High-temperature resistant SPE water electrolysis system and control method

Abstract

This invention discloses a high-temperature resistant SPE water electrolysis system and control method. The system includes an electrolyzer with one inlet and two outlets; a hydrogen pipeline connected to one outlet of the electrolyzer, with a ball valve, a hydrogen separator, and a hydrogen-side outlet valve sequentially connected along the hydrogen flow direction; an oxygen pipeline connected to the other outlet of the electrolyzer, with a ball valve, an oxygen separator, and an oxygen-side outlet valve sequentially connected along the oxygen flow direction; a circulation pipeline with its inlet connected to both the hydrogen separator and the oxygen separator, and a high-temperature pipeline and a low-temperature pipeline connected in parallel at the outlet of the circulation pipeline, with a water purification filter connected in the low-temperature pipeline; a mixing tank with two inputs connected to the high-temperature pipeline and the low-temperature pipeline, and its output connected to the inlet of the electrolyzer; and a control subsystem capable of real-time monitoring of the system's water temperature and quality, and controlling the operating parameters of relevant equipment based on the monitoring information to deliver circulating water at the required temperature into the electrolyzer.

Description

Technical Field

[0001] This invention relates to the field of SPE water electrolysis for hydrogen production technology, and in particular to a high-temperature resistant SPE water electrolysis system and control method. Background Technology

[0002] In the field of SPE (Solid Polymer Electrolyte) water electrolysis for hydrogen production, industrial applications typically use resins for online purification of the circulating electrolyte to ensure the quality of the inlet water to the electrolyzer. This prevents irreversible damage to the proton exchange membrane caused by low-quality water, which could then affect the entire hydrogen production equipment. Currently, the temperature resistance of mixed-bed resins generally does not exceed 60℃. When the temperature exceeds 60℃, their purification capacity drops sharply, and the resin itself decomposes and fails at high temperatures. If the resin ruptures, fine particles can enter the electrolyzer, causing blockages in the flow channels and other problems, thus affecting the performance of the electrolyzer. In SPE water electrolysis for hydrogen production, the proton exchange membrane typically performs optimally at 80℃; therefore, the resin limits the operating temperature of the entire system. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature resistant SPE electrolysis water system and control method to solve the problem that existing resins cannot meet the requirements for efficient system operation.

[0004] The above-mentioned objectives of the present invention can be achieved by the following technical solutions:

[0005] This invention provides a high-temperature resistant SPE water electrolysis system, comprising:

[0006] The electrolytic cell has one inlet and two outlets.

[0007] A hydrogen pipeline is connected to one outlet end of the electrolyzer, and a ball valve, a hydrogen separator, and a hydrogen-side outlet valve are sequentially connected in the hydrogen pipeline along the direction of hydrogen flow.

[0008] An oxygen pipeline is connected to another outlet end of the electrolyzer, and a ball valve, an oxygen separator, and an oxygen-side outlet valve are sequentially connected in the oxygen pipeline along the direction of oxygen flow.

[0009] The circulation pipeline has its inlet end connected to the hydrogen separator and the oxygen separator respectively to collect circulating water. The outlet of the circulation pipeline is connected in parallel to a high-temperature pipeline and a low-temperature pipeline so that the circulating water flowing into it can be heat-exchanged by the cooling water pipeline. A water purification filter is connected to the low-temperature pipeline.

[0010] The mixing tank has two input terminals connected to the high-temperature pipeline and the low-temperature pipeline, respectively, and an output terminal connected to the inlet of the electrolytic cell.

[0011] The control subsystem can monitor in real time the water temperature flowing out of the circulation pipeline, the water temperature and quality after heat exchange in the low-temperature pipeline, the water temperature and quality after water purification and filtration, the water temperature and quality after heat exchange in the high-temperature pipeline, and the water temperature and quality flowing into the electrolytic cell. Based on the monitoring information, it controls the operating parameters of relevant equipment to send circulating water with the required temperature into the electrolytic cell.

[0012] Preferably, the control subsystem includes a rectifier control center and a first temperature detection device, a second temperature detection device, a third temperature detection device, a fourth temperature detection device, a fifth temperature detection device, a first water quality detection device, a second water quality detection device, and a third water quality detection device electrically connected to the rectifier control center.

[0013] The first temperature detection device is used to monitor the water temperature flowing out of the circulation pipeline, the second temperature detection device is used to monitor the water temperature after heat exchange in the low-temperature pipeline, the third temperature detection device is used to monitor the water temperature after water purification and filtration in the low-temperature pipeline, the fourth temperature detection device is used to monitor the water temperature flowing into the electrolytic cell, and the fifth temperature detection device is used to monitor the water temperature after heat exchange in the high-temperature pipeline.

[0014] The first water quality detection device is used to monitor the water quality flowing into the electrolytic cell, the second water quality detection device is used to monitor the water quality in the low-temperature pipeline after water purification and filtration, and the third water quality detection device is used to monitor the water quality in the high-temperature pipeline after heat exchange.

[0015] Preferably, the circulation pipeline is sequentially connected to a ball valve, a circulation pump, and the first temperature detection device along the water flow direction. The ball valve can cut off or open the pipeline through which the circulating water enters the circulation pump.

[0016] Preferably, the low-temperature pipeline is sequentially connected to the following components along the water flow direction: a first valve group, a first heat exchanger, a second temperature detection device, a flow meter, a first three-way solenoid valve, a water purification filter, a second three-way solenoid valve, the third temperature detection device, the second water quality detection device, a resin trap, and a ball valve.

[0017] The first valve group includes a first diaphragm regulating valve and a first bypass shut-off valve connected in parallel to the low-temperature pipeline to keep the low-temperature pipeline unobstructed in the event of a failure of the first diaphragm regulating valve or the first bypass shut-off valve; the first three-way solenoid valve is connected to the two input terminals of the water purification filter, and the second three-way solenoid valve is connected to the two output terminals of the water purification filter.

[0018] The rectifier control center is electrically connected to the first diaphragm regulating valve, the first three-way solenoid valve, and the second three-way solenoid valve to respond to control commands from the rectifier control center.

[0019] Preferably, the high-temperature pipeline is sequentially connected to a second valve group, a second heat exchanger, a flow meter, the fifth temperature detection device, a ball valve, and the third water quality detection device along the water flow direction;

[0020] The second valve group includes a second diaphragm regulating valve and a second bypass shut-off valve connected in parallel to the high-temperature pipeline to keep the high-temperature pipeline unobstructed in the event of a failure of the second diaphragm regulating valve or the second bypass shut-off valve.

[0021] The rectifier control center is electrically connected to the second diaphragm regulating valve to respond to control commands from the rectifier control center.

[0022] Preferably, the first water quality detection device and the fourth temperature detection device are sequentially connected in the pipeline connecting the mixing tank and the electrolytic cell along the water flow direction.

[0023] Preferably, the cooling water pipeline includes:

[0024] A cooling water inlet pipe has two inlet branch pipes connected in parallel to supply cooling water to the first heat exchanger and the second heat exchanger respectively.

[0025] The cooling water outlet pipe has two inlet branch pipes connected in parallel to receive cooling water that has undergone heat exchange from the first heat exchanger and the second heat exchanger, respectively.

[0026] Each of the inlet branch pipes is equipped with a bypass ball valve and a solenoid valve connected in parallel to maintain the unobstructed flow of the inlet branch pipe in the event of a malfunction of the bypass ball valve or the solenoid valve. The solenoid valve is electrically connected to the rectifier control center to respond to control commands from the rectifier control center.

[0027] Preferably, when the circulating water in the water purification filter is in the first flow direction, the rectifier control center can control the first output port of the first three-way solenoid valve and the first input port of the second three-way solenoid valve to connect.

[0028] When the circulating water in the water purification filter is in the second flow direction, the rectifier control center can control the connection between the second output port of the first three-way solenoid valve and the second input port of the second three-way solenoid valve.

[0029] Preferably, the electrolytic cell has a drain valve; and / or the water purification filter has an exhaust valve.

[0030] This invention also provides a control method for a high-temperature resistant SPE water electrolysis system, wherein the following steps are performed using any of the aforementioned high-temperature resistant SPE water electrolysis systems:

[0031] While the electrolyzer is in operation, the water temperature flowing out of the circulation pipeline, the water temperature and quality after heat exchange in the low-temperature pipeline, the water temperature and quality after water purification and filtration, the water temperature and quality after heat exchange in the high-temperature pipeline, and the water temperature and quality flowing into the electrolyzer are monitored in real time.

[0032] The control subsystem generates control commands based on the monitored information to control the operating parameters of relevant equipment in each pipeline so as to send circulating water with the required temperature into the electrolytic cell for electrolysis.

[0033] The circulating water fed into the electrolytic cell should ensure that both the water temperature and water quality meet the preset requirements.

[0034] This invention has at least the following features and advantages:

[0035] This invention adjusts the parameters of temperature and water quality by setting up high-temperature and low-temperature pipelines, thereby increasing the temperature while ensuring water quality, improving system operating efficiency, and reducing energy consumption. 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 structural block diagram of the high-temperature resistant SPE electrolysis water system of the present invention.

[0038] Figure labels and descriptions:

[0039] 1. Electrolytic cell; 2. Ball valve; 3. Oxygen separator; 4. Ball valve; 5. Circulating pump; 6. First diaphragm regulating valve; 7. First bypass shut-off valve; 8. First heat exchanger; 9. Flow meter; 10. First three-way solenoid valve; 11. Water purification filter; 12. Second three-way solenoid valve; 13. Resin trap; 14. Ball valve; 15. Mixing tank; 16. Second diaphragm regulating valve; 17. Second bypass shut-off valve; 18. Second heat exchanger; 19. Flow meter; 20. Ball valve; 21. First bypass ball valve; 22. ... 1. Solenoid valve; 23. Second bypass ball valve; 24. Second solenoid valve; 25. Ball valve; 26. Hydrogen separator; 27. First temperature detection device; 28. Second temperature detection device; 29. ​​Third temperature detection device; 30. Fourth temperature detection device; 31. Fifth temperature detection device; 32. First water quality detection device; 33. Second water quality detection device; 34. Third water quality detection device; 35. Rectifier control center; 36. Drain valve; 37. Exhaust valve; 38. Hydrogen-side outlet valve; 39. Oxygen-side outlet valve. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below 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 are within the scope of protection of the present invention.

[0041] Implementation Method 1

[0042] This invention provides one such method; please refer to [link / reference]. Figure 1 It includes an electrolyzer, hydrogen pipeline, oxygen pipeline, circulation pipeline, mixing tank, and control subsystem.

[0043] Specifically, the electrolyzer has one inlet and two outlets; a hydrogen pipeline is connected to one outlet of the electrolyzer, and along the flow direction of hydrogen, a ball valve, a hydrogen separator, and a hydrogen-side outlet valve 38 are sequentially connected in the hydrogen pipeline; an oxygen pipeline is connected to the other outlet of the electrolyzer, and along the flow direction of oxygen, a ball valve, an oxygen separator, and an oxygen-side outlet valve 39 are sequentially connected in the oxygen pipeline; the inlet of the circulation pipeline is connected to both the hydrogen separator and the oxygen separator to collect circulating water, and the outlet of the circulation pipeline is connected in parallel to a high-temperature pipeline and a low-temperature pipeline to utilize cooling water pipelines respectively. The circulating water undergoes heat exchange treatment, and a water purification filter is connected to the low-temperature pipeline. The mixing tank has two input ends connected to the high-temperature pipeline and the low-temperature pipeline respectively, and the output end is connected to the inlet end of the electrolytic cell. The control subsystem can monitor in real time the water temperature flowing out of the circulating pipeline, the water temperature and water quality after heat exchange and after water purification and filtration in the low-temperature pipeline, the water temperature and water quality after heat exchange in the high-temperature pipeline, and the water temperature and water quality flowing into the electrolytic cell. Based on the monitoring information, it controls the operating parameters of relevant equipment to send circulating water with the required temperature into the electrolytic cell.

[0044] In some embodiments, the control subsystem includes a rectifier control center and a first temperature detection device, a second temperature detection device, a third temperature detection device, a fourth temperature detection device, a fifth temperature detection device, a first water quality detection device, a second water quality detection device, and a third water quality detection device electrically connected to the rectifier control center.

[0045] The first temperature detection device is used to monitor the water temperature flowing out of the circulation pipeline. The second temperature detection device is used to monitor the water temperature after heat exchange in the low-temperature pipeline. The third temperature detection device is used to monitor the water temperature after water purification and filtration in the low-temperature pipeline. The fourth temperature detection device is used to monitor the water temperature flowing into the electrolytic cell. The fifth temperature detection device is used to monitor the water temperature after heat exchange in the high-temperature pipeline.

[0046] The first water quality testing device is used to monitor the water quality flowing into the electrolytic cell, the second water quality testing device is used to monitor the water quality in the low-temperature pipeline after water purification and filtration, and the third water quality testing device is used to monitor the water quality in the high-temperature pipeline after heat exchange.

[0047] In some embodiments, see Figure 1 The circulating pipeline is connected in sequence along the water flow direction by a ball valve, a circulating pump, and a first temperature detection device. The ball valve can cut off or open the pipeline from which the circulating water enters the circulating pump.

[0048] In some embodiments, see Figure 1 The low-temperature pipeline is connected in sequence along the water flow direction to the first valve group, the first heat exchanger, the second temperature detection device, the flow meter, the first three-way solenoid valve, the water purification filter, the second three-way solenoid valve, the third temperature detection device, the second water quality detection device, the resin trap, and the ball valve.

[0049] The first valve group includes a first diaphragm regulating valve and a first bypass shut-off valve connected in parallel to the low-temperature pipeline to keep the low-temperature pipeline unobstructed in the event of a failure of the first diaphragm regulating valve or the first bypass shut-off valve; the first three-way solenoid valve is connected to the two input ends of the water purification filter, and the second three-way solenoid valve is connected to the two output ends of the water purification filter.

[0050] The rectifier control center is electrically connected to the first diaphragm regulating valve, the first three-way solenoid valve, and the second three-way solenoid valve to respond to control commands from the rectifier control center.

[0051] In some embodiments, see Figure 1 The high-temperature pipeline is connected in sequence along the water flow direction to the second valve group, the second heat exchanger, the flow meter, the fifth temperature detection device, the ball valve, and the third water quality detection device;

[0052] The second valve group includes a second diaphragm regulating valve and a second bypass shut-off valve connected in parallel to the high-temperature pipeline to keep the high-temperature pipeline unobstructed in the event of a failure of the second diaphragm regulating valve or the second bypass shut-off valve.

[0053] The rectifier control center is electrically connected to the second diaphragm regulating valve to respond to control commands from the rectifier control center.

[0054] In some embodiments, see Figure 1 The first water quality detection device and the fourth temperature detection device are sequentially connected in the pipeline connecting the mixing tank and the electrolytic cell along the water flow direction.

[0055] In some embodiments, see Figure 1 The cooling water pipeline includes a cooling water inlet pipe and a cooling water outlet pipe. Specifically, the cooling water inlet pipe has two inlet branch pipes connected in parallel to supply cooling water to the first heat exchanger and the second heat exchanger, respectively; the cooling water outlet pipe has two inlet branch pipes connected in parallel to receive cooling water that has undergone heat exchange from the first heat exchanger and the second heat exchanger, respectively; each inlet branch pipe is equipped with a bypass ball valve and a solenoid valve connected in parallel to maintain the unobstructed flow of the inlet branch pipe in the event of a failure of the bypass ball valve or the solenoid valve, and the solenoid valve is electrically connected to the rectifier control center to respond to control commands from the rectifier control center.

[0056] In some embodiments, when the circulating water in the water purification filter is in a first flow direction, the rectifier control center can control the first output port of the first three-way solenoid valve and the first input port of the second three-way solenoid valve to be connected; when the circulating water in the water purification filter is in a second flow direction, the rectifier control center can control the second output port of the first three-way solenoid valve and the second input port of the second three-way solenoid valve to be connected.

[0057] In some embodiments, see Figure 1 The electrolytic cell has a drain valve 36; and / or the water purification filter has an exhaust valve 37.

[0058] This invention adjusts the parameters of temperature and water quality by setting up high-temperature and low-temperature pipelines, thereby increasing the temperature while ensuring water quality, improving system operating efficiency, and reducing energy consumption.

[0059] The present invention will be further described below through several specific embodiments. Please refer to [link / reference]. Figure 1 :

[0060] The system of the present invention comprises an electrolytic cell, an oxygen separator, a hydrogen separator, a circulating pump, a heat exchanger, a flow meter, a water purification filter, a resin trap, a mixing tank, a rectifier control center, and corresponding valves, pipelines, and a main structural frame.

[0061] The hydrogen and oxygen outlet of the electrolyzer is connected to the hydrogen-oxygen separator via a ball valve. Under the action of DC power, hydrogen and oxygen are generated. Hydrogen enters the hydrogen separator through the ball valve, and oxygen enters the oxygen separator through the ball valve. Hydrogen and oxygen are separated into gas and liquid in the hydrogen and oxygen separators respectively. The separated electrolyte enters the circulation pump through the ball valve.

[0062] A circulating pump provides the power for electrolyte circulation. The circulating water then enters two separate pipelines: a low-temperature pipeline and a high-temperature pipeline. The low-temperature pipeline is equipped with a diaphragm regulating valve, with a shut-off valve connected in parallel. In case of a diaphragm regulating valve failure, the shut-off valve can be opened as a bypass. The circulating water from the low-temperature pipeline passes through the diaphragm regulating valve into a heat exchanger for cooling. The heat exchanger outlet is connected to a flow meter, and the flow meter outlet is connected to a three-way solenoid valve. One outlet of the three-way solenoid valve is connected to the upper port of a water purification filter, and the other outlet is connected to the lower port of the water purification filter. The upper and lower outlets of the other end of the water purification filter are connected to the two inlets of the three-way solenoid valve, respectively. After ion exchange in the water purification filter, the circulating water enters a resin trap via the three-way solenoid valve. The resin trap is connected to a mixing tank via a ball valve.

[0063] The circulating pump provides circulation power for the electrolyte, and then the circulating water is divided into two pipelines: a low-temperature pipeline and a high-temperature pipeline. A diaphragm regulating valve is installed on the high-temperature pipeline, and a bypass shut-off valve is installed on the diaphragm regulating valve to prevent malfunction. The diaphragm regulating valve is connected to the heat exchanger. After heat exchange, the circulating water enters the flow meter, which is connected to the mixing tank through a ball valve. The high-temperature circulating water in the high-temperature pipeline and the low-temperature circulating water in the low-temperature pipeline are mixed in the mixing tank to maintain the inlet water temperature of the electrolyzer.

[0064] Two three-way solenoid valves are installed at the inlet and outlet of the water purification filter. When the resin in the water purification filter becomes clogged, the flow direction of the circulating water in the water purification filter is adjusted by switching the inlet and outlet of the three-way solenoid valves. The flow directions are forward flow and counterflow. Forward flow means that the circulating water enters from the upper inlet on the inlet side of the water purification filter and exits from the lower outlet on the outlet side. Counterflow means that the circulating water enters from the lower inlet on the inlet side of the water purification filter and exits from the upper outlet on the outlet side of the water purification filter.

[0065] The circulating water from the high-temperature pipeline enters the heat exchanger through the membrane regulating valve, is cooled, and then enters the mixing tank through the flow meter to mix with the circulating water from the low-temperature pipeline. It then enters the electrolytic cell for electrolysis to complete the cycle.

[0066] The cooling water inlet pipes are equipped with inlet solenoid valves for the first and second heat exchangers, as well as their bypass valves, to control the cooling water usage.

[0067] In some specific embodiments, please refer to Figure 1 The system consists of an electrolytic cell, an oxygen separator, a hydrogen separator, a circulating pump, a heat exchanger, a flow meter, a water purification filter, a resin trap, a mixing tank, a rectifier control center, and corresponding valves, pipelines, and a main structural frame.

[0068] Under the action of DC power, the circulating water in electrolytic cell 1 undergoes electrolysis to produce hydrogen and oxygen. The oxygen enters the oxygen separator 3 through ball valve 2, and the hydrogen enters the hydrogen separator 26 through ball valve 25. After the hydrogen and oxygen are separated, the circulating water enters the circulating pump 5 through the pipe connecting the bottom of the hydrogen separator and the oxygen separator, and then through ball valve 4. Ball valve 4 is used to disconnect the circulating pump 5 from the hydrogen-oxygen separator. When the circulating pump 5 needs to be replaced, ball valve 4 is closed and the circulating pump 5 is replaced.

[0069] Circulating water enters circulating pump 5, which provides circulation power for the electrolyte. The circulating water then splits into two pipelines (a low-temperature pipeline and a high-temperature pipeline). In the low-temperature pipeline, the circulating water passes through the first diaphragm regulating valve 6 and then enters the first heat exchanger 8 for heat exchange and cooling. The cooled circulating water then passes through flow meter 9 and enters the first three-way solenoid valve 10. The first bypass shut-off valve 7 is connected in parallel with the first diaphragm regulating valve 6. If the first diaphragm regulating valve 6 fails, operation can continue by opening the first bypass shut-off valve 7. The first diaphragm regulating valve 6 can be pneumatic or electric.

[0070] The circulating water in the low-temperature pipeline enters the first three-way solenoid valve 10 from the flow meter 9. Depending on the actual situation, when the resin becomes clogged, it is necessary to adjust the inlet and outlet of the water purification filter 11 to change the flow rate of the circulating water, clear the blockage, and keep the pipeline unobstructed. Under the control of the rectifier control center, the circulating water in the water purification filter 11 can be divided into co-current and counter-current flow.

[0071] When the circulating water flows in the forward direction, the upper outlet of the first three-way solenoid valve 10 is open and the lower outlet is closed, allowing the circulating water to enter the upper inlet of the water purification filter 11. At the same time, the upper inlet of the second three-way solenoid valve 12 is closed and the lower inlet is open, allowing the purified circulating water to flow out from the lower outlet on the outlet side. When the circulating water flows in the reverse direction, the lower outlet of the first three-way solenoid valve 10 is open, allowing the circulating water to enter the lower inlet of the water purification filter 11. At the same time, the lower inlet of the second three-way solenoid valve 12 is closed and the upper inlet is open, allowing the purified circulating water to flow out from the upper outlet on the outlet side.

[0072] After passing through the water purification filter 11 and undergoing ion exchange, the circulating water enters the resin trap 13 via the second three-way solenoid valve 12. The resin trap 13 is used to capture resin residue in the circulating water, preventing resin from entering the electrolytic cell and causing damage. After passing through the resin trap 13, the circulating water enters the mixing tank 15 through the ball valve 14.

[0073] Under the control of the second diaphragm regulating valve 16, the circulating water in the high-temperature pipeline enters the second heat exchanger 18 at a certain flow rate. After heat exchange, it passes through the flow meter 19 and ball valve 20 into the mixing tank 15. The high-temperature circulating water in the mixing tank mixes with the circulating water in the low-temperature pipeline, maintaining a certain water temperature. The second bypass shut-off valve 17 is connected in parallel with the second diaphragm regulating valve 16. If the second diaphragm regulating valve 16 fails, operation can continue by opening the second bypass shut-off valve 17. The second diaphragm regulating valve 16 can be pneumatic or electric.

[0074] Solenoid valves and bypass valves for the first heat exchanger 8 and the second heat exchanger 18 are respectively installed on the cooling water inlet pipe to control the cooling water usage. Cooling water enters the first heat exchanger 8 through the first solenoid valve 22. The first solenoid valve 22, based on calculations by the rectifier control center 35, controls the cooling water flow to maintain the temperature of the circulating water in the low-temperature pipeline. If the first solenoid valve 22 malfunctions, the first bypass ball valve 21 is opened for manual control to maintain the temperature of the circulating water in the low-temperature pipeline.

[0075] Cooling water enters the second heat exchanger 18 through the second solenoid valve 24. The second solenoid valve 24, based on calculations by the rectifier control center 35, controls the cooling water flow to maintain the temperature of the circulating water in the high-temperature pipeline. If the second solenoid valve 24 malfunctions, the second bypass ball valve 23 is opened for manual control to maintain the temperature of the circulating water in the low-temperature pipeline.

[0076] Implementation Method 2

[0077] This invention also provides a control method for a high-temperature resistant SPE water electrolysis system, which involves performing the following steps using any of the high-temperature resistant SPE water electrolysis systems described in Embodiment 1:

[0078] Based on the fact that the electrolyzer is in operation, the water temperature flowing out of the circulation pipeline, the water temperature after heat exchange in the low temperature pipeline, the water temperature after water purification and filtration, the water temperature after heat exchange in the high temperature pipeline, and the water temperature and water quality flowing into the electrolyzer are monitored in real time.

[0079] The control subsystem generates control commands based on the monitored information to control the operating parameters of relevant equipment in each pipeline so as to send circulating water with the required temperature into the electrolytic cell for electrolysis.

[0080] The circulating water fed into the electrolytic cell should ensure that both the water temperature and water quality meet the preset requirements.

[0081] The control method of this invention utilizes set detection instruments, including those for temperature and water conductivity, to transmit monitoring information to the rectifier control center in real time, thereby achieving automatic control of temperature and water quality. This maximizes the equipment's operating temperature while ensuring water quality, thus improving the equipment's operating efficiency.

[0082] Specifically, its control principle is as follows:

[0083] A first temperature detection device 27 is installed at the outlet of the circulating pump to detect the temperature of the circulating water at the outlet of the electrolyzer. A second temperature detection device 28 is installed at the outlet of the first heat exchanger 8 to detect the temperature of the low-temperature circulating water after heat exchange. A third temperature detection device 29 is installed after the second three-way solenoid valve 12 to detect the temperature of the low-temperature circulating water after water purification (i.e., the temperature of the circulating water before entering the mixing tank 15). A fourth temperature detection device 30 is installed after the mixing tank 15 to detect the temperature of the high-temperature circulating water and the low-temperature circulating water after mixing. A fifth temperature detection device 31 is installed after the second flow meter 19 of the high-temperature pipeline to detect the temperature of the high-temperature circulating water after heat exchange and cooling, i.e., the temperature before entering the mixing tank.

[0084] A second water quality detection device 33 is installed before the resin trap 13 to detect the water quality of the circulating water after water purification in the low-temperature pipeline (i.e., the circulating water quality before entering the mixing tank 15). A third water quality detection device 34 is installed after the ball valve 20 in the high-temperature pipeline to detect the circulating water in the high-temperature pipeline (i.e., the water quality before entering the mixing tank 15). A first water quality detection device 32 is installed after the mixing tank 15 to detect the circulating water quality after the mixing tank (i.e., before entering the electrolyzer).

[0085] The temperature detection device and water quality detection device transmit temperature signals from different parts to the rectifier control center. The rectifier control center uses the water temperature signal and water quality signal to control the opening degree of the first diaphragm regulating valve 6, the second diaphragm regulating valve 16, the first solenoid valve 22, and the second solenoid valve 24 to ensure the stable and safe operation of the system.

[0086] The fourth temperature detection device 30 transmits the temperature signal of the circulating water at the outlet of the mixing tank to the rectifier control center. When the temperature of the circulating water at the inlet of the electrolytic cell exceeds the rated value, the rectifier control center analyzes and calculates to control the cooling effect of the high-temperature pipeline heat exchanger, increases the opening of the second solenoid valve 24, reduces the temperature of the high-temperature circulating water, and thus reduces the temperature of the circulating water after the mixing tank.

[0087] The first water quality detection device 32 transmits the temperature signal of the circulating water at the mixing tank outlet to the rectification control center. When the water quality is substandard, the opening of the first diaphragm regulating valve 6 is increased, allowing more circulating water to pass through the water purification filter for purification, thus increasing the amount of better-quality water in the low-temperature pipeline. Simultaneously, the opening of the second diaphragm regulating valve 16 is reduced to decrease the flow rate of water in the high-temperature pipeline, thereby improving the water quality in the mixing tank. While adjusting the first and second diaphragm regulating valves, the opening of the first solenoid valve 22 is increased, and the opening of the second solenoid valve 24 is reduced to maintain the water temperature in both pipelines, thereby maintaining the water quality and temperature after the mixing tank.

[0088] Those skilled in the art should understand that the control method in this invention has at least the same beneficial effects as the system in Embodiment 1, and will not be described in detail here.

[0089] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-temperature resistant SPE water electrolysis system, characterized in that, include: The electrolytic cell has one inlet and two outlets. A hydrogen pipeline is connected to one outlet end of the electrolyzer, and a ball valve, a hydrogen separator, and a hydrogen-side outlet valve are sequentially connected in the hydrogen pipeline along the direction of hydrogen flow. An oxygen pipeline is connected to another outlet end of the electrolyzer, and a ball valve, an oxygen separator, and an oxygen-side outlet valve are sequentially connected in the oxygen pipeline along the direction of oxygen flow. The circulation pipeline has its inlet end connected to the hydrogen separator and the oxygen separator respectively to collect circulating water. The outlet of the circulation pipeline is connected in parallel to a high-temperature pipeline and a low-temperature pipeline so that the circulating water flowing into it can be heat-exchanged by the cooling water pipeline. A water purification filter is connected to the low-temperature pipeline. The mixing tank has two input terminals connected to the high-temperature pipeline and the low-temperature pipeline, respectively, and an output terminal connected to the inlet of the electrolytic cell. The control subsystem can monitor in real time the water temperature flowing out of the circulation pipeline, the water temperature and quality after heat exchange in the low-temperature pipeline, the water temperature and quality after water purification and filtration, the water temperature and quality after heat exchange in the high-temperature pipeline, and the water temperature and quality flowing into the electrolytic cell. Based on the monitoring information, it controls the operating parameters of the relevant equipment to send the circulating water with the required temperature into the electrolytic cell. The control subsystem includes a rectifier control center and a first temperature detection device, a second temperature detection device, a third temperature detection device, a fourth temperature detection device, a fifth temperature detection device, a first water quality detection device, a second water quality detection device, and a third water quality detection device electrically connected to the rectifier control center. The first temperature detection device is used to monitor the water temperature flowing out of the circulation pipeline, the second temperature detection device is used to monitor the water temperature after heat exchange in the low-temperature pipeline, the third temperature detection device is used to monitor the water temperature after water purification and filtration in the low-temperature pipeline, the fourth temperature detection device is used to monitor the water temperature flowing into the electrolytic cell, and the fifth temperature detection device is used to monitor the water temperature after heat exchange in the high-temperature pipeline. The first water quality detection device is used to monitor the water quality flowing into the electrolytic cell, the second water quality detection device is used to monitor the water quality in the low-temperature pipeline after water purification and filtration, and the third water quality detection device is used to monitor the water quality in the high-temperature pipeline after heat exchange. The low-temperature pipeline is sequentially connected along the water flow direction to a first valve group, a first heat exchanger, a second temperature detection device, a flow meter, a first three-way solenoid valve, a water purification filter, a second three-way solenoid valve, the third temperature detection device, the second water quality detection device, a resin trap, and a ball valve. The first valve group includes a first diaphragm regulating valve and a first bypass shut-off valve connected in parallel to the low-temperature pipeline to keep the low-temperature pipeline unobstructed in the event of a failure of the first diaphragm regulating valve or the first bypass shut-off valve; the first three-way solenoid valve is connected to the two input terminals of the water purification filter, and the second three-way solenoid valve is connected to the two output terminals of the water purification filter. The rectifier control center is electrically connected to the first diaphragm regulating valve, the first three-way solenoid valve, and the second three-way solenoid valve respectively, so as to be able to respond to control commands from the rectifier control center; The high-temperature pipeline is sequentially connected to the second valve group, the second heat exchanger, the flow meter, the fifth temperature detection device, the ball valve, and the third water quality detection device along the water flow direction. The second valve group includes a second diaphragm regulating valve and a second bypass shut-off valve connected in parallel to the high-temperature pipeline to keep the high-temperature pipeline unobstructed in the event of a failure of the second diaphragm regulating valve or the second bypass shut-off valve. The rectifier control center is electrically connected to the second diaphragm regulating valve to respond to control commands from the rectifier control center.

2. The high-temperature resistant SPE electrolysis water system according to claim 1, characterized in that, The circulation pipeline is connected in sequence along the water flow direction to a ball valve, a circulation pump, and the first temperature detection device. The ball valve can cut off or open the pipeline through which circulating water enters the circulation pump.

3. The high-temperature resistant SPE electrolysis water system according to claim 2, characterized in that, The first water quality detection device and the fourth temperature detection device are sequentially connected in the pipeline connecting the mixing tank and the electrolytic cell along the water flow direction.

4. The high-temperature resistant SPE electrolysis water system according to claim 3, characterized in that, The cooling water pipeline includes: A cooling water inlet pipe has two inlet branch pipes connected in parallel to supply cooling water to the first heat exchanger and the second heat exchanger respectively. The cooling water outlet pipe has two inlet branch pipes connected in parallel to receive cooling water that has undergone heat exchange from the first heat exchanger and the second heat exchanger, respectively. Each of the inlet branch pipes is equipped with a bypass ball valve and a solenoid valve connected in parallel to maintain the unobstructed flow of the inlet branch pipe in the event of a malfunction of the bypass ball valve or the solenoid valve. The solenoid valve is electrically connected to the rectifier control center to respond to control commands from the rectifier control center.

5. The high-temperature resistant SPE electrolysis water system according to claim 4, characterized in that, When the circulating water in the water purification filter is in the first flow direction, the rectifier control center can control the first output port of the first three-way solenoid valve and the first input port of the second three-way solenoid valve to connect. When the circulating water in the water purification filter is in the second flow direction, the rectifier control center can control the connection between the second output port of the first three-way solenoid valve and the second input port of the second three-way solenoid valve.

6. The high-temperature resistant SPE electrolysis water system according to claim 4, characterized in that, The electrolytic cell has a drain valve; the water purification filter has an exhaust valve.

7. The high-temperature resistant SPE electrolysis water system according to claim 4, characterized in that, The electrolytic cell is equipped with a drain valve.

8. The high-temperature resistant SPE electrolysis water system according to claim 4, characterized in that, The water purification filter has an exhaust valve.

9. A control method for a high-temperature resistant SPE water electrolysis system, characterized in that, Perform the following steps using the high-temperature resistant SPE water electrolysis system according to any one of claims 1 to 8: While the electrolyzer is in operation, the water temperature flowing out of the circulation pipeline, the water temperature and quality after heat exchange in the low-temperature pipeline, the water temperature and quality after water purification and filtration, the water temperature and quality after heat exchange in the high-temperature pipeline, and the water temperature and quality flowing into the electrolyzer are monitored in real time. The control subsystem generates control commands based on the monitored information to control the operating parameters of relevant equipment in each pipeline so as to send circulating water with the required temperature into the electrolytic cell for electrolysis. The circulating water fed into the electrolytic cell should ensure that both the water temperature and water quality meet the preset requirements.

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