A power generation device with hydrogen separation and purification function and a hydrogen purification method

Abstract

The application discloses a power generation device with hydrogen separation and purification function and a hydrogen purification method, relates to the technical field of hydrogen purification, and comprises a generator, a hydrogen recovery unit, a membrane separation and purification unit and a measurement and control unit; the measurement and control unit is electrically connected with each control valve, automatically controls the on-off of the valve according to the hydrogen purity detected on-line, puts the membrane separation and purification unit into operation when the purity is lower than a first preset threshold value, makes the membrane separation and purification unit and the hydrogen recovery unit operate in series for deep purification, and removes the membrane separation and purification unit when the purity is higher than a second preset threshold value, so that the hydrogen recovery unit independently operates only. The application realizes full-automatic on-line operation of hydrogen purification, avoids hydrogen waste and manual operation hidden dangers, and through a switchable double-mode architecture and a purity direct control strategy, both gas production quality and membrane component service life are considered.

Description

Technical Field

[0001] This invention relates to the field of hydrogen purification technology, and more specifically to a power generation device and a hydrogen purification method with hydrogen separation and purification functions. Background Technology

[0002] Hydrogen-cooled generators utilize the low density and high heat transfer properties of hydrogen as a cooling medium, significantly reducing ventilation losses and improving heat exchange efficiency. The hydrogen purity inside water-hydrogen-cooled and all-hydrogen-cooled generators should reach above 96%, with an optimal level of above 98% recommended for improved efficiency. Currently, large-scale hydrogen-cooled generator sets in operation in China generally suffer from low hydrogen purity, typically maintained at around 97%. As hydrogen purity decreases, the density of the mixed gas increases, leading to a significant increase in generator aerodynamic losses. For every 1% decrease in hydrogen purity, ventilation losses increase by approximately 11%, corresponding to a reduction in output power of approximately 240 kW. To maintain hydrogen purity, power plants commonly employ a method of periodically venting a portion of low-purity hydrogen and replenishing it with high-purity hydrogen. Some units have a hydrogen replenishment frequency as high as once every 8 hours, with monthly hydrogen consumption exceeding 900 cubic meters.

[0003] Currently, this traditional method of hydrogen exhaust and replenishment has significant shortcomings. First, frequent manual operation increases the workload of operators and raises safety hazards such as hydrogen leaks and explosions. Second, the main component of the emitted mixed gas is still hydrogen, resulting in a large waste of hydrogen and poor economic efficiency. Third, the hydrogen exhaust and replenishment method can only adjust the purity intermittently, and cannot achieve continuous and stable online purification. The purity of hydrogen inside the machine fluctuates at a low level, and the generator operates in an inefficient state for a long time. In addition, although some existing hydrogen purification devices can achieve online operation, the membrane separation units mostly adopt a fixed series architecture, and the mode switching is based on indirect indicators such as recovery rate. It cannot directly respond to changes in the actual purity of the produced hydrogen, making it difficult to ensure the quality of the produced gas while simultaneously ensuring the balanced utilization and long-term operation of the membrane modules.

[0004] Therefore, it is necessary to propose a power generation device with hydrogen separation and purification function and a hydrogen purification method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of frequent operation, significant safety hazards, and serious hydrogen waste in traditional hydrogen exhaust and replenishment methods.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0007] A power generation device with hydrogen separation and purification function includes a generator, a hydrogen recovery unit, a membrane separation and purification unit and a measurement and control unit.

[0008] The hydrogen recovery unit includes an oil separator A, an oil separator B, and a hydrogen dryer. The hydrogen dryer is located between the oil separator A and the oil separator B. The gas intake port of the oil separator A is connected to the high-pressure area of ​​the generator, and the exhaust port of the oil separator B is connected to the low-pressure area of ​​the generator. The hydrogen flow is driven by the pressure difference between the high-pressure area and the low-pressure area of ​​the generator.

[0009] The membrane separation and purification unit includes a hydrogen purification device, a pre-purification pipeline, a post-purification pipeline, an exhaust gas pipeline, a W2 replacement sewage pipeline, a W4 replacement sewage pipeline, a W5 replacement sewage pipeline, an instrument compressed air pipeline, and a CO2 replacement gas pipeline.

[0010] The measurement and control unit is electrically connected to the hydrogen recovery unit and the membrane separation and purification unit, and is used to automatically control the valve opening and closing according to the hydrogen purity detected online, so as to switch between the first mode in which the hydrogen recovery unit operates independently, or the second mode in which the hydrogen recovery unit and the membrane separation and purification unit operate in series.

[0011] Furthermore, the inlet end of the pre-purification pipeline is connected to the outlet end of the hydrogen dryer, and the outlet end of the pre-purification pipeline is connected to the inlet of the hydrogen purification device.

[0012] The inlet of the purified pipeline is connected to the high-purity hydrogen outlet of the hydrogen purification device, and the outlet of the purified pipeline is used to output high-purity hydrogen.

[0013] The exhaust gas pipeline is connected to the exhaust gas outlet of the hydrogen purification device and is used to discharge the exhaust gas generated during the membrane separation process. A W10 control valve is installed on the exhaust gas pipeline.

[0014] The W2 replacement drain pipe is connected to the pre-purification pipe and is located between the outlet of the hydrogen dryer and the inlet of the hydrogen purification device. The W2 replacement drain pipe is equipped with a W2 replacement drain valve.

[0015] The W4 replacement sewage pipeline is connected to the hydrogen purification device for system venting, and the W4 replacement sewage pipeline is equipped with a W4 replacement sewage valve.

[0016] The W5 replacement sewage pipeline is connected to the purified pipeline and is located downstream of the Φ22 pipeline. The W5 replacement sewage pipeline is equipped with a W5 replacement sewage valve.

[0017] The instrument compressed air pipeline is connected to the hydrogen purification device and is used to supply instrument compressed air to the hydrogen purification device. The instrument compressed air pipeline is equipped with a W6 control valve.

[0018] The CO2 replacement gas pipeline is connected to the hydrogen purification device and is used to provide CO2 replacement gas to the hydrogen purification device. The CO2 replacement gas pipeline is equipped with a W7 control valve.

[0019] Furthermore, the membrane separation and purification unit also includes a W1 replacement sewage pipe and a W3 replacement sewage pipe;

[0020] The W1 replacement sewage pipeline is connected to the pre-purification pipeline and is located between the W2 replacement sewage pipeline and the inlet of the hydrogen purification device. The W1 replacement sewage pipeline is equipped with a W1 control valve.

[0021] The W3 replacement sewage pipeline is connected to the purified pipeline and is located downstream of the high-purity hydrogen outlet of the hydrogen purification device. The W3 replacement sewage pipeline is equipped with a W3 control valve.

[0022] The membrane separation and purification unit also includes a W8 displacement and sewage discharge pipeline, which is connected to the hydrogen purification device and is used for displacement and sewage discharge. A W8 control valve is provided on the W8 displacement and sewage discharge pipeline.

[0023] Furthermore, the membrane separation and purification unit also includes a closed cooling water pipeline and a Φ22 pipeline;

[0024] The closed cooling water pipeline is connected to the hydrogen purification device and is used to cool the hydrogen purification device. The closed cooling water pipeline is equipped with a W9 control valve.

[0025] The Φ22 pipeline is connected to the purified pipeline.

[0026] Furthermore, the hydrogen purification device is a membrane separation type hydrogen purification device. The hydrogen gas input from the pre-purification pipeline is separated by the membrane, and high-purity hydrogen gas is output and sent out through the purified pipeline. At the same time, the separated waste gas is discharged through the exhaust gas pipeline.

[0027] Furthermore, the measurement and control unit includes an online purity detection module and a control module;

[0028] The online purity detection module is used to detect the purity of hydrogen in real time;

[0029] The control module is used to control the membrane separation and purification unit to start operation when the purity is lower than the first preset threshold, so that the hydrogen recovery unit and the membrane separation and purification unit operate in series; when the purity is higher than the second preset threshold, the membrane separation and purification unit is shut down, and only the hydrogen recovery unit operates independently.

[0030] Furthermore, when the control module controls the membrane separation and purification unit to start operation, it opens control valves W2 and W3 to connect the pre-purification pipeline and the post-purification pipeline to the hydrogen purification device.

[0031] When the control module controls the membrane separation and purification unit to be cut off, it closes control valves W2 and W3 to isolate the hydrogen purification device from the hydrogen recovery unit.

[0032] A method for purifying hydrogen includes the following steps:

[0033] S1. Extract impurity-containing hydrogen gas from the high-pressure area of ​​the generator, and use the pressure difference between the high-pressure area and the low-pressure area of ​​the generator to drive the hydrogen gas flow. The hydrogen gas flows through oil separator A, hydrogen dryer and oil separator B in sequence to remove oil and dry the gas, and obtain pretreated hydrogen gas.

[0034] S2. Detect hydrogen purity online via the measurement and control unit. ,when When the membrane separation and purification unit is turned on, the pretreated hydrogen gas enters the hydrogen purification device through the pre-purification pipeline for membrane separation and purification to obtain high-purity hydrogen gas.

[0035] S3. High-purity hydrogen is purified and output through a pipeline, while the waste gas generated during the membrane separation process is discharged through the exhaust pipeline.

[0036] S4. When the monitoring and control unit detects... When the membrane separation and purification unit is shut down, only the hydrogen recovery unit operates independently in a cycle.

[0037] Furthermore, in step S2, when the membrane separation and purification unit is started, control valves W2 and W3 are opened to connect the pre-purification pipeline and the post-purification pipeline to the hydrogen purification device.

[0038] In step S4, when shutting down the membrane separation and purification unit, control valves W2 and W3 are closed to isolate the hydrogen purification device from the hydrogen recovery unit.

[0039] Furthermore, before or after the membrane separation and purification unit is put into operation, CO2 replacement gas is introduced into the hydrogen purification device through the CO2 replacement gas pipeline and the W7 control valve, and the system is emptied and replaced through the W4 replacement sewage pipeline.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] 1. This invention sets up a measurement and control unit that is electrically connected to the hydrogen recovery unit and the membrane separation and purification unit. Based on the online detection of hydrogen purity, it automatically controls the opening and closing of valves to achieve automatic switching of operating modes. The entire process of hydrogen recovery, purification and recycling can be completed without manual intervention. This fundamentally eliminates the workload caused by frequent manual operation and the safety hazards such as hydrogen leakage and explosion, and significantly improves the safety and automation level of the power generation unit.

[0042] 2. This invention utilizes the pressure difference between the high-pressure and low-pressure zones of the generator to drive the hydrogen to circulate in a closed-loop circuit. The hydrogen recovery unit continuously removes oil and dries the hydrogen inside the generator, avoiding the waste of a large amount of hydrogen caused by the direct discharge of hydrogen-containing mixed gas in traditional hydrogen discharge and replenishment methods, and effectively reducing operating costs. At the same time, the membrane separation and purification unit adopts an on-demand operation mode, only operating online when the purity is insufficient, realizing continuous and stable hydrogen purification.

[0043] 3. This invention breaks through the limitations of the existing fixed series connection architecture of membrane separation units and constructs a switchable dual-mode operation system. It uses the online detection of hydrogen purity as a direct control basis to replace indirect indicators. When the purity is lower than the first preset threshold, the membrane separation purification unit is automatically activated for series purification. When the purity recovers to above the second preset threshold, it is automatically deactivated. This not only ensures the high quality of the produced hydrogen, but also reduces the unnecessary working time and frequent start-stop of the membrane module through on-demand operation and threshold difference design, effectively extending the service life of the membrane separation module. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the installation of the present invention. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] Please see Figure 1 A power generation device with hydrogen separation and purification function includes a generator, a hydrogen recovery unit, a membrane separation and purification unit, and a measurement and control unit. The generator used in this embodiment is a QFSN660MW-2 type hydrogen-cooled generator with a rated hydrogen pressure of 0.5MPa and an internal hydrogen filling volume of 110 cubic meters.

[0047] The generator has a high-pressure zone and a low-pressure zone inside. A pressure difference naturally forms between the high-pressure zone and the low-pressure zone during operation. In this embodiment, the pressure difference is used as the driving force for the hydrogen circulation flow, without the need for additional circulation fans or compression equipment.

[0048] The hydrogen recovery unit is connected between the high-pressure and low-pressure areas of the generator. It is used to extract impurity-containing hydrogen from the generator, remove oil and dry it, and then return the treated hydrogen to the generator to form a basic circulation loop.

[0049] The membrane separation and purification unit is connected to the process path of the hydrogen recovery unit and is used to perform membrane separation and purification on some or all of the recovered hydrogen to obtain hydrogen with higher purity.

[0050] The measurement and control unit is electrically connected to each control valve in the hydrogen recovery unit and the membrane separation and purification unit. It is used to detect the hydrogen purity online and automatically control the valve opening and closing according to the purity change, so as to realize the switching of the operation mode.

[0051] The hydrogen recovery unit includes an oil separator A, an oil separator B, and a hydrogen dryer. The hydrogen dryer is located between oil separator A and oil separator B, and the three are connected in series via pipelines.

[0052] The air intake port of oil separator A is connected to the high-pressure area of ​​the generator via a pipeline. This section of the air intake pipeline can use a Φ45 pipeline to ensure sufficient air intake flow. The exhaust port of oil separator B is connected to the low-pressure area of ​​the generator via a pipeline. This section of the return air pipeline can use a Φ60 pipeline.

[0053] During operation, the impurity-laden hydrogen gas in the high-pressure zone of the generator, driven by the pressure difference, first enters the oil separator A for preliminary oil removal, removing most of the oil mist carried in the hydrogen gas; then it enters the hydrogen dryer for drying treatment, removing the moisture in the hydrogen gas; finally, it undergoes secondary oil removal through the oil separator B to further remove the residual trace amounts of oil mist. After oil removal and drying treatment, the hydrogen gas returns to the low-pressure zone of the generator through the return gas pipeline, completing one basic cycle.

[0054] The hydrogen recovery unit can operate independently, forming the first operating mode. In this mode, the membrane separation and purification unit is isolated by valves and does not participate in hydrogen treatment.

[0055] The membrane separation and purification unit includes a hydrogen purification device, pre-purification pipeline, post-purification pipeline, Φ22 pipeline, exhaust gas pipeline, W1 replacement sewage pipeline, W2 replacement sewage pipeline, W3 replacement sewage pipeline, W4 replacement sewage pipeline, W5 replacement sewage pipeline, instrument compressed air pipeline, CO2 replacement gas pipeline, and closed cooling water pipeline.

[0056] The hydrogen purification device is a membrane separation type hydrogen purification device. It is equipped with a polymer membrane separation component inside, which uses the difference in the permeation rate of different gas molecules in the membrane material to separate hydrogen from impurity gases. The hydrogen purification device has an air inlet, a high-purity hydrogen outlet, an exhaust gas outlet, multiple replacement and sewage outlets, an instrument compressed air interface, a CO2 replacement gas interface, and a cooling water interface.

[0057] The inlet of the pre-purification pipeline is connected to the outlet of the hydrogen dryer, and the outlet is connected to the inlet of the hydrogen purification device. The pre-purification pipeline is used to introduce the pre-treated hydrogen from the hydrogen recovery unit into the hydrogen purification device for membrane separation and purification. The diameter of the pre-purification pipeline is DN40 to ensure sufficient hydrogen flow.

[0058] The inlet of the purified pipeline is connected to the high-purity hydrogen outlet of the hydrogen purification device, and the outlet is used to output high-purity hydrogen. The high-purity hydrogen obtained after membrane separation and purification is sent to the gas consumption point or storage unit through the purified pipeline. The diameter of the purified pipeline is DN40.

[0059] The Φ22 pipeline is connected to the purified pipeline for branch output or sampling and testing of high-purity hydrogen.

[0060] The exhaust gas pipeline is connected to the exhaust gas outlet of the hydrogen purification device and is used to discharge impurity gases that cannot permeate the membrane during the membrane separation process. The exhaust gas pipeline is equipped with a W10 control valve and has a diameter of DN15.

[0061] The W1 and W2 replacement drain lines are connected to the pre-purification pipelines. The W2 replacement drain line is located between the outlet of the hydrogen dryer and the inlet of the hydrogen purification device; the W1 replacement drain line is located between the W2 replacement drain line and the inlet of the hydrogen purification device. The W1 replacement drain line is equipped with a W1 control valve, and the W2 replacement drain line is equipped with a W2 control valve. Both pipelines have a diameter of DN15.

[0062] The W3 and W5 replacement drain lines are connected to the purified pipeline. The W3 replacement drain line is located downstream of the high-purity hydrogen outlet of the hydrogen purification unit. The W5 replacement drain line is connected to the purified pipeline and is located downstream of the W3 replacement drain line. The W3 replacement drain line is equipped with a W3 control valve, and the W5 replacement drain line is equipped with a W5 control valve. Both pipelines have a diameter of DN15.

[0063] The W4 replacement drain line is connected to the hydrogen purification device and is used for overall system purging and replacement. The W4 replacement drain line is equipped with a W4 control valve and has a diameter of DN15.

[0064] The W8 replacement sewage pipeline is connected to the hydrogen purification device and is used for replacement sewage discharge. The W8 replacement sewage pipeline is equipped with a W8 control valve and has a diameter of DN15.

[0065] The above six replacement and drainage pipelines, W1 to W5 and W8, are located at different positions in the pipelines before and after purification. They are used for replacement and drainage operations in each pipeline section and inside the hydrogen purification device. Among them, W2 and W3 are the main replacement and drainage ports, W1 and W5 are the auxiliary replacement and drainage ports, and W4 is the system's main vent.

[0066] The instrument compressed air pipeline is connected to the instrument compressed air interface of the hydrogen purification device to provide compressed air to the instruments and control system of the hydrogen purification device. The instrument compressed air pipeline is equipped with a W6 control valve and has a diameter of DN15.

[0067] The CO2 replacement gas pipeline is connected to the CO2 replacement gas interface of the hydrogen purification device. It is used to introduce CO2 gas into the hydrogen purification device during system start-up, shutdown, or maintenance to replace the internal components of the system and prevent hydrogen from mixing with air to form an explosive gas. The CO2 replacement gas pipeline is equipped with a W7 control valve and has a diameter of DN15.

[0068] The closed cooling water pipeline is connected to the cooling water interface of the hydrogen purification device to cool the hydrogen purification device and ensure that the membrane separation component operates within a suitable temperature range. The closed cooling water pipeline is equipped with a W9 control valve and has a diameter of DN15.

[0069] The measurement and control unit includes an online purity detection module and a control module. The online purity detection module is installed inside the generator or at an appropriate location in the hydrogen circulation pipeline. It is used to detect the hydrogen purity in real time and output a purity signal. The online purity detection module can use a thermal conductivity hydrogen purity detector or other hydrogen purity sensors suitable for online detection.

[0070] The control module receives the purity signal output from the online purity detection module and is electrically connected to each control valve in the hydrogen recovery unit and the membrane separation purification unit. The control module has a preset first threshold value. Second preset threshold First preset threshold The minimum purity required for the membrane separation and purification unit to operate is set at 99.0%; the second preset threshold... The upper limit of purity that can be removed by the membrane separation purification unit is set to 99.5%, and a first preset threshold is set. Second preset threshold The difference between these values ​​can prevent the membrane separation and purification unit from frequently starting and stopping near the critical purity level.

[0071] The control logic of the control module is as follows: when The system automatically outputs control signals to open control valves W2 and W3, enabling the membrane separation and purification unit to operate in series with the hydrogen recovery unit for further hydrogen purification; when The system automatically outputs control signals to close control valves W2 and W3, isolating the membrane separation and purification unit from the hydrogen recovery unit, allowing only the hydrogen recovery unit to operate independently in a cycle.

[0072] The hydrogen purification method in this embodiment includes the following steps:

[0073] S1. During generator operation, a pressure difference is formed between the high-pressure zone and the low-pressure zone. Driven by this pressure difference, hydrogen containing impurities is drawn out from the high-pressure zone of the generator through the gas intake pipeline, flows sequentially through the oil separator A for preliminary oil removal, the hydrogen dryer for drying, and the oil separator B for secondary oil removal. Then, it returns to the low-pressure zone of the generator through the return gas pipeline to complete the basic cycle. This stage is the first operating mode. The membrane separation and purification unit is in an isolated state, and control valves W2 and W3 are closed.

[0074] S2. The online purity detection module of the measurement and control unit monitors the hydrogen purity inside the generator in real time and transmits the purity signal to the control module. The control module then processes the detected real-time purity value. With the first preset threshold Second preset threshold Compare and judge.

[0075] S3, when The control module determines that further purification of hydrogen is required and automatically outputs a control signal to open control valves W2 and W3. At this time, part of the pre-treated hydrogen from the hydrogen dryer continues to return to the low-pressure area of ​​the generator via oil separator B to maintain basic circulation; the other part enters the hydrogen purification device for membrane separation purification through the pre-purification pipeline and control valve W2. The high-purity hydrogen obtained after membrane separation is output through the post-purification pipeline and control valve W3. The separated waste gas is discharged through the exhaust pipeline and control valve W10. At this time, the device operates in the second mode, that is, the hydrogen recovery unit and the membrane separation purification unit operate in series.

[0076] S4, when Once the control module determines that the hydrogen purity meets the operating requirements, it automatically outputs a control signal to close control valves W2 and W3, thus isolating the membrane separation and purification unit from the hydrogen recovery unit. The device then returns to the first operating mode, where only the hydrogen recovery unit operates independently in a cycle.

[0077] S5. Before or after the membrane separation and purification unit is put into operation, the system needs to be purged to ensure safety. During the purging operation, first close the W2 and W3 control valves, open the W7 control valve, and introduce CO2 gas into the hydrogen purification device and connected pipelines through the CO2 purging gas pipeline. At the same time, open the W4 control valve and discharge the residual hydrogen or mixed gas in the system through the W4 purging and drain pipeline until the gas in the system reaches a safe state.

[0078] S6. During the operation of the hydrogen purification unit, open the W6 control valve to supply compressed air to the instruments and control system of the hydrogen purification unit through the instrument compressed air pipeline to ensure the normal operation of the instruments. Open the W9 control valve to supply cooling water to the hydrogen purification unit through the closed cooling water pipeline to ensure that the membrane separation component operates within a suitable temperature range.

[0079] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the content of the present invention's specification shall also be included within the scope of protection of the present invention.

Claims

1. A power generation device with hydrogen separation and purification function, comprising a generator, characterized in that, It also includes a hydrogen recovery unit, a membrane separation and purification unit, and a measurement and control unit; The hydrogen recovery unit includes an oil separator A, an oil separator B, and a hydrogen dryer. The hydrogen dryer is located between the oil separator A and the oil separator B. The gas intake port of the oil separator A is connected to the high-pressure area of ​​the generator, and the exhaust port of the oil separator B is connected to the low-pressure area of ​​the generator. The hydrogen flow is driven by the pressure difference between the high-pressure area and the low-pressure area of ​​the generator. The membrane separation and purification unit includes a hydrogen purification device, a pre-purification pipeline, a post-purification pipeline, an exhaust gas pipeline, a W2 replacement sewage pipeline, a W4 replacement sewage pipeline, a W5 replacement sewage pipeline, a W8 replacement sewage pipeline, an instrument compressed air pipeline, and a CO2 replacement gas pipeline. The measurement and control unit is electrically connected to the hydrogen recovery unit and the membrane separation and purification unit, and is used to automatically control the valve opening and closing according to the online detection of hydrogen purity, so as to switch between the first mode of independent operation of the hydrogen recovery unit and the second mode of series operation of the hydrogen recovery unit and the membrane separation and purification unit.

2. A power generation device with hydrogen separation and purification function according to claim 1, characterized in that: The inlet of the pre-purification pipeline is connected to the outlet of the hydrogen dryer, and the outlet of the pre-purification pipeline is connected to the inlet of the hydrogen purification device. The inlet of the purified pipeline is connected to the high-purity hydrogen outlet of the hydrogen purification device, and the outlet of the purified pipeline is used to output high-purity hydrogen. The exhaust gas pipeline is connected to the exhaust gas outlet of the hydrogen purification device and is used to discharge the exhaust gas generated during the membrane separation process. A W10 control valve is installed on the exhaust gas pipeline. The W2 replacement drain pipe is connected to the pre-purification pipe and is located between the outlet of the hydrogen dryer and the inlet of the hydrogen purification device. The W2 replacement drain pipe is equipped with a W2 replacement drain valve. The W4 replacement sewage pipeline is connected to the hydrogen purification device for system venting, and the W4 replacement sewage pipeline is equipped with a W4 replacement sewage valve. The W5 replacement sewage pipeline is connected to the purified pipeline, and the W5 replacement sewage pipeline is equipped with a W5 replacement sewage valve. The instrument compressed air pipeline is connected to the hydrogen purification device and is used to supply instrument compressed air to the hydrogen purification device. The instrument compressed air pipeline is equipped with a W6 control valve. The CO2 replacement gas pipeline is connected to the hydrogen purification device and is used to provide CO2 replacement gas to the hydrogen purification device. The CO2 replacement gas pipeline is equipped with a W7 control valve.

3. A power generation device with hydrogen separation and purification function according to claim 2, characterized in that: The membrane separation and purification unit also includes a W1 replacement sewage pipe, a W3 replacement sewage pipe, and a W8 replacement sewage pipe; The W1 replacement sewage pipeline is connected to the pre-purification pipeline and is located between the W2 replacement sewage pipeline and the inlet of the hydrogen purification device. The W1 replacement sewage pipeline is equipped with a W1 control valve. The W3 replacement sewage pipeline is connected to the purified pipeline and is located downstream of the high-purity hydrogen outlet of the hydrogen purification device. The W3 replacement sewage pipeline is equipped with a W3 control valve. The W8 replacement sewage pipeline is connected to the hydrogen purification device and is used for replacement sewage discharge. The W8 replacement sewage pipeline is equipped with a W8 control valve.

4. A power generation device with hydrogen separation and purification function according to claim 2, characterized in that: The membrane separation and purification unit also includes a closed cooling water pipeline and a Φ22 pipeline; The closed cooling water pipeline is connected to the hydrogen purification device and is used to cool the hydrogen purification device. The closed cooling water pipeline is equipped with a W9 control valve. The Φ22 pipeline is connected to the purified pipeline.

5. A power generation device with hydrogen separation and purification function according to claim 1, characterized in that: The hydrogen purification device is a membrane separation type hydrogen purification device. The hydrogen gas input from the pre-purification pipeline is separated by the membrane, and high-purity hydrogen gas is output and sent out through the purified pipeline. At the same time, the separated waste gas is discharged through the exhaust gas pipeline.

6. A power generation device with hydrogen separation and purification function according to claim 1, characterized in that: The measurement and control unit includes an online purity detection module and a control module; The online purity detection module is used to detect the purity of hydrogen in real time; The control module is used to handle situations where the purity is lower than a first preset threshold. When the hydrogen recovery unit is activated, the membrane separation and purification unit is put into operation, making the membrane separation and purification unit operate in series with the hydrogen recovery unit; when the purity is higher than the second preset threshold... At this time, the membrane separation and purification unit is shut down, and only the hydrogen recovery unit operates independently.

7. A power generation device with hydrogen separation and purification function according to claim 6, characterized in that: When the control module controls the membrane separation and purification unit to start operation, it opens control valves W2 and W3 to connect the pre-purification pipeline and the post-purification pipeline to the hydrogen purification device. When the control module controls the membrane separation and purification unit to be cut off, it closes control valves W2 and W3 to isolate the hydrogen purification device from the hydrogen recovery unit.

8. A method for purifying hydrogen, applied to a power generation device with hydrogen separation and purification function as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Extract impurity-containing hydrogen gas from the high-pressure area of ​​the generator, and use the pressure difference between the high-pressure area and the low-pressure area of ​​the generator to drive the hydrogen gas flow. The hydrogen gas flows through oil separator A, hydrogen dryer and oil separator B in sequence to remove oil and dry the gas, and obtain pretreated hydrogen gas. S2. Detect hydrogen purity online via the measurement and control unit. ,when When the membrane separation and purification unit is turned on, the pretreated hydrogen gas enters the hydrogen purification device through the pre-purification pipeline for membrane separation and purification to obtain high-purity hydrogen gas. S3. High-purity hydrogen is purified and output through a pipeline, while the waste gas generated during the membrane separation process is discharged through the exhaust pipeline. S4. When the monitoring and control unit detects... When the membrane separation and purification unit is shut down, only the hydrogen recovery unit operates independently in a cycle.

9. The hydrogen purification method according to claim 8, characterized in that: In step S2, when the membrane separation and purification unit is started, control valves W2 and W3 are opened to connect the pre-purification pipeline and the post-purification pipeline to the hydrogen purification device. In step S4, when shutting down the membrane separation and purification unit, control valves W2 and W3 are closed to isolate the hydrogen purification device from the hydrogen recovery unit.

10. The hydrogen purification method according to claim 8, characterized in that: Before or after the membrane separation and purification unit is put into operation, CO2 replacement gas is introduced into the hydrogen purification device through the CO2 replacement gas pipeline and the W7 control valve, and the system is emptied and replaced through the W4 replacement sewage pipeline.

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