Hydrogen separation and recovery system

Abstract

The application discloses a hydrogen separation and recovery system, which comprises a connecting module, a storage tank module and a separation module.The connecting module is used for receiving mixed gas of hydrogen and pressure maintaining gas delivered by a vehicle-mounted hydrogen storage system and transmitting the received mixed gas to the storage tank module.The storage tank module is used for receiving the mixed gas transmitted by the connecting module and transmitting the mixed gas to the separation module.The separation module is used for separating hydrogen and pressure maintaining gas in the mixed gas and transmitting the separated hydrogen and pressure maintaining gas to a first compression module and a second compression module respectively.The first compression module is used for compressing the gas entering the first compression module and transmitting the compressed gas to a first finished product storage tank for storage.The second compression module is used for compressing the gas entering the second compression module and transmitting the compressed gas to a second finished product storage tank for storage.The hydrogen and pressure maintaining gas separated by the application can be reused, the waste of hydrogen and pressure maintaining gas is reduced, and the energy utilization rate is improved.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and in particular to a hydrogen separation and recovery system. Background Technology

[0002] The hydrogen storage devices equipped by fuel cell vehicle manufacturers mainly consist of high-pressure hydrogen storage cylinders, which are supplied by qualified manufacturers. These cylinders, along with pipelines, valves, and controls, form the hydrogen storage system. After the hydrogen storage system is transported to the vehicle manufacturer and integrated with other vehicle components, it needs to be pressurized for safety reasons. Nitrogen gas is typically used for pressurization. After passing a pressure-holding and airtightness test, the system is then transported to a hydrogen refueling station for replacement and refueling.

[0003] Because fuel cell stacks require high hydrogen purity for operation, multiple hydrogen refills are necessary to replace nitrogen. Generally, after hydrogen refilling and replacement, the hydrogen in the high-pressure hydrogen storage system is vented before the next replacement. As fuel cell applications expand and the demand for longer driving range increases, the quality of hydrogen storage is typically improved by increasing the number of cylinders or increasing the volume of individual cylinders. However, increasing the volume of the hydrogen storage cylinders increases hydrogen consumption during replacement operations. This not only increases the overall vehicle operating cost but also represents a waste of energy due to the venting of hydrogen. Summary of the Invention

[0004] This invention provides a hydrogen separation and recovery system that allows for the reuse of separated hydrogen and pressurized gas as needed, reducing waste of hydrogen and pressurized gas and improving energy efficiency.

[0005] According to one aspect of the present invention, a hydrogen separation and recovery system is provided, the hydrogen separation and recovery system comprising:

[0006] Connection module, storage tank module, separation module, first compression module, second compression module, first finished product storage tank and second finished product storage tank;

[0007] The connection module is connected to the first end of the storage tank module. The connection module is used to receive the mixture of hydrogen and pressure-holding gas delivered by the on-board hydrogen storage system and to transmit the received mixture to the storage tank module.

[0008] The second end of the storage tank module is connected to the first end of the separation module. The storage tank module is used to receive the mixed gas transmitted by the connection module and transmit the mixed gas to the separation module.

[0009] The second end of the separation module is connected to the first end of the first compression module, and the third end of the separation module is connected to the first end of the second compression module. The separation module is used to separate hydrogen and pressure-holding gas in the mixture and transmit the separated hydrogen and pressure-holding gas to the first compression module and the second compression module respectively.

[0010] The second end of the first compression module is connected to the first finished product storage tank. The first compression module is used to compress the gas entering the first compression module and transmit the compressed gas to the first finished product storage tank. The first finished product storage tank is used to store the gas transmitted by the first compression module.

[0011] The second end of the second compression module is connected to the second finished product storage tank. The second compression module is used to compress the gas entering the second compression module and transfer the compressed gas to the second finished product storage tank. The second finished product storage tank is used to store the gas transferred by the second compression module.

[0012] Furthermore, the connection module includes a first connection unit and a second connection unit; the storage tank module includes a first storage tank and a second storage tank; the separation module includes a first separation unit and a second separation unit; the first compression module includes a first compression unit and a second compression unit; and the second compression module includes a third compression unit and a fourth compression unit.

[0013] The first connecting unit is connected to the first end of the first storage tank. The first connecting unit receives a mixed gas with a displacement pressure less than or equal to a preset pressure and transmits the mixed gas with a displacement pressure less than or equal to the preset pressure to the first storage tank. The second end of the first storage tank is connected to the first end of the first separating unit. The first storage tank receives a mixed gas with a displacement pressure less than or equal to the preset pressure transmitted by the first connecting unit and transmits the mixed gas with a displacement pressure less than or equal to the preset pressure to the first separating unit. The second end of the first separating unit is connected to the first end of the first compression unit, and the third end of the first separating unit is connected to the first end of the third compression unit. The first separating unit is used to separate gases with displacement pressures less than or equal to the preset pressure. The mixture is prepared at a preset pressure, and the separated hydrogen and pressure-holding gas are respectively transferred to the first compression unit and the third compression unit. The second end of the first compression unit is connected to the first end of the first finished product storage tank, and the second end of the third compression unit is connected to the first end of the second finished product storage tank. The first compression unit is used to compress the gas entering the first compression unit and transfer the compressed gas to the first finished product storage tank. The first finished product storage tank is used to store the gas transferred by the first compression unit. The third compression unit is used to compress the gas entering the third compression unit and transfer the compressed gas to the second finished product storage tank. The second finished product storage tank is used to store the gas transferred by the third compression unit.

[0014] The second connecting unit is connected to the first end of the second storage tank. The second connecting unit receives the mixed gas with a displacement pressure greater than a preset pressure and transmits the mixed gas with a displacement pressure greater than the preset pressure to the second storage tank. The second end of the second storage tank is connected to the first end of the second separation unit. The second storage tank receives the mixed gas with a displacement pressure greater than the preset pressure transmitted by the second connecting unit and transmits the mixed gas with a displacement pressure greater than the preset pressure to the second separation unit. The second end of the second separation unit is connected to the first end of the second compression unit, and the third end of the second separation unit is connected to the first end of the fourth compression unit. The second separation unit separates the mixed gas with a displacement pressure greater than the preset pressure and separates the hydrogen and... The pressurized gas is respectively transmitted to the second compression unit and the fourth compression unit; the second end of the second compression unit is connected to the second end of the first finished product storage tank, and the second end of the fourth compression unit is connected to the second end of the second finished product storage tank. The second compression unit is used to compress the gas entering the second compression unit and transmit the compressed gas to the first finished product storage tank; the first finished product storage tank is used to store the gas transmitted by the second compression unit; the fourth compression unit is used to compress the gas entering the fourth compression unit and transmit the compressed gas to the second finished product storage tank; the second finished product storage tank is used to store the gas transmitted by the fourth compression unit; wherein, the displacement pressure is the pressure of the mixed gas stored in the on-board hydrogen storage system.

[0015] Furthermore, the first connection unit includes multiple first connection ends; the first connection ends are used to connect to an on-board hydrogen storage system containing a mixed gas with a replacement pressure less than or equal to a preset pressure.

[0016] The second connection unit includes multiple second connection terminals; the second connection terminals are used to connect to an on-board hydrogen storage system containing a mixed gas with a displacement pressure greater than a preset pressure.

[0017] Furthermore, the first separation unit is used to separate hydrogen and pressure-holding gas in the mixed gas using membrane separation.

[0018] The second separation unit is used to separate hydrogen and pressure-holding gas in the mixed gas using membrane separation.

[0019] Furthermore, the first separation unit includes a first separation device; the first separation device contains multiple layers of separation diaphragms;

[0020] The second separation unit includes a second separation device; the second separation device contains multiple separation diaphragms.

[0021] Furthermore, the first compression module also includes a first control device; the first control device is electrically connected to the first compression unit and the second compression unit, and the first control device is used to receive first pressure control information input by the operator and transmit the first pressure control information to the first compression unit and the second compression unit; the first compression unit is used to compress the separated gas according to the first pressure control information, and the second compression unit is used to compress the separated gas according to the first pressure control information.

[0022] The second compression module also includes a second control device; the second control device is electrically connected to the third compression unit and the fourth compression unit. The second control device is used to receive second pressure control information input by the operator and transmit the second pressure control information to the third and fourth compression units; the third compression unit is used to compress the separated gas according to the second pressure control information; the fourth compression unit is used to compress the separated gas according to the second pressure control information.

[0023] Furthermore, the hydrogen separation and recovery system includes:

[0024] A first high-pressure gas cylinder and a second high-pressure gas cylinder; the first high-pressure gas cylinder is used to receive gas released from the first finished product storage tank, and the second high-pressure gas cylinder is used to receive gas released from the second finished product storage tank;

[0025] The first high-pressure gas cylinder is connected to the first finished product storage tank;

[0026] The second high-pressure gas cylinder is connected to the second finished product storage tank.

[0027] Furthermore, the hydrogen separation and recovery system includes:

[0028] Pressure monitor, temperature monitor, multiple safety valves and multiple check valves;

[0029] Pressure monitors and temperature monitors are installed on the storage tank module, the first finished product storage tank, and the second finished product storage tank. The pressure monitor is used to monitor the pressure of the mixed gas in the storage tank module in real time, and the temperature monitor is used to monitor the temperature of the mixed gas in the storage tank module in real time.

[0030] Safety valves are installed on the storage tank module, separation module, first finished product storage tank and second finished product storage tank respectively. The safety valves are used to automatically discharge the mixed gas when the pressure value of the mixed gas in the storage tank module, separation module, first finished product storage tank or second finished product storage tank is greater than the preset value.

[0031] A one-way valve is installed between the connection module and the storage tank module, a one-way valve is installed between the storage tank module and the separation module, a one-way valve is installed between the second end of the separation module and the first compression module, a one-way valve is installed between the third end of the separation module and the second compression module, a one-way valve is installed between the first compression module and the first finished product storage tank, and a one-way valve is installed between the second compression module and the second finished product storage tank.

[0032] Furthermore, the displacement pressure range is 2MPa-6MPa.

[0033] Furthermore, the separation membrane is made of polymer.

[0034] The hydrogen separation and recovery system designed in this embodiment of the invention includes a connection module, a storage tank module, a separation module, a first compression module, a second compression module, a first finished product storage tank, and a second finished product storage tank. By connecting the connection module to the first end of the storage tank module, the second end of the storage tank module to the first end of the separation module, the second end of the separation module to the first end of the first compression module, the third end of the separation module to the first end of the second compression module, the second end of the first compression module to the first finished product storage tank, and the second end of the second compression module to the second finished product storage tank, the hydrogen transported by the on-board hydrogen storage system is successfully recovered. The mixture of hydrogen gas and pressurized gas is transferred to a storage tank module, and then from the storage tank module to a separation module. The separation module separates the hydrogen gas and pressurized gas in the mixture, and then transfers the separated hydrogen gas and pressurized gas to a first compression module and a second compression module for pressurization. Finally, the compressed gas is transferred to a first finished product storage tank and a second finished product storage tank for storage, so that the separated hydrogen gas and pressurized gas can be reused as needed. This reduces the direct emission of the mixture in the existing technology, thereby reducing the waste of hydrogen gas and pressurized gas and improving energy utilization.

[0035] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of a hydrogen separation and recovery system provided according to an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of another hydrogen separation and recovery system provided according to an embodiment of the present invention. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0041] This invention provides a hydrogen separation and recovery system. Figure 1 This is a schematic diagram of a hydrogen separation and recovery system according to an embodiment of the present invention. (Refer to...) Figure 1 The hydrogen separation and recovery system includes:

[0042] Connection module 1, storage tank module 2, separation module 3, first compression module 4, second compression module 5, first finished product storage tank 6, and second finished product storage tank 7;

[0043] The first end of the connection module 1 is connected to the first end of the storage tank module 2. The connection module 1 is used to receive the mixture of hydrogen and pressure-holding gas delivered by the on-board hydrogen storage system and to transmit the received mixture to the storage tank module 2.

[0044] The second end of the storage tank module 2 is connected to the first end of the separation module 3. The storage tank module 2 is used to receive the mixed gas transmitted by the connection module 1 and transmit the mixed gas to the separation module 3.

[0045] The second end of the separation module 3 is connected to the first end of the first compression module 4, and the third end of the separation module 3 is connected to the first end of the second compression module 5. The separation module 3 is used to separate hydrogen and pressure-holding gas in the mixture and transmit the separated hydrogen and pressure-holding gas to the first compression module 4 and the second compression module 5 respectively.

[0046] The second end of the first compression module 4 is connected to the first finished product storage tank 6. The first compression module 4 is used to compress the gas entering the first compression module 4 and transmit the compressed gas to the first finished product storage tank 6. The first finished product storage tank 6 is used to store the gas transmitted by the first compression module 4.

[0047] The second end of the second compression module 5 is connected to the second finished product storage tank 7. The second compression module 5 is used to compress the gas entering the second compression module 5 and transmit the compressed gas to the second finished product storage tank 7. The second finished product storage tank 7 is used to store the gas transmitted by the second compression module 5.

[0048] Specifically, after the hydrogen storage system is transported to the vehicle manufacturer and integrated with other vehicle components, it needs to be pressurized for safety reasons, which involves introducing a pressurizing gas into the system. Since the onboard fuel cell system requires high purity hydrogen during operation, it needs to be refilled with hydrogen multiple times to replace the pressurizing gas in the onboard hydrogen storage system. The pressurizing gas can be nitrogen. After the on-board hydrogen storage system is filled with hydrogen to dilute the pressurized gas, it can be connected to the hydrogen separation and recovery system designed in this embodiment of the invention. The connection module 1 receives the mixture of hydrogen and pressurized gas delivered by the on-board hydrogen storage system and transmits the received mixture to the storage tank module 2 for storage. For example, the storage tank module 2 can transmit the mixture to the separation module 3 after receiving multiple mixtures, or it can directly transmit the mixture to the separation module 3 after receiving the mixture from the connection module 1. The separation module 3 separates the incoming mixture into hydrogen and pressurized gas, and transmits the hydrogen and pressurized gas to the first compression module 4 and the second compression module 5 respectively. For example, the hydrogen can be transmitted to the first compression module 4 and the pressurized gas to the second compression module 5; or the pressurized gas can be transmitted to the first compression module 4 and the hydrogen to the second compression module 5. This embodiment of the invention does not limit this. The first compression module 4 compresses the gas entering the first compression module 4 and transmits the compressed gas to the first finished product storage tank 6 for storage. Similarly, the second compression module 5 compresses the gas entering the second compression module 5 and transmits the compressed gas to the second finished product storage tank 7 for storage. For example, the first compression module 4 and the second compression module 5 can compress the gas entering the first compression module 4 and the second compression module 5 as needed to separate the mixture of hydrogen and pressure-holding gas in the on-board hydrogen storage system, thereby enabling the recycling and reuse of hydrogen and pressure-holding gas.

[0049] The hydrogen separation and recovery system designed in this embodiment of the invention includes a connection module 1, a storage tank module 2, a separation module 3, a first compression module 4, a second compression module 5, a first finished product storage tank 6, and a second finished product storage tank 7. By connecting the connection module 1 to the first end of the storage tank module 2, the second end of the storage tank module 2 to the first end of the separation module 3, the second end of the separation module 3 to the first end of the first compression module 4, the third end of the separation module 3 to the first end of the second compression module 5, the second end of the first compression module 4 to the first finished product storage tank 6, and the second end of the second compression module 5 to the second finished product storage tank 7, on-board hydrogen storage is achieved. The system delivers a mixture of hydrogen and pressurized gas to storage tank module 2, which then transfers the mixture to separation module 3. Separation module 3 separates the hydrogen and pressurized gas from the mixture, and then transfers the separated hydrogen and pressurized gas to first compression module 4 and second compression module 5 for pressurization. Finally, the compressed gases are transferred to first finished product storage tank 6 and second finished product storage tank 7 for storage, so that the separated hydrogen and pressurized gas can be reused as needed. This reduces the direct emission of the mixture in existing technologies, thereby reducing the waste of hydrogen and pressurized gas and improving energy utilization.

[0050] Furthermore, Figure 2 This is a schematic diagram of another hydrogen separation and recovery system provided according to an embodiment of the present invention, with reference to... Figure 2 The connection module includes a first connection unit 11 and a second connection unit 12; the storage tank module includes a first storage tank 21 and a second storage tank 22; the separation module includes a first separation unit 31 and a second separation unit 32; the first compression module includes a first compression unit 41 and a second compression unit 42; the second compression module includes a third compression unit 51 and a fourth compression unit 52.

[0051] The first connecting unit 11 is connected to the first end of the first storage tank 21. The first connecting unit 11 is used to receive the mixed gas with a displacement pressure less than or equal to a preset pressure and to transmit the mixed gas with a displacement pressure less than or equal to the preset pressure to the first storage tank 21. The second end of the first storage tank 21 is connected to the first end of the first separating unit 31. The first storage tank 21 is used to receive the mixed gas with a displacement pressure less than or equal to the preset pressure transmitted by the first connecting unit 11 and to transmit the mixed gas with a displacement pressure less than or equal to the preset pressure to the first separating unit 31. The second end of the first separating unit 31 is connected to the first end of the first compression unit 41, and the third end of the first separating unit 31 is connected to the first end of the third compression unit 51. The first separating unit 31 is used to separate the mixed gas with a displacement pressure less than the preset pressure. The mixture is prepared at a pressure equal to or equal to a preset pressure, and the separated hydrogen and pressure-holding gas are respectively transferred to the first compression unit 41 and the third compression unit 51; the second end of the first compression unit 41 is connected to the first end of the first finished product storage tank 6, and the second end of the third compression unit 51 is connected to the first end of the second finished product storage tank 7. The first compression unit 41 is used to compress the gas entering the first compression unit 41 and transfer the compressed gas to the first finished product storage tank 6; the first finished product storage tank 6 is used to store the gas transferred by the first compression unit 41; the third compression unit 51 is used to compress the gas entering the third compression unit 51 and transfer the compressed gas to the second finished product storage tank 7; the second finished product storage tank 7 is used to store the gas transferred by the third compression unit 51.

[0052] The second connecting unit 12 is connected to the first end of the second storage tank 22. The second connecting unit 12 is used to receive the mixed gas with a displacement pressure greater than the preset pressure and to transmit the mixed gas with a displacement pressure greater than the preset pressure to the second storage tank 22. The second end of the second storage tank 22 is connected to the first end of the second separation unit 32. The second storage tank 22 is used to receive the mixed gas with a displacement pressure greater than the preset pressure transmitted by the second connecting unit 12 and to transmit the mixed gas with a displacement pressure greater than the preset pressure to the second separation unit 32. The second end of the second separation unit 32 is connected to the first end of the second compression unit 42, and the third end of the second separation unit 32 is connected to the first end of the fourth compression unit 52. The second separation unit 32 is used to separate the mixed gas with a displacement pressure greater than the preset pressure and to separate the hydrogen gas. The gas and the pressure-holding gas are respectively transmitted to the second compression unit 42 and the fourth compression unit 52; the second end of the second compression unit 42 is connected to the second end of the first finished product storage tank 6, and the second end of the fourth compression unit 52 is connected to the second end of the second finished product storage tank 7. The second compression unit 42 is used to compress the gas entering the second compression unit 42 and transmit the compressed gas to the first finished product storage tank 6; the first finished product storage tank 6 is used to store the gas transmitted by the second compression unit 42; the fourth compression unit 52 is used to compress the gas entering the fourth compression unit 52 and transmit the compressed gas to the second finished product storage tank 7; the second finished product storage tank 7 is used to store the gas transmitted by the fourth compression unit 52; wherein, the displacement pressure is the pressure of the mixed gas stored in the on-board hydrogen storage system.

[0053] Specifically, two connecting pipes for the on-board hydrogen storage system can be set up according to the displacement pressure within the on-board hydrogen storage system, namely, a first connecting unit 11 and a second connecting unit 12. For example, when the displacement pressure of the mixture in the on-board hydrogen storage system is less than or equal to a preset pressure, the on-board hydrogen storage system with a displacement pressure less than or equal to the preset pressure is connected to the corresponding first connecting unit 11; when the displacement pressure of the mixture in the on-board hydrogen storage system is greater than the preset pressure, the on-board hydrogen storage system with a displacement pressure greater than the preset pressure is connected to the corresponding second connecting unit 12. For example, the displacement pressure range is generally 1 MPa-10 MPa. Since the higher the displacement pressure, the longer the displacement operation time, preferably, the preset pressure can be set to 5 MPa. For example, the on-board hydrogen storage system with a displacement pressure less than or equal to 5 MPa is connected to the corresponding first connecting unit 11; and the on-board hydrogen storage system with a displacement pressure greater than 5 MPa is connected to the corresponding second connecting unit 12.

[0054] After receiving a mixed gas with a displacement pressure less than or equal to a preset pressure, the first connecting unit 11 transmits the mixed gas with a displacement pressure less than or equal to the preset pressure to the first storage tank 21 for storage. When needed, the mixed gas with a displacement pressure less than or equal to the preset pressure is transmitted to the first separation unit 31 for separation processing, separating the mixed gas into hydrogen and pressure-holding gas, and then transmitting them to the first compression unit 41 and the third compression unit 51 respectively. For example, hydrogen can be transmitted to the first compression unit 41 and pressure-holding gas can be transmitted to the third compression unit 51; alternatively, hydrogen can be transmitted to the third compression unit 51 and pressure-holding gas can be transmitted to the first compression unit 41. This embodiment of the invention does not limit this. The first compression unit 41 compresses the gas entering the first compression unit 41 and transmits the compressed gas to the first finished product storage tank 6 for storage. Similarly, the third compression unit 51 compresses the gas entering the third compression unit 51 and transmits the compressed gas to the second finished product storage tank 7 for storage. For example, the first compression unit 41 and the third compression unit 51 can compress the gas entering the first compression unit 41 and the third compression unit 51 as needed.

[0055] After receiving a mixed gas with a displacement pressure less than or equal to a preset pressure, the second connecting unit 12 transmits the mixed gas with a displacement pressure less than or equal to the preset pressure to the second storage tank 22 for storage. When needed, the mixed gas with a displacement pressure less than or equal to the preset pressure is transmitted to the second separation unit 32 for separation processing, separating the mixed gas into hydrogen and pressure-holding gas, and then transmitting them to the second compression unit 42 and the fourth compression unit 52 respectively. The gas transmitted to the second compression unit 42 is the same as the gas transmitted to the first compression unit 41, and the gas transmitted to the third compression unit 51 is the same as the gas transmitted to the fourth compression unit 52. The second compression unit 42 compresses the gas entering the second compression unit 42 and transmits the compressed gas to the first finished product storage tank 6 for storage. Similarly, the fourth compression unit 52 compresses the gas entering the fourth compression unit 52 and transmits the compressed gas to the second finished product storage tank 7 for storage. For example, the second compression unit 42 and the fourth compression unit 52 can compress the gas entering the second compression unit 42 and the fourth compression unit 52 as needed, realizing the separate processing of mixed gases at different pressures in the on-board hydrogen storage system. This not only enables the recovery and reuse of hydrogen and pressurized gas, but also improves the separation efficiency of hydrogen and pressurized gas.

[0056] Furthermore, the first connection unit includes multiple first connection ends; the first connection ends are used to connect to an on-board hydrogen storage system containing a mixed gas with a replacement pressure less than or equal to a preset pressure.

[0057] The second connection unit includes multiple second connection terminals; the second connection terminals are used to connect to an on-board hydrogen storage system containing a mixed gas with a displacement pressure greater than a preset pressure.

[0058] Specifically, the first connection unit is equipped with multiple first connection terminals, and the second connection unit is equipped with multiple second connection terminals, which can simultaneously receive mixed gas from multiple on-board hydrogen storage systems, thereby achieving simultaneous separation of mixed gas from multiple on-board hydrogen storage systems and further improving the separation efficiency of hydrogen and pressurized gas.

[0059] Furthermore, the first separation unit is used to separate hydrogen and pressurized gas in the mixed gas using membrane separation.

[0060] The second separation unit is used to separate hydrogen and pressure-holding gas in the mixed gas using membrane separation.

[0061] Specifically, membrane separation can achieve higher purity separation of hydrogen and pressurized gas. The membrane used in membrane separation can be a polymer membrane or a ceramic membrane.

[0062] Furthermore, the first separation unit includes a first separation device; the first separation device contains multiple layers of separation diaphragms;

[0063] The second separation unit includes a second separation device; the second separation device contains multiple separation diaphragms.

[0064] Specifically, multiple separation membranes are installed in the first separation device and the second separation device, which can further improve the purity of the separated hydrogen and pressurized gas.

[0065] Furthermore, the first compression module also includes a first control device; the first control device is electrically connected to the first compression unit and the second compression unit, and the first control device is used to receive first pressure control information input by the operator and transmit the first pressure control information to the first compression unit and the second compression unit; the first compression unit is used to compress the separated gas according to the first pressure control information, and the second compression unit is used to compress the separated gas according to the first pressure control information.

[0066] The second compression module also includes a second control device; the second control device is electrically connected to the third compression unit and the fourth compression unit. The second control device is used to receive second pressure control information input by the operator and transmit the second pressure control information to the third and fourth compression units; the third compression unit is used to compress the separated gas according to the second pressure control information; the fourth compression unit is used to compress the separated gas according to the second pressure control information.

[0067] Specifically, operators can input first pressure control information into the first control device according to actual needs, namely, the first pressure control value of the first compression module and the second pressure control value of the second compression module. After receiving the first pressure control information input by the operator, the first control device will transmit the first pressure control information to the first compression unit and the second compression unit. That is, the first control device transmits the first pressure control value to the first compression unit and the second pressure control value to the second compression unit. This enables the first compression unit to compress the gas entering the first compression unit according to the first pressure control value, and the second compression unit to compress the gas entering the second compression unit according to the second pressure control value. For example, the first pressure control value and the second pressure control value can be the same or different, and this embodiment of the invention does not impose any restrictions on this.

[0068] Similarly, operators can input second pressure control information into the second control device according to actual needs, namely the third pressure control value of the third compression module and the fourth pressure control value of the fourth compression module. After receiving the second pressure control information input by the operator, the second control device will transmit the second pressure control information to the third and fourth compression units. That is, the second control device will transmit the third pressure control value to the third compression unit and the fourth pressure control value to the fourth compression unit. This enables the third compression unit to compress the gas entering the third compression unit according to the third pressure control value, and the fourth compression unit to compress the gas entering the fourth compression unit according to the fourth pressure control value. For example, the third pressure control value and the fourth pressure control value can be the same or different, and this embodiment of the invention does not impose any restrictions on this.

[0069] Further reference Figure 2 The hydrogen separation and recovery system includes:

[0070] First high-pressure gas cylinder 81 and second high-pressure gas cylinder 82; the first high-pressure gas cylinder 81 is used to receive gas released from the first finished product storage tank 6, and the second high-pressure gas cylinder 82 is used to receive gas released from the second finished product storage tank 7.

[0071] The first high-pressure gas cylinder 81 is connected to the first finished product storage tank 6;

[0072] The second high-pressure gas cylinder 82 is connected to the second finished product storage tank 7.

[0073] Specifically, the gas received by the first high-pressure cylinder 81 can be hydrogen, and the gas received by the second high-pressure cylinder 82 can be a pressure-holding gas, or the gas received by the second high-pressure cylinder 82 can be hydrogen, and the gas received by the first high-pressure cylinder 81 can be a pressure-holding gas. The separated hydrogen can continue to be used as a source of replacement hydrogen, directly transported to the hydrogen refueling pipeline of the hydrogen refueling station for refueling the on-board hydrogen storage system, realizing the recycling of hydrogen. The separated pressure-holding gas can be used as a gas source in the laboratory or as a driving gas in the hydrogen refueling station, thereby achieving efficient utilization of the gas.

[0074] Further reference Figure 2 The hydrogen separation and recovery system includes:

[0075] Pressure monitor, temperature monitor, multiple safety valves and multiple check valves;

[0076] Pressure monitors and temperature monitors are installed on the storage tank module, the first finished product storage tank, and the second finished product storage tank. The pressure monitor is used to monitor the pressure of the mixed gas in the storage tank module in real time, and the temperature monitor is used to monitor the temperature of the mixed gas in the storage tank module in real time.

[0077] Safety valves are installed on the storage tank module, separation module, first finished product storage tank and second finished product storage tank respectively. The safety valves are used to automatically discharge the mixed gas when the pressure value of the mixed gas in the storage tank module, separation module, first finished product storage tank or second finished product storage tank is greater than the preset value.

[0078] A one-way valve is installed between the connection module and the storage tank module, a one-way valve is installed between the storage tank module and the separation module, a one-way valve is installed between the second end of the separation module and the first compression module, a one-way valve is installed between the third end of the separation module and the second compression module, a one-way valve is installed between the first compression module and the first finished product storage tank, and a one-way valve is installed between the second compression module and the second finished product storage tank.

[0079] For example, refer to Figure 2 Pressure monitor a and temperature monitor b are installed on the first storage tank 21, the second storage tank 22, the first finished product storage tank 6, and the second finished product storage tank 7. This allows on-site personnel to monitor the temperature and pressure in the first storage tank 21, the second storage tank 22, the first finished product storage tank 6, and the second finished product storage tank 7 in real time. If the temperature or pressure in the first storage tank 21 and the second storage tank 22 becomes abnormal, the first connecting unit 11 is promptly controlled to stop supplying mixed gas to the first storage tank 21, and the second connecting unit 12 is simultaneously controlled to stop supplying mixed gas to the second storage tank 22.

[0080] Safety valves c are installed on the first storage tank 21, the second storage tank 22, the first separation unit 31, the second separation unit 32, the first finished product storage tank 6, and the second finished product storage tank 7, respectively. When the pressure of one or more of the gases in the first storage tank 21, the second storage tank 22, the first separation unit 31, the second separation unit 32, the first finished product storage tank 6, and the second finished product storage tank 7 becomes too high, the internal gas pressure is released immediately to reduce the internal gas pressure and prevent damage to the components in the hydrogen separation and recovery system caused by excessive internal gas pressure.

[0081] One-way valves are installed between the first connecting unit 11 and the first storage tank 21, between the first storage tank 21 and the first separation unit 31, between the first separation unit 31 and the first compression unit 41, between the first separation unit 31 and the third compression unit 51, between the first compression unit 41 and the first finished product storage tank 6, between the third compression unit 51 and the second finished product storage tank 7, between the first finished product storage tank 6 and the first high-pressure gas cylinder 81, and between the third finished product storage tank 7 and the second high-pressure gas cylinder 82. These valves allow the gas to move in one direction, preventing backflow, and also enable timely shutdown of the delivery path in case of malfunction in the hydrogen separation and recovery system. To prevent damage to the hydrogen separation and recovery system, one-way valves are installed between the second connecting unit 12 and the second storage tank 22, between the second storage tank 22 and the second separation unit 32, between the second separation unit 32 and the second compression unit 42, between the second separation unit 32 and the fourth compression unit 52, between the second compression unit 42 and the first finished product storage tank 6, and between the fourth compression unit 52 and the second finished product storage tank 7. These valves are designed to ensure that the gas moves in one direction, preventing backflow, and to promptly shut off the delivery path in case of malfunction in the hydrogen separation and recovery system, thus preventing damage to the system.

[0082] The second compression unit 42; the second compression module includes a third compression unit 51 and a fourth compression unit 52.

[0083] Furthermore, the displacement pressure range is 2MPa-6MPa.

[0084] Furthermore, the separation membrane is made of polymer.

[0085] For example, if both vehicles have onboard hydrogen storage systems with a volume of 1680L and a combined gas pressure of 2MPa after refueling, then both onboard hydrogen storage systems are connected to the first connection unit. Simultaneously, the manual valves of both onboard hydrogen storage systems are opened, allowing both gas streams to enter the first storage tank. The first storage tank has a volume of 5 cubic meters. After both gas streams enter the first storage tank, the one-way valve at the outlet of the first storage tank is opened, allowing the combined gas to enter the first separation unit. The first separation unit has two outlets; the first outlet is used to extract hydrogen. After being pressurized by the first compression unit to 30MPa, the pressurized hydrogen enters the first finished product storage tank. The hydrogen in the first finished product storage tank is used to fill the first high-pressure gas cylinder, thus completing the purification and utilization of the hydrogen. The second outlet of the first separation unit is used to draw out the pressure-holding gas. After being pressurized by the third compression unit, the pressure of the pressure-holding gas is increased to 25MPa. The pressurized pressure-holding gas enters the second finished product storage tank. The pressure-holding gas in the second finished product storage tank is used to fill the second high-pressure gas cylinder, so that the pressure of the filled second high-pressure gas cylinder is 12MPa.

[0086] If both vehicles have a hydrogen storage system capacity of 1680L, with the first vehicle having a mixed gas pressure of 2MPa and the second vehicle having a mixed gas pressure of 6MPa, then these two on-board hydrogen storage systems are connected to the first connection unit and the second connection unit, respectively. The first vehicle is connected to the first storage tank via the first connection unit, and the second vehicle is connected to the second storage tank via the second connection unit. After connection, the manual valves of both on-board hydrogen storage systems are opened. At this point, the two mixed gas streams enter the first and second storage tanks respectively, and the separation and purification of the mixed gas begins. The mixed gas from the first storage tank enters the first separation unit via a one-way valve and pipeline. The mixed gas from the second storage tank enters the second separation unit via a one-way valve and pipeline. The first separation unit purifies the mixed gas, ultimately separating hydrogen and a pressurizing gas. Similarly, the second separation unit also purifies the mixed gas, ultimately separating hydrogen and a pressurizing gas. The hydrogen purified by the first separation unit is pressurized by the first compression unit and then enters the first finished product storage tank. The hydrogen purified by the second separation unit is pressurized by the second compression unit and then enters the first finished product storage tank. The working pressure of the hydrogen in the first finished product storage tank is 45 MPa. The hydrogen in the first finished product storage tank can be used as the source of replacement hydrogen and the working gas for hydrogen refueling at hydrogen refueling stations. Similarly, the pressurizing gas purified by the first separation unit is pressurized by the third compression unit and then enters the second finished product storage tank. The pressurizing gas purified by the second separation unit is pressurized by the fourth compression unit and then enters the second finished product storage tank. The working pressure of the pressurizing gas in the second finished product storage tank can be 20 MPa. The pressure-holding gas in the second finished product storage tank can be filled into the second high-pressure gas cylinder, and the pressure of the second high-pressure gas cylinder after filling can be 15 MPa.

[0087] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0088] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A hydrogen separation and recovery system, characterized in that, include: Connection module, storage tank module, separation module, first compression module, second compression module, first finished product storage tank and second finished product storage tank; The connection module is connected to the first end of the storage tank module. The connection module is used to receive the mixture of hydrogen and pressure-holding gas delivered by the on-board hydrogen storage system and to transmit the received mixture to the storage tank module. The second end of the storage tank module is connected to the first end of the separation module. The storage tank module is used to receive the mixed gas transmitted by the connection module and transmit the mixed gas to the separation module. The second end of the separation module is connected to the first end of the first compression module, and the third end of the separation module is connected to the first end of the second compression module. The separation module is used to separate hydrogen and pressure-holding gas in the mixture and transmit the separated hydrogen and pressure-holding gas to the first compression module and the second compression module, respectively. The second end of the first compression module is connected to the first finished product storage tank. The first compression module is used to compress the gas entering the first compression module and transmit the compressed gas to the first finished product storage tank. The first finished product storage tank is used to store the gas transmitted by the first compression module. The second end of the second compression module is connected to the second finished product storage tank. The second compression module is used to compress the gas entering the second compression module and transmit the compressed gas to the second finished product storage tank. The second finished product storage tank is used to store the gas transmitted by the second compression module.

2. The hydrogen separation and recovery system according to claim 1, characterized in that, The connection module includes a first connection unit and a second connection unit; the storage tank module includes a first storage tank and a second storage tank; the separation module includes a first separation unit and a second separation unit; the first compression module includes a first compression unit and a second compression unit; the second compression module includes a third compression unit and a fourth compression unit. The first connecting unit is connected to the first end of the first storage tank. The first connecting unit is used to receive a mixed gas with a displacement pressure less than or equal to a preset pressure and to transmit the mixed gas with a displacement pressure less than or equal to the preset pressure to the first storage tank. The second end of the first storage tank is connected to the first end of the first separating unit. The first storage tank is used to receive the mixed gas with a displacement pressure less than or equal to the preset pressure transmitted by the first connecting unit and to transmit the mixed gas with a displacement pressure less than or equal to the preset pressure to the first separating unit. The second end of the first separating unit is connected to the first end of the first compression unit, and the third end of the first separating unit is connected to the first end of the third compression unit. The first separating unit is used to separate the displacement pressure... A mixture of gases with a pressure less than or equal to the preset pressure is introduced, and the separated hydrogen and pressure-holding gas are respectively transmitted to the first compression unit and the third compression unit; the second end of the first compression unit is connected to the first end of the first finished product storage tank, and the second end of the third compression unit is connected to the first end of the second finished product storage tank. The first compression unit is used to compress the gas entering the first compression unit and transmit the compressed gas to the first finished product storage tank; the first finished product storage tank is used to store the gas transmitted by the first compression unit; the third compression unit is used to compress the gas entering the third compression unit and transmit the compressed gas to the second finished product storage tank; the second finished product storage tank is used to store the gas transmitted by the third compression unit. The second connecting unit is connected to the first end of the second storage tank. The second connecting unit receives the mixed gas with a displacement pressure greater than the preset pressure and transmits the mixed gas with the displacement pressure greater than the preset pressure to the second storage tank. The second end of the second storage tank is connected to the first end of the second separation unit. The second storage tank receives the mixed gas with a displacement pressure greater than the preset pressure transmitted by the second connecting unit and transmits the mixed gas with the displacement pressure greater than the preset pressure to the second separation unit. The second end of the second separation unit is connected to the first end of the second compression unit, and the third end of the second separation unit is connected to the first end of the fourth compression unit. The second separation unit separates the mixed gas with a displacement pressure greater than the preset pressure and separates the... The hydrogen and pressurized gas are then transferred to the second compression unit and the fourth compression unit, respectively. The second end of the second compression unit is connected to the second end of the first finished product storage tank, and the second end of the fourth compression unit is connected to the second end of the second finished product storage tank. The second compression unit compresses the gas entering the second compression unit and transfers the compressed gas to the first finished product storage tank. The first finished product storage tank stores the gas transferred by the second compression unit. The fourth compression unit compresses the gas entering the fourth compression unit and transfers the compressed gas to the second finished product storage tank. The second finished product storage tank stores the gas transferred by the fourth compression unit. The displacement pressure is the pressure of the mixed gas stored in the on-board hydrogen storage system.

3. The hydrogen separation and recovery system according to claim 2, characterized in that, The first connection unit includes a plurality of first connection terminals; the first connection terminals are used to connect to the on-board hydrogen storage system containing a mixed gas whose displacement pressure is less than or equal to the preset pressure; The second connection unit includes a plurality of second connection terminals; the second connection terminals are used to connect to the on-board hydrogen storage system containing a mixed gas with a displacement pressure greater than the preset pressure.

4. The hydrogen separation and recovery system according to claim 2, characterized in that, The first separation unit is used to separate hydrogen and pressure-holding gas in the mixed gas using membrane separation. The second separation unit is used to separate hydrogen and pressure-holding gas in the mixed gas using membrane separation.

5. The hydrogen separation and recovery system according to claim 4, characterized in that, The first separation unit includes a first separation device; the first separation device contains multiple layers of separation diaphragms; The second separation unit includes a second separation device; the second separation device contains multiple separation diaphragms.

6. The hydrogen separation and recovery system according to claim 2, characterized in that, The first compression module further includes a first control device; the first control device is electrically connected to the first compression unit and the second compression unit, and the first control device is used to receive first pressure control information input by the operator and transmit the first pressure control information to the first compression unit and the second compression unit; The first compression unit is used to compress the separated gas according to the first pressure control information, and the second compression unit is used to compress the separated gas according to the first pressure control information. The second compression module further includes a second control device; the second control device is electrically connected to the third compression unit and the fourth compression unit, and the second control device is used to receive second pressure control information input by the operator and transmit the second pressure control information to the third compression unit and the fourth compression unit; The third compression unit is used to compress the separated gas according to the second pressure control information; The fourth compression unit is used to compress the separated gas according to the second pressure control information.

7. The hydrogen separation and recovery system according to claim 1, characterized in that, include: A first high-pressure gas cylinder and a second high-pressure gas cylinder; the first high-pressure gas cylinder is used to receive gas released from the first finished product storage tank, and the second high-pressure gas cylinder is used to receive gas released from the second finished product storage tank; The first high-pressure gas cylinder is connected to the first finished product storage tank; The second high-pressure gas cylinder is connected to the second finished product storage tank.

8. The hydrogen separation and recovery system according to claim 1, characterized in that, include: Pressure monitor, temperature monitor, multiple safety valves and multiple check valves; The pressure monitor and the temperature monitor are installed on the storage tank module, the first finished product storage tank, and the second finished product storage tank. The pressure monitor is used to monitor the pressure of the mixed gas in the storage tank module in real time, and the temperature monitor is used to monitor the temperature of the mixed gas in the storage tank module in real time. The safety valve is installed on the storage tank module, the separation module, the first finished product storage tank, and the second finished product storage tank respectively. The safety valve is used to automatically discharge the mixed gas when the pressure value of the mixed gas in the storage tank module, the separation module, the first finished product storage tank, or the second finished product storage tank is greater than a preset value. A one-way valve is provided between the connection module and the storage tank module, a one-way valve is provided between the storage tank module and the separation module, a one-way valve is provided between the second end of the separation module and the first compression module, a one-way valve is provided between the third end of the separation module and the second compression module, a one-way valve is provided between the first compression module and the first finished product storage tank, and a one-way valve is provided between the second compression module and the second finished product storage tank.

9. The hydrogen separation and recovery system according to claim 2, characterized in that, The displacement pressure range is 2MPa-6MPa.

10. The hydrogen separation and recovery system according to claim 5, characterized in that, The separation membrane is made of polymer.

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