Hydrogen-cooled power generation device with hydrogen online purification function

Abstract

The utility model provides a hydrogen cooling power generation device with a hydrogen online purification function. The hydrogen cooling power generation device comprises a catalytic deoxidation module, an oil-gas separation module, a first membrane separation module, a second membrane separation module, an electrical control module and a power generator, the high-pressure side of the generator communicates with a catalytic deoxidation module through a pipeline, the output end of the catalytic deoxidation module communicates with an oil-gas separation module through a pipeline, and the output end of the oil-gas separation module communicates with a first membrane separation module and a second membrane separation module through pipelines; the first membrane separation module and the second membrane separation module are arranged in parallel, a passage is arranged between the first membrane separation module and the second membrane separation module in a communicating manner, multi-stage purification can be performed, and the converged output end of the first membrane separation module and the second membrane separation module is arranged on the low-pressure side of the generator through a pipeline in a communicating manner. Through the arrangement of the modules, the hydrogen recovery rate can be improved while the hydrogen purification purity is ensured.

Description

Technical Field

[0001] The utility model relates to the field of gas purification and refining, and in particular to a hydrogen-cooled power generation device with a hydrogen online purification function. Background Art

[0002] Hydrogen has the remarkable characteristics of low density and high heat transfer coefficient. When used as a cooling medium for generators, it can reduce ventilation losses, improve heat exchange efficiency and reduce the insulation aging rate. However, during the operation of the generator, the hydrogen purity will inevitably decrease due to factors such as hydrogen leakage, gas contamination, and moisture mixing. According to the provisions of "DL / T 1164-2012 Steam Turbine Generator Operation Guidelines", the hydrogen purity in water-hydrogen-cooled and fully hydrogen-cooled generators should reach 96% (by volume) or above. To improve efficiency, it is best to operate at above 98%, and the volume fraction of oxygen in hydrogen cannot exceed 0.5%. Once the hydrogen purity of the generator continues to be abnormal, it will not only reduce the cooling efficiency, increase ventilation losses, and cause local overheating, but it is more likely to cause a hydrogen explosion due to sparks generated by discharge.

[0003] In order to maintain high generator output, multiple means are needed to maintain hydrogen purity at above 98%. Currently, multiple methods have been used to improve hydrogen purity, such as increasing the frequency of hydrogen discharge and replenishment, installing hydrogen purification equipment, installing sealing oil filtration equipment, etc.; most power plants use hydrogen discharge and replenishment operations to solve the problem of low hydrogen purity, but when the hydrogen purity continues to decline, the frequency of hydrogen discharge and replenishment can be as high as 8 hours / time, indicating that simply increasing the number of hydrogen replenishments cannot fundamentally maintain hydrogen purity.

[0004] At present, some power plants have adopted hydrogen purification devices to improve the purity of hydrogen in generators, such as the comparative document with announcement number CN206069362U, which discloses a hydrogen-cooled generator set oil and gas separation and hydrogen purification device, including a hydrogen input pipeline, an oil-water separator, an explosion-proof compressor, an air cooler, a filter, a heater, a gas separator and a hydrogen output pipeline. A maintenance pipeline is connected between the hydrogen input pipeline and the first gas pipeline, and the maintenance pipeline is arranged in parallel with the oil-water separator. A maintenance valve is provided on the maintenance pipeline; the device adopts a generator hydrogen purification device with an oil-water separation → filtration → gas separation process. Although the hydrogen purity can be increased to more than 99%, there is still a small amount of hydrogen and separated oxygen in the purified exhaust gas, and a deoxidizer is required for exhaust gas treatment, indicating that the hydrogen recovery rate of the device has failed to meet expectations, and the proportion of oxygen in the purified exhaust gas is relatively large. , which increases the safety risks of the device; the purification efficiency of the hydrogen purification device is related to both the hydrogen purity and the recovery rate. Under the premise of ensuring the purity of the purified hydrogen, the hydrogen recovery rate better reflects the economy of the purification device. Therefore, although the device can remove oil, water and impurity gases in hydrogen, its economy and purification efficiency are relatively low; the gas separator in the device simultaneously completes the separation of impurities such as oxygen, nitrogen, and water, which will increase the purification burden of the separation device, reduce its service life, and also affect its hydrogen recovery rate; in addition, the device uses traditional filters to remove a small amount of oil and water in hydrogen, and the filter element needs to be maintained and regenerated regularly. Not only can continuous online purification not be achieved, but it also increases the workload of the unit operation and maintenance personnel. The comparison document discloses that the dust filtration particle size is ≤0.01μm. The higher the filtration accuracy, the more likely it is to cause the filter element to be blocked, which increases the operation and maintenance workload of the device. Utility Model Content

[0005] The technical problem to be solved by the utility model is how to improve the hydrogen recovery rate while ensuring the purity of hydrogen purification.

[0006] The utility model solves the above technical problems through the following technical means:

[0007] A hydrogen-cooled power generation device with a hydrogen online purification function comprises a catalytic deoxidation module (1), an oil-gas separation module (2), a first membrane separation module (3), a second membrane separation module (4), an electrical control module (5), and a generator (7); the high-voltage side of the generator (7) is connected to the catalytic deoxidation module (1) via a pipeline, the output end of the catalytic deoxidation module (1) is connected to the oil-gas separation module (2) via a pipeline, the output end of the oil-gas separation module (2) is connected to the first membrane separation module (3) and the second membrane separation module (4) via a pipeline, the first membrane separation module (3) and the second membrane separation module (4) are arranged in parallel, a passage is provided between the first membrane separation module (3) and the second membrane separation module (4) to enable multi-stage purification, and the output end where the first membrane separation module (3) and the second membrane separation module (4) meet is connected to the low-voltage side of the generator (7) via a pipeline; the electrical control module (5) is provided on the generator (7).

[0008] Beneficial effects: Through the setting of catalytic deoxygenation module, oil-gas separation module, first membrane separation module, second membrane separation module, electrical control module and generator, the purification process flow is optimized, and the three steps of deoxygenation → water and oil removal → membrane separation are carried out in sequence. First, oxygen is removed to reduce the oxygen content in the device and eliminate safety hazards in the purification process. Then, the oil and water impurities in the raw gas are removed simultaneously by the oil-gas separation module. Finally, other residual hydrocarbons, nitrogen and other impurity gases are removed by the membrane separation module. The membrane separation step can automatically switch to primary or secondary membrane separation, ensuring the hydrogen recovery rate and purification effect of the device.

[0009] Furthermore, the catalytic deoxidation module (1) comprises a first pneumatic valve (11), a first pressure gauge (12), a deoxidizer (13), and a hydrogen cooler (14); the first pneumatic valve (11) is connected to the high-pressure side of the generator (7) through a pipeline, and the first pressure gauge (12), the deoxidizer (13), and the hydrogen cooler (14) are sequentially connected to the back of the first pneumatic valve (11).

[0010] Beneficial effects: Through the setting of the first pneumatic valve, the first pressure gauge, the deoxidizer, and the hydrogen cooler, the first pneumatic valve and the first pressure gauge cooperate to control the flow rate of the raw gas. The deoxidizer can reduce the oxygen concentration in the raw gas to below 1ppm. The hydrogen cooler can condense the water vapor generated by the previous process and the water vapor contained in the raw gas into liquid water, which enters the next module together with the raw gas.

[0011] Furthermore, the deoxidizer (13) has a built-in palladium-based catalyst.

[0012] Beneficial effect: Through the setting of palladium-based catalyst, hydrogen and oxygen in the raw gas react to generate water, and the reaction can occur at room temperature.

[0013] Further, a temperature measuring element is arranged in the hydrogen cooler (14).

[0014] Beneficial effects: By arranging the temperature measuring element, the water vapor and raw material gas in the hydrogen cooler can be measured and cooled to 25-40℃ before being discharged.

[0015] Further, the oil-gas separation module (2) comprises a second pneumatic valve (21), a second pressure gauge (22), a two-phase separator (23), a third pneumatic valve (24), a compressor (25), and a blowdown valve (26); the second pneumatic valve (21) is connected after the catalytic deoxidation module (1), the second pressure gauge (22), the two-phase separator (23), the third pneumatic valve (24), and the compressor (25) are sequentially connected after the second pneumatic valve (21), the bottom of the two-phase separator (23) is provided with a blowdown port, the blowdown valve (26) is fixed on the blowdown port, and the two-phase separator (23) is provided with a liquid level sensor.

[0016] Beneficial effects: By arranging the second pneumatic valve, the second pressure gauge, the two-phase separator, the third pneumatic valve, the compressor, and the blowdown valve, the second pneumatic valve cooperates with the second pressure gauge to jointly control the flow rate of the raw material gas, the compressor is used for pressurization to make the raw material gas reach the membrane inlet pressure, the liquid level sensor monitors the separated liquid, and the liquid is discharged by the bottom blowdown valve when reaching the blowdown standard.

[0017] Further, the two-phase separator (23) is provided with a two-stage separation module, a vertical or inclined baffle is arranged in the first stage module to remove large droplets and oil droplets by gravity, and a vertical or inclined stainless steel filter screen is arranged in the second stage module to remove water vapor and oil mist by gravity.

[0018] Beneficial effects: By arranging the two-stage separation module, the large droplets, oil droplets, water vapor, and oil mist can all flow into the two-phase separator by gravity and be discharged.

[0019] Further, the compressor (25) is an explosion-proof compressor.

[0020] Beneficial effects: By arranging the explosion-proof compressor, the raw material gas can be pressurized to reach the specified membrane inlet pressure, and the safety is high.

[0021] Furthermore, the output end of the oil-gas separation module (2) is divided into two branch pipelines, one of which is fixed with a fourth pneumatic valve (31), and the other is fixed with a fifth pneumatic valve (41); the fourth pneumatic valve (31) is sequentially connected to a third pressure gauge (32), a first membrane separator (33), and a first hydrogen purity detector (34); the first membrane separator (33) is respectively connected to a first exhaust valve (35) and a sixth pneumatic valve (42) through a pipeline branch; the free end of the sixth pneumatic valve (42) is connected to the fifth pneumatic valve (41), and the The sixth pneumatic valve (42) is connected in sequence to a fourth pressure gauge (43), a second membrane separator (44), and a second hydrogen purity detector (45); the second membrane separator (44) is connected to a second exhaust valve (47) and a seventh pneumatic valve (46) through pipeline branches; the free end of the seventh pneumatic valve (46) is connected to the pipeline between the fourth pneumatic valve (31) and the third pressure gauge (32); the pipelines after the first hydrogen purity detector (34) and the second hydrogen purity detector (45) are connected to the low-pressure side of the generator (7) after merging.

[0022] Beneficial effect: Through the setting of the fourth pneumatic valve, the third pressure gauge, the first membrane separator, the first hydrogen purity detector, the first exhaust valve, the fifth pneumatic valve, the sixth pneumatic valve, the fourth pressure gauge, the second membrane separator, the second hydrogen purity detector, the seventh pneumatic valve, and the second exhaust valve, secondary separation can be achieved. When one of the membrane separation modules needs to be overhauled, the other membrane separation module can be replaced. When the membrane separator is overhauled, only the equipment to be overhauled is disconnected, and there is no need to shut down all the equipment for maintenance.

[0023] Furthermore, the first membrane separator (33) and the second membrane separator (44) both use hollow fiber organic separation membranes, and the first membrane separator (33) and the second membrane separator (44) are both provided with measurement and control elements, which can monitor the hydrogen recovery rate of the membrane separators online.

[0024] Furthermore, the gas pipeline of the oil-gas separation module (2) is fixed with a thermal insulation layer.

[0025] Beneficial effect: By setting up the insulation layer, the hydrogen inlet temperature is guaranteed to be between 25 and 40°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a hydrogen-cooled power generation device with an online hydrogen purification function according to a first embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of a hydrogen-cooled power generation device with an online hydrogen purification function according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a hydrogen-cooled power generation device with an online hydrogen purification function, including a catalytic deoxygenation module 1, an oil-gas separation module 2, a first membrane separation module 3, a second membrane separation module 4, an electrical control module 5, and a generator 7.

[0031] like Figure 1 As shown, the high-voltage side of the generator 7 is connected to a catalytic deoxidation module 1 through a pipeline, the output end of the catalytic deoxidation module 1 is connected to an oil-gas separation module 2 through a pipeline, the output end of the oil-gas separation module 2 is connected to a first membrane separation module 3 and a second membrane separation module 4 through a pipeline, the first membrane separation module 3 and the second membrane separation module 4 are arranged in parallel, and a passage is provided between the first membrane separation module 3 and the second membrane separation module 4 for multi-stage purification, the output end where the first membrane separation module 3 and the second membrane separation module 4 converge is connected to the low-voltage side of the generator 7 through a pipeline, and an electrical control module 5 is connected to the pipeline on the low-voltage side of the generator 7. In this embodiment, the electrical control module 5 is an electrical control box.

[0032] like Figure 1As shown, the catalytic deoxidation module 1 includes a first pneumatic valve 11, a first pressure gauge 12, a deoxidizer 13, and a hydrogen cooler 14; the first pneumatic valve 11 is connected to the high-pressure side of the generator 7 through a pipeline, and the hydrogen (raw gas) before purification enters the catalytic deoxidation module 1 through the pipeline, the first pressure gauge 12, the deoxidizer 13 and the hydrogen cooler 14 are sequentially connected to the first pneumatic valve 11, and the first pneumatic valve 11 and the first pressure gauge 12 cooperate to control the flow rate of the raw gas; the deoxidizer 13 has a built-in catalyst, and the catalyst does not need to be replaced or regenerated. The catalyst in this embodiment is a palladium-based catalyst. Under the catalysis of the agent, the hydrogen and oxygen in the raw gas react to generate water. This reaction can occur at room temperature. The catalyst can reduce the oxygen concentration in the raw gas to below 1ppm. The oxidation reaction is a highly exothermic reaction. The deoxygenated raw gas enters the hydrogen cooler 14 to complete cooling and condensation. The water vapor generated in the previous process and the water vapor contained in the raw gas are condensed into liquid water and enter the next module together with the raw gas. A temperature measuring element (not shown) is fixed in the hydrogen cooler 14 to cool the water vapor and raw gas to 25-40°C and then discharge them. The hydrogen cooler 14 is used to maintain an appropriate membrane entry temperature.

[0033] like Figure 1 As shown, the oil-gas separation module 2 includes a second pneumatic valve 21, a second pressure gauge 22, a two-phase separator 23, a third pneumatic valve 24, a compressor 25, and a drain valve 26; the second pneumatic valve 21 is connected after the hydrogen cooler 14, and the second pressure gauge 22, the two-phase separator 23, the third pneumatic valve 24, and the compressor 25 are connected to the second pneumatic valve 21 in sequence. The second pneumatic valve 21 cooperates with the second pressure gauge 22 to control the flow rate of the raw gas; the compressor 25 is used to pressurize the raw gas to reach the membrane inlet pressure. The compressor 25 in this embodiment is an explosion-proof compressor, which can ensure safety when pressurizing the raw gas. Safety; a sewage outlet is provided at the bottom of the two-phase separator 23, and a sewage valve 26 is fixed on the sewage outlet; the two-phase separator 23 has a built-in two-stage separation module, and the first-stage module is provided with a vertical or inclined baffle (not shown) to remove large droplets and oil droplets by gravity, and the second-stage module is provided with a vertical or inclined stainless steel filter (not shown) to remove water vapor and oil mist by gravity. The separated liquid is monitored by a liquid level sensor (not shown) and is discharged from the bottom sewage outlet after meeting the sewage discharge standard, without stopping the machine to replace the filter element; the gas pipeline of the oil and gas separation module 2 in this embodiment is fixed with an insulation layer to ensure that the hydrogen inlet membrane temperature is between 25 and 40°C.

[0034] like Figure 1As shown, the first membrane separation module 3 includes a fourth pneumatic valve 31, a third pressure gauge 32, a first membrane separator 33, a first hydrogen purity detector 34, and a first exhaust valve 35; the second membrane separation module 4 includes a fifth pneumatic valve 41, a sixth pneumatic valve 42, a fourth pressure gauge 43, a second membrane separator 44, a second hydrogen purity detector 45, a seventh pneumatic valve 46, and a second exhaust valve 47; the output end of the compressor 25 is divided into two branch pipelines, one branch pipeline is fixed with the fourth pneumatic valve 31, and the other branch pipeline is fixed with the fifth pneumatic valve 41; the third pressure gauge 32, the first membrane separator 33, and the first hydrogen purity detector 34 are sequentially connected to the fourth pneumatic valve 31, and the first membrane separator 33 is respectively connected to the first exhaust valve 35 and the sixth pneumatic valve 42 through pipeline branches. After the free end of the sixth pneumatic valve 42 is connected to the fifth pneumatic valve 41, the fourth pressure gauge 43, the second membrane separator 44 , the second hydrogen purity detector 45 is connected to the sixth pneumatic valve 42 in sequence, and the second membrane separator 44 is connected to the second exhaust valve 47 and the seventh pneumatic valve 46 through pipeline branches. The free end of the seventh pneumatic valve 46 is connected to the pipeline between the fourth pneumatic valve 31 and the third pressure gauge 32. The pipelines after the first hydrogen purity detector 34 and the second hydrogen purity detector 45 are connected to the low-pressure side of the generator 7 after merging; the electrical control module 5 is connected to the pipeline after the first membrane separation module 3 and the second membrane separation module 4 are merged; in this embodiment, the first membrane separator 33 and the second membrane separator 44 are of the same model, using a hollow fiber organic separation membrane with good separation effect and low price, and include measurement and control components, which can monitor the hydrogen recovery rate of the membrane separator online. The first membrane separator 33 and the second membrane separator 44 are both existing technologies, which are used to separate dissolved gases such as nitrogen, methane, acetylene, etc.

[0035] like Figure 1 As shown, the electrical control module 5 is connected to all the pressure gauges, pneumatic valves and measurement and control elements of each module, and can realize basic functions such as controlling the valve opening according to the pressure signal, controlling the working parameters of the hydrogen cooler according to the temperature signal, controlling the membrane separation mode according to the hydrogen recovery rate signal, and the sound and light alarm for gas leakage. The control program of the electrical control module 5 is the existing technology.

[0036] The specific method for hydrogen purification is:

[0037] Step 1: The raw gas enters the catalytic deoxidation module 1 from the high-pressure side of the generator 7; the hydrogen pressure of the generator 7 is usually 0.3-0.5 MPa, so the raw gas can enter the catalytic deoxidation module 1 without being pressurized; the first pneumatic valve 11 and the first pressure gauge 12 jointly control the valve opening to adjust the gas flow. After the raw gas enters the catalytic deoxidation module 1 at room temperature, it is first catalytically deoxidized by the deoxidizer 13. The deoxidizer 13 can react the hydrogen and oxygen in the raw gas to generate water under the catalysis of a palladium-based catalyst. This reaction can occur at room temperature and can reduce the oxygen concentration in the raw gas to below 1 ppm. Since this reaction is a highly exothermic reaction, the product will enter the next step together with the raw gas in the form of water vapor; the deoxidized raw gas enters the hydrogen cooler 14 to complete cooling and condensation. The water vapor generated in the previous process and the water vapor contained in the raw gas are condensed into liquid water and enter the next module together with the raw gas.

[0038] Step 2: The raw gas purified by the catalytic deoxygenation module 1 flows into the oil-gas separation module 2. The second pneumatic valve 21 and the second pressure gauge 22 jointly control the valve opening to adjust the gas flow rate. The raw gas then passes through the two-phase separator 23 to remove liquid impurities such as water and oil. After being pressurized by the third pneumatic valve 24 and the explosion-proof compressor 25, it enters the membrane separation process.

[0039] Step 3: The membrane separation process is divided into two modes:

[0040] Mode A: When the gas recovery rate monitored by the measurement and control element in the first membrane separator 33 is higher than 85%, only the first membrane separation module 3 is used for raw gas purification. The specific separation process at this time is as follows: the fourth pneumatic valve 31 is opened. The fourth pneumatic valve 31 and the third pressure gauge 32 jointly control the membrane inlet flow rate. The raw gas is separated in the first membrane separator 33. The separated hydrogen is tested by the first hydrogen purity meter 34 and then enters the low-pressure side of the generator 7 to complete the purification process. The exhaust gas is directly discharged through the first exhaust valve 35.

[0041] Mode B: When the gas recovery rate monitored by the measurement and control element in the first membrane separator 33 is lower than 85%, both membrane separators are put into operation. Taking the first membrane separation module 3 as the primary separation and the second membrane separation module 4 as the secondary separation as an example, the specific separation process at this time is: open the fourth pneumatic valve 31, the fourth pneumatic valve 31 and the third pressure gauge 32 jointly control the membrane inlet flow rate, the raw gas completes the primary separation in the first membrane separator 33, the separated hydrogen enters the low-pressure side of the generator 7 after detection by the first hydrogen purity meter 34, the tail gas enters the second membrane separation module 4 through the sixth pneumatic valve 42, the sixth pneumatic valve 42 and the fourth pressure gauge 43 jointly control the membrane inlet flow rate, completes the secondary separation in the second membrane separator 44, the separated hydrogen enters the low-pressure side of the generator 7 after detection by the second hydrogen purity meter 45, and the exhaust gas generated in the second membrane separator 44 is directly discharged by the second exhaust valve 47.

[0042] Step 4: When the recovery rate of the first membrane separation module 3 continues to drop below 60%, close the fourth pneumatic valve 31 and disconnect the first membrane separation module 3 for maintenance and overhaul; open the fifth pneumatic valve 41, only put the second membrane separation module 4 into operation, and switch to mode A to proceed to step 3; after the overhaul of the first membrane separation module 3 is completed and the recovery rate of the second membrane separation module 4 drops below 85%, switch to mode B with the second membrane separation module 4 as the primary separation and the first membrane separation module 3 as the secondary separation to continue to complete step 3.

[0043] The device can realize continuous online purification; the catalyst used in the deoxidizer 13 can be recycled and does not need to be removed, replaced or replenished; the two-phase separator 23 can discharge sewage online; when the membrane separator is repaired, only the equipment to be repaired is disconnected, and there is no need to shut down the entire device for repair; the operating temperature of the device is within the room temperature range (25-40°C), and only the residual heat of the reaction of the deoxidizer 13 and the hydrogen cooler 14 is used to maintain the operating temperature throughout the process. The membrane inlet pressure of the membrane separator is maintained by a compressor 25. There is no other temperature or pressure change operation, which effectively reduces the energy consumption of the device and reduces the difficulty of operating the device.

[0044] Example 2

[0045] like Figure 2 As shown, the difference between this embodiment and the first embodiment is that, based on the first embodiment, a hydrogen-cooled power generation device with an online hydrogen purification function further includes a gas replacement module 6, and the generator 7 is provided with a gas replacement module 6; the gas replacement module 6 includes a first gas replacement valve 61, a second gas replacement valve 62, a third gas replacement valve 63, a fourth gas replacement valve 64, and a gas replacement pipeline corresponding to the number of replacement valves; the four valves and replacement pipelines are respectively arranged around the generator 7, the third gas replacement valve 63 is connected to the high-pressure side of the generator 7 through the replacement pipeline, and the fourth gas replacement valve 64 is connected to the low-pressure side of the generator 7 through the replacement pipeline; when performing gas replacement, the replacement pipeline can be connected to a gas cylinder (not shown) or a detection instrument (not shown).

[0046] During use, based on Example 1, the gas replacement process is as follows: when the unit needs to replace the gas of the generator 7 and each module due to factors such as shutdown and maintenance, the first gas replacement valve 61 and the second gas replacement valve 62 are opened, and the CO2 gas cylinder used for replacement is connected to the gas replacement pipeline, and the hydrogen in the generator 7 and each module is replaced with CO2; after the CO2 replacement is completed, the first gas replacement valve 61 and the second gas replacement valve 62 are closed, and the third gas replacement valve 63 and the fourth gas replacement valve 64 are opened, and compressed air is connected to replace the CO2 in the generator 7 and each module with compressed air to complete the gas replacement.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydrogen-cooled power generation device with online hydrogen purification function, characterized in that: It comprises a catalytic deoxidation module (1), an oil-gas separation module (2), a first membrane separation module (3), a second membrane separation module (4), an electrical control module (5), and a generator (7); The high-voltage side of the generator (7) is connected to a catalytic deoxidation module (1) via a pipeline, the output end of the catalytic deoxidation module (1) is connected to an oil-gas separation module (2) via a pipeline, the output end of the oil-gas separation module (2) is connected to a first membrane separation module (3) and a second membrane separation module (4) via a pipeline, the first membrane separation module (3) and the second membrane separation module (4) are arranged in parallel, a passage is provided between the first membrane separation module (3) and the second membrane separation module (4) to enable multi-stage purification, the output end where the first membrane separation module (3) and the second membrane separation module (4) meet is connected to the low-voltage side of the generator (7) via a pipeline, and an electrical control module (5) is provided on the generator (7).

2. A hydrogen-cooled power generation device with online hydrogen purification function according to claim 1, characterized in that: The catalytic deoxidation module (1) comprises a first pneumatic valve (11), a first pressure gauge (12), a deoxidizer (13), and a hydrogen cooler (14); the first pneumatic valve (11) is connected to the high-pressure side of the generator (7) through a pipeline, and the first pressure gauge (12), the deoxidizer (13), and the hydrogen cooler (14) are sequentially connected to the back of the first pneumatic valve (11).

3. The hydrogen-cooled power generation device with online hydrogen purification function according to claim 2, characterized in that: The deoxidizer (13) has a built-in palladium-based catalyst.

4. The hydrogen-cooled power generation device with online hydrogen purification function according to claim 2, characterized in that: A temperature measuring element is provided in the hydrogen cooler (14).

5. The hydrogen-cooled power generation device with online hydrogen purification function according to claim 1, characterized in that: The oil-gas separation module (2) comprises a second pneumatic valve (21), a second pressure gauge (22), a two-phase separator (23), a third pneumatic valve (24), a compressor (25), and a drain valve (26); the second pneumatic valve (21) is connected to the catalytic deoxidation module (1); the second pressure gauge (22), the two-phase separator (23), the third pneumatic valve (24), and the compressor (25) are connected to the second pneumatic valve (21) in sequence; a drain outlet is provided at the bottom of the two-phase separator (23); a drain valve (26) is fixed to the drain outlet; and a liquid level sensor is provided in the two-phase separator (23).

6. The hydrogen-cooled power generation device with online hydrogen purification function according to claim 5, characterized in that: The two-phase separator (23) has a built-in two-stage separation module. The first-stage module is provided with a vertical or inclined baffle to remove large liquid droplets and oil droplets by gravity, and the second-stage module is provided with a vertical or inclined stainless steel filter to remove water vapor and oil mist by gravity.

7. The hydrogen-cooled power generation device with online hydrogen purification function according to claim 5, characterized in that: The compressor (25) is an explosion-proof compressor.

8. The hydrogen-cooled power generation device with online hydrogen purification function according to claim 1, characterized in that: The output end of the oil-gas separation module (2) is divided into two branch pipelines, one of which is fixed with a fourth pneumatic valve (31), and the other is fixed with a fifth pneumatic valve (41); the fourth pneumatic valve (31) is sequentially connected to a third pressure gauge (32), a first membrane separator (33), and a first hydrogen purity detector (34); the first membrane separator (33) is respectively connected to a first exhaust valve (35) and a sixth pneumatic valve (42) through pipeline branches; after the free end of the sixth pneumatic valve (42) is connected to the fifth pneumatic valve (41), the first exhaust valve (35) and the sixth pneumatic valve (42) are connected to the first membrane separator (33); The sixth pneumatic valve (42) is connected in sequence to a fourth pressure gauge (43), a second membrane separator (44), and a second hydrogen purity detector (45); the second membrane separator (44) is connected to a second exhaust valve (47) and a seventh pneumatic valve (46) through pipeline branches; the free end of the seventh pneumatic valve (46) is connected to the pipeline between the fourth pneumatic valve (31) and the third pressure gauge (32); the pipelines after the first hydrogen purity detector (34) and the second hydrogen purity detector (45) are connected to the low-pressure side of the generator (7) after merging.

9. The hydrogen-cooled power generation device with online hydrogen purification function according to claim 8, characterized in that: The first membrane separator (33) and the second membrane separator (44) both use hollow fiber organic separation membranes. The first membrane separator (33) and the second membrane separator (44) are both provided with measurement and control elements capable of online monitoring of the hydrogen recovery rate of the membrane separators.

10. The hydrogen-cooled power generation device with online hydrogen purification function according to claim 1, characterized in that: The gas pipeline of the oil-gas separation module (2) is fixed with a thermal insulation layer.

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