A hydrogen refueling system and filling method for hydrogen refueling mother and daughter stations

Abstract

This invention belongs to the field of hydrogen filling, specifically a hydrogen refueling system and method for mutual replenishment between a hydrogen refueling mother station and a hydrogen refueling station. The system includes a 20MPa compressor, a 45MPa compressor, a hydrogen refueling station compressor, a hydrogen storage cylinder group, and a hydrogen dispenser connected by pipelines. The core of its technical solution lies in integrating the mother station and daughter station equipment through complementary main pipelines, and setting up two operating modes: daughter station primary supply and mother station primary supply. This invention improves compressor utilization, reduces equipment start-up and shutdown frequency and floor space requirements, and can utilize a 30MPa long-tube trailer as a buffer tank, improving refueling efficiency and system flexibility.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen filling, and in particular to the hydrogen mutual replenishment system and filling method of hydrogen refueling mother and daughter stations. Background Technology

[0002] A hydrogen refueling mother station is primarily a hydrogen energy infrastructure focused on hydrogen production and purification, which then supplies hydrogen to the surrounding area via long-tube trucks. The typical process flow of a hydrogen refueling mother station is as follows: crude hydrogen is obtained from industrial byproducts of chemical plants or through water electrolysis, etc. This crude hydrogen is then purified by a hydrogen purification unit to meet the requirements for high-purity hydrogen or hydrogen for hydrogen fuel cells. It then enters a hydrogen compressor for compression, typically to 20 MPa, before entering the filling area to fill long-tube trucks, which are then delivered to hydrogen refueling stations or other users. With significant improvements in long-tube truck manufacturing, two levels of pressure are now available: 20 MPa and 30 MPa. To meet the filling requirements of 30 MPa long-tube trucks, a 45 MPa compressor with an inlet pressure of 10-20 MPa is typically installed in the compressor area. Figure 1 As shown, the purified hydrogen is compressed to 20MPa by the 20MPa compressor 1 and then split into two streams. One stream goes to the 20MPa filling area to fill the 20MPa long tube car 3, and the other stream enters the buffer hydrogen storage cylinder group 5 and then goes to the inlet of the 45MPa compressor 2. After being compressed to 30MPa by the 45MPa compressor 2, it is filled into the 30MPa long tube car 4.

[0003] Currently, mature commercial hydrogen refueling stations mainly cater to vehicles requiring 35MPa fuel, and their main processes can be clearly divided into three core stages: hydrogen unloading, pressurization and storage, and refueling. For example... Figure 2 As shown, the long-tube truck carries hydrogen at a pressure of approximately 20 MPa into the station. After a safe connection, it begins unloading hydrogen into the station's hydrogen storage cylinder group via a degassing column. Initially, the hydrogen flows naturally due to the pressure difference. When the pressure difference is insufficient, the station's compressor is activated to compress the hydrogen in the long-tube truck, sequentially filling the low-pressure, medium-pressure, and high-pressure cylinder groups. When refueling, hydrogen is drawn from the source cylinder group with the best matching pressure through the storage cylinder group, and refueling is performed in stages from low to high pressure, achieving rapid refueling while saving energy and controlling temperature rise.

[0004] Since the compressors at hydrogen refueling mother stations typically operate continuously for extended periods, diaphragm compressors are preferred. However, diaphragm compressors are not suitable for frequent start-stop operations. For short-duration, frequent start-stop operations, liquid-driven compressors are more advantageous, but they are not suitable for long-term operation. Therefore, both types of compressors present the following problems during filling or refueling:

[0005] 1. Because the usage of 30MPa long-tube cars is not high, the 30MPa compressor cannot run continuously, resulting in frequent start-stop cycles and a decrease in the service life of the diaphragm.

[0006] 2. Because the usage of 30MPa long-tube trucks is not high, the 30MPa compressors are often idle, resulting in a waste of resources.

[0007] 3. Commercial hydrogen refueling stations must have designated areas for parking long-tube vehicles, typically with two or more unloading bays. In accordance with safety standards, explosion-proof walls must also be constructed. Therefore, the unloading area occupies a large area and incurs high investment costs.

[0008] 4. Currently, commercial hydrogen refueling stations can meet refueling requirements using liquid-driven compressors because the number of hydrogen-powered vehicles is not high. However, as hydrogen energy becomes more widespread and the number of hydrogen-powered vehicles increases rapidly, the prolonged operation of the liquid-driven compressors will lead to severe damage and aging of the seals, frequent maintenance, and disruption to hydrogen refueling at the stations. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hydrogen refueling system and method for mutual replenishment of hydrogen between hydrogen refueling substations and hydrogen refueling mother stations. By rationally configuring the characteristics of each hydrogen refueling substation and hydrogen refueling mother station, the refueling efficiency can be improved, the number of start-ups and shutdowns of diaphragm compressors can be reduced, and the utilization rate of equipment can be increased.

[0010] The technical solution of this invention is:

[0011] A first aspect of the present invention is to provide a hydrogen refueling system for hydrogen refueling mother and daughter stations, comprising:

[0012] The product gas pipeline connects to the inlet of the 20MPa compressor;

[0013] The outlet of the 20MPa compressor is divided into three streams: the first stream is connected to the 20MPa long pipe vehicle through the 20MPa filling main pipe, the second stream is connected to the inlet of the 45MPa compressor through the 45MPa compressor inlet pipeline, and the third stream is connected to the inlet of the hydrogen refueling substation compressor through the substation hydrogen replenishment pipeline.

[0014] The outlet of the 45MPa compressor is connected to the 30MPa long pipe vehicle through the 45MPa compressor outlet pipeline and the 30MPa filling main pipe.

[0015] The complementary main pipe is connected to the 45MPa compressor outlet pipeline and is divided into a medium-pressure complementary pipeline and a high-pressure complementary pipeline, which are connected to the medium-pressure hydrogen pipeline and the high-pressure hydrogen pipeline, respectively.

[0016] The medium-pressure hydrogen storage cylinder group is connected to the medium-pressure hydrogen pipeline, and the high-pressure hydrogen storage cylinder group is connected to the high-pressure hydrogen pipeline.

[0017] The outlet of the hydrogen refueling substation compressor is connected to the medium-pressure hydrogen pipeline and the high-pressure hydrogen pipeline through the substation compressor outlet pipeline;

[0018] The hydrogen dispenser is connected to the substation's hydrogen supply pipeline, medium-pressure hydrogen pipeline, and high-pressure hydrogen pipeline via low-pressure hydrogen supply pipeline, medium-pressure hydrogen supply pipeline, and high-pressure hydrogen supply pipeline, respectively.

[0019] Multiple programmable valves and pressure gauges are connected to the DCS system signal.

[0020] Furthermore, a 20MPa filling pressure gauge and a 20MPa long-tube shut-off valve are sequentially installed on the 20MPa filling main pipe; the 45MPa compressor inlet pipeline is connected to the buffer hydrogen storage cylinder group via a pipeline; a hydrogen replenishment flow meter is installed on the substation hydrogen replenishment pipeline, and it is connected to the hydrogen dispenser via a low-pressure hydrogen replenishment pipeline, and a low-pressure refueling programmable valve is installed on the low-pressure hydrogen replenishment pipeline.

[0021] Furthermore, a 45MPa compressor programmable valve and a 45MPa compressor outlet pressure gauge are sequentially installed on the 45MPa compressor outlet pipeline; a 30MPa long pipe trolley shut-off valve, a pressure regulating valve, and a 30MPa filling pressure gauge are sequentially installed on the 30MPa filling main pipe; a 30MPa filling manual valve is provided on the 30MPa long pipe trolley; and a complementary programmable valve and a complementary main pipe pressure gauge are sequentially installed on the complementary main pipe.

[0022] Furthermore, a medium-pressure hydrogen replenishment control valve and a medium-pressure hydrogen replenishment pressure gauge are sequentially installed between the medium-pressure complementary pipeline and the medium-pressure hydrogen storage cylinder group on the medium-pressure hydrogen pipeline; a high-pressure hydrogen replenishment control valve and a high-pressure hydrogen replenishment pressure gauge are sequentially installed between the high-pressure complementary pipeline and the high-pressure hydrogen storage cylinder group on the high-pressure hydrogen pipeline; and a substation compressor control valve and a substation compressor outlet pressure gauge are sequentially installed on the substation compressor outlet pipeline.

[0023] Furthermore, a medium-pressure refueling programmable valve is installed on the medium-pressure refueling pipeline, and a medium-pressure hydrogen refueling programmable valve is installed on the medium-pressure hydrogen pipeline; a high-pressure refueling programmable valve is installed on the high-pressure refueling pipeline; the DCS system is configured to control all programmable valves and pressure gauges, and is set to substation main supply mode and mother station main supply mode.

[0024] Furthermore, the 30MPa long-tube vehicle is connected to the 45MPa compressor outlet pipeline via a 30MPa filling main pipe, and can be connected in series with a medium-pressure hydrogen storage cylinder group via a complementary main pipe, a medium-pressure complementary pipeline, and a medium-pressure hydrogen pipeline to be used as a buffer tank.

[0025] A second aspect of the present invention is to provide a filling method for the hydrogen mutual replenishment system of the hydrogen refueling mother and daughter stations, including a daughter station main supply mode, wherein:

[0026] Refueling operation: Open the low-pressure refueling control valve to start refueling. When the pressure rises to 1 MPa below the pressure displayed on the substation compressor outlet pressure gauge, close the low-pressure refueling control valve, open the medium-pressure hydrogen replenishment control valve and the medium-pressure refueling control valve. When the pressure rises to 1 MPa below the pressure displayed on the medium-pressure hydrogen replenishment pressure gauge, close the medium-pressure hydrogen replenishment control valve and the medium-pressure refueling control valve, open the high-pressure hydrogen replenishment control valve and the high-pressure refueling control valve, until the refueling pressure reaches 35 MPa and then stop.

[0027] Pressure replenishment operation: When the medium-pressure hydrogen replenishment pressure gauge shows a pressure lower than 24MPa or the high-pressure hydrogen replenishment pressure gauge shows a pressure lower than 37MPa, start the hydrogen refueling substation compressor, open the substation compressor programmable valve, the medium-pressure hydrogen replenishment programmable valve and the medium-pressure hydrogen refueling programmable valve, replenish the medium-pressure hydrogen storage cylinder group pressure to 30MPa, then close the medium-pressure hydrogen replenishment programmable valve and the medium-pressure hydrogen refueling programmable valve, open the high-pressure hydrogen replenishment programmable valve, replenish the high-pressure hydrogen storage cylinder group pressure to 45MPa and then close it;

[0028] Filling operation: When the 30MPa long tube car needs to be filled, open the 30MPa filling manual valve. The DCS system will automatically open the substation compressor programmable valve, medium-pressure hydrogenation programmable valve, medium-pressure complementary programmable valve, complementary programmable valve and long tube car shut-off valve. The pressure regulating valve will be set to automatic, and the pressure increase rate will be controlled to 30MPa by the 30MPa filling pressure gauge.

[0029] Furthermore, it also includes a master-supplier model, in which:

[0030] Refilling operation: Same as the pressurization operation in the substation main supply mode;

[0031] Pressure replenishment operation: When the medium-pressure hydrogen replenishment pressure gauge shows a pressure lower than 24MPa or the high-pressure hydrogen replenishment pressure gauge shows a pressure lower than 37MPa, start the 45MPa compressor, open the 45MPa compressor control valve, the complementary control valve, the medium-pressure hydrogen replenishment control valve, and the medium-pressure complementary control valve to replenish the medium-pressure hydrogen storage cylinder group pressure to 30MPa. Then close the medium-pressure hydrogen replenishment control valve and the medium-pressure complementary control valve, open the high-pressure hydrogen replenishment control valve and the high-pressure complementary control valve to replenish the high-pressure hydrogen storage cylinder group pressure to 45MPa, and then close them.

[0032] Filling operation: When the 30MPa long tube car needs to be filled, open the 30MPa filling manual valve. The DCS system will automatically open the 45MPa compressor programmable valve and the long tube car shut-off valve. The filling pressure regulating valve will be set to automatic, and the pressure increase rate will be controlled to 30MPa by the 30MPa filling pressure gauge.

[0033] Furthermore, it also includes using a 30MPa long-tube car as a buffer tank, wherein:

[0034] When the 30MPa filling manual valve is opened, the DCS system automatically opens the complementary control valve, the medium-pressure complementary control valve, and the medium-pressure hydrogenation control valve;

[0035] If the pressure of the 30MPa filling pressure gauge is lower than that of the medium-pressure hydrogen replenishment pressure gauge, open the long tube truck shut-off valve and the filling pressure regulating valve, and fill the 30MPa long tube truck to the same pressure as the medium-pressure hydrogen storage cylinder group according to the filling operation procedure.

[0036] If the pressure of the 30MPa filling pressure gauge is higher than the pressure of the medium-pressure hydrogen replenishment pressure gauge, then follow the replenishment operation procedure to replenish the pressure of the medium-pressure hydrogen storage cylinder group to match the pressure of the 30MPa long-tube vehicle.

[0037] Open the medium-pressure hydrogen replenishment control valve and connect the 30MPa long-tube vehicle to the medium-pressure hydrogen storage cylinder group in series;

[0038] In the main supply mode of the substation, when the pressure gauge of the substation compressor outlet is higher than 30MPa, the medium-pressure hydrogen refueling control valve is automatically closed to prevent overpressure of the 30MPa long-tube car; when it is lower than 30MPa, the medium-pressure hydrogen refueling control valve is automatically opened. In the main supply mode of the mother station, when the pressure gauge of the complementary main pipeline is higher than 30MPa, the medium-pressure complementary control valve is automatically closed to prevent overpressure of the 30MPa long-tube car; when it is lower than 30MPa, the medium-pressure complementary control valve is automatically opened.

[0039] Furthermore, the pressure regulating valve is connected to a 30MPa filling pressure gauge, and the pressure increase rate is controlled at 0.1MPa / min.

[0040] The advantages and positive effects of this invention are:

[0041] 1. This invention uses a 20MPa compressor to compress the gas and directly deliver it to the hydrogen refueling substation, eliminating the need for long-tube trucks and unloading columns, thus reducing the footprint and investment costs.

[0042] 2. This invention utilizes a 20MPa pipeline directly as a low-pressure refueling pipeline, reducing the investment in low-pressure hydrogen storage cylinder groups, lowering investment costs, and reducing the floor space required.

[0043] 3. This invention uses a 30MPa long-tube truck filled by a hydrogen refueling station compressor, avoiding the reduced diaphragm life caused by frequent start-stop of a 45MPa compressor, reducing maintenance costs and improving the utilization rate of the hydrogen refueling station compressor.

[0044] 4. This invention uses a 45MPa compressor to pressurize the medium-pressure hydrogen storage cylinder group and the high-pressure hydrogen storage cylinder group when filling a 30MPa long-tube truck, thereby reducing the number of start-ups and shutdowns of the compressor at the hydrogen refueling substation and improving the utilization rate of the 45MPa compressor.

[0045] 5. The 30MPa long-tube vehicle of the present invention can be used in series with a medium-pressure hydrogen storage cylinder group, which increases the buffer volume of medium-pressure hydrogen, stabilizes the filling pressure to the greatest extent, and improves the filling speed. Attached Figure Description

[0046] Figure 1 Background technical solution: Hydrogen refueling mother station process flow diagram;

[0047] Figure 2 Background technical solution: Hydrogen refueling station process flow diagram;

[0048] Figure 3 : Process flow diagram of the present invention.

[0049] Among them: 1-20MPa compressor, 2-45MPa compressor, 3-20MPa long-tube vehicle, 4-30MPa long-tube vehicle, 5-buffer hydrogen storage cylinder group, 6-hydrogen refueling substation compressor, 7-medium-pressure hydrogen storage cylinder group, 8-high-pressure hydrogen storage cylinder group, 9-hydrogen refueling machine, 10-product gas pipeline, 11-20MPa filling main pipe, 12-45MPa compressor inlet pipeline, 13-45MPa compressor outlet pipeline 14-Complementary main pipeline, 15-Substation hydrogen replenishment pipeline, 16-30MPa filling main pipeline, 17-Low-pressure hydrogen replenishment pipeline, 18-Substation compressor outlet pipeline, 19-Medium-pressure complementary pipeline, 20-Medium-pressure hydrogen pipeline, 21-High-pressure hydrogen pipeline, 22-High-pressure complementary pipeline, 23-Medium-pressure refueling pipeline, 24-High-pressure refueling pipeline, V1-20MPa filling manual valve, V2-30MPa filling manual valve, XV 1-30MPa long-tube truck shut-off valve, XV2-20MPa long-tube truck shut-off valve, KV1-45MPa compressor programmable valve, KV2-complementary programmable valve, KV3-substation compressor programmable valve, KV4-medium-pressure hydrogen replenishment programmable valve, KV5-high-pressure hydrogen replenishment programmable valve, KV6-medium-pressure complementary programmable valve, KV7-high-pressure complementary programmable valve, KV8-high-pressure refueling programmable valve, KV9-medium-pressure refueling programmable valve, KV10-low-pressure refueling programmable valve, KV11-medium-pressure hydrogen refueling programmable valve, PI1-45MPa compressor outlet pressure gauge, PI2-20MPa filling pressure gauge, PI3-30MPa filling pressure gauge, PI4-complementary main pipe pressure gauge, PI5-substation compressor outlet pressure gauge, PI6-medium-pressure hydrogen replenishment pressure gauge, PI7-high-pressure hydrogen replenishment pressure gauge, PV1-pressurization regulating valve, FI1-hydrogen replenishment flow meter. Detailed Implementation

[0050] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0051] A hydrogen refueling system for both mother and daughter stations, with the following process flow: Figure 3As shown: The purified product gas is connected to the inlet of the 20MPa compressor 1 through product gas pipeline 10. The outlet of the 20MPa compressor 1 is divided into three streams. One stream is connected to the 20MPa filling manual valve V1 through the 20MPa filling main pipe 11. A 20MPa filling pressure gauge PI2 and a 20MPa long pipe trolley shut-off valve XV2 are installed sequentially on the 20MPa filling main pipe 11. The 20MPa filling manual valve V1 is connected to the 20MPa long pipe trolley 3 through a filling hose. The second stream is connected to the 4... The 5MPa compressor inlet pipeline 12 is connected to the inlet of the 45MPa compressor 2. The 45MPa compressor inlet pipeline 12 is connected to the buffer hydrogen storage cylinder group 5 via a pipeline. The third line is connected to the inlet of the hydrogen refueling substation compressor 6 via the substation hydrogen replenishment pipeline 15. A hydrogen replenishment flow meter FI1 is installed on the substation hydrogen replenishment pipeline 15. On the other hand, the substation hydrogen replenishment pipeline 15 is connected to the hydrogen dispenser 9 via the low-pressure hydrogen replenishment pipeline 17. A low-pressure refueling programmable valve KV10 is installed on the low-pressure hydrogen replenishment pipeline 17.

[0052] The outlet of the 45MPa compressor 2 is connected to the 30MPa long-tube trolley shut-off valve XV1 via the 45MPa compressor outlet pipeline 13. The 45MPa compressor programmable valve KV1 and the 45MPa compressor outlet pressure gauge PI1 are installed sequentially on the 45MPa compressor outlet pipeline 13. The other end of the 30MPa long-tube trolley shut-off valve XV1 is connected to the 30MPa filling manual valve V2 via the 30MPa filling main pipeline 16. The 30MPa filling manual valve V2 is connected to the 30MPa long-tube trolley 4 via the filling hose. The 30MPa filling main pipeline 16 is installed sequentially on the filling pressure regulating valve PV1 and the 30MPa filling pressure gauge PI3. A complementary main pipe 14 is connected to the 45MPa compressor outlet pipeline 13 between the 45MPa compressor outlet pressure gauge PI1 and the 30MPa long-pipe shut-off valve XV1. A complementary control valve KV2 and a complementary main pipe pressure gauge PI4 are installed sequentially on the complementary main pipe 14. The complementary main pipe 14 is divided into two branches. One branch is connected to the medium-pressure hydrogen pipeline 20 through the medium-pressure complementary pipeline 19, and a medium-pressure complementary control valve KV6 is installed on the medium-pressure complementary pipeline 19. The other branch is connected to the high-pressure hydrogen pipeline 21 through the high-pressure complementary pipeline 22, and a high-pressure complementary control valve KV7 is installed on the high-pressure complementary pipeline 22.

[0053] One end of the medium-pressure hydrogen pipeline 20 is connected to the medium-pressure hydrogen storage cylinder group 7. A medium-pressure hydrogen replenishment programmable valve KV4 and a medium-pressure hydrogen replenishment pressure gauge PI6 are installed sequentially on the medium-pressure hydrogen pipeline 20 between the medium-pressure complementary pipeline 19 and the medium-pressure hydrogen storage cylinder group 7. The other end of the medium-pressure hydrogen pipeline 20 is divided into two branches. One branch is connected to the outlet of the hydrogen refueling substation compressor 6 through the substation compressor outlet pipeline 18. A substation compressor programmable valve KV3 and a substation compressor outlet pressure gauge PI5 are installed sequentially on the substation compressor outlet pipeline 18. The other branch is connected to the hydrogen dispenser 9 through the medium-pressure refueling pipeline 23. A medium-pressure refueling programmable valve KV9 is installed on the medium-pressure refueling pipeline 23. A medium-pressure hydrogen refueling programmable valve KV11 is installed on the medium-pressure hydrogen pipeline 20 between the substation compressor outlet pipeline 18 and the medium-pressure refueling pipeline 23. Similarly, a high-pressure hydrogen storage cylinder group 8 is connected to one end of the high-pressure hydrogen pipeline 21. A high-pressure hydrogen replenishment programmable valve KV5 and a high-pressure hydrogen replenishment pressure gauge PI7 are installed sequentially on the high-pressure hydrogen pipeline 21 between the high-pressure complementary pipeline 22 and the high-pressure hydrogen storage cylinder group 8. The other end of the high-pressure hydrogen pipeline 21 is divided into two branches. One branch is connected to the outlet of the hydrogen refueling substation compressor 6 through the substation compressor outlet pipeline 18, and the other branch is connected to the hydrogen refueling machine 9 through the high-pressure refueling pipeline 24. A high-pressure refueling programmable valve KV8 is installed on the high-pressure refueling pipeline 24.

[0054] The 45MPa compressor outlet pressure gauge PI1, 20MPa filling pressure gauge PI2, 30MPa filling pressure gauge PI3, complementary main pipe pressure gauge PI4, substation compressor outlet pressure gauge PI5, and medium-pressure hydrogen replenishment pressure gauge PI6 are online pressure gauges, which are connected to the DCS system via signals.

[0055] The 30MPa long-tube truck shut-off valve XV1, 20MPa long-tube truck shut-off valve XV2, 45MPa compressor programmable valve KV1, complementary programmable valve KV2, substation compressor programmable valve KV3, medium-pressure hydrogen replenishment programmable valve KV4, high-pressure hydrogen replenishment programmable valve KV5, medium-pressure complementary programmable valve KV6, high-pressure complementary programmable valve KV7, high-pressure refueling programmable valve KV8, medium-pressure refueling programmable valve KV9, and low-pressure refueling programmable valve KV10 are connected to the DCS system via signal.

[0056] The pressure regulating valve PV1 is connected to the 30MPa filling pressure gauge PI3.

[0057] The DCS system is configured with two modes: a "substation main supply" mode and a "mother station main supply" mode.

[0058] Example 1: Substation main supply mode.

[0059] (1) Refueling operation: When the number of hydrogen refueling vehicles is small, select the "substation main supply" mode on the DCS system. Initially, all valves are closed, the medium-pressure hydrogen storage cylinder group 7 is set to 30MPa, the high-pressure hydrogen storage cylinder group 8 is set to 45MPa, the 20MPa compressor 1 is running, the hydrogen refueling substation compressor 6 is in hot standby mode, and the 45MPa compressor 2 is in shutdown mode. When hydrogen dispenser 9 starts dispensing, open the low-pressure dispensing control valve KV10 to begin dispensing. When the dispensing pressure rises to 1 MPa below the pressure displayed on the substation compressor outlet pressure gauge PI5, close the low-pressure dispensing control valve KV10 and open the medium-pressure hydrogen replenishment control valves KV4 and KV9. When the dispensing pressure rises to 1 MPa below the pressure displayed on the medium-pressure hydrogen replenishment pressure gauge PI6, close the medium-pressure hydrogen replenishment control valves KV4 and KV9 and open the high-pressure hydrogen replenishment control valves KV5 and KV8 until the dispensing pressure reaches 35 MPa and then stop dispensing.

[0060] (2) Pressure replenishment operation: When the pressure displayed by the medium-pressure hydrogen replenishment pressure gauge PI6 is lower than 24MPa or the pressure displayed by the high-pressure hydrogen replenishment pressure gauge PI7 is lower than 37MPa, the hydrogen refueling substation compressor 6 starts and automatically opens the substation compressor programmable valve KV3, the medium-pressure hydrogen replenishment programmable valve KV4 and the medium-pressure hydrogen refueling programmable valve KV11 to replenish the pressure of the medium-pressure hydrogen storage cylinder group 7 to 30MPa. Then, the medium-pressure hydrogen replenishment programmable valve KV4 and the medium-pressure hydrogen refueling programmable valve KV11 are closed, and the high-pressure hydrogen replenishment programmable valve KV5 is opened. After the pressure is replenished to 45MPa, the high-pressure hydrogen replenishment programmable valve KV5 is closed.

[0061] (3) Filling operation: When the 30MPa long tube vehicle 4 needs to be filled, the operator connects the filling hose, opens the 30MPa filling manual valve V2, and clicks the "30MPa filling" activation button on the DCS system. The DCS system will then automatically open the substation compressor programmable valve KV3, the medium-pressure hydrogenation programmable valve KV11, the medium-pressure complementary programmable valve KV6, and the 30MPa long tube vehicle shut-off valve XV1. The filling pressure regulating valve PV1 will be set to automatic, and the pressure will be controlled by the 30MPa filling pressure gauge PI3. The pressure regulating valve PV1 is used to increase the pressure at a rate of 0.1 MPa / min. When the pressure on the 30 MPa filling pressure gauge PI3 rises to 1 MPa below the pressure displayed on the substation compressor outlet pressure gauge PI5, the hydrogen refueling substation compressor 6 is started. The pressure is increased until the 30 MPa filling pressure gauge PI3 reaches 30 MPa. Then, the 30 MPa long-tube car shut-off valve XV1 and the pressure regulating valve PV1 are closed. The operator closes the 30 MPa filling manual valve V2, and the filling is completed.

[0062] Example 2: "Main Station Main Supply" Mode.

[0063] (1) Refueling Operation: When a large number of vehicles are refueling, select the "Main Station Main Supply" mode on the DCS system. Initially, all valves are closed, the medium-pressure hydrogen storage cylinder group 7 is set to 30MPa, the high-pressure hydrogen storage cylinder group 8 is set to 45MPa, the 20MPa compressor 1 is running, the hydrogen refueling substation compressor 6 is in hot standby mode, and the 45MPa compressor 2 is in self-circulation mode. The refueling process is the same as the "Substation Main Supply" mode described above, and refueling is completed according to the above operation.

[0064] (2) Pressure replenishment operation: When the pressure displayed by the medium-pressure hydrogen replenishment pressure gauge PI6 is lower than 24MPa or the pressure displayed by the high-pressure hydrogen replenishment pressure gauge PI7 is lower than 37MPa, the 45MPa compressor 2 starts to pressurize, automatically opening the 45MPa compressor programmable valve KV1, the complementary programmable valve KV2, the medium-pressure hydrogen replenishment programmable valve KV4, and the medium-pressure complementary programmable valve KV6 to replenish the pressure of the medium-pressure hydrogen storage cylinder group 7 to 30MPa. Then, the medium-pressure hydrogen replenishment programmable valve KV4 and the medium-pressure complementary programmable valve KV6 are closed, and the high-pressure hydrogen replenishment programmable valve KV5 and the high-pressure complementary programmable valve KV7 are opened. After the pressure is replenished to 45MPa, the high-pressure hydrogen replenishment programmable valve KV5 and the high-pressure complementary programmable valve KV7 are closed, and the 45MPa compressor 2 is in self-circulation state.

[0065] (3) Filling operation: When the 30MPa long tube vehicle 4 needs to be filled, the operator connects the filling hose, opens the 30MPa filling manual valve V2, and clicks the "30MPa filling" activation button on the DCS system. The DCS system will then automatically open the 45MPa compressor programmable valve KV1 and the 30MPa long tube vehicle shut-off valve XV1, and put the pressure regulating valve PV1 into automatic mode. The pressure regulating valve PV1 is controlled by the 30MPa filling pressure gauge PI3, and the pressure is increased at a rate of 0.1MPa / min. When the pressure of the 30MPa filling pressure gauge PI3 rises to 1MPa lower than the pressure displayed by the substation compressor outlet pressure gauge PI5, the hydrogenation substation compressor 6 starts to pressurize until the pressure of the 30MPa filling pressure gauge PI3 reaches 30MPa. Then, the 30MPa long tube vehicle shut-off valve XV1 and the pressure regulating valve PV1 are closed, and the operator closes the 30MPa filling manual valve V2. The filling is then completed.

[0066] Example 3: 30MPa long tube car 4 as a buffer tank.

[0067] When the workload of the 30MPa long-tube car 4 is low, it can be temporarily used as a buffer tank. The operation is as follows:

[0068] The operator connects the filling hose, opens the 30MPa filling manual valve V2, and clicks the "30MPa Buffer" activation button on the DCS system. The DCS system then automatically opens the complementary control valve KV2, the medium-pressure complementary control valve KV6, and the medium-pressure hydrogen replenishment control valve KV11. If the pressure displayed on the 30MPa filling pressure gauge PI3 of the 30MPa long-tube vehicle 4 is lower than the pressure displayed on the medium-pressure hydrogen replenishment pressure gauge PI6, the operator first opens the 30MPa long-tube vehicle shut-off valve XV1 and the pressure regulating valve PV1, and replenishes pressure according to the "30MPa Filling" procedure until the pressure displayed on the 30MPa filling pressure gauge PI3 and the medium-pressure hydrogen replenishment pressure gauge PI6 are consistent. Then, the operator opens the medium-pressure hydrogen replenishment control valve KV4, connecting the 30MPa long-tube vehicle 4 and the medium-pressure hydrogen storage cylinder group 7 in series. If the "substation main supply" mode is in operation, when the pressure on substation compressor outlet pressure gauge PI5 exceeds 30 MPa, close the medium-pressure hydrogen refueling control valve KV11 to prevent overpressure. If the "mother station main supply" mode is in operation, when the pressure on complementary main pipe pressure gauge PI4 exceeds 30 MPa, close the medium-pressure complementary control valve KV6 to prevent overpressure. The refueling procedure follows the "Refueling Operation" steps described above.

[0069] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept, and these all fall within the protection scope of the present invention.

Claims

1. A hydrogen complementary filling system of hydrogen substation and parent station, comprising: a product gas pipeline (10) connected to the inlet of a 20 MPa compressor (1); the outlet of the 20 MPa compressor (1) is divided into three streams: the first stream is connected to a 20 MPa long tube truck (3) through a 20 MPa filling main pipe (11), the second stream is connected to the inlet of a 45 MPa compressor (2) through a 45 MPa compressor inlet pipeline (12), and the third stream is connected to the inlet of a hydrogen substation compressor (6) through a substation hydrogen supplement pipeline (15); the outlet of the 45 MPa compressor (2) is connected to a 30 MPa long tube truck (4) through a 45 MPa compressor outlet pipeline (13) and a 30 MPa filling main pipe (16); a complementary main pipe (14) is connected to the 45 MPa compressor outlet pipeline (13) and is divided into a medium pressure complementary pipeline (19) and a high pressure complementary pipeline (22), which are respectively connected to a medium pressure hydrogen pipeline (20) and a high pressure hydrogen pipeline (21); a medium pressure hydrogen storage bottle group (7) is connected to the medium pressure hydrogen pipeline (20), and a high pressure hydrogen storage bottle group (8) is connected to the high pressure hydrogen pipeline (21); the outlet of the hydrogen substation compressor (6) is connected to the medium pressure hydrogen pipeline (20) and the high pressure hydrogen pipeline (21) through a substation compressor outlet pipeline (18); a hydrogen filling machine (9) is connected to the substation hydrogen supplement pipeline (15), the medium pressure hydrogen pipeline (20) and the high pressure hydrogen pipeline (21) through a low pressure hydrogen supplement pipeline (17), a medium pressure filling pipeline (23) and a high pressure filling pipeline (24) respectively; a plurality of program control valves and pressure gauges are connected to the signal of a DCS system; the DCS system is configured to control all program control valves and pressure gauges, and set a substation main supply mode and a parent station main supply mode; the 30 MPa long tube truck (4) is connected to the 45 MPa compressor outlet pipeline (13) through the 30 MPa filling main pipe (16), and can be connected to the medium pressure hydrogen storage bottle group (7) in series through the complementary main pipe (14), the medium pressure complementary pipeline (19) and the medium pressure hydrogen pipeline (20) to be used as a buffer tank. 2.The system according to claim 1, wherein: a 20 MPa filling pressure gauge (PI2) and a 20 MPa long tube truck cut-off valve (XV2) are installed on the 20 MPa filling main pipe (11) in sequence; the 45 MPa compressor inlet pipeline (12) is connected to a buffer hydrogen storage bottle group (5) through a pipeline; a hydrogen supplement flowmeter (FI1) is installed on the substation hydrogen supplement pipeline (15), and the substation hydrogen supplement pipeline (15) is connected to the hydrogen filling machine (9) through the low pressure hydrogen supplement pipeline (17), and a low pressure filling program control valve (KV10) is installed on the low pressure hydrogen supplement pipeline (17). 3.The system according to claim 2, wherein: a 45 MPa compressor program control valve (KV1) and a 45 MPa compressor outlet pressure gauge (PI1) are installed on the 45 MPa compressor outlet pipeline (13) in sequence. The 30MPa filling main pipe (16) is sequentially provided with a 30MPa long pipe truck cut-off valve (XV1), a pressure regulating valve (PV1) and a 30MPa filling pressure gauge (PI3); the 30MPa filling main pipe (16) is provided with a 30MPa filling hand valve (V2) on the 30MPa long pipe truck (4); The complementary main pipe (14) is sequentially provided with a complementary program-controlled valve (KV2) and a complementary main pipe pressure gauge (PI4).

4. The system according to claim 3, characterized in that: The medium-pressure hydrogen pipe (20) is sequentially provided with a medium-pressure hydrogen supplement program-controlled valve (KV4) and a medium-pressure hydrogen supplement pressure gauge (PI6) between the medium-pressure complementary pipe (19) and the medium-pressure hydrogen storage bottle group (7); The high-pressure hydrogen pipe (21) is sequentially provided with a high-pressure hydrogen supplement program-controlled valve (KV5) and a high-pressure hydrogen supplement pressure gauge (PI7) between the high-pressure complementary pipe (22) and the high-pressure hydrogen storage bottle group (8); The substation compressor outlet pipe (18) is sequentially provided with a substation compressor program-controlled valve (KV3) and a substation compressor outlet pressure gauge (PI5).

5. The system according to claim 4, characterized in that: The medium-pressure filling pipe (23) is provided with a medium-pressure filling program-controlled valve (KV9), and the medium-pressure hydrogen pipe (20) is provided with a medium-pressure hydrogen supplement program-controlled valve (KV11); The high-pressure filling pipe (24) is provided with a high-pressure filling program-controlled valve (KV8).

6. A filling method of the hydrogen supplement filling system of the hydrogen supplement filling system according to claim 5, comprising a substation main supply mode, wherein: Filling operation: open the low-pressure filling program-controlled valve (KV10) to start filling, and when the pressure rises to be lower than the pressure 1MPa displayed by the substation compressor outlet pressure gauge (PI5), close the low-pressure filling program-controlled valve (KV10), open the medium-pressure hydrogen supplement program-controlled valve (KV4) and the medium-pressure filling program-controlled valve (KV9), and when the pressure rises to be lower than the pressure 1MPa displayed by the medium-pressure hydrogen supplement pressure gauge (PI6), close the medium-pressure hydrogen supplement program-controlled valve (KV4) and the medium-pressure filling program-controlled valve (KV9), open the high-pressure hydrogen supplement program-controlled valve (KV5) and the high-pressure filling program-controlled valve (KV8), and stop until the filling pressure reaches 35MPa; Pressure supplement operation: when the pressure displayed by the medium-pressure hydrogen supplement pressure gauge (PI6) is lower than 24MPa or the pressure displayed by the high-pressure hydrogen supplement pressure gauge (PI7) is lower than 37MPa, start the hydrogen supplement substation compressor (6), open the substation compressor program-controlled valve (KV3), the medium-pressure hydrogen supplement program-controlled valve (KV4) and the medium-pressure hydrogen supplement program-controlled valve (KV11), supplement the pressure of the medium-pressure hydrogen storage bottle group (7) to 30MPa, then close the medium-pressure hydrogen supplement program-controlled valve (KV4) and the medium-pressure hydrogen supplement program-controlled valve (KV11), open the high-pressure hydrogen supplement program-controlled valve (KV5), supplement the pressure of the high-pressure hydrogen storage bottle group (8) to 45MPa, and then close. Charging operation: when 30MPa long tube truck (4) needs to be filled, open 30MPa filling hand valve (V2), DCS system automatically opens substation compressor program control valve (KV3), medium pressure hydrogenation program control valve (KV11), medium pressure complementary program control valve (KV6), complementary program control valve (KV2) and 30MPa long tube truck cut-off valve (XV1), and charging pressure regulating valve (PV1) is automatically put into operation, and the pressure rate is controlled by 30MPa filling pressure gauge (PI3) to 30MPa.

7. The method of claim 6, further comprising a mother station main supply mode, wherein: Filling operation: the same as the pressurization operation in the substation main supply mode; Supplemental pressure operation: when the medium pressure hydrogen supplement pressure gauge (PI6) shows that the pressure is lower than 24MPa or the high pressure hydrogen supplement pressure gauge (PI7) shows that the pressure is lower than 37MPa, start 45MPa compressor (2), open 45MPa compressor program control valve (KV1), complementary program control valve (KV2), medium pressure hydrogen supplement program control valve (KV4) and medium pressure complementary program control valve (KV6), after the pressure of medium pressure hydrogen storage bottle group (7) is supplemented to 30MPa, close medium pressure hydrogen supplement program control valve (KV4) and medium pressure complementary program control valve (KV6), open high pressure hydrogen supplement program control valve (KV5) and high pressure complementary program control valve (KV7), and after the pressure of high pressure hydrogen storage bottle group (8) is supplemented to 45MPa, close; Charging operation: when 30MPa long tube truck (4) needs to be filled, open 30MPa filling hand valve (V2), DCS system automatically opens 45MPa compressor program control valve (KV1) and 30MPa long tube truck cut-off valve (XV1), and charging pressure regulating valve (PV1) is automatically put into operation, and the pressure rate is controlled by 30MPa filling pressure gauge (PI3) to 30MPa.

8. The method of claim 7, wherein, Further comprising using 30MPa long tube truck (4) as a buffer tank, wherein: Open 30MPa filling hand valve (V2), and DCS system automatically opens complementary program control valve (KV2), medium pressure complementary program control valve (KV6) and medium pressure hydrogenation program control valve (KV11); If the pressure of 30MPa filling pressure gauge (PI3) is lower than the pressure of medium pressure hydrogen supplement pressure gauge (PI6), open 30MPa long tube truck cut-off valve (XV1) and charging pressure regulating valve (PV1), and 30MPa long tube truck (4) is filled to the pressure of medium pressure hydrogen storage bottle group (7) according to the filling operation procedure; If the pressure of 30MPa filling pressure gauge (PI3) is higher than the pressure of medium pressure hydrogen supplement pressure gauge (PI6), supplement the pressure of medium pressure hydrogen storage bottle group (7) to be consistent with the pressure of 30MPa long tube truck (4) according to the supplemental pressure operation procedure; Open medium pressure hydrogen supplement program control valve (KV4), and connect 30MPa long tube truck (4) with medium pressure hydrogen storage bottle group (7) in series; In the substation main supply mode, when the substation compressor outlet pressure gauge (PI5) pressure is higher than 30 MPa, the medium pressure hydrogenation program valve (KV11) is automatically closed to prevent the 30 MPa long tube car (4) from overpressure, and when it is lower than 30 MPa, the medium pressure hydrogenation program valve (KV11) is automatically opened; in the main station main supply mode, when the complementary manifold pressure gauge (PI4) pressure is higher than 30 MPa, the medium pressure complementary program valve (KV6) is automatically closed to prevent the 30 MPa long tube car (4) from overpressure, and when it is lower than 30 MPa, the medium pressure complementary program valve (KV6) is automatically opened.

9. The method of claim 8, wherein: The pressure regulating valve (PV1) is connected with the 30 MPa filling pressure gauge (PI3) signal, and the pressure increasing rate is controlled at 0.1 MPa / min.

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