Distributed hydrogen refueling station pipeline hydrogen recovery device and method thereof

Abstract

The invention discloses a distributed hydrogen refueling station pipeline hydrogen recovery device and a method thereof.The device comprises a pneumatic valve, a one-way valve, a solid hydrogen storage bottle and a pressure sensor, a gas inlet of the pipeline hydrogen recovery device is connected with a high-pressure pipeline of a pressurization system, and a gas release opening of the pipeline hydrogen recovery device is connected with a solid hydrogen storage and supply module; a solid hydrogen storage bottle is arranged between the gas inlet and the gas release port of the pipeline hydrogen recovery device, and a heat exchange mechanism is arranged outside the solid hydrogen storage bottle. The temperature of the solid hydrogen storage cylinder is reduced through the heat exchange mechanism, high-pressure hydrogen in the pipeline is released to the solid hydrogen storage cylinder for absorption and storage, the pressure of the hydrogen in the pipeline is lower than the pressure allowed by restarting of the booster pump, and then the temperature of the solid hydrogen storage cylinder is increased so that the pressure of the hydrogen in the solid hydrogen storage cylinder can be increased to exceed the pressure of the solid hydrogen storage and supply module. And the hydrogen in the solid hydrogen storage cylinder is released and stored in the solid hydrogen storage and supply module, so that recycling is realized.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen energy application, and in particular to a distributed hydrogen refueling station pipeline hydrogen recovery device and a method thereof. Background Art

[0002] The construction of hydrogen refueling stations is a key infrastructure project for the commercial application of hydrogen energy in the transportation field. Hydrogen refueling station equipment usually consists of boosting equipment, hydrogen storage towers, hydrogen refueling equipment and related control equipment. At present, the construction of hydrogen refueling stations faces problems such as high investment, great safety risks, large land area, and difficult approval.

[0003] Patent CN222209925U discloses a distributed hydrogenation device based on solid-state hydrogen storage technology. It uses solid-state hydrogen storage to store hydrogen and combines it with a booster to provide a safe and reliable hydrogenation device. This type of hydrogenation equipment usually requires the booster to be frequently started and stopped during operation, and the pipeline pressure needs to be unloaded before the booster is restarted. The currently commonly used unloading method is direct emptying, which brings safety hazards to the use environment and also reduces the utilization efficiency of hydrogen energy. Considering that the pressure allowed before the booster is restarted is much lower than the room temperature hydrogen supply pressure of the solid-state hydrogen storage hydrogen supply module, the pipeline hydrogen cannot be directly discharged to the solid-state hydrogen storage hydrogen supply module to obtain the pressure level allowed before the booster is restarted. Summary of the invention

[0004] The object of the present invention is to provide a distributed hydrogen refueling station pipeline hydrogen recovery device and method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a distributed hydrogen refueling station pipeline hydrogen recovery device, including a pneumatic valve, a one-way valve, a solid-state hydrogen storage bottle and a pressure sensor, wherein the air inlet of the pipeline hydrogen recovery device is connected to the high-pressure pipeline of the boosting system, and the air outlet is connected to the solid-state hydrogen storage and hydrogen supply module, and a solid-state hydrogen storage bottle is arranged between the air inlet and the air outlet of the pipeline hydrogen recovery device, and the solid-state hydrogen storage bottle has an external heat exchange mechanism.

[0006] Preferably, the air inlet of the pipeline hydrogen recovery device is connected to the high-pressure pipeline of the boosting system, and the air outlet is connected to the solid-state hydrogen storage and supply module.

[0007] Preferably, a solid hydrogen storage bottle is arranged between the air inlet and the air outlet of the pipeline hydrogen recovery device, and a pneumatic valve, a one-way valve and a pressure sensor are respectively installed on the connecting pipeline between the solid hydrogen storage bottle and the air inlet and the air outlet.

[0008] Preferably, the solid-state hydrogen storage bottle is provided with an external heat exchange mechanism, and the solid-state hydrogen storage bottle is heated or cooled by the heat exchange mechanism.

[0009] In addition, the present invention also provides a hydrogen recovery method for a hydrogen recovery device of a distributed hydrogen refueling station pipeline, which is characterized in that the hydrogen recovery method includes the following steps:

[0010] S1: Lower the temperature of the solid hydrogen storage bottle through the heat exchange mechanism, open the pneumatic switch valve, and the solid hydrogen storage bottle starts to absorb hydrogen. When the pipeline hydrogen pressure is lower than the pressure allowed for the booster pump to start again, close the pneumatic switch valve;

[0011] S2: Raise the temperature of the solid hydrogen storage bottle through the heat exchange mechanism. When the hydrogen pressure in the solid hydrogen storage bottle rises above the pressure of the solid hydrogen storage hydrogen supply module, open the pneumatic switch valve and relieve the pressure of the hydrogen in the solid hydrogen storage bottle to the solid hydrogen storage hydrogen supply module for storage;

[0012] S3: Repeat S1 and S2 in sequence to continuously recover and utilize the high-pressure pipeline hydrogen at the outlet end of the booster pump;

[0013] Preferably, the pressure allowed for the booster pump to start again in S1 is less than 1 MPa, and the room temperature hydrogen supply pressure of the solid hydrogen storage hydrogen supply module is greater than 3 MPa.

[0014] Preferably, the room temperature hydrogen absorption pressure of the solid hydrogen storage bottle in S1 is less than 1 MPa.

[0015] In summary, the beneficial effects of the present invention are as follows:

[0016] By setting a hydrogen recovery bypass on the high-pressure pipeline of the distributed hydrogen refueling station, the present invention enables the solid hydrogen storage bottle to absorb the hydrogen released by the pressure relief of the high-pressure pipeline by reducing the temperature through the heat exchanger, so that the pipeline pressure after pressure relief drops to the pressure allowed for the booster pump to restart. By raising the temperature through the heat exchanger, the pressure of the solid hydrogen storage bottle exceeds the pressure of the solid hydrogen storage hydrogen supply module, and the hydrogen stored in the solid hydrogen storage bottle is discharged to the solid hydrogen storage hydrogen supply module for recovery and utilization. Hydrogen is not directly discharged to the outside during the whole process, improving the use safety of the equipment. At the same time, the discharged hydrogen is recovered and utilized, which can improve the utilization efficiency of hydrogen energy. The present invention can reasonably select the room temperature hydrogen absorption pressure of the solid hydrogen storage bottle according to the pressure level of the high-pressure pipeline and the pressure level of the recovery hydrogen supply end to meet the requirements of various working conditions, so as to flexibly configure various working scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1Schematic diagram of the overall framework structure of a distributed hydrogen refueling station pipeline hydrogen recovery device and its recovery method according to the present invention;

[0019] The markings in the attached drawings are described separately as follows: 1 - Solid hydrogen storage and hydrogen supply module; 2-1, 2, 3 - Pneumatic switch valves; 3 - Diaphragm booster pump; 4 - Hydrogen condenser; 5-1, 2, 3 - Pressure sensors; 6 - Safety valve; 7 - Three-way pipe joint; 8-1, 2, 3 - Check valves; 9 - Solid hydrogen storage bottle; 10 - Heat exchange mechanism; 11 - Temperature sensor. Detailed implementation manners

[0020] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0021] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features.

[0022] The following combines Figure 1 A detailed description of the present invention is given. An embodiment provided by the present invention: The distributed hydrogen refueling station pipeline hydrogen recovery device includes pneumatic valves (2-2, 2-3), check valves (8-2, 8-3), a solid hydrogen storage bottle (9), and pressure sensors (5-2, 5-3). The intake port of the pipeline hydrogen recovery device is connected to the high-pressure pipeline of the booster system, and the air release port is connected to the solid hydrogen storage and hydrogen supply module (1). A solid hydrogen storage bottle (9) is arranged between the intake port and the air release port of the pipeline hydrogen recovery device, and a heat exchange mechanism (10) is externally arranged on the solid hydrogen storage bottle.

[0023] In addition, in one embodiment, the intake port of the pipeline hydrogen recovery device is connected to the high-pressure pipeline of the booster system. The pneumatic valve (2-2) and the check valve (8-2) are connected to the intake port of the solid hydrogen storage bottle (9). The outlet of the solid hydrogen storage bottle (9) is connected to the pneumatic valve (2-3), the check valve (8-3), and the solid hydrogen storage and hydrogen supply module (1), and pressure sensors (5-2, 5-3) are arranged in the pipeline.

[0024] In addition, the present invention also provides a hydrogen recovery method for a distributed hydrogen refueling station pipeline hydrogen recovery device, which is characterized in that: the hydrogen recovery method includes the following steps:

[0025] S1: Lower the temperature of the solid hydrogen storage bottle through the heat exchange mechanism, open the pneumatic switch valve, and the solid hydrogen storage bottle starts to absorb hydrogen. When the pipeline hydrogen pressure is lower than the pressure allowed for the booster pump to start again, close the pneumatic switch valve;

[0026] S2: Increase the temperature of the solid hydrogen storage cylinder through the heat exchange mechanism. When the hydrogen pressure in the solid hydrogen storage cylinder rises above the pressure of the solid hydrogen storage and supply module, open the pneumatic switch valve to relieve the pressure of the hydrogen in the solid hydrogen storage cylinder to the solid hydrogen storage and supply module for storage;

[0027] S3: Repeat S1 and S2 in sequence to continuously recycle the hydrogen in the high-pressure pipeline at the outlet end of the booster pump;

[0028] Preferably, the pressure allowed for the booster pump to start again in S1 is less than 1 MPa, and the room-temperature hydrogen supply pressure of the solid hydrogen storage and supply module is greater than 3 MPa.

[0029] Preferably, the room-temperature hydrogen absorption pressure of the solid hydrogen storage cylinder described in S1 is less than 1 MPa.

[0030] In addition, in an embodiment, the hydrogen at 5 MPa (50 °C water bath) provided by the solid hydrogen storage and supply module (1) is pressurized to 35 MPa by the diaphragm booster pump (3) to fill the vehicle-mounted cylinder with hydrogen. After the filling is completed, the diaphragm booster pump (3) stops and starts the pressure relief and recovery mode: close the pneumatic valve (2-3), open the pneumatic valve (2-2), and the 35 MPa pipeline hydrogen is depressurized to the solid hydrogen storage cylinder (9). The temperature of the solid hydrogen storage cylinder (9) is reduced to 15 °C through the heat exchange mechanism (when the room temperature is 25 °C, the hydrogen absorption platform pressure of the solid hydrogen storage cylinder is 0.95 MPa). The pressure sensor (5-2) detects a pressure of 0.76 MPa, which is less than the pressure of 1 MPa allowed when the diaphragm booster pump (3) starts again, and the pneumatic valve (2-2) is closed. The temperature of the solid hydrogen storage cylinder (9) is increased to 65 °C through the heat exchange mechanism. The pressure sensor (5-2) detects a pressure of 4.5 MPa, and the pressure sensor (5-3) detects a pressure of 3 MPa. Open the pneumatic valve (2-3), and the hydrogen in the solid hydrogen storage cylinder (9) is discharged into the solid hydrogen storage and supply module (1), and then the pneumatic valve (2-3) is closed to complete the recovery of hydrogen.

[0031] In another embodiment, the 5MPa (50°C water bath) hydrogen provided by the solid-state hydrogen storage and hydrogen supply module (1) is pressurized to 70MPa by the diaphragm booster pump (3) to fill the vehicle-mounted bottle with hydrogen. After the filling is completed, the diaphragm booster pump (3) is shut down to start the pressure relief recovery mode: the pneumatic valve (2-3) is closed, the pneumatic valve (2-2) is opened, and the 70MPa pipeline hydrogen is depressurized to the solid-state hydrogen storage bottle (9). The temperature of the solid-state hydrogen storage bottle (9) is reduced to 0°C (the hydrogen absorption platform pressure of the solid-state hydrogen storage bottle is 0.95MPa at room temperature of 25°C) through the heat exchange mechanism. The pressure sensor (5-2) detects a pressure of 0.45MPa, which is less than the allowable pressure of 1MPa when the diaphragm booster pump (3) is started again, and the pneumatic valve (2-2) is closed. The temperature of the solid-state hydrogen storage bottle (9) is raised to 80° C. by a heat exchange mechanism, the pressure sensor (5-2) detects a pressure of 5.5 MPa, the pressure sensor (5-3) detects a pressure of 3 MPa, the pneumatic valve (2-3) is opened, the hydrogen in the solid-state hydrogen storage bottle (9) is discharged into the solid-state hydrogen storage and hydrogen supply module (1), and the pneumatic valve (2-3) is closed to complete the recovery of the hydrogen.

[0032] The above is only a specific implementation of the invention, but the protection scope of the invention is not limited to it. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the invention. Therefore, the protection scope of the invention should be based on the protection scope defined in the claims.

Claims

1. A distributed hydrogen pipeline recovery device for a hydrogen refueling station, comprising pneumatic valves (2-2, 2-3), check valves (8-2, 8-3), a solid-state hydrogen storage cylinder (9), and pressure sensors (5-2, 5-3). The inlet of the pipeline hydrogen recovery device is connected to the high-pressure pipeline of the pressurization system, and the exhaust port is connected to the solid-state hydrogen storage and hydrogen supply module (1). A solid-state hydrogen storage cylinder (9) is arranged between the inlet and the exhaust port of the pipeline hydrogen recovery device, and a heat exchange mechanism (10) is externally arranged on the solid-state hydrogen storage cylinder.

2. The hydrogen recovery device for the pipeline of a distributed hydrogen refueling station according to claim 1, wherein: The inlet of the pipeline hydrogen recovery device is connected to the high-pressure pipeline of the pressurization system, and the exhaust port is connected to the solid-state hydrogen storage and hydrogen supply module (1).

3. The hydrogen recovery device for the pipeline of a distributed hydrogen refueling station according to claim 1, wherein: A solid-state hydrogen storage cylinder (9) is arranged between the inlet and the exhaust port of the pipeline hydrogen recovery device. Pneumatic valves (2-2, 2-3), check valves (8-2, 8-3), and pressure sensors (5-2, 5-3) are respectively installed on the connecting pipelines between the solid-state hydrogen storage cylinder (9) and the inlet and the exhaust port.

4. A distributed hydrogen refueling station pipeline hydrogen recovery device according to claim 1 or 3, characterized in that: A heat exchange mechanism (10) is externally arranged on the solid-state hydrogen storage cylinder, and the solid-state hydrogen storage cylinder (9) is heated or cooled through the heat exchange mechanism (10).

5. The hydrogen recovery method of a distributed hydrogen refueling station pipeline hydrogen recovery device according to any one of claims 1-4, characterized in that: The hydrogen recovery method includes the following steps: S1: Lower the temperature of the solid-state hydrogen storage cylinder (9) through the heat exchange mechanism (10), open the pneumatic switch valve (2-2), and the solid-state hydrogen storage cylinder (9) starts to absorb hydrogen. When the pipeline hydrogen pressure (5-2) is lower than the pressure required for the booster pump to start again, close the pneumatic switch valve (2-2); S2: Raise the temperature of the solid-state hydrogen storage cylinder (9) through the heat exchange mechanism (10). When the hydrogen pressure (5-2) in the solid-state hydrogen storage cylinder (9) rises to exceed the pressure (5-3) of the solid-state hydrogen storage and hydrogen supply module (1), open the pneumatic switch valve (2-3), and relieve the pressure of the hydrogen in the solid-state hydrogen storage cylinder (9) to the solid-state hydrogen storage and hydrogen supply module (1) for storage; S3: Repeat S1 and S2 in sequence, and the high-pressure pipeline hydrogen at the outlet end during the start-stop process of the booster pump can be continuously recovered and utilized.

6. The hydrogen recovery method of a distributed hydrogen refueling station pipeline hydrogen recovery device according to claim 5, characterized in that: The pressure allowed for the booster pump to start again in S1 is less than 1 MPa, and the room-temperature hydrogen supply pressure of the solid-state hydrogen storage and hydrogen supply module (1) is greater than 3 MPa.

7. The hydrogen recovery method of a distributed hydrogen refueling station pipeline hydrogen recovery device according to claim 5, characterized in that: The room-temperature hydrogen absorption pressure of the solid-state hydrogen storage cylinder (9) is less than 1 MPa.

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