, and the temperature of the flowing BOG is reduced to normal temperature by using the room temperature, without the cooperation of other cooling components, thereby effectively improving the primary processing efficiency of the BOG and reducing the processing cost of the BOG.
Optionally, the air-temperature gasifier 100 is a finned heat exchanger, and has a large heat exchange area and good heat exchange efficiency.
In some embodiments of the present invention, the BOG recovery system 1000 of the liquid hydrogen storage apparatus 101 further includes a safety valve (not shown) connected to the liquid hydrogen storage apparatus 101, so that when the liquid hydrogen storage apparatus 101 reaches a preset pressure threshold, the BOG in the liquid hydrogen storage apparatus 101 is delivered to the air-temperature gasifier 100. That is to say, the liquid hydrogen of the liquid hydrogen storage device 101 itself has a certain evaporation rate, so when BOG is continuously generated in the liquid hydrogen storage device 101 and the pressure of the liquid hydrogen storage device 101 is continuously increased to a certain pressure, it is necessary to release the pressure as soon as possible, and the amount of the BOG at this time has reached a higher degree. The frequent operation or low-load operation of the air-temperature gasifier 100, the hydrogen compressor 300 and the heat exchange recovery system 500 is effectively prevented.
In other examples, of course, instead of the safety valve, a gas pressure sensor and a switching valve may be used, the gas pressure sensor and the switching valve are connected to the liquid hydrogen storage device 101, and when the gas pressure sensor detects that the BOG gas pressure in the liquid hydrogen storage device 101 reaches a preset threshold value, the switching valve opens the exhaust pipe of the liquid hydrogen storage device 101, so that the BOG is exhausted toward the air-temperature vaporizer 100.
To ensure the regasification of the liquid hydrogen of the present application, the purity of the liquid hydrogen in the liquid hydrogen storage apparatus 101 should be maintained within a high purity threshold. For example, in some specific examples, the purity of the liquid hydrogen may be greater than 99%, and even as high as 99.9999%.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A BOG recovery system (1000) for a liquid hydrogen storage device (101), comprising:
a liquid hydrogen storage device (101);
an air-temperature gasifier (100) connected to the liquid hydrogen storage device (101) to increase the temperature of the BOG flowing therethrough;
a hydrogen compressor (300) connected to the air-heated gasifier (100) to pressurize the BOG flowing therethrough;
the heat exchange and recovery system (500) comprises a cold box (510) and at least one stage of refrigeration circulation assembly, the air inlet end of the cold box (510) is connected with the hydrogen compressor (300), the liquid outlet end of the cold box (510) is connected with the liquid hydrogen storage device (101), and the refrigeration circulation assembly at least one stage of refrigeration circulation assembly provides cold energy for the cold box (510).
2. The BOG recovery system (1000) of the liquid hydrogen storage device (101) according to claim 1, wherein the refrigeration cycle assembly comprises a liquid nitrogen refrigeration assembly (520), the liquid nitrogen refrigeration assembly (520) comprises a liquid nitrogen supply source (521) and a liquid nitrogen delivery pipe (522), and liquid nitrogen in the liquid nitrogen supply source (521) is delivered into the cold box (510) through the liquid nitrogen delivery pipe (522) to refrigerate the cold box (510).
3. The BOG recovery system (1000) of a liquid hydrogen storage plant (101) according to claim 1 or 2, wherein the refrigeration cycle assembly comprises a helium refrigeration assembly (530);
the helium refrigeration assembly (530) comprises a helium supply source (531), a helium compressor (533) and an expansion machine, the helium supply source (531) supplies helium to the helium compressor (533), the helium compressor (533) compresses the helium and then conveys the compressed helium to the expansion machine, and high-pressure helium in the expansion machine expands to do work to refrigerate the cold box (510).
4. The BOG recovery system (1000) of the liquid hydrogen storage facility (101) of claim 3, wherein the helium refrigeration assembly (530) further comprises a de-oiling assembly (532), the de-oiling assembly (532) connecting the helium compressor (533) and the helium supply (531) via a first piping assembly; the cold box (510) is connected with the helium compressor (533) and the oil removal assembly (532) through a second pipeline assembly; the oil removal assembly (532) can remove oil from helium gas flowing through.
5. The BOG recovery system (1000) of the liquid hydrogen storage facility (101) of claim 3, further comprising a cooling assembly (610) and a vacuum pump unit (620), wherein the vacuum pump unit (620) is configured to provide a required vacuum level to the cold box (510), and wherein the cooling assembly (610) exchanges heat with the vacuum pump unit (620) and/or the helium compressor (533).
6. The BOG recovery system (1000) of a liquid hydrogen storage facility (101) of claim 3, further comprising a throttle valve disposed at the liquid outlet end of the cold box (510) to further cool and liquefy BOG refrigerated by the helium refrigeration assembly (530) to liquid hydrogen.
7. The BOG recovery system (1000) of the liquid hydrogen storage facility (101) of claim 1, further comprising a hydrogen buffer tank (200), the hydrogen buffer tank (200) being disposed between the air-temperature gasifier (100) and the hydrogen compressor (300).
8. The BOG recovery system (1000) of a liquid hydrogen storage facility (101) according to claim 1, further comprising a pressure regulating valve (410), the pressure regulating valve (410) being provided between the hydrogen compressor (300) and the cold box (510), the pressure regulating valve (410) regulating pressure for hydrogen flowing therethrough; and/or the presence of a gas in the atmosphere,
the liquid hydrogen storage device is characterized by further comprising a temperature regulating valve (420), wherein the temperature regulating valve (420) is arranged between the liquid hydrogen storage device (101) and the cold box (510) and is opened when the flowing liquid hydrogen meets a preset temperature.
9. The BOG recovery system (1000) of the liquid hydrogen storage facility (101) of claim 1, wherein the air-temperature gasifier (100) regulates the temperature of the flowing BOG to normal temperature.
10. The BOG recovery system (1000) of the liquid hydrogen storage device (101) of claim 1, further comprising a safety valve connected to the liquid hydrogen storage device (101) to deliver BOG in the liquid hydrogen storage device (101) to the air temperature vaporizer (100) when the liquid hydrogen storage device (101) reaches a preset pressure threshold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220798346.0U CN217004028U (en) | 2022-03-30 | 2022-03-30 | BOG recovery system of liquid hydrogen storage equipment |
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| CN202220798346.0U CN217004028U (en) | 2022-03-30 | 2022-03-30 | BOG recovery system of liquid hydrogen storage equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115507296A (en) * | 2022-08-26 | 2022-12-23 | 中国电建集团华东勘测设计研究院有限公司 | Liquid hydrogen refueling station system for recycling BOG |
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2022
- 2022-03-30 CN CN202220798346.0U patent/CN217004028U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115507296A (en) * | 2022-08-26 | 2022-12-23 | 中国电建集团华东勘测设计研究院有限公司 | Liquid hydrogen refueling station system for recycling BOG |
| CN115507296B (en) * | 2022-08-26 | 2023-11-07 | 中国电建集团华东勘测设计研究院有限公司 | Liquid hydrogen hydrogenation station system for recycling BOG |
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