Water electrolysis hydrogen production system and process capable of carrying out condensate lossless recovery

Abstract

The invention belongs to the technical field of condensate recovery, and particularly relates to a water electrolysis hydrogen production system and process capable of carrying out condensate nondestructive recovery. A water electrolysis hydrogen production system capable of carrying out condensate lossless recovery is characterized in that an oxygen side condensate collector and a hydrogen side condensate collecting tank are arranged, an added hydrogen side and oxygen side condensate recovery process is associated with a hydrogen production system process, and the recovered condensate finally flows back to an electrolytic bath through an alkali liquor process pipeline to participate in an electrolytic reaction; the hydrogen cooler condenser pipe and the oxygen cooler condenser pipe introduce the formed condensate into the gas-liquid separators connected with the hydrogen cooler condenser pipe and the oxygen cooler condenser pipe respectively, and the condensate flows back to the electrolytic bath through the alkali liquor process pipeline to participate in the electrolytic reaction, so that water-removed oxygen and water-removed hydrogen are obtained respectively, the condensate is effectively recycled, and the cyclic utilization of the alkali liquor is realized; the waste of water resources is reduced, the production cost is further reduced, and the overall environmental protection property of the system is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of condensate recovery, and in particular relates to a water electrolysis hydrogen production system and process capable of lossless recovery of condensate. Background Art

[0002] At present, green hydrogen production technology mainly focuses on water electrolysis. In response to market requirements, water electrolysis equipment needs to be able to face multiple application scenarios. In addition to ensuring the safe and stable operation of hydrogen production equipment, it is also necessary to take into account environmental protection application characteristics, which puts higher requirements on the operation process of hydropower hydrogen production equipment. Nowadays, water electrolysis hydrogen production equipment on the market involves the treatment of liquid discharged at the end. If the liquid discharged at the end is not effectively treated, the discharge of these sewage will cause serious environmental pollution.

[0003] In the prior art, there are two main ways to deal with the liquid discharged from the end of the water electrolysis hydrogen production equipment during operation. One is to discharge the liquid discharged from the end of the water electrolysis hydrogen production equipment into the factory sewage network and centrally treat it in the sewage treatment system at the back end of the factory; the other is to collect the liquid discharged from the end of the water electrolysis hydrogen production equipment in a storage container and then pull it out of the factory for outsourcing. Both of the above methods will lead to the loss of pure water and alkali solution and the increase of subsequent processing costs. With the further expansion of the overall scale of water electrolysis hydrogen production equipment and layout, the loss of pure water and alkali solution and the subsequent processing costs will also increase further, becoming an industry issue that the market pays more and more attention to. Summary of the invention

[0004] The present invention provides a water electrolysis hydrogen production system capable of lossless recovery of condensate to solve the technical problems that the liquid discharged from the end of the existing water electrolysis hydrogen production equipment during operation causes environmental pollution and loss of pure water and alkali solution, and the treatment cost is high. The present invention also provides a water electrolysis hydrogen production process capable of lossless recovery of condensate to solve the above technical problems.

[0005] The technical solution of a water electrolysis hydrogen production system capable of lossless recovery of condensate provided by the present invention is: A water electrolysis hydrogen production system capable of lossless recovery of condensate comprises: an electrolyzer, an oxygen side recovery and separation subsystem, a hydrogen side recovery and separation subsystem and a control device; The oxygen side recovery subsystem includes an oxygen side drainer and an oxygen side condensate collector. The oxygen side drainer is connected to the oxygen side condensate collector through the oxygen side drainer condensate outlet pipe. The outlet end of the oxygen side condensate collector is connected to a water supply pump. The outlet end of the water supply pump is connected to a pipeline after the water supply pump. The pipeline after the water supply pump is connected to an oxygen side water supply pipeline. The oxygen side water supply pipeline is used to connect to an oxygen side gas scrubber. The hydrogen side recovery subsystem includes a hydrogen side drainer and a hydrogen side condensate collecting tank, the hydrogen side drainer is connected to the hydrogen side condensate collecting tank through the hydrogen side drainer condensate outlet pipe, the hydrogen side condensate collecting tank is connected to the condensate pump through the hydrogen side condensate collecting tank liquid outlet pipeline, the condensate pump outlet end is connected to the condensate pump rear pipeline, the condensate pump rear pipeline is connected to the hydrogen side water supply pipeline, and the hydrogen side water supply pipeline is connected to the hydrogen side gas scrubber; The oxygen-side gas scrubber and the hydrogen-side gas scrubber are used for washing oxygen and hydrogen produced by the electrolyzer respectively; the control device is used for controlling the water feed pump and the condensate pump.

[0006] The beneficial effects are as follows: the lossless recovery process of hydrogen-side condensed water starts from the hydrogen-side drainer and ends at the hydrogen-side gas scrubber, and the hydrogen-side condensate is discharged from the hydrogen-side drainer, which effectively realizes the smooth reflux of the hydrogen-side condensate; the lossless recovery process of oxygen-side condensed water mainly starts from the oxygen-side drainer and ends at the oxygen scrubber, and the condensate is discharged from the oxygen-side drainer, which effectively realizes the smooth reflux of the oxygen-side condensate. In view of the different physical and chemical properties of oxygen and hydrogen, different condensate recovery methods are used for oxygen and hydrogen in the gas-liquid separation process, which effectively realizes the recovery and reuse of the condensate formed in the gas-liquid separation process of oxygen and hydrogen.

[0007] Furthermore, the oxygen side gas scrubber and the hydrogen side gas scrubber are respectively used to separate the alkali liquid in the oxygen and hydrogen passing through the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator, and the separated alkali liquid is respectively returned to the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator through the oxygen side gas scrubber overflow pipe and the hydrogen side gas scrubber overflow pipe. The water electrolysis hydrogen production system also includes a gas-liquid separator balance pipe, which is used to connect the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator. The oxygen side gas-liquid separator and the hydrogen side gas-liquid separator are respectively connected to the oxygen outlet end and the hydrogen outlet end of the electrolyzer, and both return the alkali liquid to the electrolyzer through the alkali liquid process circulation pipe.

[0008] The beneficial effects are as follows: the alkali solution is returned to the electrolyzer through the liquid process circulation pipeline, so that the alkali solution is recycled, and the liquid discharged at the end of the water electrolyte hydrogen system will not cause environmental pollution and the loss of pure water and alkali solution, which is helpful to reduce the production cost and improve the overall environmental protection of the system. The oxygen side gas-liquid separator and the hydrogen side gas-liquid separator are connected through the gas-liquid separation balance pipe. After the condensate is recovered, the liquid level of the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator can still be balanced to achieve dynamic balance of the liquid level, reduce the pressure fluctuation on both sides of hydrogen and oxygen, thereby improving the purity of the product gas, which can meet the lossless recovery of the condensate, and does not affect the effective operation of the original process, ensuring the stable operation of the system. By setting the oxygen cooler condenser and the hydrogen cooler condenser, the primary oxygen side condensate and the primary hydrogen side condensate obtained by the oxygen cooler and the hydrogen cooler can be returned to the electrolyzer through the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator respectively, thereby effectively recovering the condensate, reducing the waste of water resources, and helping to further reduce the production cost and improve the overall environmental protection of the system.

[0009] Furthermore, the water electrolysis hydrogen production system also includes an oxygen side gas-water separator, which is used to separate the water in the condensed oxygen, and the oxygen side gas-water separator is connected to the oxygen side drainer through the oxygen side gas-water separator condenser pipe; the oxygen side gas-water separator condenser pipe and the oxygen side drainer condensate outlet pipe are respectively provided with valves V1 and valve V3 controlled by the control device; valves V1 and V3 are both opened at a fixed time and only one is opened at the same time, and an oxygen vent is provided on the oxygen side condensate collector; The water electrolysis hydrogen production system also includes a hydrogen side gas-water separator, which is used to separate water from the condensed hydrogen; the hydrogen side gas-water separator is connected to the hydrogen side drainer through the hydrogen side gas-water separator condenser; the hydrogen side gas-water separator condenser and the hydrogen side drainer condensate outlet pipe are respectively provided with valves V2 and valve V4; valves V2 and valves V4 are both opened at a fixed time and only one can be opened at the same time, the hydrogen side gas-water separator is used to connect to the hydrogen collection system, and the hydrogen side condensate collecting tank is provided with a hydrogen vent.

[0010] The beneficial effect is that the final oxygen side condensed water separated by the oxygen side gas-water separator is lifted by the water supply pump through the oxygen side drainer and the oxygen side condensate collector, refluxed to the oxygen side gas scrubber, then enters the oxygen side gas-liquid separator, and finally refluxed to the electrolyzer, realizing the lossless recovery of the condensate, further reducing the production cost and improving the overall environmental protection of the system. In addition, the oxygen vent on the oxygen side condensate collector can timely discharge the remaining small amount of oxygen, improving the safety of the system. The final hydrogen side condensed water separated by the hydrogen side gas-water separator is lifted by the condensate pump through the hydrogen side drainer and the hydrogen side water collector, refluxed to the hydrogen side gas scrubber, then enters the hydrogen side gas-liquid separator, and finally refluxed to the electrolyzer, realizing the lossless recovery of the condensate, reducing the consumption of pure water, further reducing the production cost and improving the overall environmental protection of the system. In addition, the hydrogen vent on the hydrogen side condensate collector can timely discharge the remaining small amount of hydrogen, improving the safety of the system.

[0011] Furthermore, it also includes a water make-up tank, the oxygen side condensate collector is connected to the water make-up pump through the oxygen side condensate collector condenser tube, one end of the oxygen side condensate collector condenser tube is arranged at the bottom of the oxygen side condensate collector, it is a U-shaped tube structure, and the bottom end is lower than the bottom of the water make-up tank, the water make-up tank is connected to the oxygen side condensate collector condenser tube through the water make-up tank outlet pipe, the interface between the water make-up tank outlet pipe and the oxygen side condensate collector condenser tube is arranged in front of the water make-up pump, and the water make-up tank outlet pipe is arranged horizontally.

[0012] The beneficial effect is that the water supply tank can store water to ensure that the water electrolysis hydrogen production system can be replenished with water in time when needed. The U-shaped tube structure and specific position setting of the condenser tube of the oxygen side condensate collector can utilize the liquid level difference to achieve the smooth flow of the condensate and improve the stability of the system.

[0013] Furthermore, the pipeline after the water supply pump is connected to the oxygen side water supply pipeline and the hydrogen side water supply pipeline, a valve V5 is provided on the oxygen side water supply pipeline, a valve V6 is provided on the hydrogen side water supply pipeline, and the control device is used to control the valve V5 and the valve V6.

[0014] Beneficial effects: It can ensure the separation of oxygen side reflux and hydrogen side reflux, avoid mixing of oxygen side reflux and hydrogen side reflux, prevent mixing of hydrogen and oxygen on hydrogen side and oxygen side, ensure the safe operation of the whole system, and at the same time, through the control of water supply pump and valve opening and closing, it can also replenish water when the whole system is short of water. Valve V5 can control the opening and closing of oxygen side water supply pipeline, which is convenient for system operation and maintenance.

[0015] The technical solution of a water electrolysis hydrogen production process capable of lossless recovery of condensate provided by the present invention is: A water electrolysis hydrogen production process capable of lossless recovery of condensate, comprising an oxygen side recovery process and a hydrogen side recovery process; The oxygen side recovery process includes: controlling the valve V3 to be opened, the final oxygen side condensate water enters the oxygen side condensate liquid collector from the oxygen side drainer, and after a small amount of oxygen in the final oxygen side condensate water is separated, controlling the water supply pump to be opened, and the final oxygen side condensate water flows back from the oxygen side condensate liquid collector to the oxygen side gas scrubber; The hydrogen side recovery process includes: controlling the valve V4 to be opened, the last stage hydrogen side condensate water enters the hydrogen side condensate collecting tank from the hydrogen side drainer, and after a small amount of hydrogen in the last stage hydrogen side condensate water is separated, controlling the condensate pump to be opened, and the last stage hydrogen side condensate water flows back from the hydrogen side condensate collecting tank to the hydrogen side gas scrubber; The oxygen-side gas scrubber and the hydrogen-side gas scrubber are used for oxygen-alkali separation and hydrogen-alkali separation of oxygen and hydrogen produced by the electrolyzer, respectively.

[0016] The beneficial effects are as follows: the lossless recovery process of hydrogen-side condensed water starts from the hydrogen-side drainer and ends at the hydrogen-side gas scrubber, and the hydrogen-side drainer is discharged, which effectively realizes the smooth reflux of hydrogen-side condensate; the lossless recovery process of oxygen-side condensed water mainly starts from the oxygen-side drainer and ends at the oxygen scrubber. The process description is that the condensate is discharged from the oxygen-side drainer and effectively realizes the smooth reflux of oxygen-side condensate. In view of the different physical and chemical properties of oxygen and hydrogen, different condensate recovery methods are used for oxygen and hydrogen in the gas-liquid separation process, which effectively realizes the recovery and reuse of condensate formed in the gas-liquid separation process of oxygen and hydrogen.

[0017] Furthermore, the oxygen side recovery process also includes: the alkaline oxygen discharged from the electrolyzer enters the oxygen side gas-liquid separator for primary oxygen-alkali separation, the obtained alkaline solution is returned to the electrolyzer, the obtained primary alkaline oxygen enters the oxygen side gas scrubber for further oxygen-alkali separation, the alkaline solution obtained by water washing is returned to the oxygen side gas-liquid separator and then returned to the electrolyzer, the obtained water-saturated oxygen enters the oxygen cooler, is cooled and dehydrated to obtain primary dehydrated oxygen and primary oxygen side condensed water, the primary oxygen side condensed water is returned to the oxygen side gas-liquid separator and then returned to the electrolyzer. electrolytic cell; the hydrogen side recovery process also includes the alkaline hydrogen discharged from the electrolytic cell, which enters the hydrogen side gas-liquid separator for initial hydrogen-alkali separation, the obtained alkaline solution is refluxed to the electrolytic cell, the obtained primary alkaline hydrogen enters the hydrogen side gas scrubber for further hydrogen-alkali separation, the obtained alkaline solution is refluxed to the hydrogen side gas-liquid separator and then refluxed to the electrolytic cell, the obtained saturated water hydrogen enters the hydrogen cooler, is cooled and dehydrated to obtain primary dehydrated hydrogen and primary hydrogen side condensed water, the primary hydrogen side condensed water is refluxed to the hydrogen side gas-liquid separator and then refluxed to the electrolytic cell.

[0018] The beneficial effects are: in the oxygen side recovery, the primary dehydrated oxygen is further separated from water and gas, which improves the purity and quality of oxygen, and through the reflux of condensate, the waste of water resources is reduced, and the economy and environmental protection of the hydrogen production system are improved. In addition, the opening of valves V1 and V3 is controlled at a time to ensure the orderly flow and recovery of condensate, avoiding system confusion and failure. The oxygen vent discharges a small amount of oxygen in the condensed water to prevent it from flowing back into the electrolyzer, ensuring the safe operation of the water electrolysis hydrogen production system.

[0019] Further, the primary dehydrated oxygen obtained by cooling and dehydration enters the oxygen side gas-water separator, and the water is further removed to obtain the final dehydrated oxygen and the final oxygen side condensed water. The final dehydrated oxygen is introduced into the oxygen collection system, the valve V3 is closed, the valve V1 is opened, the final oxygen side condensed water enters the oxygen side drainer, the valve V1 is closed, the valve V3 is opened, the final oxygen side condensed water enters the oxygen side condensate collector to separate a small amount of oxygen therein and discharge the oxygen, and then it is lifted by the water supply pump and refluxed to the oxygen side gas scrubber; the hydrogen side The recovery process also includes cooling and removing water to obtain primary dehydrated hydrogen, which enters the hydrogen side gas-water separator to obtain final dehydrated hydrogen and final hydrogen side condensed water, the final dehydrated hydrogen is introduced into the hydrogen collection system, valve V4 is closed, valve V2 is opened, the final hydrogen side condensed water enters the hydrogen side drainer, valve V2 is closed, valve V4 is opened, the final hydrogen side condensed water enters the hydrogen side condensate collecting tank, a small amount of hydrogen gas therein is separated and the hydrogen is vented, and then it is lifted by a condensate pump and refluxed to the hydrogen side gas scrubber.

[0020] The beneficial effects are: in the hydrogen side recovery, the primary dehydrated hydrogen is further separated from water and gas, which improves the purity and quality of hydrogen, and through the reflux of condensate, water resource waste is reduced, pure water consumption is reduced, and the economy and environmental protection of the hydrogen production system are improved. The timing control of valves V2 and V4 opens and closes to ensure the orderly flow and recovery of condensate. The hydrogen vent discharges a small amount of hydrogen in the condensed water to avoid reflux into the electrolyzer, ensuring the safe operation of the water electrolysis hydrogen production system and improving the safety of the system.

[0021] Furthermore, a make-up water tank is connected in front of the make-up water pump. When the liquid level in the make-up water tank is low, the high-level condensate in the oxygen side condensate collector is pressed into the make-up water tank through the condensation pipe of the oxygen side condensate collector and the make-up water tank outlet pipe in sequence. When the liquid level in the make-up water tank is high, the high-level water in the make-up water tank is pressed into the oxygen side condensate collector through the condensation pipe of the make-up water tank outlet pipe and the oxygen side condensate collector condensation pipe in sequence. When the make-up water pump is turned on, water and condensate are driven from the oxygen side condensate collector and the make-up water tank to flow to the oxygen side gas scrubber at the same time.

[0022] The beneficial effects are: through the water make-up tank, when the water electrolysis hydrogen production system lacks water, the system can be replenished with water to ensure the smooth process of water electrolysis hydrogen production, and control the liquid level balance in the oxygen side condensate collector and the water make-up tank. When the water make-up pump is turned on, water and condensate are driven from the oxygen side condensate collector and the water make-up tank to the oxygen side gas scrubber at the same time, ensuring a stable water supply for the water washing process and improving the reliability of the system.

[0023] Furthermore, when only the hydrogen side of the electrolyzer needs water replenishment, start the water replenishment pump, open the valve V6 on the hydrogen side water replenishment pipeline, and close the valve V5 on the oxygen side water replenishment pipeline; when only the oxygen side of the electrolyzer needs water replenishment, open the valve V5 and close the valve V6.

[0024] The beneficial effects are: it can ensure the separation of oxygen side reflux and hydrogen side reflux, avoid mixing of oxygen side reflux and hydrogen side reflux, prevent mixing of hydrogen and oxygen on the hydrogen side and oxygen side, ensure the safe operation of the whole system, and at the same time, through the control of the water supply pump and the opening and closing of the valve, the system can be replenished with water when the whole system is short of water. Valve V5 can control the opening and closing of the oxygen side water supply pipeline, which is convenient for the operation and maintenance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the lossless recovery process of condensate in the water electrolysis hydrogen production system of Example 1 provided by the present invention; Figure 2 This is a simplified process diagram of the oxygen side of the condensate lossless recovery of the water electrolysis hydrogen production system of Example 1 provided by the present invention; Figure 3 This is a simplified process diagram of the condensate lossless hydrogen recovery side of the water electrolysis hydrogen production system of Example 1 provided by the present invention; 1. Electrolyzer; 2. Oxygen-alkali mixture inlet pipe; 3. Hydrogen-alkali mixture inlet pipe; 4. Gas-liquid separator balance pipe; 5. Alkali liquid process circulation pipe; 6. Oxygen side gas-liquid separator; 7. Hydrogen side gas-liquid separator; 8. Oxygen side gas scrubber overflow pipe; 9. Hydrogen side gas scrubber overflow pipe; 10. Oxygen cooler condenser; 11. Hydrogen cooler condenser; 12. Oxygen side gas scrubber; 13. Hydrogen side gas scrubber; 14. Oxygen cooler; 15. Hydrogen cooler; 16. Oxygen side gas-water separator; 17. Hydrogen side gas-water separator; 18. Oxygen side gas-water separator condenser tube; 19. condenser tube of gas-water separator on hydrogen side; 20. drainer on oxygen side; 21. drainer on hydrogen side; 22. condensate outlet pipe of drainer on oxygen side; 23. condensate outlet pipe of drainer on hydrogen side; 24. condensate collector on oxygen side; 25. condensate collecting tank on hydrogen side; 26. condensate collector tube of condensate collecting tank on oxygen side; 27. outlet pipe of make-up water tank; 28. make-up water tank; 29. ​​make-up water pump; 30. pipe after make-up water pump; 31. make-up water pipe on oxygen side; 32. make-up water pipe on hydrogen side; 33. outlet pipe of condensate collecting tank on hydrogen side; 34. condensate pump; 35. pipe after condensate pump. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings.

[0027] Specific embodiment 1 of a water electrolysis hydrogen production system capable of lossless recovery of condensate provided by the present invention: This embodiment provides a water electrolysis hydrogen production system capable of lossless recovery of condensate, such as Figure 1 , including an electrolyzer 1, an oxygen side recovery subsystem, a hydrogen side recovery subsystem and a control device. In this embodiment, the control device is a PLC module. By controlling the condensate pump and the valve through the PLC, the automation level of the system can be improved, and the effective control of the entire system can be accurately and reliably achieved, thereby ensuring the accuracy and reliability of the system operation.

[0028] The oxygen side recovery subsystem includes an oxygen side drainer 20 and an oxygen side condensate collector 24. The oxygen side drainer 20 is connected to the oxygen side condensate collector 24 through an oxygen side drainer condensate outlet pipe 22. The outlet end of the oxygen side condensate collector 24 is connected to a water supply pump 29. The outlet end of the water supply pump 29 is connected to a pipe 30 after the water supply pump. The pipe 30 after the water supply pump is connected to an oxygen side water supply pipe 31. The oxygen side water supply pipe 31 is used to connect to the oxygen side gas scrubber 12. A valve V5 is provided on the oxygen side water supply pipe 31. The hydrogen side recovery subsystem includes a hydrogen side drainer 21 and a hydrogen side condensate collecting tank 25. The hydrogen side drainer 21 is connected to the hydrogen side condensate collecting tank 25 through the hydrogen side drainer condensate outlet pipe 23. The hydrogen side condensate collecting tank 25 is connected to the condensate pump 34 through the hydrogen side condensate collecting tank liquid outlet pipe 33. The outlet end of the condensate pump 34 is connected to the condensate pump rear pipe 35. The condensate pump rear pipe 35 is connected to the hydrogen side water replenishment pipe 32. The hydrogen side water replenishment pipe 32 is connected to the hydrogen side gas scrubber 13. A valve V6 is provided on the hydrogen side water replenishment pipe 32.

[0029] The oxygen-side gas scrubber 12 and the hydrogen-side gas scrubber 13 are used for washing the oxygen and hydrogen produced by the electrolytic cell 1 , respectively; the control device is used for controlling the water supply pump 29 and the condensate pump 34 .

[0030] like Figure 1 , the oxygen-side gas-liquid separator 6 and the hydrogen-side gas-liquid separator 7 are respectively connected to the oxygen outlet end and the hydrogen outlet end of the electrolyzer 1. In this embodiment, the electrolyzer 1 is provided with an oxygen-alkali mixture inlet pipe 2 and a hydrogen-alkali mixture inlet pipe 3, the oxygen-side gas-liquid separator 6 is connected to the oxygen outlet end of the electrolyzer 1 through the oxygen-alkali mixture inlet pipe 2, the hydrogen-side gas-liquid separator 7 is connected to the hydrogen outlet end of the electrolyzer 1 through the hydrogen-alkali mixture inlet pipe 3, the oxygen-side gas-liquid separator 6 and the hydrogen-side gas-liquid separator 7 are connected through a gas-liquid separator balance pipe 4, and the gas-liquid separator balance pipe 4 is used to balance the liquid level of the separators on both sides of hydrogen and oxygen through the balance pipe principle, so as to achieve dynamic balance of the liquid level of the separators on both sides of hydrogen and oxygen. The oxygen-side gas-liquid separator 6 and the hydrogen-side gas-liquid separator 7 both return the alkali liquid to the electrolytic cell 1 through the alkali liquid process circulation pipeline 5. The alkali liquid process circulation pipeline 5 includes an oxygen-side branch, a hydrogen-side branch and a main pipeline. The main pipeline is used to connect the electrolytic cell 1. The oxygen-side branch and the hydrogen-side branch are connected to the oxygen-side gas-liquid separator 6 and the hydrogen-side gas-liquid separator 7 respectively. The alkali liquid in the oxygen-side gas-liquid separator 6 and the hydrogen-side gas-liquid separator 7 returns to the electrolytic cell through the alkali liquid process circulation pipeline 5 to form an alkali liquid circulation.

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, the condensate lossless recovery system includes an oxygen side gas scrubber 12 and a hydrogen side gas scrubber 13, which are used to separate the alkali liquid in the oxygen and hydrogen passing through the oxygen side gas-liquid separator 6 and the hydrogen side gas-liquid separator 7, respectively, and reflux the separated alkali liquid to the oxygen side gas-liquid separator 6 and the hydrogen side gas-liquid separator 7 through the oxygen side gas scrubber overflow pipe 8 and the hydrogen side gas scrubber overflow pipe 9, respectively.

[0032] The water electrolysis hydrogen production system also includes a gas-liquid separator balance pipe 4, which is used to connect the oxygen-side gas-liquid separator 6 and the hydrogen-side gas-liquid separator 7. The oxygen-side gas-liquid separator 6 and the hydrogen-side gas-liquid separator 7 are respectively connected to the oxygen outlet end and the hydrogen outlet end of the electrolytic cell 1, and both return the alkali liquid to the electrolytic cell 1 through the alkali liquid process circulation pipeline 5.

[0033] The condensate lossless recovery system also includes an oxygen cooler 14 and a hydrogen cooler 15, which are respectively used to condense the saturated water-containing oxygen and saturated water-containing hydrogen after water washing. The oxygen cooler 14 and the hydrogen cooler 15 are respectively connected to the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator through the oxygen cooler condenser pipe 10 and the hydrogen cooler condenser pipe 11.

[0034] In this embodiment, Figure 1 , Figure 2 As shown, an alkali-containing oxygen outlet pipe is provided on the oxygen-side gas-liquid separator 6, and the alkali-containing oxygen outlet pipe is connected to the oxygen-side gas scrubber 12. The oxygen-side gas scrubber 12 is provided with an oxygen-side gas scrubber overflow pipe 8. The alkali liquid obtained by separating the alkali-containing liquid oxygen through the oxygen-side gas scrubber 12 is refluxed to the oxygen-side gas-liquid separator 6 with pure water through the oxygen-side gas scrubber overflow pipe 8. An oxygen-containing water outlet pipe is provided on the oxygen gas scrubber 12, and the water-containing oxygen outlet pipe is connected to the oxygen cooler 14. The oxygen cooler 14 is provided with an oxygen cooler condenser 10, and the oxygen cooler condenser 10 is connected to the oxygen-side gas-liquid separator 6. The saturated water-containing oxygen washed by the oxygen-side gas scrubber 12 enters the oxygen cooler 14 through the water-containing oxygen outlet pipe, and the saturated water-containing oxygen is cooled in the oxygen cooler 14. The condensate after cooling is refluxed to the oxygen-side gas-liquid separator 6 through the oxygen cooler condenser 10.

[0035] In this embodiment, the condensate lossless return system of the water electrolysis hydrogen production system also includes an oxygen side gas-water separator 16, which is used to further separate the water in the condensed oxygen. The oxygen cooler 14 is connected to the oxygen side gas-water separator 16 through the oxygen cooler condensate outlet pipe, and the oxygen side gas-water separator 16 is connected to the oxygen side drainer 20 through the oxygen side gas-water separator condenser 18. The oxygen side drainer 20 is connected to the oxygen side condensate collector 24 through the oxygen side drainer condensate outlet pipe 22; valves V1 and V3 are respectively provided on the oxygen side gas-water separator condenser 18 and the oxygen side drainer condensate outlet pipe 22; valves V1 and V3 are both opened regularly and only one is opened at the same time, the oxygen side condensate collector 24 is connected to the oxygen gas scrubber 12 through the water supply pump 29, and the oxygen side gas-water separator 16 is provided with an oxygen vent. The oxygen vent is used to discharge a small amount of oxygen in the condensate out of the system to ensure the stable operation of the system. The valves V1 and V3 in this embodiment are both solenoid valves.

[0036] The condensate lossless recovery system also includes a water make-up tank 28. The oxygen side condensate collector 24 is connected to a water make-up pump 29 through an oxygen side condensate collector condenser pipe 26. One end of the oxygen side condensate collector condenser pipe 26 is arranged at the bottom of the oxygen side condensate collector 24, which is a U-shaped pipe structure, and the bottom end is lower than the bottom of the water make-up tank 28. The water make-up tank 28 is connected to the oxygen side condensate collector condenser pipe 26 through a water make-up tank outlet pipe 27. The interface between the water make-up tank outlet pipe 27 and the oxygen side condensate collector condenser pipe 26 is arranged in front of the water make-up pump. The water make-up tank outlet pipe 27 is arranged horizontally. The outlet end of the water make-up pump is connected to the water make-up pump rear pipe 30. The water make-up pump rear pipe 30 is connected to the oxygen side water make-up pipe 31. The oxygen side water make-up pipe 31 is connected to the oxygen side gas scrubber 12. A valve V5 is provided on the oxygen side water make-up pipe 31. Open valve V1, and the condensate is transferred to the oxygen side drainer 20 through the oxygen side gas-water separator condenser pipe 18. Then close valve V1 and open valve V3, and the condensate is transferred to the oxygen side condensate collector 24 through the oxygen side drainer condensate outlet pipe 22. Both valves V1 and V3 are opened at regular intervals, and only one can be opened at the same time. Using the principle of the balance pipe, the high-level condensate in the oxygen side condensate collector 24 will be pressed into the make-up water tank 28 through the oxygen side condensate collector condenser pipe 26 and the make-up water tank outlet pipe 27 in turn, until the liquid level in the oxygen side condensate collector 24 is the same as that in the make-up water tank 28. A liquid check valve H1 is provided on the rear pipe 30 of the make-up water pump to prevent the liquid from flowing back to the make-up water pump.

[0037] During the gas-liquid separation process of the oxygen obtained by electrolysis in the electrolyzer, the separated liquid returns to the gas-liquid separator from the overflow port on the oxygen side gas scrubber 12, the condenser on the oxygen cooler 14, and the condenser on the oxygen side condensate collector 24 in sequence, and flows back to the electrolyzer 1 through the alkali liquid process circulation pipeline 5 for water electrolysis hydrogen production reaction, so that the condensate formed by the oxygen gas-liquid separation is recovered and reused step by step, thereby reducing the consumption of pure water and alkali liquid in the hydrogen production process, saving hydrogen production costs, and improving the economy and environmental protection of hydrogen production equipment.

[0038] In this embodiment, the condensate lossless return system of the water electrolysis hydrogen production system also includes a hydrogen side gas-water separator 17 for further separating the water in the condensed hydrogen. The hydrogen side gas-water separator 17 is connected to the hydrogen side drainer 21 through the hydrogen side gas-water separator condenser pipe 19, and the hydrogen side drainer 21 is connected to the hydrogen side condensate collecting tank 25 through the hydrogen side drainer condensate outlet pipe 23; valves V2 and valves V4 are respectively provided on the hydrogen side gas-water separator condenser pipe 19 and the hydrogen side drainer condensate outlet pipe 23; valves V2 and valves V4 are both opened at a fixed time and only one valve can be opened at the same time. The hydrogen side gas-water separator 17 is used to connect the hydrogen collection system. The hydrogen side condensate collecting tank 25 is provided with a hydrogen venting port. The hydrogen side condensate collecting tank 25 is connected to the condensate pump 34 through the hydrogen side condensate collecting tank liquid outlet pipe 33. The outlet end of the condensate pump 34 is connected to the condensate pump rear pipe 35. The condensate pump rear pipe 35 is connected to the hydrogen side water replenishment pipe 32. The hydrogen side water replenishment pipe 32 is connected to the hydrogen side gas scrubber 13. The hydrogen side water replenishment pipe 32 is provided with a valve V6. The condensate lossless recovery system also includes a PLC for controlling the condensate pump 34 and the valve V6. The hydrogen side condensate collecting tank 25 is provided with a liquid level sensor 36 for detecting the liquid level of the hydrogen side condensate collecting tank 25, and is interlocked with the condensate pump 34 and the valve V6 through the PLC module, so as to realize the automatic recovery of the hydrogen side condensate.

[0039] In this embodiment, Figure 1 , Figure 3 As shown, the hydrogen-side gas-liquid separator 7 is provided with an alkali-containing hydrogen outlet pipeline, which is connected to the hydrogen-side gas scrubber 13. The hydrogen-side gas scrubber 13 is provided with a hydrogen-side gas scrubber overflow pipeline 9. After the alkali-containing hydrogen is washed with water by the hydrogen-side gas scrubber 13, the alkali liquid returns to the hydrogen-side gas-liquid separator 7 with pure water through the hydrogen-side gas scrubber overflow pipeline 9 and is connected to the hydrogen cooler 15. The hydrogen cooler 15 is provided with a hydrogen cooler condenser 11, and the hydrogen cooler condenser 11 is connected to the hydrogen-side gas-liquid separator 7. The saturated water-containing hydrogen washed by the hydrogen-side gas scrubber 13 enters the hydrogen cooler 15 through the water-containing hydrogen outlet pipeline, the saturated water-containing hydrogen is cooled in the hydrogen cooler 15, and the condensate that has completed cooling flows back to the hydrogen-side gas-liquid separator 7 through the hydrogen cooler condenser 11.

[0040] In this embodiment, the condensate lossless return system of the water electrolysis hydrogen production system also includes a hydrogen side gas-water separator 17, which is used to further separate the water in the condensed hydrogen. The hydrogen side gas-water separator 17 is connected to the hydrogen side drainer 21 through the hydrogen side gas-water separator condenser pipe 19, and the hydrogen side drainer 21 is connected to the hydrogen side condensate collecting tank 25 through the hydrogen side drainer condensate outlet pipe 23; valves V2 and V4 are respectively provided on the hydrogen side gas-water separator condenser pipe 19 and the hydrogen side drainer condensate outlet pipe 23; valves V2 and V4 are both opened at a fixed time and only one can be opened at the same time, and the hydrogen side gas-water separator 17 is used to connect the hydrogen collection system, and the hydrogen side condensate The liquid collecting tank 25 is provided with a hydrogen venting port, the hydrogen side condensate collecting tank 25 is connected to the condensate pump 34 through the hydrogen side condensate collecting tank liquid outlet pipe 33, the outlet end of the condensate pump 34 is connected to the condensate pump rear pipe 35, the condensate pump rear pipe 35 is connected to the hydrogen side water replenishment pipe 32, the hydrogen side water replenishment pipe 32 is connected to the hydrogen side gas scrubber 13, the hydrogen side water replenishment pipe 32 is provided with a valve V6, and the condensate lossless recovery system also includes a PLC for controlling the condensate pump 34 and the valve V6. Open valve V2, transfer the condensate to the hydrogen side drainer 21 through the condensate hydrogen side gas-water separator condensate pipe 19, then close valve V2, open valve V4, and the condensate is transferred to the hydrogen side condensate collecting tank 25 through the hydrogen side drainer outlet pipe 23, wherein valve V2 and valve V4 are both opened at a fixed time and only one can be opened at the same time. A valve V7 and a Y-type filter Y1 are provided in sequence on the liquid outlet pipe 33 of the hydrogen side condensate collecting tank along the liquid flow direction, and a valve V8 and a liquid check valve H2 are provided in sequence on the pipe 35 after the condensate pump along the liquid flow direction.

[0041] Before starting the condensate pump 34 for the first time, open valves V7 and V8 in advance. When the condensate in the hydrogen side condensate collecting tank reaches the upper limit liquid level, the PLC controls to open valve V6 and then start the condensate pump 34. The condensate in the hydrogen side condensate collecting tank is driven by the condensate pump 34 to flow into the hydrogen side gas scrubber 13 through the condensate pump rear pipe 35 and the hydrogen side water supply pipe 32 in sequence, and then flows back to the hydrogen side gas-liquid separator 7 through the hydrogen side gas scrubber overflow pipe 9. For the hydrogen side process pipeline, during the gas-liquid separation process of hydrogen, the separated liquid returns to the hydrogen side gas-liquid separator 7 from the overflow port on the hydrogen side gas scrubber 13, the condenser on the hydrogen cooler 15, and the condenser on the hydrogen side condensate collecting tank 25 in turn, and finally flows back to the electrolytic cell 1 through the alkali liquid process circulation pipeline 5 for water electrolysis hydrogen production reaction, so as to realize the step-by-step recovery and reuse of the condensate formed by the gas-liquid separation of hydrogen, thereby reducing the consumption of pure water and alkali liquid in the hydrogen production process, saving hydrogen production costs, and improving the economy and environmental protection of hydrogen production equipment.

[0042] In this embodiment, the water supply pump rear pipeline 30 is connected to the oxygen side water supply pipeline 31 and the hydrogen side water supply pipeline 32, the oxygen side water supply pipeline 31 is provided with a valve V5, the hydrogen side water supply pipeline 32 is provided with a valve V6, and the control device is used to control the valve V5 and the valve V6. In other embodiments, the water supply pump rear pipeline can also be disconnected from the hydrogen side water supply pipeline, and the water supply pump alone only supplies water to the oxygen side recovery and separation subsystem. In this embodiment, valve V1, valve V2, valve V3, valve V4, valve V5 and valve V6 are all electromagnetic valves.

[0043] Specific embodiment 2 of a water electrolysis hydrogen production system capable of lossless recovery of condensate provided by the present invention: In this embodiment, no alkali solution process circulation pipeline is provided, that is, the recovered condensate is not returned to the electrolytic cell, and the recovered condensate is mainly used to remove the alkali solution in the hydrogen or oxygen by water washing or the like.

[0044] Specific embodiment 3 of a water electrolysis hydrogen production system capable of lossless recovery of condensate provided by the present invention: In this embodiment, two-stage oxygen-side gas scrubbers and hydrogen-side gas scrubbers are provided to separate and remove alkali liquid in oxygen and hydrogen multiple times, thereby improving the purity of oxygen and hydrogen. In other embodiments, three or four or more levels of oxygen-side gas scrubbers and hydrogen-side gas scrubbers may also be provided.

[0045] Specific embodiment 4 of a water electrolysis hydrogen production system capable of lossless recovery of condensate provided by the present invention: In this embodiment, no gas-liquid separator balance pipe is provided between the oxygen-side gas-liquid separator and the hydrogen-side gas-liquid separator.

[0046] Specific embodiment 5 of a water electrolysis hydrogen production system capable of lossless recovery of condensate provided by the present invention: In this embodiment, the oxygen side gas-water separator and the hydrogen side gas-water separator are provided in two stages to fully remove the water in the oxygen and hydrogen, thereby improving the purity of the oxygen and hydrogen. In other embodiments, three or four or more levels of oxygen side gas-water separators and hydrogen side gas-water separators may also be provided.

[0047] Specific embodiment 1 of a water electrolysis hydrogen production process capable of lossless recovery of condensate provided by the present invention: A water electrolysis hydrogen production process package capable of lossless recovery of condensate, comprising an oxygen side recovery process and a hydrogen side recovery process.

[0048] The oxygen side recovery process includes: the alkaline oxygen discharged from the electrolytic cell enters the oxygen side gas-liquid separator for primary oxygen-alkali separation, the obtained alkaline solution is refluxed to the electrolytic cell, the obtained oxygen side condensed water-containing alkaline oxygen enters the oxygen side gas scrubber for water washing, the alkaline solution obtained by water washing is refluxed to the oxygen side gas-liquid separator and then refluxed to the electrolytic cell, the obtained oxygen containing saturated water enters the oxygen cooler 14, is cooled and dehydrated to obtain primary dehydrated oxygen and primary oxygen side condensed water, the primary oxygen side condensed water is refluxed to the oxygen side gas-liquid separator and then refluxed to the electrolytic cell; The primary dehydrated oxygen obtained by cooling and dehydration enters the oxygen side gas-water separator 16 to obtain the final dehydrated oxygen and the final oxygen side condensed water. The final dehydrated oxygen is introduced into the oxygen collection system. The timing control valve V1 is opened, and the final oxygen side condensed water enters the oxygen side drainer 20. The timing control valve V3 is opened, and the final oxygen side condensed water enters the oxygen side condensate collector 24. After a small amount of oxygen in the final oxygen side condensed water is separated, it is lifted by the water supply pump 29 and refluxed to the oxygen side gas scrubber 12 for washing the alkaline oxygen contained in the final oxygen side condensed water. The small amount of oxygen separated from the final oxygen side condensed water is discharged. The control valve V1 and the valve V3 are not opened at the same time.

[0049] A water supply tank 28 is connected in front of the water supply pump. The control valve V1 and the valve V3 are not opened at the same time, and only one can be opened at the same time. Using the balance pipe principle, the high-level condensate in the oxygen-side condensate collector 24 is pressed into the water supply tank 28 through the oxygen-side condensate collector condensation pipe 26 and the water supply tank outlet pipe 27 in turn. When the liquid level in the water supply tank 28 is high, the high-level water in the water supply tank 28 is pressed into the oxygen-side condensate collector 24 through the water supply tank outlet pipe 27 and the oxygen-side condensate collector condensation pipe 26 in turn, so that the liquid level heights in the oxygen-side condensate collector 24 and the water supply tank 28 gradually become the same according to the balance pipe principle. When the water supply pump is turned on, water and condensate are driven from the oxygen-side condensate collector 24 and the water supply tank 28 to flow to the oxygen-side gas scrubber 12 at the same time.

[0050] The hydrogen side recovery process includes: the alkaline hydrogen discharged from the electrolyzer enters the hydrogen side gas-liquid separator for primary hydrogen-alkali separation, the obtained alkaline solution is refluxed to the electrolyzer, the final hydrogen side condensed water-containing alkaline hydrogen enters the hydrogen gas scrubber for water washing, the alkaline solution obtained by water washing is refluxed to the hydrogen gas-liquid separator and then refluxed to the electrolyzer, the obtained saturated water hydrogen enters the hydrogen cooler 15, is cooled and dehydrated to obtain primary dehydrated hydrogen and primary hydrogen side condensed water, and the condensed water is refluxed to the hydrogen side gas-liquid separator and then refluxed to the electrolyzer.

[0051] During the hydrogen side recovery, the primary dehydrated hydrogen is cooled and dehydrated to enter the hydrogen side gas-water separator 17, and the final hydrogen side condensed water dehydrated hydrogen and the final hydrogen side condensed water are obtained. The final hydrogen side condensed water dehydrated hydrogen is introduced into the hydrogen collection system, the timing control valve V2 is opened, the final hydrogen side condensed water enters the hydrogen side drainer 21, the timing control valve V4 is opened, the final hydrogen side condensed water enters the hydrogen side condensate collecting tank 25, and after separating a small amount of hydrogen gas in the final hydrogen side condensed water, it is lifted by the condensate pump 34 and refluxed to the hydrogen side gas scrubber 13 for washing the alkaline hydrogen gas in the final hydrogen side condensed water, and the small amount of hydrogen separated from the final hydrogen side condensed water is vented; the control valve V2 and the valve V4 are not opened at the same time. A liquid level sensor 36 is provided on the hydrogen side condensate collecting tank 25, which is used to detect the liquid level of the hydrogen side condensate collecting tank 25, and is interlocked with the condensate pump 34 and the valve V6 through the PLC module, so as to realize the automatic recovery of the hydrogen side condensate. The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0052] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0053] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

Claims

1. A water electrolysis hydrogen production system capable of lossless recovery of condensate, characterized in that: include: An electrolyzer (1), an oxygen side recovery and separation subsystem, a hydrogen side recovery and separation subsystem, and a control device; The oxygen side recovery subsystem comprises an oxygen side drainer (20) and an oxygen side condensate collector (24); the oxygen side drainer (20) is connected to the oxygen side condensate collector (24) via an oxygen side drainer condensate outlet pipe (22); the outlet end of the oxygen side condensate collector (24) is connected to a water supply pump (29); the outlet end of the water supply pump (29) is connected to a pipe (30) behind the water supply pump; the pipe (30) behind the water supply pump is connected to an oxygen side water supply pipe (31); and the oxygen side water supply pipe (31) is used to connect to an oxygen side gas scrubber (12); The hydrogen side recovery subsystem comprises a hydrogen side drainer (21) and a hydrogen side condensate collecting tank (25); the hydrogen side drainer (21) is connected to the hydrogen side condensate collecting tank (25) through a hydrogen side drainer condensate outlet pipe (23); the hydrogen side condensate collecting tank (25) is connected to a condensate pump (34) through a hydrogen side condensate collecting tank liquid outlet pipe (33); the outlet end of the condensate pump (34) is connected to a condensate pump rear pipe (35); the condensate pump rear pipe (35) is connected to a hydrogen side water replenishment pipe (32); and the hydrogen side water replenishment pipe (32) is connected to a hydrogen side gas scrubber (13); The oxygen-side gas scrubber (12) and the hydrogen-side gas scrubber (13) are used to wash the oxygen and hydrogen produced by the electrolytic cell (1) with water, respectively; the control device is used to control the water supply pump (29) and the condensate pump (34).

2. A water electrolysis hydrogen production system capable of lossless recovery of condensate according to claim 1, characterized in that: The oxygen-side gas scrubber (12) and the hydrogen-side gas scrubber (13) are respectively used to separate the alkali liquid in the oxygen and hydrogen that have passed through the oxygen-side gas-liquid separator (6) and the hydrogen-side gas-liquid separator (7), and to return the separated alkali liquid to the oxygen-side gas-liquid separator (6) and the hydrogen-side gas-liquid separator (7) through the oxygen-side gas scrubber overflow pipe (8) and the hydrogen-side gas scrubber overflow pipe (9), respectively. The water electrolysis hydrogen production system also includes a gas-liquid separator balance pipe (4) for connecting the oxygen-side gas-liquid separator (6) and the hydrogen-side gas-liquid separator (7). The oxygen-side gas-liquid separator (6) and the hydrogen-side gas-liquid separator (7) are respectively connected to the oxygen outlet end and the hydrogen outlet end of the electrolytic cell (1), and both return the alkali liquid to the electrolytic cell (1) through the alkali liquid process circulation pipe (5).

3. A water electrolysis hydrogen production system capable of lossless recovery of condensate according to claim 2, characterized in that: The water electrolysis hydrogen production system also includes an oxygen-side gas-water separator (16) for separating water from condensed oxygen. The oxygen-side gas-water separator (16) is connected to the oxygen-side drainer (20) via an oxygen-side gas-water separator condenser pipe (18). A valve V1 and a valve V3 controlled by a control device are respectively provided on the oxygen-side gas-water separator condenser pipe (18) and the oxygen-side drainer condensate outlet pipe (22). Both valves V1 and V3 are opened at a fixed time and only one is opened at the same time. An oxygen vent is provided on the oxygen-side condensate collector (24). The water electrolysis hydrogen production system further comprises a hydrogen side gas-water separator (17) for separating water from condensed hydrogen; the hydrogen side gas-water separator (17) is connected to the hydrogen side drainer (21) via a hydrogen side gas-water separator condenser pipe (19); a valve V2 and a valve V4 are respectively provided on the hydrogen side gas-water separator condenser pipe (19) and the hydrogen side drainer condensate outlet pipe (23); both valves V2 and V4 are opened at a fixed time and only one can be opened at the same time; the hydrogen side gas-water separator (17) is used to connect to a hydrogen collection system, and the hydrogen side condensate collecting tank (25) is provided with a hydrogen vent.

4. A water electrolysis hydrogen production system capable of lossless recovery of condensate according to any one of claims 1 to 3, characterized in that: The invention also comprises a water supply tank (28), wherein the oxygen side condensate collector (24) is connected to a water supply pump (29) via a condenser pipe (26) of the oxygen side condensate collector, one end of which is arranged at the bottom of the oxygen side condensate collector (24) and is a U-shaped pipe structure, and the bottom end is lower than the bottom of the water supply tank (28), the water supply tank (28) is connected to the oxygen side condensate collector condenser pipe (26) via a water supply tank outlet pipe (27), the interface between the water supply tank outlet pipe (27) and the oxygen side condensate collector condenser pipe (26) is arranged in front of the water supply pump (29), and the water supply tank outlet pipe (27) is arranged horizontally.

5. A water electrolysis hydrogen production system capable of lossless recovery of condensate according to claim 4, characterized in that: The water supply pump rear pipeline (30) is connected to the oxygen side water supply pipeline (31) and the hydrogen side water supply pipeline (32). A valve V5 is provided on the oxygen side water supply pipeline (31), and a valve V6 is provided on the hydrogen side water supply pipeline (32). The control device is used to control the valves V5 and V6.

6. A process for producing hydrogen by water electrolysis capable of lossless recovery of condensate, characterized in that: Including oxygen side recovery process and hydrogen side recovery process; The oxygen side recovery process comprises: controlling the valve V3 to be opened, so that the final oxygen side condensate water enters the oxygen side condensate liquid collector (24) from the oxygen side drainer (20), and after a small amount of oxygen in the final oxygen side condensate water is separated, controlling the water supply pump (29) to be opened, so that the final oxygen side condensate water and the oxygen side condensate liquid collector (24) flow back to the oxygen side gas scrubber (12); The hydrogen side recovery process comprises: controlling the valve V4 to be opened, so that the final hydrogen side condensate water enters the hydrogen side condensate collecting tank (25) from the hydrogen side drainer (21), and after a small amount of hydrogen in the final hydrogen side condensate water is separated, controlling the condensate pump (34) to be opened, so that the final hydrogen side condensate water flows back from the hydrogen side condensate collecting tank (25) to the hydrogen side gas scrubber (13); The oxygen side gas scrubber (12) and the hydrogen side gas scrubber (13) are used for oxygen-alkali separation water washing and hydrogen-alkali separation water washing of the oxygen and hydrogen produced by the electrolytic cell (1), respectively.

7. The process for producing hydrogen by water electrolysis capable of lossless recovery of condensate according to claim 6 is characterized in that: The oxygen side recovery process also includes: the alkaline oxygen discharged from the electrolytic cell (1) enters the oxygen side gas-liquid separator (6) for primary oxygen-alkali separation, the obtained alkaline solution flows back to the electrolytic cell (1), the obtained primary alkaline oxygen enters the oxygen side gas scrubber (12) for further oxygen-alkali separation, the alkaline solution obtained by washing flows back to the oxygen side gas-liquid separator (6) and then flows back to the electrolytic cell (1), the obtained water-saturated oxygen enters the oxygen cooler (14), cools and removes water to obtain primary dehydrated oxygen and primary oxygen side condensed water, the primary oxygen side condensed water flows back to the oxygen side gas-liquid separator (6) and then flows back to the electrolytic cell (1); The hydrogen side recovery process also includes: the alkaline hydrogen gas discharged from the electrolytic cell (1) enters the hydrogen side gas-liquid separator (7) for primary hydrogen-alkali separation, the obtained alkaline solution is refluxed to the electrolytic cell (1), the obtained primary alkaline hydrogen gas enters the hydrogen side gas scrubber (13) for further hydrogen-alkali separation, the obtained alkaline solution is refluxed to the hydrogen side gas-liquid separator (7) and then refluxed to the electrolytic cell (1), the obtained saturated water hydrogen gas enters the hydrogen cooler (15), is cooled and dehydrated to obtain primary dehydrated hydrogen gas and primary hydrogen side condensed water, and the primary hydrogen side condensed water is refluxed to the hydrogen side gas-liquid separator (7) and then refluxed to the electrolytic cell (1).

8. The process for producing hydrogen by water electrolysis capable of lossless recovery of condensate according to claim 7 is characterized in that: The primary dehydrated oxygen obtained by cooling and dehydration enters the oxygen side gas-water separator (16) to continue dehydration to obtain the final dehydrated oxygen and the final oxygen side condensed water. The final dehydrated oxygen is introduced into the oxygen collection system. The valve V3 is closed and the valve V1 is opened. The final oxygen side condensed water enters the oxygen side drainer (20). The valve V1 is closed and the valve V3 is opened. The final oxygen side condensed water enters the oxygen side condensate collector (24) to separate a small amount of oxygen therein and discharge the oxygen. The oxygen is then lifted by the water supply pump (29) and refluxed to the oxygen side gas scrubber (12). Hydrogen side recovery process The process also includes cooling and removing water to obtain primary dehydrated hydrogen which enters a hydrogen side gas-water separator (17), obtaining final dehydrated hydrogen and final hydrogen side condensed water, the final dehydrated hydrogen is introduced into a hydrogen collection system, valve V4 is closed, valve V2 is opened, the final hydrogen side condensed water enters a hydrogen side drainer (21), valve V2 is closed, valve V4 is opened, the final hydrogen side condensed water enters a hydrogen side condensate collecting tank (25), a small amount of hydrogen gas therein is separated and the hydrogen is discharged, and then the hydrogen is lifted by a condensate pump (34) and refluxed to a hydrogen side gas scrubber (13).

9. The process for producing hydrogen by water electrolysis capable of lossless recovery of condensate according to claim 8, characterized in that: The water supply pump (29) is connected to a water supply tank (28) in front. When the liquid level in the water supply tank (28) is low, the high-level condensate in the oxygen-side condensate collector (24) is pressed into the water supply tank (28) through the oxygen-side condensate collector condensation pipe (26) and the water supply tank outlet pipe (27). When the liquid level in the water supply tank (28) is high, the high-level water in the water supply tank (28) is pressed into the oxygen-side condensate collector (24) through the water supply tank outlet pipe (27) and the oxygen-side condensate collector condensation pipe (26). When the water supply pump (29) is turned on, water and condensate are driven from the oxygen-side condensate collector (24) and the water supply tank (28) to flow to the oxygen-side gas scrubber (12) at the same time.

10. A water electrolysis hydrogen production system capable of lossless recovery of condensate according to claim 9, characterized in that: When only the hydrogen side of the electrolyzer needs water replenishment, the water replenishment pump (29) is turned on, the valve V6 on the hydrogen side water replenishment pipeline (32) is opened, and the valve V5 on the oxygen side water replenishment pipeline (31) is closed; when only the oxygen side of the electrolyzer needs water replenishment, the valve V5 is opened and the valve V6 is closed.

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