Hydrogen unloading buffer device for hydrogen supply of 30Mpa long tube trailer
By designing a hydrogen unloading buffer device for a 30Mpa long pipe trailer, the hydrogen flow direction is controlled by three pipelines and control valve groups, the problems of slow flow and pressure adaptation during the hydrogen unloading process are solved, and efficient hydrogen transportation and cost reduction are achieved.
Patent Information
- Application Number
- CN202421998085.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-19
AI Technical Summary
The storage pressure of the long-tube trailer is reduced during the hydrogen unloading process, resulting in a slow flow of hydrogen unloading, and the hydrogen cannot be completely discharged. Moreover, ordinary hydrogen refueling stations cannot adapt to the long-tube trailer with a storage pressure of 30Mpa, increasing transportation costs.
A hydrogen unloading buffer device for a 30Mpa long pipe trailer is designed to control the flow direction of hydrogen through three pipelines and control valve groups, including hydrogen inlet pipelines, high-pressure pipelines, low-pressure pipelines and hydrogen supply pipelines. Combined with the buffer bottle group and compressor, hydrogen transportation under different pressure ranges is achieved.
It improves hydrogen unloading efficiency, reduces hydrogen transportation costs, enhances the exhaust capacity of the compressor, reduces vehicle waiting time, and improves filling efficiency.
Smart Images
Figure CN223076736U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hydrogen energy, and particularly relates to a hydrogen unloading buffer device for supplying hydrogen to a 30Mpa long tube trailer. Background Art
[0002] At present, during the process of unloading hydrogen from a long tube trailer to a hydrogen refueling station, the hydrogen in the long tube trailer is usually directly transported to the hydrogen storage tank through a one-way pipeline.
[0003] However, during the hydrogen unloading process, the storage pressure of the long tube trailer gradually decreases, and the hydrogen unloading flow rate gradually slows down. When the storage pressure in the long tube trailer is less than 5Mpa, the remaining hydrogen cannot be discharged, resulting in a decrease in the single - transport hydrogen volume of the trailer, low unloading efficiency, and an increase in the hydrogen transportation cost.
[0004] In addition, ordinary hydrogen refueling stations usually use 20Mpa hydrogen storage tanks, which cannot be adapted to long tube trailers with a storage pressure of 30Mpa. Only trailers with a smaller storage capacity can be used to transport hydrogen, increasing the transportation cost. Summary of the Utility Model
[0005] In order to solve the problems existing in the above - mentioned prior art, the utility model provides a hydrogen unloading buffer device for supplying hydrogen to a 30Mpa long tube trailer. By controlling hydrogen unloading through three different pipelines and a control valve group, a 20Mpa hydrogen storage tank can be adapted to a long tube trailer with a storage pressure of 30Mpa. At the same time, when the storage pressure in the long tube trailer is less than 5Mpa, hydrogen unloading can still continue, improving the single - transport volume of the long tube trailer and reducing the hydrogen transportation cost.
[0006] The specific technical solution adopted by the utility model is as follows:
[0007] A hydrogen unloading buffer device for supplying hydrogen to a 30Mpa long tube trailer, including a hydrogen storage tank. The output end of the hydrogen long tube trailer is connected to the hydrogen storage tank through a hydrogen inlet pipeline. A high - pressure pipeline and a low - pressure pipeline in parallel are also arranged between the hydrogen inlet pipeline and the hydrogen storage tank. A buffer bottle group is connected in series on the high - pressure pipeline. The output ends of the high - pressure pipeline and the low - pressure pipeline are respectively connected to a hydrogen supply pipeline. The output end of the hydrogen supply pipeline is respectively connected to the input end of a compressor and the input end of the hydrogen storage tank. The output end of the compressor is connected to the input end of the buffer bottle group through a compression pipeline.
[0008] A hydrogen unloading cut - off valve is arranged on the hydrogen inlet pipeline. A high - pressure cut - off valve is arranged on the high - pressure pipeline between the hydrogen inlet pipeline and the buffer bottle group. A low - pressure cut - off valve is arranged on the low - pressure pipeline. A hydrogen supply cut - off valve is arranged on the hydrogen supply pipeline. A compression cut - off valve is arranged at the input end of the compressor. A hydrogen storage cut - off valve is arranged at the input end of the hydrogen storage tank.
[0009] The buffer device further includes a purging inlet pipeline and a purging exhaust pipeline. The nitrogen gas tank is connected to the hydrogen supply pipeline through the purging inlet pipeline, and the high-pressure pipeline is connected to the flare stack through the purging exhaust pipeline. A first purging shut-off valve is provided at the output end of the purging inlet pipeline.
[0010] A purging bypass pipeline is also connected between the purging inlet pipeline and the purging exhaust pipeline, and a second purging shut-off valve is provided on the purging bypass pipeline.
[0011] The beneficial effects of the present utility model are as follows:
[0012] 1. The present utility model adds three pipelines and controls the flow direction of hydrogen by means of a control valve group. When the hydrogen storage pressure in the hydrogen tube trailer is 20 - 30 MPa, the hydrogen unloading shut-off valve, high-pressure shut-off valve, hydrogen supply shut-off valve, and hydrogen storage shut-off valve are opened, and the low-pressure shut-off valve and compression shut-off valve are closed. The hydrogen in the hydrogen tube trailer is unloaded into the buffer bottle group through the hydrogen inlet pipeline and the high-pressure pipeline, and the hydrogen in the buffer bottle group is buffered and then input into the hydrogen storage tank along the high-pressure pipeline and the hydrogen supply pipeline;
[0013] When the hydrogen storage pressure in the hydrogen tube trailer is 5 - 20 MPa, the hydrogen unloading shut-off valve, low-pressure shut-off valve, hydrogen supply shut-off valve, and hydrogen storage shut-off valve are opened, and the high-pressure shut-off valve and compression shut-off valve are closed. The hydrogen in the hydrogen tube trailer is directly input into the hydrogen storage tank through the hydrogen inlet pipeline, low-pressure pipeline, and hydrogen supply pipeline;
[0014] When the hydrogen storage pressure in the hydrogen tube trailer is less than 5 MPa, the hydrogen unloading shut-off valve, low-pressure shut-off valve, hydrogen supply shut-off valve, and compression shut-off valve are opened, and the high-pressure shut-off valve and hydrogen storage shut-off valve are closed. At this time, the hydrogen in the hydrogen tube trailer is input into the compressor through the hydrogen inlet pipeline, low-pressure pipeline, and hydrogen supply pipeline for pressurization, and the pressurized hydrogen enters the buffer bottle group through the compression pipeline.
[0015] 2. The present utility model controls hydrogen unloading through three different pipelines and a control valve group. The storage and transportation pressure of the hydrogen tube trailer is increased from 20 Mpa to 30 Mpa, and the transportation cost is reduced by 33%. The unloading pressure of the hydrogen tube trailer is reduced from 5 Mpa to 2 Mpa and lower, and at least 70 kg more hydrogen is unloaded each time, further reducing the hydrogen transportation cost by about 21.9%. The average pressure at the inlet of the hydrogen compressor is increased from 12.5 Mpa to 17.5 Mpa, and the exhaust capacity of the compressor is increased by 40%, which is equivalent to an increase in the filling efficiency at the filling end, reducing the vehicle waiting time, and is conducive to the deeper and longer-term development of the hydrogen storage and transportation industry. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic structural diagram of the present utility model;
[0017] In the attached drawings, 1 is a hydrogen storage tank, 2 is a hydrogen long tube trailer, 3 is a hydrogen inlet pipeline, 4 is a high-pressure pipeline, 5 is a low-pressure pipeline, 6 is a buffer bottle group, 7 is a hydrogen supply pipeline, 8 is a compressor, 9 is a compression pipeline, 10 is a hydrogen unloading stop valve, 11 is a high-pressure stop valve, 12 is a low-pressure stop valve, 13 is a hydrogen supply stop valve, 14 is a compression stop valve, 15 is a hydrogen storage stop valve, 16 is a purging inlet pipeline, 17 is a purging exhaust pipeline, 18 is a nitrogen tank, 19 is a flare tower, 20 is a first purging stop valve, 21 is a purging bypass pipeline, and 22 is a second purging stop valve. Detailed implementation mode
[0018] The present utility model will be further described below in conjunction with the attached drawings and specific embodiments:
[0019] Specific embodiments, such as Figure 1 As shown, the present utility model provides a hydrogen unloading buffer device for supplying hydrogen to a 30 Mpa long tube trailer, which includes a hydrogen storage tank 1. The output end of the hydrogen long tube trailer 2 is connected to the hydrogen storage tank 1 through a hydrogen inlet pipeline 3. A high-pressure pipeline 4 and a low-pressure pipeline 5 in parallel are further arranged between the hydrogen inlet pipeline 3 and the hydrogen storage tank 1. A buffer bottle group 6 is connected in series on the high-pressure pipeline 4. The output ends of the high-pressure pipeline 4 and the low-pressure pipeline 5 are respectively connected to a hydrogen supply pipeline 7. The output end of the hydrogen supply pipeline 7 is respectively connected to the input end of a compressor 8 and the input end of the hydrogen storage tank 1. The output end of the compressor 8 is connected to the input end of the buffer bottle group 6 through a compression pipeline 9.
[0020] A hydrogen unloading stop valve 10 is arranged on the hydrogen inlet pipeline 3. A high-pressure stop valve 11 is arranged on the high-pressure pipeline 4 between the hydrogen inlet pipeline 3 and the buffer bottle group 6. A low-pressure stop valve 12 is arranged on the low-pressure pipeline 5. A hydrogen supply stop valve 13 is arranged on the hydrogen supply pipeline 7. A compression stop valve 14 is arranged at the input end of the compressor 8. A hydrogen storage stop valve 15 is arranged at the input end of the hydrogen storage tank 1.
[0021] During the hydrogen unloading process, the storage pressure of the long tube trailer will gradually decrease, and the hydrogen unloading flow rate will gradually slow down. When the storage pressure in the long tube trailer is less than 5 Mpa, the remaining hydrogen cannot be discharged, resulting in a reduction in the single transport volume of hydrogen by the trailer, low unloading efficiency, and an increase in the hydrogen transportation cost. In addition, ordinary hydrogen refueling stations usually use hydrogen storage tanks 1 with a pressure of 20 Mpa, which cannot be adapted to long tube trailers with a storage pressure of 30 Mpa, and can only use trailers with a smaller storage capacity to transport hydrogen, increasing the transportation cost.
[0022] Therefore, the utility model adds three pipelines and controls the flow direction of hydrogen by means of a control valve group. When the hydrogen storage pressure in the hydrogen tube trailer 2 is 20 - 30 MPa, the hydrogen discharge stop valve 10, the high-pressure stop valve 11, the hydrogen supply stop valve 13 and the hydrogen storage stop valve 15 are opened, the low-pressure stop valve 12 and the compression stop valve 14 are closed, and the hydrogen in the hydrogen tube trailer 2 is discharged into the buffer bottle group 6 through the hydrogen inlet pipeline 3 and the high-pressure pipeline 4. The hydrogen in the buffer bottle group 6 is buffered and then input into the hydrogen storage tank 1 along the high-pressure pipeline 4 and the hydrogen supply pipeline 7;
[0023] When the hydrogen storage pressure in the hydrogen tube trailer 2 is 5 - 20 MPa, the gas discharge stop valve, the low-pressure stop valve 12, the hydrogen supply stop valve 13 and the hydrogen storage stop valve 15 are opened, the high-pressure stop valve 11 and the compression stop valve 14 are closed, and the hydrogen in the hydrogen tube trailer 2 is directly input into the hydrogen storage tank 1 through the hydrogen inlet pipeline 3, the low-pressure pipeline 5 and the hydrogen supply pipeline 7;
[0024] When the hydrogen storage pressure in the hydrogen tube trailer 2 is less than 5 MPa, the gas discharge stop valve, the low-pressure stop valve 12, the hydrogen supply stop valve 13 and the compression stop valve 14 are opened, the high-pressure stop valve 11 and the hydrogen storage stop valve 15 are closed. At this time, the hydrogen in the hydrogen tube trailer 2 is input into the compressor 8 through the hydrogen inlet pipeline 3, the low-pressure pipeline 5 and the hydrogen supply pipeline 7 for pressurization, and the pressurized hydrogen enters the buffer bottle group 6 through the compression pipeline 9.
[0025] By controlling hydrogen discharge through the above pipelines and valve group, the storage and transportation pressure of the hydrogen tube trailer 2 is increased from 20 Mpa to 30 Mpa, the transportation cost is reduced by 33%, the unloading pressure of the hydrogen tube trailer 2 is reduced from 5 Mpa to 2 Mpa and lower, and at least 70 kg more hydrogen is unloaded each time, further reducing the hydrogen transportation cost by about 21.9%; the average pressure at the inlet of the hydrogen compressor 8 is increased from 12.5 Mpa to 17.5 Mpa, and the exhaust capacity of the compressor 8 is increased by 40%, which is equivalent to improving the filling efficiency at the filling end, reducing the vehicle waiting time, and being beneficial to the deeper and longer-term development of the hydrogen storage and transportation industry.
[0026] The buffer device further includes a purge inlet pipeline 16 and a purge exhaust pipeline 17. The nitrogen tank 18 is connected to the hydrogen supply pipeline 7 through the purge inlet pipeline 16, and the high-pressure pipeline 4 is connected to the flare tower 19 through the purge exhaust pipeline 17. A first purge stop valve 20 is provided at the output end of the purge inlet pipeline 16.
[0027] A purge bypass pipeline 21 is also connected between the purge inlet pipeline 16 and the purge exhaust pipeline 17, and a second purge stop valve 22 is provided on the purge bypass pipeline 21.
[0028] The purging includes the following situations:
[0029] Case 1: Open the first purge stop valve 20 and close the second purge stop valve 22. Nitrogen enters the hydrogen supply pipeline 7, the low-pressure pipeline 5, and the high-pressure pipeline 4 along the purge inlet pipeline 16 to form a purge, and then is discharged along the purge exhaust pipeline 17 through the blow-off tower 19.
[0030] Case 2: Close the first purge stop valve 20 and open the second purge stop valve 22. Nitrogen purges along the purge bypass pipeline 21 and the purge exhaust pipeline 17 towards the blow-off tower 19, and a slightly nitrogen-rich environment in the pipeline can be maintained when there is no hydrogen overpressure blow-off.
[0031] Case 3: Close the first purge stop valve 20 and close the second purge stop valve 22. There is no nitrogen purge.
Claims
1. A hydrogen unloading buffer device for supplying hydrogen to a 30 Mpa long tube trailer, comprising a hydrogen storage tank (1), wherein the output end of the hydrogen long tube trailer (2) is connected to the hydrogen storage tank (1) by means of a hydrogen inlet pipeline (3), and is characterized in that, A high-pressure pipeline (4) and a low-pressure pipeline (5) in parallel are further arranged between the hydrogen inlet pipeline (3) and the hydrogen storage tank (1). A buffer bottle group (6) is connected in series on the high-pressure pipeline (4). The output ends of the high-pressure pipeline (4) and the low-pressure pipeline (5) are respectively connected to a hydrogen supply pipeline (7). The output end of the hydrogen supply pipeline (7) is respectively connected to the input end of a compressor (8) and the input end of the hydrogen storage tank (1). The output end of the compressor (8) is connected to the input end of the buffer bottle group (6) through a compression pipeline (9).
2. The hydrogen unloading buffer device for 30Mpa long tube trailers for hydrogen supply according to claim 1, characterized in that, A hydrogen unloading stop valve (10) is arranged on the hydrogen inlet pipeline (3). A high-pressure stop valve (11) is arranged on the high-pressure pipeline (4) between the hydrogen inlet pipeline (3) and the buffer bottle group (6). A low-pressure stop valve (12) is arranged on the low-pressure pipeline (5). A hydrogen supply stop valve (13) is arranged on the hydrogen supply pipeline (7). A compression stop valve (14) is arranged at the input end of the compressor (8). A hydrogen storage stop valve (15) is arranged at the input end of the hydrogen storage tank (1).
3. A hydrogen unloading buffer device for 30 Mpa long tube trailers for hydrogen supply according to claim 1, characterized in that, The buffer device further includes a purge inlet pipeline (16) and a purge exhaust pipeline (17). A nitrogen gas tank (18) is connected to the hydrogen supply pipeline (7) through the purge inlet pipeline (16). The high-pressure pipeline (4) is connected to a flare tower (19) through the purge exhaust pipeline (17). A first purge stop valve (20) is arranged at the output end of the purge inlet pipeline (16).
4. A hydrogen unloading buffer device for a 30 Mpa long tube trailer for hydrogen supply according to claim 3, characterized in that, A purge bypass pipeline (21) is further connected between the purge inlet pipeline (16) and the purge exhaust pipeline (17). A second purge stop valve (22) is arranged on the purge bypass pipeline (21).