AEM electrolytic bath test equipment and control method thereof

Abstract

The invention belongs to the technical field of hydrogen production through water electrolysis, and discloses AEM electrolytic bath testing equipment and a control method thereof. The equipment comprises an anode water vapor separator, an anode circulating pump, an anode radiator, an anode PTC heater, a cathode water vapor separator, a cathode circulating pump, a cathode radiator, a cathode PTC heater, an anode water scrubber, an anode condenser, an anode drop catcher, a cathode water scrubber, a cathode condenser and a cathode drop catcher. Three liquid inlet modes are integrated on one testing device, and the testing requirements of AEM electrolytic cells of different liquid inlet types are met through interlocking control of various valves and sensors.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen production by electrolysis of water, and in particular relates to an AEM electrolyzer testing device and a control method thereof. Background Art

[0002] Anion exchange membrane (AEM) water electrolysis to produce hydrogen is a new hydrogen production technology that uses anion exchange membrane as an electrolyte to produce hydrogen by electrolyzing water.

[0003] In the field of hydrogen production by electrolysis, compared with other technologies, AEM hydrogen production technology demonstrates extremely high competitive potential due to its powerful dynamic response capability, lower equipment cost and ultra-high efficiency.

[0004] AEM electrolyzer test equipment is a device specially used to evaluate and test the performance of AEM electrolyzers. It can realize specific performance testing, sensitivity testing, component selection, life evaluation and theoretical basic research of AEM electrolyzers according to user operating conditions, providing customers with high-precision and high-reliability testing needs.

[0005] With the continuous maturity of AEM electrolyzer technology and the expansion of its application field, the demand for AEM electrolyzer testing equipment is also gradually increasing. According to different AEM electrolysis technologies and design requirements, AEM electrolyzers have cathode liquid inlet, anode liquid inlet and simultaneous anode and cathode liquid inlet. These three liquid inlet methods have different advantages and disadvantages: if only the cathode is fed with alkaline solution, the hydrogen produced by the cathode contains alkaline mist, and the hydrogen purity is low, which needs to be purified by a huge purification system; if only the anode is fed with alkaline solution, the time from the anode to the cathode through the membrane is longer, and the amount of water is less, resulting in a very slow cathode reaction, which in turn affects the overall water electrolysis efficiency, but the hydrogen produced by this method is of higher purity and generally does not require subsequent purification treatment; if the anode and cathode are fed with alkaline solution at the same time, the entire control system needs to be well designed, especially the distribution of liquid inlet and pressure control on both sides.

[0006] At present, there is no consensus in the industry as to which of the three liquid inlet methods is better. Various methods are in the process of continuous testing and verification. Therefore, the research and development and production companies of AEM electrolyzers are likely to develop electrolyzer technologies with these three different liquid inlet methods at the same time. The existing AEM electrolyzer test equipment on the market is all custom-designed and manufactured one-to-one, that is, one liquid inlet method corresponds to one test equipment. This also leads to the need to frequently replace test equipment when testing AEM electrolyzers. The test process is extremely inconvenient and the test cost is extremely high.

[0007] After searching for patents, it was found that no testing equipment manufacturers or R&D companies have applied for patents related to the AEM water electrolysis test bench.

[0008] In order to cope with the rapid development of existing AEM electrolyzer technology and the increasing demand for testing functions, there is an urgent need for an AEM electrolyzer testing device that integrates different liquid inlet methods. Summary of the invention

[0009] In order to overcome the shortcomings of the prior art, the present invention provides an AEM electrolytic cell testing device and a control method thereof, which integrates three liquid inlet modes on one testing device and meets the testing requirements of AEM electrolytic cells with different liquid inlet types through interlocking control of various valves and sensors.

[0010] The above-mentioned object of the present invention is achieved through the following technical scheme: an AEM electrolytic cell testing equipment, comprising: an anode water vapor separator, an anode circulation pump, an anode radiator, an anode PTC heater, a cathode water vapor separator, a cathode circulation pump, a cathode radiator, a cathode PTC heater, an anode water washer, an anode condenser, an anode drip collector, a cathode water washer, a cathode condenser, and a cathode drip collector; wherein the anode of the AEM electrolytic cell is connected to a circulation circuit, on which the anode water vapor separator, an anode circulation pump, an anode radiator, and an anode PTC heater are arranged in sequence, and a circulation branch is provided on the anode water vapor separator, on which the anode water washer, an anode condenser, and an anode drip collector are arranged in sequence, and the cathode of the AEM electrolytic cell is connected to a circulation circuit, on which the cathode water vapor separator, a cathode circulation pump, a cathode radiator, and a cathode PTC heater are arranged in sequence, and a circulation branch is provided on the cathode water vapor separator, on which the cathode water washer, a cathode condenser, and a cathode drip collector are arranged in sequence.

[0011] Furthermore, the anode water vapor separator is also connected to an online concentration detector, a waste liquid tank, and a high-concentration alkali liquid tank; a drain valve a is provided between the anode water vapor separator and the waste liquid tank, and a branch is provided between the drain valve a and the anode water vapor separator to connect to a wastewater pipeline, on which a drain valve a is provided; a replenishment valve, a high-pressure pump a, and a filter are provided in sequence between the anode water vapor separator and the high-concentration alkali liquid tank; the cathode water vapor separator is also connected to an online concentration detector and a waste liquid tank; a drain valve b is provided between the cathode water vapor separator and the waste liquid tank, and a branch is provided between the drain valve b and the cathode water vapor separator to connect to a wastewater pipeline, on which a drain valve b is provided.

[0012] Furthermore, the anode droplet collector is also connected to an oxygen discharge port, a waste oxygen discharge port, and a sampling port a; an oxygen back pressure valve is provided between the anode droplet collector and the oxygen discharge port; a pressure reducing valve a, a dryer a, a rotor flowmeter a, and an oxygen-hydrogen analyzer are provided in sequence between the anode droplet collector and the waste oxygen discharge port; a dryer b and a rotor flowmeter b are provided in sequence between the anode droplet collector and the sampling port a; the cathode droplet collector is also connected to a hydrogen discharge port, a waste hydrogen discharge port, and a sampling port b; a hydrogen main valve, a hydrogen mass flowmeter, a hydrogen back pressure valve, and a hydrogen gas analyzer are provided in sequence between the cathode droplet collector and the hydrogen discharge port. Valve, a hydrogen main valve, a hydrogen mass flowmeter and a pressure reducing valve b are arranged in sequence between the cathode droplet collector and the waste hydrogen discharge port; two parallel routes are arranged from the pressure reducing valve b to the waste hydrogen discharge port, one route is provided with a rotor flowmeter e and a dew point meter, and the other route is provided with a dryer c, a rotor flowmeter c and an oxygen analyzer in hydrogen; a hydrogen main valve, a hydrogen mass flowmeter, a pressure reducing valve b, a dryer d and a rotor flowmeter d are arranged in sequence between the cathode droplet collector and the sampling port b; a branch route is connected in parallel to the above-mentioned hydrogen main valve, and a purification system valve and a purification system are arranged in sequence on the branch route.

[0013] Furthermore, the anode water washer is connected to the cathode water washer through a line, and an anode water replenishment valve and a cathode water replenishment valve are provided on the line. A branch is provided between the anode water replenishment valve and the cathode water replenishment valve to connect the pure water source, and a pure water tank and a high-pressure pump b are provided on the branch; an anode liquid inlet valve is also provided between the anode PTC heater and the AEM electrolyzer; a cathode liquid inlet valve is also provided between the cathode PTC heater and the AEM electrolyzer; an anode circulation pipeline valve and an anode filter are provided in sequence between the anode water vapor separator and the anode circulation pump; a cathode circulation pipeline valve and a cathode filter are provided in sequence between the cathode water vapor separator and the cathode circulation pump; a line is connected between the anode water vapor separator and the cathode water vapor separator, and a connecting valve is provided on the line; a branch is provided between the anode PTC heater and the anode liquid inlet valve to connect the line between the cathode PTC heater and the cathode liquid inlet valve, and a cathode alkali solution distribution valve is provided on the branch; a branch is provided between the anode filter and the anode circulation pump to connect the line between the cathode filter and the cathode circulation pump, and an anode alkali solution confluence valve is provided on the branch.

[0014] Another object of the present invention is to protect the control method of the above-mentioned AEM electrolyzer test equipment, including the following methods:

[0015] 1. Single anode liquid inlet, cathode liquid not inlet: anode electrolyte circulation, anode side water replenishment; cathode back pressure, anode normal pressure or back pressure;

[0016] 2. Single cathode liquid inlet, anode liquid inlet: cathode electrolyte circulation, cathode side water replenishment; cathode back pressure, anode normal pressure or back pressure;

[0017] 3. The cathode and anode are fed with liquid at the same time, and the back pressure is independent: the cathode and anode electrolytes are fed with liquid for circulation at the same time; water is replenished on the cathode side, and alkali is replenished on the anode side; cathode back pressure, anode back pressure or normal pressure;

[0018] 4. The cathode and anode are fed with liquid separately at the same time, and the back pressure is interlocked: the cathode and anode electrolytes are fed with liquid separately through two circulation pumps, and the cathode and anode water-gas separators are connected; water is replenished on both sides of the cathode and anode or on one side alone; the cathode and anode are back-pressured at the same time;

[0019] 5. The cathode and anode are fed with liquid together, and the back pressure is interlocked: the cathode and anode electrolytes share a circulating pump for liquid circulation, and the cathode and anode water-gas separators are connected; water is replenished on both sides of the cathode and anode or on one side alone; the cathode and anode are back-pressured at the same time.

[0020] Furthermore, the control method of the single anode feeding liquid and the cathode not feeding liquid is specifically as follows:

[0021] S1.1. The anode water vapor separator is used as the main water tank to store a certain amount of electrolyte, which is a 1M KOH solution by mass fraction;

[0022] S1.2. Open the anode liquid inlet valve and the anode circulation pipeline valve, and close the cathode liquid inlet valve, cathode circulation pipeline valve, connecting valve, cathode alkali solution distribution valve, and anode alkali solution confluence valve;

[0023] S1.3. Start the anode circulation pump, the electrolyte is pumped from the anode water vapor separator into the electrolytic cell, water is electrolyzed in the electrolytic cell, and the circulation flow rate is calculated according to the amount of electrolysis; turn on the anode circuit radiator to maintain the electrolytic cell temperature at 60-90°C;

[0024] S1.4. The anode produces oxygen, which enters the anode water vapor separator along with the electrolyte. After gravity separation, the oxygen goes out from the upper port, is washed by the scrubber to remove alkali, and condensed by the condenser to remove water, and is finally emptied or collected;

[0025] S1.5. The liquid in the anode scrubber and anode drip collector is regularly discharged into the anode water vapor separator for recirculation;

[0026] S1.6. According to the change of the liquid level of the anode water vapor separator, water is regularly replenished to the oxygen separator through the water replenishment pump, and the amount of water replenishment is calculated based on the amount of electrolyzed water;

[0027] S1.7. The hydrogen produced at the cathode enters the cathode water vapor separator. After gravity separation, the hydrogen goes out from the upper port, is washed and de-alkalied by the cathode water washer, and condensed and de-watered by the condenser, and finally enters the purification system for purification or discharge and collection;

[0028] S1.8. The liquid in the cathode water washer and cathode drip collector is regularly discharged into the cathode water washing separator, and the water in the cathode water vapor separator is regularly discharged into the waste water pipe.

[0029] Furthermore, the control method of the single cathode feeding liquid and the anode not feeding liquid is specifically as follows:

[0030] S2.1. The cathode water vapor separator is used as the main water tank to store a certain amount of electrolyte, which is a 1M KOH solution by mass fraction;

[0031] S2.2. Open the cathode liquid inlet valve and cathode circulation pipeline valve, and close the anode liquid inlet valve, anode circulation pipeline valve, connecting valve, cathode alkali solution distribution valve, and anode alkali solution confluence valve;

[0032] S2.3. Start the cathode circulation pump, the electrolyte is pumped from the cathode water vapor separator into the electrolytic cell, water is electrolyzed in the electrolytic cell, and the circulation flow rate is calculated according to the amount of electrolysis; turn on the cathode circuit radiator to maintain the electrolytic cell temperature at 60-90°C;

[0033] S2.4. The oxygen generated by the anode enters the anode water vapor separator. After gravity separation, the oxygen goes out from the upper port, is washed by the scrubber to remove alkali, and is condensed by the condenser to remove water, and finally is emptied or collected;

[0034] S2.5. The liquid in the anode water washer and the anode drip collector is regularly discharged into the anode water vapor separator, and the water in the anode water vapor separator is regularly discharged into the waste water pipe;

[0035] S2.6. The hydrogen produced at the cathode enters the cathode water vapor separator. After gravity separation, the hydrogen goes out from the upper port, is washed and de-alkalied by the cathode water washer, and condensed and de-watered by the condenser, and finally enters the purification system for purification or discharge and collection;

[0036] S2.7. The liquid in the cathode water scrubber and cathode drip collector is regularly discharged into the cathode water vapor separator for recirculation;

[0037] S2.8. According to the change of liquid level in the cathode water vapor separator, water is regularly replenished to the cathode water vapor separator through the water replenishment pump, and the replenishment amount is calculated based on the amount of electrolyzed water.

[0038] Furthermore, the cathode and anode are simultaneously fed with liquid, and the control method of independent back pressure is specifically as follows:

[0039] S3.1. The anode water vapor separator and the cathode water vapor separator are both used as main water tanks to store a certain amount of electrolyte, which is a 1M KOH solution;

[0040] S3.2. Open the anode liquid inlet valve, cathode liquid inlet valve, anode circulation pipeline valve, cathode circulation pipeline valve, and close the connecting valve, cathode alkali solution distribution valve, and anode alkali solution confluence valve;

[0041] S3.3. Start the anode circulation pump and cathode circulation pump respectively, and the electrolyte is pumped into the electrolytic cell from the anode water vapor separator and cathode water vapor separator respectively. Water is electrolyzed in the electrolytic cell, and the circulation flow rate is calculated according to the electrolysis quantity; turn on the anode radiator and cathode radiator, and keep the electrolytic cell temperature at 60-90°C;

[0042] S3.4. The anode produces oxygen, which enters the anode water vapor separator along with the electrolyte. After gravity separation, the oxygen goes out from the upper port, is washed by the scrubber to remove alkali, and condensed by the condenser to remove water, and is finally emptied or collected;

[0043] S3.5. The liquid in the anode steam generator and the anode drip collector is regularly discharged into the anode steam separator and recirculated;

[0044] S3.6. According to the change of the alkali concentration in the anode water vapor separator, alkali is added to the anode water vapor separator through the alkali replenishing pump to maintain the alkali concentration in the anode water vapor separator;

[0045] S3.7. Hydrogen is generated at the cathode and enters the cathode water vapor separator together with the electrolyte. After gravity separation, the hydrogen goes out from the upper port, is washed by the scrubber to remove alkali, and condensed by the condenser to remove water, and finally enters the purification system for purification or discharge and collection;

[0046] S3.8. The liquid in the cathode water scrubber and cathode drip collector is regularly discharged into the cathode water vapor separator and recirculated;

[0047] S3.9. According to the change of liquid level in the cathode water vapor separator, water is regularly replenished to the cathode water vapor separator through the water replenishment pump, and the replenishment amount is calculated based on the amount of electrolyzed water.

[0048] Furthermore, the cathode and anode are fed with liquid separately at the same time, and the control method of the interlocking back pressure is specifically as follows:

[0049] S4.1. The anode water vapor separator and the cathode water vapor separator are both used as main water tanks to store a certain amount of electrolyte, which is a 1M KOH solution;

[0050] S4.2. Open the anode liquid inlet valve, cathode liquid inlet valve, anode circulation pipeline valve, cathode circulation pipeline valve, and connecting valve, and close the cathode alkali solution distribution valve and anode alkali solution confluence valve;

[0051] S4.3. Start the anode and cathode circulation pumps respectively, and the electrolyte is pumped into the electrolytic cell from the anode and cathode water vapor separators respectively. Water is electrolyzed in the electrolytic cell, and the circulation flow rate is calculated according to the electrolysis quantity; turn on the anode and cathode radiators to maintain the electrolytic cell temperature at 60-90°C;

[0052] S4.4. The anode produces oxygen, which enters the anode water vapor separator along with the electrolyte. After gravity separation, the oxygen leaves from the upper port, is washed by the scrubber to remove alkali, condensed by the condenser to remove water, and finally emptied or collected;

[0053] S4.5. The liquid in the anode steam generator and the anode drip collector is regularly discharged into the anode steam separator and recirculated;

[0054] S4.6. Hydrogen is generated at the cathode and enters the cathode water vapor separator together with the electrolyte. After gravity separation, the hydrogen goes out from the upper port, is washed by the scrubber to remove alkali, and condensed by the condenser to remove water, and finally enters the purification system for purification or discharge and collection;

[0055] S4.7. The liquid in the cathode water scrubber and cathode drip collector is regularly discharged into the cathode water vapor separator and recirculated;

[0056] S4.8. According to the changes in the liquid levels of the cathode and anode water vapor separators, water is regularly replenished to the cathode / anode water vapor separators through the water replenishment pump, and the amount of water replenishment is calculated based on the amount of electrolyzed water.

[0057] Furthermore, the cathode and anode are fed with liquid together, and the control method of interlocking back pressure is specifically as follows:

[0058] S5.1. The anode water vapor separator and the cathode water vapor separator are both used as main water tanks to store a certain amount of electrolyte, which is a 1M KOH solution;

[0059] S5.2. Open the anode liquid inlet valve, cathode liquid inlet valve, anode circulation pipeline valve, cathode circulation pipeline valve, connecting vessel valve, cathode alkali solution distribution valve, and anode alkali solution confluence valve;

[0060] S5.3. Start the cathode circulation pump, and the electrolyte is pumped into the electrolytic cell from the anode and cathode water vapor separators respectively. Water is electrolyzed in the electrolytic cell, and the circulation flow rate is calculated according to the amount of electrolysis; turn on the anode and cathode radiators to maintain the electrolytic cell temperature at 60-90°C;

[0061] S5.4. The anode produces oxygen, which enters the anode water vapor separator along with the electrolyte. After gravity separation, the oxygen leaves from the upper port, is washed by the scrubber to remove alkali, and condensed by the condenser to remove water, and is finally discharged or collected;

[0062] S5.5. The liquid in the anode steam generator and the anode drip collector is regularly discharged into the anode steam separator and recirculated;

[0063] S5.6. Hydrogen is generated at the cathode and enters the cathode water vapor separator together with the electrolyte. After gravity separation, the hydrogen goes out from the upper port, is washed by the scrubber to remove alkali, and condensed by the condenser to remove water, and finally enters the purification system for purification or discharge and collection;

[0064] S5.7. The liquid in the cathode water scrubber and cathode drip collector is regularly discharged into the cathode water vapor separator and recirculated;

[0065] S5.8. According to the changes in the liquid levels of the cathode and anode water vapor separators, water is regularly replenished to the cathode / anode water vapor separators through the water replenishment pump, and the amount of water replenishment is calculated based on the amount of electrolyzed water.

[0066] The beneficial effects of the present invention compared with the prior art are:

[0067] 1. One set of equipment integrates the test functions of the original three devices, greatly saving the cost of purchasing test equipment;

[0068] 2. The reasonable structural layout inside the test equipment simplifies the testing process of different types of AEM electrolyzer products;

[0069] 3. The test control strategy developed for it can quickly and effectively switch between different test requirements;

[0070] 4. Currently, there is a shortage of AEM electrolyzer testing equipment products in the market, and the invented testing equipment can effectively fill the gap in such market products. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0072] Figure 1 It is a schematic diagram of the main structure of the AEM electrolytic cell testing equipment of the present invention;

[0073] Figure 2 It is a schematic diagram of the overall structure of the AEM electrolytic cell testing equipment of the present invention.

[0074] In the figure, 1. AEM electrolyzer; 2. Anode water vapor separator; 3. Cathode water vapor separator; 4. Anode circulation pump; 5. Anode radiator; 6. Anode PTC heater; 7. Cathode circulation pump; 8. Cathode radiator; 9. Cathode PTC heater; 10. Anode water washer; 11. Anode condenser; 12. Anode drip collector; 13. Cathode water washer; 14. Cathode condenser; 15. Cathode drip collector; 16. Online concentration detector; 1 7. Waste liquid tank; 18. Drain valve a; 19. Drain valve a; 20. Wastewater pipeline; 21. Refill valve; 22. High-pressure pump a; 23. Filter; 24. Drain valve b; 25. Drain valve b; 26. Oxygen discharge port; 27. Waste oxygen discharge port; 28. Sampling port a; 29. ​​Oxygen back pressure valve; 30. Pressure reducing valve a; 31. Dryer a; 32. Rotor flowmeter a; 34. Hydrogen in oxygen analyzer; 35. Dryer b; 36. Rotor flowmeter b; 37. High concentration alkali liquid tank; 38. Hydrogen discharge port; 39. Waste hydrogen discharge port; 40. Sampling port b; 41. Hydrogen main valve; 42. Hydrogen mass flowmeter; 43. Hydrogen back pressure valve; 44. Pressure reducing valve b; 45. Rotor flowmeter e; 46. Valve to purification system; 47. Dew point meter; 48. Dryer c; 49. Rotor flowmeter c; 50. Purification system; 51. Hydrogen oxygen analyzer; 52. Dry Dryer d; 53. Rotor flowmeter d; 55. Anode water supply valve; 56. Cathode water supply valve; 57. Pure water source; 58. Pure water tank; 59. High-pressure pump b; 60. Anode circulation pipeline valve; 61. Anode filter; 62. Cathode circulation pipeline valve; 63. Cathode filter; 64. Anode liquid inlet valve; 65. Cathode liquid inlet valve; 66. Connecting vessel valve; 67. Cathode alkali solution distribution valve; 68. Anode alkali solution confluence valve. DETAILED DESCRIPTION

[0075] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0076] Example 1: Anode liquid inlet (balanced pressure / differential pressure on both sides)

[0077] The AEM electrolyzer is designed to produce 20Nm of hydrogen 3 / h, hydrogen outlet pressure 3.0MPa; designed oxygen production is 10Nm 3 / h, oxygen outlet pressure 0~3.0MPa.

[0078] The water volume of the anode water vapor separator is 120L. Before power on, first inject 80L of 1M KOH solution into the anode water vapor separator (main water tank), then open the anode liquid inlet valve and the anode circulation pipeline valve, close the cathode liquid inlet valve, cathode circulation pipeline valve, connecting valve, cathode alkali solution distribution valve, and anode alkali solution confluence valve, and turn on the anode circulation pump (circulation capacity is 6m 3 / h), first let the electrolyte circulate in the loop for 5 minutes to fully moisten the electrolytic cell and pipeline. Turn on the hydrogen production power supply, slowly adjust the current value to the rated current of 800A, at this time the electrolytic cell starts to electrolyze water, turn on the anode circuit radiator, and keep the electrolytic cell temperature at 65℃.

[0079] The anode produces oxygen, which enters the anode water vapor separator along with the electrolyte. After gravity separation, the oxygen goes out from the upper port, and is exhausted after being washed and de-alkalied by the anode water scrubber and condensed and dehydrated by the condenser. The liquid in the anode water scrubber and the anode drip collector is discharged into the anode water vapor separator and enters the cycle again. According to the change of the liquid level of the anode water vapor separator, the anode water vapor separator is replenished with water through the water replenishment pump (water replenishment capacity is 60L / h).

[0080] The hydrogen produced at the cathode enters the cathode water vapor separator. After gravity separation, the hydrogen goes out from the upper port, is washed and de-alkalied by the cathode water scrubber, condensed and de-watered by the condenser, and finally discharged into the air. The liquid in the cathode water scrubber and cathode drip collector is discharged into the cathode water vapor separator, and then discharged to the wastewater pipeline at regular intervals.

[0081] Test results: The electrolyzer and test equipment are operating normally. The actual hydrogen production is 19.89m 3 / h, hydrogen back pressure 3.0MPa, oxygen content in hydrogen 106ppm; actual oxygen production 9.87m 3 / h, oxygen back pressure 0 / 1.6 / 3.0MPa, hydrogen content in oxygen is 1.8%VOL.

[0082] Example 2: Cathode liquid inlet (balanced pressure / differential pressure on both sides)

[0083] The AEM electrolyzer is designed to produce 20Nm of hydrogen 3 / h, hydrogen outlet pressure 3.0MPa; designed oxygen production is 10Nm 3 / h, oxygen outlet pressure 0~3.0MPa.

[0084] The water volume of the cathode water vapor separator is 120L. Before power on, first inject 80L of 1M KOH solution into the cathode water vapor separator (main water tank), then open the cathode liquid inlet valve and cathode circulation pipeline valve, close the anode liquid inlet valve, anode circulation pipeline valve, connecting valve, cathode alkali solution distribution valve, anode alkali solution confluence valve, and turn on the cathode circulation pump (circulation capacity is 6m 3 / h), first let the electrolyte circulate in the loop for 5 minutes to fully moisten the electrolyzer and pipeline. Turn on the hydrogen production power supply, slowly adjust the current value to the rated current of 800A, then the electrolyzer starts to work and electrolyze water, turn on the cathode circuit radiator, and keep the electrolyzer temperature at 65℃.

[0085] The oxygen produced by the anode enters the anode water vapor separator. After gravity separation, the oxygen goes out from the upper port, is washed and de-alkalied by the anode water washer, and condensed and de-watered by the condenser, and then is emptied. The liquid in the anode water washer and the anode drip collector is discharged into the anode water vapor separator, and then discharged to the wastewater pipeline at a fixed time.

[0086] The cathode produces hydrogen, which enters the cathode water vapor separator along with the electrolyte. After gravity separation, the hydrogen goes out from the upper port, is washed and de-alkalied by the cathode water scrubber, condensed and de-watered by the condenser, and finally discharged into the air. The liquid in the cathode water scrubber and the cathode drip collector is discharged into the cathode water vapor separator and enters the cycle again. According to the change of the liquid level in the cathode water vapor separator, the cathode water washing separator is regularly replenished with water through the water replenishment pump (water replenishment capacity is 60L / h).

[0087] Test results: The electrolyzer and test equipment are operating normally. The actual hydrogen production is 19.45m 3 / h, hydrogen back pressure 3.0MPa, oxygen content in hydrogen 436ppm; actual oxygen production 9.78m 3 / h, oxygen back pressure 0 / 1.6 / 3.0MPa, hydrogen content in oxygen is 1.5% VOL.

[0088] Example 3: Liquid inlet on both sides (independent back pressure, equal pressure / differential pressure on both sides)

[0089] The AEM electrolyzer is designed to produce 20Nm of hydrogen 3 / h, hydrogen outlet pressure 3.0MPa; designed oxygen production is 10Nm 3 / h, oxygen outlet pressure 0~3.0MPa.

[0090] The water volume of the cathode and anode water vapor separators is 120L. Before power on, first inject 40L of 1M KOH solution into the cathode and anode water vapor separators (water tanks) respectively, then open the anode liquid inlet valve, cathode liquid inlet valve, anode circulation pipeline valve, cathode circulation pipeline valve, close the connecting valve, cathode alkali solution distribution valve, anode alkali solution confluence valve, and simultaneously open the cathode and anode circulation pumps (circulation capacity is 6m 3 / h), first let the electrolyte circulate in the loop for 5 minutes to fully moisten the electrolyzer and pipeline. Turn on the hydrogen production power supply, slowly adjust the current value to the rated current of 800A, then the electrolyzer starts to work and electrolyze water, turn on the cathode and anode circuit radiators, and keep the electrolyzer temperature at 65℃.

[0091] The anode produces oxygen, which enters the anode water vapor separator along with the electrolyte. After gravity separation, the oxygen goes out from the upper port, is washed and de-alkalied by the anode water scrubber, and condensed and de-hydrated by the condenser before being emptied. The liquid in the anode water scrubber and the anode drip collector is discharged into the anode water vapor separator and enters the cycle again. According to the change of the alkali concentration in the anode water vapor separator, the alkali is replenished to the anode water vapor separator through the alkali replenishment pump to maintain the alkali concentration in the anode water vapor separator.

[0092] The cathode produces hydrogen, which enters the cathode water vapor separator along with the electrolyte. After gravity separation, the hydrogen goes out from the upper port, is washed and de-alkalied by the cathode water scrubber, condensed and de-watered by the condenser, and finally discharged into the air. The liquid in the cathode water scrubber and the cathode drip collector is discharged into the hydrogen separator and enters the cycle again. According to the liquid level change of the cathode water vapor separator, water is replenished to the cathode water vapor separator through the water replenishment pump (water replenishment capacity is 60L / h).

[0093] Test results: The electrolyzer and test equipment are operating normally. The actual hydrogen production is 19.83m 3 / h, hydrogen back pressure 3.0MPa, oxygen content in hydrogen 216ppm; actual oxygen production 9.82m 3 / h, oxygen 0 / 1.6 / 3.0MPa, hydrogen content in oxygen is 1.9%VOL.

[0094] Example 4: Liquid inlet on both sides (interlocking back pressure 1, equal pressure on both sides)

[0095] The AEM electrolyzer is designed to produce 20Nm of hydrogen 3 / h, hydrogen outlet pressure 3.0MPa; designed oxygen production is 10Nm 3 / h oxygen outlet pressure 3.0MPa.

[0096] The water volume of the cathode and anode water vapor separators is 120L. Before power on, first inject 40L of 1M KOH solution into the cathode and anode water vapor separators (water tanks) respectively, then open the anode liquid inlet valve, cathode liquid inlet valve, anode circulation pipeline valve, cathode circulation pipeline valve, and connecting valve, close the cathode alkali solution distribution valve and anode alkali solution confluence valve, and at the same time open the cathode and anode circulation pumps (circulation capacity is 6m 3 / h), first let the electrolyte circulate in the loop for 5 minutes to fully moisten the electrolyzer and pipeline. Turn on the hydrogen production power supply, slowly adjust the current value to the rated current of 800A, then the electrolyzer starts to work and electrolyze water, turn on the cathode and anode circuit radiators, and keep the electrolyzer temperature at 65℃.

[0097] The anode produces oxygen, which enters the anode water vapor separator along with the electrolyte. After gravity separation, the oxygen goes out from the upper port, is washed and de-alkalied by the anode water washer, and condensed and de-watered by the condenser, and then is emptied. The liquid in the anode water washer and the anode drip collector is discharged into the anode water vapor separator and enters the cycle again.

[0098] The cathode produces hydrogen, which enters the cathode water vapor separator along with the electrolyte. After gravity separation, the hydrogen goes out from the upper port, is washed and de-alkalied by the cathode water scrubber, condensed and de-watered by the condenser, and finally discharged into the air. The liquid in the cathode water scrubber and the cathode drip collector is discharged into the hydrogen separator and enters the cycle again. According to the liquid level changes of the cathode and anode water vapor separators, water is replenished to the cathode / anode water vapor separators through the water replenishment pump (water replenishment capacity is 60L / h).

[0099] Test results: The electrolyzer and test equipment are operating normally. The actual hydrogen production is 19.43m 3 / h, hydrogen back pressure 3.0MPa, oxygen content in hydrogen 376ppm; actual oxygen production 9.55m 3 / h, oxygen back pressure 3.0MPa, hydrogen content in oxygen 0.9%VOL.

[0100] Example 5: Liquid inlet on both sides (interlocking back pressure 2, equal pressure on both sides)

[0101] The AEM electrolyzer is designed to produce 20Nm of hydrogen 3 / h, hydrogen outlet pressure 3.0MPa; designed oxygen production is 10Nm 3 / h oxygen outlet pressure 3.0MPa.

[0102] The water volume of the cathode and anode water vapor separators is 120L. Before power on, first inject 40L of 1M KOH solution into the cathode and anode water vapor separators (water tanks) respectively, then open the anode liquid inlet valve, cathode liquid inlet valve, anode circulation pipeline valve, cathode circulation pipeline valve, connecting valve, cathode alkali solution distribution valve, anode alkali solution confluence valve, and turn on the cathode circulation pump (circulation capacity is 6m 3 / h), first let the electrolyte circulate in the loop for 5 minutes to fully moisten the electrolyzer and pipeline. Turn on the hydrogen production power supply, slowly adjust the current value to the rated current of 800A, then the electrolyzer starts to work and electrolyze water, turn on the cathode and anode circuit radiators, and keep the electrolyzer temperature at 65℃.

[0103] The anode produces oxygen, which enters the anode water vapor separator along with the electrolyte. After gravity separation, the oxygen goes out from the upper port, is washed and de-alkalied by the anode water washer, and condensed and de-watered by the condenser, and then is emptied. The liquid in the anode water washer and the anode drip collector is discharged into the anode water vapor separator and enters the cycle again.

[0104] The cathode produces hydrogen, which enters the cathode water vapor separator along with the electrolyte. After gravity separation, the hydrogen goes out from the upper port, is washed and de-alkalied by the cathode water scrubber, condensed and de-watered by the condenser, and finally discharged into the air. The liquid in the cathode water scrubber and the cathode drip collector is discharged into the hydrogen separator and enters the cycle again. According to the liquid level changes of the cathode and anode water vapor separators, water is replenished to the cathode / anode water vapor separators through the water replenishment pump (water replenishment capacity is 60L / h).

[0105] Test results: The electrolyzer and test equipment are operating normally. The actual hydrogen production is 19.73m 3 / h, hydrogen back pressure 3.0MPa, oxygen content in hydrogen 366ppm; actual oxygen production 9.67m 3 / h, oxygen back pressure 3.0MPa, hydrogen content in oxygen is 1.1%VOL.

[0106] Comparison of Examples

[0107] Table 2 Comparison of test results of embodiments

[0108]

[0109]

[0110] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. An AEM electrolyzer testing device, characterized in that: include: Anode water vapor separator (2), anode circulation pump (4), anode radiator (5), anode PTC heater (6), cathode water vapor separator (3), cathode circulation pump (7), cathode radiator (8), cathode PTC heater (9), anode water washer (10), anode condenser (11), anode drip collector (12), cathode water washer (13), cathode condenser (14), cathode drip collector (15); wherein the anode of the AEM electrolytic cell (1) is connected to a circulation line, and the circulation line is provided with an anode water vapor separator (2), an anode circulation pump (4), an anode radiator (5), An anode PTC heater (6) is provided on the anode water vapor separator (2), and a circulation branch is provided on the circulation branch in sequence. An anode water washer (10), an anode condenser (11), and an anode drip collector (12) are provided on the circulation branch in sequence. The cathode of the AEM electrolytic cell (1) is connected to a circulation line, and a cathode water vapor separator (3), a cathode circulation pump (7), a cathode radiator (8), and a cathode PTC heater (9) are provided on the circulation line in sequence. A circulation branch is provided on the cathode water vapor separator (3), and a cathode water washer (13), a cathode condenser (14), and a cathode drip collector (15) are provided on the circulation branch in sequence.

2. The AEM electrolyzer testing device according to claim 1, characterized in that: The anode water vapor separator (2) is also connected to an online concentration detector (16), a waste liquid tank (17), and a high-concentration alkali liquid tank (37); a drain valve a (18) is provided between the anode water vapor separator (2) and the waste liquid tank (17); a branch is provided between the drain valve a (18) and the anode water vapor separator (2) to connect to a waste water pipeline (20), on which a drain valve a (19) is provided; a liquid replenishment valve (21), a high-pressure pump a (22), and a filter (23) are provided in sequence between the anode water vapor separator (2) and the high-concentration alkali liquid tank (37); the cathode water vapor separator (3) is also connected to an online concentration detector (16) and a waste liquid tank (17); a drain valve b (24) is provided between the cathode water vapor separator (3) and the waste liquid tank (17); a branch is provided between the drain valve b (24) and the cathode water vapor separator (3) to connect to a waste water pipeline (20), on which a drain valve b (25) is provided.

3. The AEM electrolyzer testing device according to claim 1, characterized in that: The anode droplet collector (12) is also connected to an oxygen discharge port (26), a waste oxygen discharge port (27), and a sampling port a (28); an oxygen back pressure valve (29) is provided between the anode droplet collector (12) and the oxygen discharge port (26); a pressure reducing valve a (30), a dryer a (31), a rotor flowmeter a (32), and an oxygen-hydrogen analyzer (34) are provided in sequence between the anode droplet collector (12) and the waste oxygen discharge port (27); a dryer b (35) and a rotor flowmeter b (36) are provided in sequence between the anode droplet collector (12) and the sampling port a (28); the cathode droplet collector (15) is also connected to a hydrogen discharge port (38), a waste hydrogen discharge port (39), and a sampling port b (40); a hydrogen main valve (41), a hydrogen mass flowmeter (42), a hydrogen analyzer (34) are provided in sequence between the cathode droplet collector (15) and the hydrogen discharge port (38); A back pressure valve (43) is provided between the cathode droplet collector (15) and the waste hydrogen discharge port (39). A hydrogen main line valve (41), a hydrogen mass flow meter (42), and a pressure reducing valve b (44) are provided in sequence. Two parallel lines are provided from the pressure reducing valve b (44) to the waste hydrogen discharge port (39). One line is provided with a rotor flow meter e (45) and a dew point meter (47), and the other line is provided with a dryer c (48), a rotor flow meter c (49), and a hydrogen oxygen analyzer (51). A hydrogen main line valve (41), a hydrogen mass flow meter (42), a pressure reducing valve b (44), a dryer d (52), and a rotor flow meter d (53) are provided in sequence between the cathode droplet collector (15) and the sampling port b (40). A branch line is connected in parallel to the hydrogen main line valve (41). A purification system valve (46) and a purification system (50) are provided in sequence on the branch line.

4. The AEM electrolyzer testing device according to claim 1, characterized in that: The anode water washer (10) and the cathode water washer (13) are connected via a circuit, and an anode water supply valve (55) and a cathode water supply valve (56) are provided on the circuit. A branch line connected to a pure water source (57) is provided between the anode water supply valve (55) and the cathode water supply valve (56), and a pure water tank (58) and a high-pressure pump b (59) are provided on the branch line. An anode liquid inlet valve (64) is also provided between the anode PTC heater (6) and the AEM electrolyzer (1). A cathode liquid inlet valve (65) is also provided between the cathode PTC heater (9) and the AEM electrolyzer (1). An anode circulation pipeline valve (60), an anode filter (61) and a cathode filter (62) are provided in sequence between the anode water vapor separator (2) and the anode circulation pump (4). ); a cathode circulation pipeline valve (62) and a cathode filter (63) are provided in sequence between the cathode water vapor separator (3) and the cathode circulation pump (7); a line is connected between the anode water vapor separator (2) and the cathode water vapor separator (3), and a connecting valve (66) is provided on the line; a branch is provided between the anode PTC heater (6) and the anode liquid inlet valve (64) to connect the line between the cathode PTC heater (9) and the cathode liquid inlet valve (65), and a cathode alkali solution distribution valve (67) is provided on the branch; a branch is provided between the anode filter (61) and the anode circulation pump (4) to connect the line between the cathode filter (63) and the cathode circulation pump (7), and an anode alkali solution confluence valve (68) is provided on the branch.

5. The control method of the AEM electrolyzer testing device according to claim 4, characterized in that: The following methods are included: S1. Single anode liquid inflow, cathode liquid not inflow: anode electrolyte circulation, anode side water replenishment; Cathode back pressure, anode normal pressure or back pressure; S2. Only the cathode is fed with liquid, and the anode is not fed with liquid: the cathode electrolyte circulates, and the cathode side is replenished with water; Cathode back pressure, anode normal pressure or back pressure; S3. The cathode and anode are fed with liquid at the same time, and the back pressure is independent: the cathode and anode electrolytes are fed with liquid for circulation at the same time; the cathode side is replenished with water, and the anode side is replenished with alkali; Cathode back pressure, anode back pressure or normal pressure; S4. The cathode and anode are fed with liquid separately at the same time, and the back pressure is interlocked: the cathode and anode electrolytes are fed and circulated separately through two circulation pumps, and the cathode and anode water-gas separators are connected; water is replenished on both sides of the cathode and anode or on one side alone; The cathode and anode are back-pressed simultaneously; S5. The cathode and anode are fed with liquid together and the back pressure is interlocked: the cathode and anode electrolytes share a circulating pump for liquid circulation, and the cathode and anode water-gas separators are connected; water is replenished on both sides of the cathode and anode or on one side alone; the cathode and anode are back-pressured at the same time.

6. The control method of the AEM electrolyzer testing device according to claim 5, characterized in that: The control method of the single anode liquid feeding and the cathode liquid not feeding is specifically as follows: S1.

1. The anode water vapor separator (2) serves as a main water tank, storing a certain amount of electrolyte, wherein the electrolyte is a 1M KOH solution by mass fraction; S1.

2. Open the anode liquid inlet valve (64) and the anode circulation pipeline valve (60), and close the cathode liquid inlet valve (65), the cathode circulation pipeline valve (62), the connecting valve (66), the cathode alkali solution distribution valve (67), and the anode alkali solution confluence valve (68); S1.

3. Start the anode circulation pump (4), the electrolyte is pumped from the anode water vapor separator (2) into the electrolytic cell, water is electrolyzed in the electrolytic cell, and the circulation flow rate is calculated according to the number of electrolysis; turn on the anode radiator (5) to maintain the electrolytic cell temperature at 60 to 90 ° C; S1.

4. The anode produces oxygen, which enters the anode water vapor separator (2) together with the electrolyte. After gravity separation, the oxygen is discharged from the upper port, washed by a water scrubber to remove alkali, condensed by a condenser to remove water, and finally emptied or collected; S1.

5. The liquid in the anode scrubber (10) and the anode drip collector (12) is regularly discharged into the anode water vapor separator (2) for recirculation; S1.

6. According to the liquid level change of the anode water vapor separator (2), water is regularly replenished to the oxygen separator through the water replenishment pump, and the amount of water replenishment is calculated based on the amount of electrolyzed water; S1.

7. The hydrogen generated at the cathode enters the cathode water vapor separator (3). After gravity separation, the hydrogen goes out from the upper port, is washed and de-alkalied by the cathode water washer (13), condensed and dehydrated by the condenser, and finally enters the purification system (50) for purification or discharge and collection; S1.

8. The liquid in the cathode water washer (13) and the cathode drip collector (15) is regularly discharged into the cathode water washing separator (3), and the water in the cathode water vapor separator (3) is regularly discharged into the wastewater pipe (20).

7. The control method of the AEM electrolyzer testing device according to claim 5, characterized in that: The control method of the single cathode liquid feeding and the anode liquid not feeding is specifically as follows: S2.

1. The cathode water vapor separator (3) serves as a main water tank, storing a certain amount of electrolyte, wherein the electrolyte is a 1M KOH solution by mass fraction; S2.

2. Open the cathode liquid inlet valve (65) and the cathode circulation pipeline valve (62), and close the anode liquid inlet valve (64), the anode circulation pipeline valve (60), the connecting valve (66), the cathode alkali solution distribution valve (67), and the anode alkali solution confluence valve (68); S2.

3. Start the cathode circulation pump (7), the electrolyte is pumped from the cathode water vapor separator (3) into the electrolytic cell, water is electrolyzed in the electrolytic cell, and the circulation flow rate is calculated according to the number of electrolysis; turn on the cathode radiator (8) to maintain the electrolytic cell temperature at 60 to 90 ° C; S2.

4. The oxygen generated at the anode enters the anode water vapor separator (2). After gravity separation, the oxygen is discharged from the upper port, washed by a water scrubber to remove alkali, condensed by a condenser to remove water, and finally emptied or collected; S2.

5. The liquid in the anode water washer (10) and the anode drip collector (12) is regularly discharged into the anode water vapor separator (2), and the water in the anode water vapor separator (2) is regularly discharged to the wastewater pipe (20); S2.

6. The hydrogen generated at the cathode enters the cathode water vapor separator (3). After gravity separation, the hydrogen goes out from the upper port, is washed and de-alkalied by the cathode water washer (13), condensed and dehydrated by the condenser, and finally enters the purification system (50) for purification or discharge and collection; S2.

7. The liquid in the cathode water washer (13) and the cathode drip collector (15) is regularly discharged into the cathode water vapor separator (3) for recirculation; S2.

8. According to the change of the liquid level of the cathode water vapor separator (3), water is regularly replenished to the cathode water vapor separator (3) through a water replenishment pump, and the amount of replenished water is calculated based on the amount of electrolyzed water.

8. The control method of the AEM electrolyzer testing device according to claim 5, characterized in that: The specific method for controlling the independent back pressure of the cathode and anode while the liquid is introduced simultaneously is as follows: S3.

1. The anode water vapor separator (2) and the cathode water vapor separator (3) are both used as main water tanks to store a certain amount of electrolyte, and the electrolyte is a 1M KOH solution; S3.

2. Open the anode liquid inlet valve (64), cathode liquid inlet valve (65), anode circulation pipeline valve (60), cathode circulation pipeline valve (62), close the connecting valve (66), cathode alkali solution distribution valve (67), and anode alkali solution confluence valve (68); S3.

3. The anode circulation pump (4) and cathode circulation pump (7) are respectively started, and the electrolyte is pumped into the electrolytic cell from the anode water vapor separator (2) and the cathode water vapor separator (3), and water is electrolyzed in the electrolytic cell. The circulation flow rate is calculated according to the amount of electrolysis; the anode radiator (5) and the cathode radiator (8) are turned on to maintain the electrolytic cell temperature at 60 to 90°C; S3.

4. The anode produces oxygen, which enters the anode water vapor separator (2) together with the electrolyte. After gravity separation, the oxygen is discharged from the upper port, washed by a water scrubber to remove alkali, condensed by a condenser to remove water, and finally emptied or collected; S3.

5. The liquid in the anode scrubber (10) and the anode drip collector (12) is regularly discharged into the anode water vapor separator (2) and recirculated; S3.

6. According to the change in the alkali concentration in the anode water vapor separator (2), alkali is added to the anode water vapor separator (2) by the alkali replenishing pump to maintain the alkali concentration in the anode water vapor separator (2); S3.

7. The cathode produces hydrogen, which enters the cathode water vapor separator (3) together with the electrolyte. After gravity separation, the hydrogen goes out from the upper port, is washed by a water scrubber to remove alkali, condensed by a condenser to remove water, and finally enters the purification system (50) for purification or discharge and collection; S3.

8. The liquid in the cathode water washer (13) and the cathode drip collector (15) is regularly discharged into the cathode water vapor separator (3) and recirculated; S3.

9. According to the change of the liquid level of the cathode water vapor separator (3), water is regularly replenished to the cathode water vapor separator (3) through a water replenishment pump, and the replenishment amount is calculated based on the amount of electrolyzed water.

9. The control method of the AEM electrolyzer testing device according to claim 5, characterized in that: The cathode and anode are fed with liquid separately at the same time, and the control method of interlocking back pressure is specifically as follows: S4.

1. The anode water vapor separator (2) and the cathode water vapor separator (3) are both used as main water tanks to store a certain amount of electrolyte, wherein the electrolyte is a 1M KOH solution; S4.

2. Open the anode liquid inlet valve (64), cathode liquid inlet valve (65), anode circulation pipeline valve (60), cathode circulation pipeline valve (62), and connecting valve (66), and close the cathode alkali solution distribution valve (67) and the anode alkali solution confluence valve (68); S4.

3. Start the anode and cathode circulation pumps respectively, and the electrolyte is pumped into the electrolytic cell from the anode and cathode water vapor separators respectively. Water is electrolyzed in the electrolytic cell, and the circulation flow rate is calculated according to the amount of electrolysis; turn on the anode and cathode radiators to maintain the electrolytic cell temperature at 60-90°C; S4.

4. The anode produces oxygen, which enters the anode water vapor separator (2) together with the electrolyte. After gravity separation, the oxygen is discharged from the upper port, washed by a water scrubber to remove alkali, condensed by a condenser to remove water, and finally emptied or collected; S4.

5. The liquid in the anode scrubber (10) and the anode drip collector (12) is regularly discharged into the anode water vapor separator (2) and recirculated; S4.

6. The cathode produces hydrogen, which enters the cathode water vapor separator (3) together with the electrolyte. After gravity separation, the hydrogen goes out from the upper port, is washed by a water scrubber to remove alkali, condensed by a condenser to remove water, and finally enters the purification system (50) for purification or discharge and collection; S4.

7. The liquid in the cathode water washer (13) and the cathode drip collector (15) is regularly discharged into the cathode water vapor separator (3) and recirculated; S4.

8. According to the changes in the liquid levels of the cathode and anode water vapor separators, water is regularly replenished to the cathode / anode water vapor separators through the water replenishment pump, and the amount of water replenishment is calculated based on the amount of electrolyzed water.

10. The control method of the AEM electrolyzer testing device according to claim 5, characterized in that: The cathode and anode both feed liquid and the interlocking back pressure control method is specifically as follows: S5.

1. The anode water vapor separator (2) and the cathode water vapor separator (3) are both used as main water tanks to store a certain amount of electrolyte, wherein the electrolyte is a 1M KOH solution; S5.

2. Open the anode liquid inlet valve (64), cathode liquid inlet valve (65), anode circulation pipeline valve (60), cathode circulation pipeline valve (62), connecting vessel valve (66), cathode alkali solution distribution valve (67), and anode alkali solution confluence valve (68); S5.

3. Start the cathode circulation pump (7), the electrolyte is pumped into the electrolytic cell from the anode and cathode water vapor separators, water is electrolyzed in the electrolytic cell, and the circulation flow rate is calculated according to the number of electrolysis; open the anode and cathode radiators to maintain the electrolytic cell temperature at 60 to 90 ° C; S5.

4. The anode produces oxygen, which enters the anode water vapor separator (2) along with the electrolyte. After gravity separation, the oxygen is discharged from the upper port, washed by a water scrubber to remove alkali, condensed by a condenser to remove water, and finally emptied or collected; S5.

5. The liquid in the anode scrubber (10) and the anode drip collector (12) is regularly discharged into the anode water vapor separator (2) and recirculated; S5.

6. The cathode produces hydrogen, which enters the cathode water vapor separator (3) together with the electrolyte. After gravity separation, the hydrogen leaves from the upper port, is washed by a water scrubber to remove alkali, condensed by a condenser to remove water, and finally enters the purification system (50) for purification or discharge and collection; S5.

7. The liquid in the cathode water washer (13) and the cathode drip collector (15) is regularly discharged into the cathode water vapor separator (3) and recirculated; S5.

8. According to the changes in the liquid levels of the cathode and anode water vapor separators, water is regularly replenished to the cathode / anode water vapor separators through the water replenishment pump, and the amount of water replenishment is calculated based on the amount of electrolyzed water.

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