Sequence control system for hydrogen refueling station and control method thereof

Abstract

The invention relates to the technical field of hydrogen refueling equipment of a hydrogen refueling station, in particular to a sequence control system for the hydrogen refueling station and a control method thereof. A tank car gas direct filling process is adopted, when the use frequency of a low-pressure hydrogen storage cylinder set exceeds a threshold value, tank car gas is used for replacing the low-pressure hydrogen storage cylinder set for hydrogen filling, and in the low-pressure hydrogenation stage of a vehicle-mounted hydrogen storage cylinder, hydrogen in a gas supplementing tank car is directly filled into the vehicle-mounted hydrogen storage cylinder without being pressurized by a compressor; when the vehicle-mounted hydrogen storage cylinder is in a medium-pressure hydrogenation stage, the vehicle-mounted hydrogen storage cylinder is switched to the medium-pressure hydrogen storage cylinder group for filling; according to the invention, a bottle changing and filling process is adopted, when the hydrogen consumption is large and the tank car gas is not supplied, so that the pressure of the high-pressure hydrogen storage bottle group is lower than a preset value, the hydrogen in the medium-pressure hydrogen storage bottle group and the low-pressure hydrogen storage bottle group is pressurized by the compressor and then is supplemented into the high-pressure hydrogen storage bottle, so that the vehicle-mounted hydrogen storage bottle can be ensured to be filled with the hydrogen; and meanwhile, when any hydrogen storage bottle breaks down, other hydrogen storage bottles can be matched with the compressor to replace the broken-down hydrogen storage bottle to continue to complete the hydrogenation task.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogenation equipment for hydrogenation stations, and in particular to a sequential control system for hydrogenation stations and a control method thereof. Background Art

[0002] At most hydrogen refueling stations, hydrogen is transported by tank trucks, pressurized by compressors, and then stored in hydrogen storage cylinders installed within the station. In order to achieve rapid hydrogen refueling and improve the efficiency of the hydrogen storage cylinders, while reducing the number of compressor starts and stops, the existing technology usually groups the hydrogen storage cylinders within the station into high, medium, and low pressure groups. The hydrogen refueler first draws gas from the low-pressure hydrogen storage cylinder group. When the pressure difference between the low-pressure hydrogen storage cylinder group and the pressure inside the on-board hydrogen storage cylinder reaches the set value, the gas withdrawal stops; the hydrogen refueler switches to the medium-pressure hydrogen storage cylinder group and starts drawing gas from the medium-pressure hydrogen storage cylinder group. When the pressure difference between the medium-pressure hydrogen storage cylinder group and the pressure inside the on-board hydrogen storage cylinder reaches the set value, the gas withdrawal stops; the hydrogen refueling machine switches to the high-pressure hydrogen storage cylinder group and starts drawing gas from the high-pressure hydrogen storage cylinder group until the required filling pressure of the vehicle is reached, and then the gas withdrawal stops. When the pressure in the hydrogen storage bottle group is insufficient, the compressor needs to be started to replenish the hydrogen storage bottle group. The sequence control system unit in the existing technology is installed between the compressor and the hydrogen storage bottle group. Its function is to reasonably adjust the filling sequence when replenishing the high, medium and low pressure hydrogen storage bottle groups to achieve the optimal filling efficiency.

[0003] However, the existing hydrogen refueling sequence control scheme has the problem of low-pressure bottle groups being scrapped prematurely due to excessive frequency of use, and when the amount of hydrogen used is large and the gas from the tank truck has not arrived, the pressure of the high-pressure bottle group will first drop to below 35MPa, which will cause the on-board hydrogen storage bottle of the hydrogen fuel cell vehicle to be underfilled; at the same time, when one of the three hydrogen storage bottle groups fails or needs maintenance, all the hydrogen in the entire hydrogen storage bottle group needs to be vented, which will result in a waste of hydrogen resources. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a sequential control system and a control method for a hydrogen refueling station, which can balance the usage frequency of each hydrogen storage bottle group, improve the service life of the entire hydrogen storage bottle group, and when a single hydrogen storage bottle group fails, it will not affect the normal use of other hydrogen storage bottle groups, and can effectively avoid the waste of hydrogen resources.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: 1. A sequential control system for a hydrogen refueling station The present invention provides a sequential control system for a hydrogen refueling station, comprising a compressor 1, a hydrogen refueling machine 2, a low-pressure hydrogen storage bottle group 3, a medium-pressure hydrogen storage bottle group 4, and a high-pressure hydrogen storage bottle group 5. The input end of the compressor 1 is connected to the gas outlet end of a gas supply tank truck 6, the output end of the compressor 1 is connected to a main gas supply pipeline 8, the input end of the hydrogen refueling machine 2 is connected to a main hydrogenation pipeline 9, and the output end of the hydrogen refueling machine 2 is connected to a vehicle-mounted hydrogen storage bottle 7; The low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 are connected to the main air supply pipeline 8 in sequence through the low-pressure bottle air supply pipeline 11, the medium-pressure bottle air supply pipeline 14, and the high-pressure bottle air supply pipeline 17 respectively; and the low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 are connected to the main hydrogenation pipeline 9 in sequence through the low-pressure bottle hydrogenation pipeline 12, the medium-pressure bottle hydrogenation pipeline 15, and the high-pressure bottle hydrogenation pipeline 18 respectively; The input end of the gas replenishment tank truck 6 is also connected to the tank truck pipeline 10, and the middle part of the tank truck pipeline 10 is connected to the low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 respectively through the low-pressure bottle two-way pipeline 13, the medium-pressure bottle two-way pipeline 16, and the high-pressure bottle two-way pipeline 19.

[0006] Furthermore, the low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 are all provided with corresponding pressure measuring instruments, and the pipeline interfaces of the low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 are respectively provided with a low-pressure bottle main electric valve 21, a medium-pressure bottle main electric valve 22, and a high-pressure bottle main electric valve 23.

[0007] Furthermore, the low-pressure bottle gas supply pipeline 11, the medium-pressure bottle gas supply pipeline 14, and the high-pressure bottle gas supply pipeline 17 are respectively provided with a low-pressure bottle gas supply pipe electric valve 24, a medium-pressure bottle gas supply pipe electric valve 27, and a high-pressure bottle gas supply pipe electric valve 30; The low-pressure bottle hydrogenation pipeline 12, the medium-pressure bottle hydrogenation pipeline 15, and the high-pressure bottle hydrogenation pipeline 18 are respectively provided with a low-pressure bottle hydrogenation pipe electric valve 25, a medium-pressure bottle hydrogenation pipe electric valve 28, and a high-pressure bottle hydrogenation pipe electric valve 31; The low-pressure bottle two-way pipe 13, the medium-pressure bottle two-way pipe 16, and the high-pressure bottle two-way pipe 19 are respectively provided with a low-pressure bottle two-way pipe electric valve 26, a medium-pressure bottle two-way pipe electric valve 29, and a high-pressure bottle two-way pipe electric valve 32.

[0008] Furthermore, the low-pressure bottle air supply pipeline 11, the medium-pressure bottle air supply pipeline 14, and the high-pressure bottle air supply pipeline 17 are respectively provided with a low-pressure bottle air supply pipe one-way valve 33, a medium-pressure bottle air supply pipe one-way valve 34, and a high-pressure bottle air supply pipe one-way valve 35.

[0009] Furthermore, the low-pressure bottle hydrogenation pipeline 12, the medium-pressure bottle hydrogenation pipeline 15, and the high-pressure bottle hydrogenation pipeline 18 are respectively provided with a low-pressure bottle hydrogenation pipe one-way valve 36, a medium-pressure bottle hydrogenation pipe one-way valve 37, and a high-pressure bottle hydrogenation pipe one-way valve 38.

[0010] Furthermore, a tank truck pipeline one-way valve 39 is provided at the front of the tank truck pipeline 10 , and both ends of the tank truck pipeline one-way valve 39 are connected through a parallel return air pipeline 20 , and a return air pipe regulating valve 40 is provided on the return air pipeline 20 .

[0011] 2. A control method for a sequential control system used in a hydrogen refueling station Based on the same inventive concept, the present invention also provides a control method for the sequential control system for the hydrogen refueling station as described above, which specifically includes the following steps: S1: When the pressure difference between the low-pressure hydrogen storage bottle group and the vehicle-mounted hydrogen storage bottle is less than the set pressure difference value, the hydrogen refueling machine first draws gas from the low-pressure hydrogen storage bottle group; S2, determine whether the current low-pressure hydrogen storage bottle group working times exceeds the preset times threshold, if so, enter the tank truck gas direct charging mode, if not, continue to step S3; S3: When the pressure difference between the low-pressure hydrogen storage bottle group and the on-board hydrogen storage bottle reaches the set pressure difference value, the hydrogen refueling machine stops taking gas from the low-pressure hydrogen storage bottle group and switches to taking gas from the medium-pressure hydrogen storage bottle group; S4: When the pressure difference between the medium-pressure hydrogen storage bottle group and the on-board hydrogen storage bottle reaches the set pressure difference value, the hydrogen refueling machine stops taking gas from the medium-pressure hydrogen storage bottle group and switches to taking gas from the high-pressure hydrogen storage bottle group; S5, determine whether the on-board hydrogen storage tank has reached the required filling pressure. If so, the hydrogen filling machine stops taking gas. If not, continue to step S6; S6, determine whether the current pressure in the high-pressure hydrogen storage bottle group is lower than the preset pressure threshold. If so, enter the bottle replacement and filling mode. If not, the hydrogen filling machine continues to take gas from the high-pressure hydrogen storage bottle group.

[0012] Furthermore, the tank truck direct gas charging mode is specifically as follows: Close the low-pressure bottle main electric valve 21, and open the low-pressure bottle two-way pipe electric valve 26 and the low-pressure bottle hydrogenation pipe electric valve 25, so that the hydrogen in the gas tank truck can directly flow from the tank truck pipeline 10 through the low-pressure bottle two-way pipeline 13 and the low-pressure bottle hydrogenation pipeline 12 in sequence, and then be filled into the on-board hydrogen storage bottle 7 by the hydrogenator 2.

[0013] Furthermore, the bottle replacement and filling mode is specifically as follows: The hydrogen stored in the low-pressure hydrogen storage bottle group 3 and the medium-pressure hydrogen storage bottle group 4 flows into the tank truck pipeline 10 through the low-pressure bottle two-way pipeline 13 and the medium-pressure bottle two-way pipeline 16 respectively, and flows back to the inlet of the compressor 1 through the return air pipeline 20. Then, the hydrogen is pressurized by the compressor 1 to the gas storage pressure value corresponding to the high-pressure hydrogen storage bottle group, and then replenished into the high-pressure hydrogen storage bottle 5 through the high-pressure bottle gas replenishing pipeline 17.

[0014] Furthermore, when a failure occurs in the low-pressure hydrogen storage bottle group 3, the system directly enters the tank truck gas direct charging mode and performs maintenance on the low-pressure hydrogen storage bottle group 3; When the medium-pressure hydrogen storage bottle group 4 fails, the medium-pressure bottle main electric valve 22 is closed, and the medium-pressure hydrogen storage bottle group 4 is repaired. At the same time, the hydrogen stored in the low-pressure hydrogen storage bottle group 3 flows from the low-pressure bottle two-way pipeline 13 into the tank truck pipeline 10, and flows back to the inlet of the compressor 1 through the return air pipeline 20. Then, the hydrogen is pressurized by the compressor 1 to the gas storage pressure value corresponding to the medium-pressure hydrogen storage bottle group, and then flows into the main hydrogenation pipeline 9 through the medium-pressure bottle air supply pipeline 14 and the medium-pressure bottle hydrogenation pipeline 15 in sequence; When the high-pressure hydrogen storage bottle group 5 fails, the high-pressure bottle main electric valve 23 is closed, and the high-pressure hydrogen storage bottle group 5 is repaired. At the same time, the hydrogen stored in the medium-pressure hydrogen storage bottle group 4 flows into the tank truck pipeline 10 through the medium-pressure bottle two-way pipeline 16, and flows back to the inlet of the compressor 1 through the return air pipeline 20. Then, the hydrogen is pressurized to the gas storage pressure value corresponding to the high-pressure hydrogen storage bottle group through the compressor 1, and then flows into the main hydrogenation pipeline 9 through the high-pressure bottle air supply pipeline 17 and the high-pressure bottle hydrogenation pipeline 18 in sequence.

[0015] Compared with the prior art, the present invention has the following main advantages: 1. The present invention adopts a tank truck gas direct charging process. When the use frequency of the low-pressure hydrogen storage bottle group exceeds a threshold, the tank truck gas is used to replace the low-pressure hydrogen storage bottle group for hydrogen filling. During the low-pressure hydrogenation stage of the on-board hydrogen storage bottle, the hydrogen in the gas tank truck is directly charged into the on-board hydrogen storage bottle without being pressurized by a compressor. When the on-board hydrogen storage bottle is in the medium-pressure hydrogenation stage, the filling is switched to the medium-pressure hydrogen storage bottle group. This can effectively reduce the use of the low-pressure hydrogen storage bottle group, balance the use frequency of each hydrogen storage bottle group, and thus improve the service life of the entire hydrogen storage bottle group. 2. The present invention adopts a bottle replacement and filling process. When the amount of hydrogen used is large and the tank truck has not arrived, causing the pressure of the high-pressure hydrogen storage bottle group to be lower than the preset value, the hydrogen in the medium and low-pressure hydrogen storage bottle groups is pressurized by the compressor and then added to the high-pressure hydrogen storage bottle, thereby ensuring that the on-board hydrogen storage bottle is filled with hydrogen; at the same time, when any hydrogen storage bottle fails, other hydrogen storage bottles can be used in conjunction with the compressor to replace the faulty hydrogen storage bottle to continue to complete the hydrogenation task, and there is no need to empty the entire hydrogen storage bottle group during maintenance, which can effectively avoid waste of hydrogen resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is an overall schematic diagram of a sequential control system for a hydrogen refueling station according to an embodiment of the present invention; Figure 2 Flowchart of a control method in an embodiment of the present invention.

[0017] In the figure: 1. Compressor; 2. Hydrogenator; 3. Low-pressure hydrogen storage bottle group; 4. Medium-pressure hydrogen storage bottle group; 5. High-pressure hydrogen storage bottle group; 6. Gas supply tank truck; 7. On-board hydrogen storage bottle; 8. Main gas supply line; 9. Main hydrogenation line; 10. Tank truck line; 11. Low-pressure bottle gas supply line; 12. Low-pressure bottle hydrogenation line; 13. Low-pressure bottle two-way line; 14. Medium-pressure bottle gas supply line; 15. Medium-pressure bottle hydrogenation line; 16. Medium-pressure bottle two-way line; 17. High-pressure bottle gas supply line; 18. High-pressure bottle hydrogenation line; 19. High-pressure bottle two-way line; 20. Return gas line; 21. Low-pressure bottle main electric valve; 22. Medium-pressure bottle main electric valve; 23. High-pressure bottle main electric valve 1. Electric valve for low-pressure bottle air supply pipe; 2. Electric valve for low-pressure bottle hydrogenation pipe; 2. Electric valve for low-pressure bottle two-way pipe; 2. Electric valve for medium-pressure bottle air supply pipe; 2. Electric valve for medium-pressure bottle hydrogenation pipe; 2. Electric valve for medium-pressure bottle two-way pipe; 3. Electric valve for high-pressure bottle air supply pipe; 3. Electric valve for high-pressure bottle hydrogenation pipe; 3. Electric valve for high-pressure bottle two-way pipe; 3. One-way valve for low-pressure bottle air supply pipe; 3. One-way valve for medium-pressure bottle air supply pipe; 3. One-way valve for high-pressure bottle air supply pipe; 3. One-way valve for low-pressure bottle hydrogenation pipe; 3. One-way valve for medium-pressure bottle hydrogenation pipe; 3. One-way valve for high-pressure bottle hydrogenation pipe; 3. One-way valve for tank truck pipe; 40. Regulating valve for return air pipe. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0019] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0020] Example 1: This embodiment provides a sequential control system for a hydrogen refueling station. Figure 1 As shown, it mainly includes: a compressor 1, a hydrogenator 2, a low-pressure hydrogen storage bottle group 3, a medium-pressure hydrogen storage bottle group 4 and a high-pressure hydrogen storage bottle group 5; The input end of the compressor 1 is connected to the gas outlet end of the gas supply tank truck 6, the output end of the compressor 1 is connected to the main gas supply pipeline 8, the input end of the hydrogenator 2 is connected to the main hydrogenation pipeline 9, and the output end of the hydrogenator 2 is connected to the on-board hydrogen storage bottle 7; The low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 are connected to the main air supply pipeline 8 in sequence through the low-pressure bottle air supply pipeline 11, the medium-pressure bottle air supply pipeline 14, and the high-pressure bottle air supply pipeline 17 respectively; and the low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 are connected to the main hydrogenation pipeline 9 in sequence through the low-pressure bottle hydrogenation pipeline 12, the medium-pressure bottle hydrogenation pipeline 15, and the high-pressure bottle hydrogenation pipeline 18 respectively; The input end of the gas replenishment tank truck 6 is also connected to the tank truck pipeline 10, and the middle part of the tank truck pipeline 10 is connected to the low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 respectively through the low-pressure bottle two-way pipeline 13, the medium-pressure bottle two-way pipeline 16, and the high-pressure bottle two-way pipeline 19.

[0021] Furthermore, the low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 are all provided with corresponding pressure measuring instruments, and the pipeline interfaces of the low-pressure hydrogen storage bottle group 3, the medium-pressure hydrogen storage bottle group 4, and the high-pressure hydrogen storage bottle group 5 are respectively provided with a low-pressure bottle main electric valve 21, a medium-pressure bottle main electric valve 22, and a high-pressure bottle main electric valve 23.

[0022] Furthermore, the low-pressure bottle gas supply pipeline 11, the medium-pressure bottle gas supply pipeline 14, and the high-pressure bottle gas supply pipeline 17 are respectively provided with a low-pressure bottle gas supply pipe electric valve 24, a medium-pressure bottle gas supply pipe electric valve 27, and a high-pressure bottle gas supply pipe electric valve 30; The low-pressure bottle hydrogenation pipeline 12, the medium-pressure bottle hydrogenation pipeline 15, and the high-pressure bottle hydrogenation pipeline 18 are respectively provided with a low-pressure bottle hydrogenation pipe electric valve 25, a medium-pressure bottle hydrogenation pipe electric valve 28, and a high-pressure bottle hydrogenation pipe electric valve 31; The low-pressure bottle two-way pipe 13, the medium-pressure bottle two-way pipe 16, and the high-pressure bottle two-way pipe 19 are respectively provided with a low-pressure bottle two-way pipe electric valve 26, a medium-pressure bottle two-way pipe electric valve 29, and a high-pressure bottle two-way pipe electric valve 32.

[0023] Furthermore, the low-pressure bottle air supply pipeline 11, the medium-pressure bottle air supply pipeline 14, and the high-pressure bottle air supply pipeline 17 are respectively provided with a low-pressure bottle air supply pipe one-way valve 33, a medium-pressure bottle air supply pipe one-way valve 34, and a high-pressure bottle air supply pipe one-way valve 35.

[0024] Furthermore, the low-pressure bottle hydrogenation pipeline 12, the medium-pressure bottle hydrogenation pipeline 15, and the high-pressure bottle hydrogenation pipeline 18 are respectively provided with a low-pressure bottle hydrogenation pipe one-way valve 36, a medium-pressure bottle hydrogenation pipe one-way valve 37, and a high-pressure bottle hydrogenation pipe one-way valve 38.

[0025] Furthermore, a tank truck pipeline one-way valve 39 is provided at the front of the tank truck pipeline 10 , and both ends of the tank truck pipeline one-way valve 39 are connected through a parallel return air pipeline 20 , and a return air pipe regulating valve 40 is provided on the return air pipeline 20 .

[0026] Example 2. This embodiment provides a sequential control system for a hydrogen refueling station. The tank truck gas direct filling process is specifically as follows: when the usage frequency of the low-pressure hydrogen storage bottle group exceeds a threshold, unpressurized tank truck gas (20Mpa~30MPa) is used to replace the low-pressure hydrogen storage bottle group for hydrogen filling; in the low-pressure hydrogen filling stage of the on-board hydrogen storage bottle, the hydrogen in the gas tank truck is directly filled into the on-board hydrogen storage bottle without being pressurized by a compressor. When the on-board hydrogen storage bottle is filled to the medium-pressure hydrogen filling stage, it is switched to the medium-pressure hydrogen storage bottle group to continue subsequent filling.

[0027] Furthermore, the bottle replacement and filling process is specifically as follows: when the hydrogen filling task is large and the tank truck has not arrived, causing the pressure of the high-pressure bottle group to drop below 35MPa, the hydrogen in the medium and low-pressure hydrogen storage bottle groups is pressurized by the compressor and then directly filled into the on-board hydrogen storage bottle (or pressurized and then filled into the high-pressure bottle group for storage); Furthermore, when a low-pressure hydrogen storage bottle fails, the gas from the tank truck can be directly used to fill the on-board hydrogen storage bottle without being pressurized by a compressor to replace the failed low-pressure hydrogen storage bottle and continue to complete the hydrogen refueling task. At the same time, the low-pressure hydrogen storage bottle pipeline valve can be closed and the low-pressure hydrogen storage bottle can be repaired; Furthermore, when a medium-pressure hydrogen storage bottle fails, the hydrogen in the low-pressure hydrogen storage bottle group is pressurized by the compressor to the pressure required for the medium-pressure hydrogenation stage and then filled into the on-board hydrogen storage bottle to replace the failed medium-pressure hydrogen storage bottle to continue to complete the hydrogenation task. At the same time, the pipeline valve of the medium-pressure hydrogen storage bottle can be closed and the medium-pressure hydrogen storage bottle can be repaired; Furthermore, when a medium-pressure hydrogen storage bottle fails, the hydrogen in the low-pressure hydrogen storage bottle group is pressurized by a compressor to the pressure required for the medium-pressure hydrogen refueling stage and filled into the on-board hydrogen storage bottle to replace the failed medium-pressure hydrogen storage bottle to continue to complete the hydrogen refueling task. At the same time, the medium-pressure hydrogen storage bottle pipeline valve can be closed and the medium-pressure hydrogen storage bottle can be inspected and repaired.

[0028] Example 3: Based on the same inventive concept, this embodiment further provides a control method for the sequential control system for a hydrogen refueling station as described above, specifically comprising the following steps: S1: When the pressure difference between the low-pressure hydrogen storage bottle group and the vehicle-mounted hydrogen storage bottle is less than the set pressure difference value, the hydrogen refueling machine first draws gas from the low-pressure hydrogen storage bottle group; S2, determine whether the current low-pressure hydrogen storage bottle group working times exceeds the preset times threshold, if so, enter the tank truck gas direct charging mode, if not, continue to step S3; S3: When the pressure difference between the low-pressure hydrogen storage bottle group and the on-board hydrogen storage bottle reaches the set pressure difference value, the hydrogen refueling machine stops taking gas from the low-pressure hydrogen storage bottle group and switches to taking gas from the medium-pressure hydrogen storage bottle group; S4: When the pressure difference between the medium-pressure hydrogen storage bottle group and the on-board hydrogen storage bottle reaches the set pressure difference value, the hydrogen refueling machine stops taking gas from the medium-pressure hydrogen storage bottle group and switches to taking gas from the high-pressure hydrogen storage bottle group; S5, determine whether the on-board hydrogen storage tank has reached the required filling pressure. If so, the hydrogen filling machine stops taking gas. If not, continue to step S6; S6, determine whether the current pressure in the high-pressure hydrogen storage bottle group is lower than the preset pressure threshold. If so, enter the bottle replacement and filling mode. If not, the hydrogen filling machine continues to take gas from the high-pressure hydrogen storage bottle group.

[0029] The tank truck direct gas charging mode is specifically as follows: Close the low-pressure bottle main electric valve 21, and open the low-pressure bottle two-way pipe electric valve 26 and the low-pressure bottle hydrogenation pipe electric valve 25, so that the hydrogen in the gas tank truck can directly flow from the tank truck pipeline 10 through the low-pressure bottle two-way pipeline 13 and the low-pressure bottle hydrogenation pipeline 12 in sequence, and then be filled into the on-board hydrogen storage bottle 7 by the hydrogenator 2.

[0030] Furthermore, the bottle replacement and filling mode is specifically as follows: The hydrogen stored in the low-pressure hydrogen storage bottle group 3 and the medium-pressure hydrogen storage bottle group 4 flows into the tank truck pipeline 10 through the low-pressure bottle two-way pipeline 13 and the medium-pressure bottle two-way pipeline 16 respectively, and flows back to the inlet of the compressor 1 through the return air pipeline 20. Then, the hydrogen is pressurized by the compressor 1 to the gas storage pressure value corresponding to the high-pressure hydrogen storage bottle group, and then replenished into the high-pressure hydrogen storage bottle 5 through the high-pressure bottle gas replenishing pipeline 17.

[0031] Furthermore, when a failure occurs in the low-pressure hydrogen storage bottle group 3, the system directly enters the tank truck gas direct charging mode and performs maintenance on the low-pressure hydrogen storage bottle group 3; When the medium-pressure hydrogen storage bottle group 4 fails, the medium-pressure bottle main electric valve 22 is closed, and the medium-pressure hydrogen storage bottle group 4 is repaired. At the same time, the hydrogen stored in the low-pressure hydrogen storage bottle group 3 flows from the low-pressure bottle two-way pipeline 13 into the tank truck pipeline 10, and flows back to the inlet of the compressor 1 through the return air pipeline 20. Then, the hydrogen is pressurized by the compressor 1 to the gas storage pressure value corresponding to the medium-pressure hydrogen storage bottle group, and then flows into the main hydrogenation pipeline 9 through the medium-pressure bottle air supply pipeline 14 and the medium-pressure bottle hydrogenation pipeline 15 in sequence; When the high-pressure hydrogen storage bottle group 5 fails, the high-pressure bottle main electric valve 23 is closed, and the high-pressure hydrogen storage bottle group 5 is repaired. At the same time, the hydrogen stored in the medium-pressure hydrogen storage bottle group 4 flows into the tank truck pipeline 10 through the medium-pressure bottle two-way pipeline 16, and flows back to the inlet of the compressor 1 through the return air pipeline 20. Then, the hydrogen is pressurized to the gas storage pressure value corresponding to the high-pressure hydrogen storage bottle group through the compressor 1, and then flows into the main hydrogenation pipeline 9 through the high-pressure bottle air supply pipeline 17 and the high-pressure bottle hydrogenation pipeline 18 in sequence.

[0032] Furthermore, all parts of this application that are not described in detail are the same as the existing technology or are implemented using the existing technology.

[0033] In summary: 1. The present invention adopts a tank truck gas direct charging process. When the use frequency of the low-pressure hydrogen storage bottle group exceeds a threshold, the tank truck gas is used to replace the low-pressure hydrogen storage bottle group for hydrogen filling. During the low-pressure hydrogenation stage of the on-board hydrogen storage bottle, the hydrogen in the gas tank truck is directly charged into the on-board hydrogen storage bottle without being pressurized by a compressor. When the on-board hydrogen storage bottle is in the medium-pressure hydrogenation stage, the filling is switched to the medium-pressure hydrogen storage bottle group. This can effectively reduce the use of the low-pressure hydrogen storage bottle group, balance the use frequency of each hydrogen storage bottle group, and thus improve the service life of the entire hydrogen storage bottle group. 2. The present invention adopts a bottle replacement and filling process. When the amount of hydrogen used is large and the tank truck has not arrived, causing the pressure of the high-pressure hydrogen storage bottle group to be lower than the preset value, the hydrogen in the medium and low-pressure hydrogen storage bottle groups is pressurized by the compressor and then added to the high-pressure hydrogen storage bottle, thereby ensuring that the on-board hydrogen storage bottle is filled with hydrogen; at the same time, when any hydrogen storage bottle fails, other hydrogen storage bottles can be used in conjunction with the compressor to replace the faulty hydrogen storage bottle to continue to complete the hydrogenation task, and there is no need to empty the entire hydrogen storage bottle group during maintenance, which can effectively avoid waste of hydrogen resources.

[0034] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sequential control system for a hydrogen refueling station, characterized in that: The invention comprises a compressor (1), a hydrogenator (2), a low-pressure hydrogen storage bottle group (3), a medium-pressure hydrogen storage bottle group (4) and a high-pressure hydrogen storage bottle group (5), wherein the input end of the compressor (1) is connected to the gas outlet end of the gas supply tank truck (6), the output end of the compressor (1) is connected to the main gas supply pipeline (8), the input end of the hydrogenator (2) is connected to the main hydrogenation pipeline (9), and the output end of the hydrogenator (2) is connected to the on-board hydrogen storage bottle (7); The low-pressure hydrogen storage bottle group (3), the medium-pressure hydrogen storage bottle group (4), and the high-pressure hydrogen storage bottle group (5) are connected to the main air supply pipeline (8) in sequence through the low-pressure bottle air supply pipeline (11), the medium-pressure bottle air supply pipeline (14), and the high-pressure bottle air supply pipeline (17); and the low-pressure hydrogen storage bottle group (3), the medium-pressure hydrogen storage bottle group (4), and the high-pressure hydrogen storage bottle group (5) are connected to the main hydrogenation pipeline (9) in sequence through the low-pressure bottle hydrogenation pipeline (12), the medium-pressure bottle hydrogenation pipeline (15), and the high-pressure bottle hydrogenation pipeline (18); The input end of the gas supply tank truck (6) is also connected to a tank truck pipeline (10), and the middle part of the tank truck pipeline (10) is connected to the low-pressure hydrogen storage bottle group (3), the medium-pressure hydrogen storage bottle group (4), and the high-pressure hydrogen storage bottle group (5) respectively through a low-pressure bottle two-way pipeline (13), a medium-pressure bottle two-way pipeline (16), and a high-pressure bottle two-way pipeline (19).

2. A sequential control system for a hydrogen refueling station according to claim 1, characterized in that: The low-pressure hydrogen storage bottle group (3), the medium-pressure hydrogen storage bottle group (4), and the high-pressure hydrogen storage bottle group (5) are all provided with corresponding pressure measuring instruments, and the pipeline interfaces of the low-pressure hydrogen storage bottle group (3), the medium-pressure hydrogen storage bottle group (4), and the high-pressure hydrogen storage bottle group (5) are respectively provided with a low-pressure bottle main electric valve (21), a medium-pressure bottle main electric valve (22), and a high-pressure bottle main electric valve (23).

3. A sequential control system for a hydrogen refueling station according to claim 1, characterized in that: The low-pressure bottle air supply pipeline (11), the medium-pressure bottle air supply pipeline (14), and the high-pressure bottle air supply pipeline (17) are respectively provided with a low-pressure bottle air supply pipe electric valve (24), a medium-pressure bottle air supply pipe electric valve (27), and a high-pressure bottle air supply pipe electric valve (30); The low-pressure bottle hydrogenation pipeline (12), the medium-pressure bottle hydrogenation pipeline (15), and the high-pressure bottle hydrogenation pipeline (18) are respectively provided with a low-pressure bottle hydrogenation pipe electric valve (25), a medium-pressure bottle hydrogenation pipe electric valve (28), and a high-pressure bottle hydrogenation pipe electric valve (31); The low-pressure bottle two-way pipe (13), the medium-pressure bottle two-way pipe (16), and the high-pressure bottle two-way pipe (19) are respectively provided with a low-pressure bottle two-way pipe electric valve (26), a medium-pressure bottle two-way pipe electric valve (29), and a high-pressure bottle two-way pipe electric valve (32).

4. A sequential control system for a hydrogen refueling station according to claim 3, characterized in that: The low-pressure bottle air supply pipeline (11), the medium-pressure bottle air supply pipeline (14), and the high-pressure bottle air supply pipeline (17) are further provided with a low-pressure bottle air supply pipe one-way valve (33), a medium-pressure bottle air supply pipe one-way valve (34), and a high-pressure bottle air supply pipe one-way valve (35), respectively.

5. A sequential control system for a hydrogen refueling station according to claim 4, characterized in that: The low-pressure bottle hydrogenation pipeline (12), the medium-pressure bottle hydrogenation pipeline (15), and the high-pressure bottle hydrogenation pipeline (18) are further provided with a low-pressure bottle hydrogenation pipe check valve (36), a medium-pressure bottle hydrogenation pipe check valve (37), and a high-pressure bottle hydrogenation pipe check valve (38), respectively.

6. A sequential control system for a hydrogen refueling station according to claim 1, characterized in that: A tank truck pipeline one-way valve (39) is provided at the front of the tank truck pipeline (10), and both ends of the tank truck pipeline one-way valve (39) are connected via a parallel return air pipeline (20), and a return air pipeline regulating valve (40) is provided on the return air pipeline (20).

7. A control method for a sequential control system for a hydrogen refueling station according to any one of claims 1 to 6, characterized in that: The steps include: S1: When the pressure difference between the low-pressure hydrogen storage bottle group and the vehicle-mounted hydrogen storage bottle is less than the set pressure difference value, the hydrogen refueling machine first draws gas from the low-pressure hydrogen storage bottle group; S2, determine whether the current low-pressure hydrogen storage bottle group working times exceeds the preset times threshold, if so, enter the tank truck gas direct charging mode, if not, continue to step S3; S3: When the pressure difference between the low-pressure hydrogen storage bottle group and the on-board hydrogen storage bottle reaches the set pressure difference value, the hydrogen refueling machine stops taking gas from the low-pressure hydrogen storage bottle group and switches to taking gas from the medium-pressure hydrogen storage bottle group; S4: When the pressure difference between the medium-pressure hydrogen storage bottle group and the on-board hydrogen storage bottle reaches the set pressure difference value, the hydrogen refueling machine stops taking gas from the medium-pressure hydrogen storage bottle group and switches to taking gas from the high-pressure hydrogen storage bottle group; S5, determine whether the on-board hydrogen storage tank has reached the required filling pressure. If so, the hydrogen filling machine stops taking gas. If not, continue to step S6; S6, determine whether the current pressure in the high-pressure hydrogen storage bottle group is lower than the preset pressure threshold. If so, enter the bottle replacement and filling mode. If not, the hydrogen filling machine continues to take gas from the high-pressure hydrogen storage bottle group.

8. The control method according to claim 7, characterized in that: The tank truck direct gas charging mode is specifically as follows: Close the low-pressure bottle main electric valve (21), and open the low-pressure bottle two-way pipe electric valve (26) and the low-pressure bottle hydrogenation pipe electric valve (25), so that the hydrogen in the gas tank truck directly flows from the tank truck pipeline (10) through the low-pressure bottle two-way pipeline (13) and the low-pressure bottle hydrogenation pipeline (12) in sequence, and then is filled into the on-board hydrogen storage bottle (7) by the hydrogenator (2).

9. The control method according to claim 7, characterized in that: The bottle replacement and filling mode is specifically as follows: The hydrogen stored in the low-pressure hydrogen storage bottle group (3) and the medium-pressure hydrogen storage bottle group (4) flows into the tank truck pipeline (10) through the low-pressure bottle two-way pipeline (13) and the medium-pressure bottle two-way pipeline (16), and flows back to the inlet of the compressor (1) through the return air pipeline (20). Then, the hydrogen is pressurized to the gas storage pressure value corresponding to the high-pressure hydrogen storage bottle group by the compressor (1), and then replenished into the high-pressure hydrogen storage bottle (5) through the high-pressure bottle gas replenishing pipeline (17).

10. The control method according to claim 8, characterized in that: When a fault occurs in the low-pressure hydrogen storage bottle group (3), the tank truck gas direct charging mode is directly entered, and the low-pressure hydrogen storage bottle group (3) is repaired; When the medium-pressure hydrogen storage bottle group (4) fails, the medium-pressure bottle main electric valve (22) is closed, and the medium-pressure hydrogen storage bottle group (4) is repaired, and at the same time, the hydrogen stored in the low-pressure hydrogen storage bottle group (3) flows from the low-pressure bottle two-way pipeline (13) into the tank car pipeline (10), and flows back to the compressor (1) inlet through the return air pipeline (20), and then the hydrogen is pressurized to the gas storage pressure value corresponding to the medium-pressure hydrogen storage bottle group by the compressor (1), and then flows into the main hydrogenation pipeline (9) through the medium-pressure bottle air supply pipeline (14) and the medium-pressure bottle hydrogenation pipeline (15); When the high-pressure hydrogen storage bottle group (5) fails, the high-pressure bottle main electric valve (23) is closed, and the high-pressure hydrogen storage bottle group (5) is repaired. At the same time, the hydrogen stored in the medium-pressure hydrogen storage bottle group (4) flows from the medium-pressure bottle two-way pipeline (16) into the tank truck pipeline (10), and flows back to the inlet of the compressor (1) through the return air pipeline (20). Then, the hydrogen is pressurized to the gas storage pressure value corresponding to the high-pressure hydrogen storage bottle group by the compressor (1), and then flows into the main hydrogenation pipeline (9) through the high-pressure bottle air supply pipeline (17) and the high-pressure bottle hydrogenation pipeline (18) in sequence.

Images