Many-for-one water electrolysis hydrogen production system with single electrolytic cell capable of independently operating

Abstract

The invention discloses a many-for-one water electrolysis hydrogen production system and method with a single electrolytic cell capable of independently operating. The system comprises a set of hydrogen / oxygen separator and at least two alkali liquor circulating units, each alkali liquor circulating unit comprises an alkali liquor circulating pump, an alkali liquor cooler and an alkali electrolytic bath which are sequentially connected between the outlet and the inlet of the hydrogen / oxygen separator, and a starting film regulating valve connected with the alkali liquor cooler; the film adjusting valve is used for adjusting the flow of cooling water in the alkali liquor cooler; hydrogen and oxygen generated by the alkaline electrolytic bath in each alkaline liquor circulating unit enter a hydrogen / oxygen separator along with the alkaline liquor under the lift action of an alkaline liquor circulating pump, and are separated from the alkaline liquor under the action of gravity; and the separated alkali liquor flows back to the alkaline electrolytic bath through an alkali liquor circulating pump and an alkali liquor cooler. The multiple electrolytic cells can operate under different loads and different temperatures, the operation load range of the water electrolysis hydrogen production system is widened, and the system is more suitable for wind and light fluctuation power source hydrogen production.

Description

Technical Field

[0001] The present invention belongs to the technical field of water electrolysis hydrogen production, and in particular relates to a many-to-one water electrolysis hydrogen production system and method in which a single electrolyzer can operate independently. Background Art

[0002] With the substantial increase in installed capacity of renewable energy such as wind power and photovoltaics, 100-megawatt or 1-gigawatt water electrolysis hydrogen production projects have been started one after another. It is crucial to develop low-cost, high-efficiency, large-scale alkaline water electrolysis hydrogen production equipment.

[0003] For large-scale water electrolysis hydrogen production projects, a one-to-many mode alkaline water electrolysis hydrogen production equipment is designed based on factors such as reducing costs and floor space, that is, multiple electrolyzers correspond to one gas-liquid separation system and one purification system. However, the existing one-to-many mode alkaline water electrolysis hydrogen production equipment cannot meet the needs of independent and precise control of a single electrolyzer, resulting in a long control and adjustment time for the hydrogen production system matched with wind and solar fluctuating power sources, a narrow operating load range, and low operating efficiency.

[0004] Therefore, it is urgent to develop a many-to-one water electrolysis hydrogen production system in which a single electrolyzer can operate independently to meet the needs of large-scale renewable energy water electrolysis hydrogen production projects. Summary of the invention

[0005] In order to address the deficiencies in the prior art, the present invention provides a many-to-one water electrolysis hydrogen production system and method in which a single electrolyzer can operate independently, so that each alkaline electrolyzer can adjust its operating load, temperature and alkali solution flow rate according to the fluctuating power of wind and solar power, thereby avoiding shutdown caused by mismatch between the operating temperature of a single electrolyzer and the power load during system operation, effectively reducing the control and adjustment time of the hydrogen production system, broadening the operating load range of the hydrogen production system, and improving the hydrogen production efficiency.

[0006] The present invention adopts the following technical solution.

[0007] According to a first aspect of the present invention, a multi-to-one water electrolysis hydrogen production system is provided in which a single electrolyzer can operate independently. The system includes a set of hydrogen / oxygen separators and at least two alkali solution circulation units;

[0008] Each alkali solution circulation unit comprises an alkali solution circulation pump, an alkali solution cooler and an alkaline electrolytic cell connected in sequence between the outlet and the inlet of the hydrogen / oxygen separator, and a start-up membrane regulating valve connected to the alkali solution cooler;

[0009] The alkali solution circulation pump is used to circulate the alkali solution in the corresponding alkali solution circulation unit;

[0010] The alkali liquid cooler is used to cool the alkali liquid in the corresponding alkali liquid circulation unit;

[0011] The film regulating valve is used to adjust the flow rate of cooling water in the alkali liquid cooler;

[0012] Among them, the hydrogen and oxygen produced by the alkaline electrolytic cell in each alkali solution circulation unit enter the hydrogen / oxygen separator along with the alkali solution under the action of the alkali solution circulation pump, and are separated from the alkali solution under the action of gravity; the separated alkali solution flows back to the alkaline electrolytic cell through the alkali solution circulation pump and the alkali solution cooler.

[0013] Preferably, the rated power of each alkaline electrolyzer is the same and is 10 kW to 5 MW.

[0014] Preferably, it also includes a spare alkali solution circulation pump, the inlet of which is connected to the hydrogen / oxygen separator, and the outlet of which is connected to the alkali solution cooler in each alkali solution circulation unit.

[0015] Preferably, the flow rate of each alkali solution circulation pump is 1m 3 / h~80m 3 / h.

[0016] Preferably, the heat exchange of each alkali liquid cooler is 0-40m 2 .

[0017] Preferably, the adjustment range of each pneumatic diaphragm regulating valve is 0 to 320 m 3 / h.

[0018] Preferably, the set of hydrogen / oxygen separators comprises a separate hydrogen separator and an oxygen separator; the volumes of the hydrogen separator and the oxygen separator are 0.01m 3 ~10m 3 .

[0019] Preferably, the system further comprises:

[0020] The controller is used to obtain the actual wind and solar power fluctuation input power, the wind and solar power fluctuation input power when all alkaline electrolyzers are operating at rated power at the same time, the real-time flow of the alkali liquid circulation pump in each alkali liquid circulation unit and the real-time temperature of the alkaline electrolyzer, and control the start and stop of each alkaline electrolyzer, the flow of the alkali liquid circulation pump and the opening of the membrane regulating valve according to the obtained results.

[0021] According to a second aspect of the present invention, a method for producing hydrogen by electrolysis of water in which a single electrolyzer can operate independently is provided, the method utilizing the system as described in the first aspect of the present invention. The system comprises the following steps:

[0022] Get the actual wind and solar power fluctuation input power P 实 、Wind and solar power fluctuation input power P when all alkaline electrolyzers are running at rated power at the same time 总and the real-time flow rate of the alkali solution circulation pump and the real-time temperature of the alkaline electrolytic cell in each alkali solution circulation unit;

[0023] The start and stop of each alkaline electrolytic cell, the flow rate of the alkali solution circulation pump and the opening of the membrane regulating valve are controlled according to the obtained results.

[0024] Preferably, the start and stop of each alkaline electrolytic cell, the flow rate of the alkali solution circulation pump and the opening of the membrane regulating valve are controlled according to the obtained results, including:

[0025] when When the alkali solution circulation unit is activated, the alkaline electrolytic cells in all alkali solution circulation units are activated at the same time. By controlling the flow rate of the alkali solution circulation pump and the opening of the membrane regulating valve, the alkali solution flow rate and the electrolytic cell temperature in each alkali solution circulation unit are 50% Q 总 ~Q 总 With 70% T 总 ~T 总 , where N is the number of alkali solution circulation units, Q 总 and T 总 They are the maximum alkali flow rate of each circulation system and the maximum temperature of a single electrolytic cell;

[0026] when When the alkali electrolyte is activated, only one electrolytic cell is activated and the other electrolytic cells are deactivated. By controlling the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve, the alkali liquid flow rate of the activated alkaline electrolytic cell corresponding to the alkali liquid circulation unit and the temperature of the alkaline electrolytic cell are 50% Q 总 ~Q 总 With 70% T 总 ~T 总 , and the alkali flow rate of the alkali circulation unit corresponding to the deactivated alkaline electrolytic cell is 50% Q 总 ;

[0027] when When the alkali electrolyte is turned off, all alkaline electrolytic cells are stopped to put the system in a shutdown state. By controlling the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve, the alkali liquid flow rate of each alkali liquid circulation unit is 50% Q 总 .

[0028] The beneficial effect of the present invention lies in that, compared with the prior art, by configuring a set of hydrogen / oxygen separators and at least two alkali liquid circulation units, and making each alkali liquid circulation unit include an alkali liquid circulation pump, an alkali liquid cooler and an alkaline electrolyzer connected in sequence between the outlet and the inlet of the hydrogen / oxygen separator, and a starting membrane regulating valve connected to the alkali liquid cooler, the problems of low operating efficiency, narrow operating load range and poor matching with wind and solar fluctuating power sources in the existing many-to-one hydrogen production system are solved. By adjusting the alkali liquid circulation pump and the pneumatic membrane regulating valve of the cooling water circuit, independent temperature control and different load operation of a single electrolyzer are achieved, which broadens the operating load range of the electrolytic water hydrogen production system, is more suitable for hydrogen production from wind and solar fluctuating power sources, can ensure the safe operation of the new energy electrolytic water hydrogen production system, and provide favorable support for the implementation of large-scale new energy electrolytic water hydrogen production projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a process flow chart of a many-to-one water electrolysis hydrogen production system in which a single electrolyzer can operate independently, as proposed by one embodiment of the present invention.

[0030] Figure 1 ①-⑤ in the middle are alkali liquid circulation pumps 1 to 5; ⑥-⑨ are alkali liquid coolers 1 to 4; ⑩- It is a pneumatic diaphragm regulating valve 1 to a starting diaphragm regulating valve 4; Alkaline electrolytic cell 1 to alkaline electrolytic cell 4; A hydrogen separator; An oxygen separator. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, not all embodiments. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present utility model.

[0032] According to a first aspect of the present invention, a many-to-one water electrolysis hydrogen production system is provided in which a single electrolyzer can operate independently.

[0033] like Figure 1 As shown, in one embodiment, the many-to-one water electrolysis hydrogen production system of the present invention in which a single electrolyzer can operate independently includes a set of hydrogen / oxygen separators, 4 alkali solution circulation units and a spare alkali solution circulation pump.

[0034] Each alkali solution circulation unit comprises an alkali solution circulation pump, an alkali solution cooler and an alkaline electrolytic cell which are sequentially connected between the outlet and the inlet of the hydrogen / oxygen separator, and a start-up membrane regulating valve connected to the alkali solution cooler.

[0035] The alkali inlet of each electrolytic cell is connected to the alkali cooler, and the gas-liquid two-phase outlet is connected to the hydrogen / oxygen separator. The hydrogen / oxygen generated by the electrolytic cell enters the hydrogen / oxygen separator under the action of the alkali circulation pump.

[0036] The inlet of each alkali solution circulation pump is connected with the hydrogen / oxygen separator, and the outlet is connected with the corresponding alkali solution cooler, so as to circulate the alkali solution in the corresponding alkali solution circulation unit.

[0037] The inlet of each alkali solution cooler is connected to the alkali solution circulation pump, and the outlet is connected to the electrolytic cell, so as to cool the alkali solution in the corresponding alkali solution circulation unit.

[0038] The outlet of each pneumatic diaphragm regulating valve is connected to the alkali liquid cooler and is used to adjust the cooling water flow in the alkali liquid cooler.

[0039] Hydrogen / oxygen separator including separate hydrogen separator Oxygen separator Hydrogen / oxygen separator and alkaline electrolyzer 1 to alkaline electrolyzer 4 in 4 alkali solution circulation units The alkali liquid circulation pump 1 is connected to the alkali liquid circulation pump 4 ①-④, and is used to separate the alkali liquid and the hydrogen and oxygen in the alkali liquid.

[0040] The inlet of the standby alkali solution circulation pump ⑤ is connected to the hydrogen / oxygen separator, and the outlet is respectively connected to the alkali solution cooler 1 to the alkali solution cooler 4 ⑥-⑨ in each alkali solution circulation unit.

[0041] It should be noted that, although the number of alkali liquid circulation units in this embodiment is 4, in other embodiments, the number of alkali liquid circulation units can also be set to other numbers, preferably 2 to 8, and accordingly, the total number of alkali liquid circulation pumps including the spare alkali liquid circulation pump is preferably 3 to 9. It should be noted that, in some embodiments, the spare alkali liquid circulation pump is not necessary and can be removed, but adding a spare circulation pump helps to improve the stability of the entire water electrolysis hydrogen production system.

[0042] In a preferred but non-limiting embodiment, the rated power of each alkaline electrolyzer is the same and is 10 kW to 5 MW.

[0043] Preferably, the flow rate of each alkali solution circulation pump is 1m 3 / h~80m 3 / h.

[0044] Preferably, the heat exchange of each alkali liquid cooler is 0-40m 2 .

[0045] Preferably, the adjustment range of each pneumatic diaphragm regulating valve is 0 to 320m 3 / h.

[0046] Preferably, the volumes of the hydrogen separator and the oxygen separator are 0.01 m 3 ~10m 3 .

[0047] like Figure 1 The specific process flow of the water electrolysis hydrogen production system of the present invention is as follows: alkaline electrolysis cell 1 to alkaline solution electrolysis cell 4 The generated hydrogen and oxygen enter the hydrogen separator under the action of the corresponding alkali liquid circulation pump 1 to alkali liquid circulation pump 4①-④ Oxygen separator Under the action of gravity, the alkali solution flows back, and then enters the corresponding alkali solution cooler 1 to alkali solution cooler 6-9 through the corresponding alkali solution circulation pump 1 to alkali solution circulation pump 4①-④, and finally flows back to the alkaline electrolytic cell.

[0048] In this embodiment, by configuring a set of hydrogen / oxygen separators and at least two alkali liquid circulation units, and making each alkali liquid circulation unit include an alkali liquid circulation pump, an alkali liquid cooler and an alkaline electrolyzer connected in sequence between the outlet and the inlet of the hydrogen / oxygen separator, and a starting membrane regulating valve connected to the alkali liquid cooler, the problems of low operating efficiency, narrow operating load range and poor matching with wind and solar fluctuating power sources in the existing many-to-one hydrogen production system are solved. By adjusting the alkali liquid circulation pump and the cooling water circuit pneumatic membrane regulating valve, independent temperature control and different load operation of a single electrolyzer are achieved, which broadens the operating load range of the electrolytic water hydrogen production system, is more suitable for hydrogen production from wind and solar fluctuating power sources, can ensure the safe operation of the new energy electrolytic water hydrogen production system, and provide favorable support for the implementation of large-scale new energy electrolytic water hydrogen production projects.

[0049] Preferably, in other embodiments, the single electrolyzer of the present invention can independently operate the many-to-one water electrolysis hydrogen production system may also include a controller. The controller is used to obtain the actual wind and solar power fluctuation input power, the wind and solar power fluctuation input power when all alkaline electrolyzers are running at rated power at the same time, the real-time flow rate of the alkali liquid circulation pump in each alkali liquid circulation unit and the real-time temperature of the alkaline electrolyzer, and control the start and stop of each alkaline electrolyzer, the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve according to the obtained results. In this way, automatic intelligent regulation of the water electrolysis hydrogen production system can be achieved.

[0050] According to a second aspect of the present invention, a method for producing hydrogen by electrolysis of water in which a single electrolyzer can operate independently is provided. The method utilizes the system for producing hydrogen by electrolysis of water in which a single electrolyzer can operate independently as described in the first aspect of the present invention. Specifically, the method comprises the following steps:

[0051] Step 1: Obtain the actual wind and solar power fluctuation input power P 实、Wind and solar power fluctuation input power P when all alkaline electrolyzers are running at rated power at the same time 总 As well as the real-time flow rate of the alkali solution circulation pump in each alkali solution circulation unit and the real-time temperature of the alkaline electrolytic cell.

[0052] Step 2: Control the start and stop of each alkaline electrolytic cell, the flow rate of the alkali solution circulation pump and the opening of the membrane regulating valve according to the obtained results.

[0053] Specifically, the step includes:

[0054] when When the alkali solution circulation unit is activated, the alkaline electrolytic cells in all alkali solution circulation units are activated at the same time. By controlling the flow rate of the alkali solution circulation pump and the opening of the membrane regulating valve, the alkali solution flow rate and the electrolytic cell temperature in each alkali solution circulation unit are 50% Q 总 ~Q 总 With 70% T 总 ~T 总 , where N is the number of alkali solution circulation units, Q 总 and T 总 They are the maximum alkali flow rate of each circulation system and the maximum temperature of a single electrolytic cell;

[0055] when When the alkali electrolyte is activated, only one electrolytic cell is activated and the other electrolytic cells are deactivated. By controlling the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve, the alkali liquid flow rate of the activated alkaline electrolytic cell corresponding to the alkali liquid circulation unit and the temperature of the alkaline electrolytic cell are 50% Q 总 ~Q 总 With 70% T 总 ~T 总 , and the alkali flow rate of the alkali circulation unit corresponding to the deactivated alkaline electrolytic cell is 50% Q 总 ;

[0056] when When the alkali electrolyte is turned off, all alkaline electrolytic cells are stopped to put the system in a shutdown state. By controlling the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve, the alkali liquid flow rate of each alkali liquid circulation unit is 50% Q 总 .

[0057] More specifically, a four-to-one water electrolysis hydrogen production system in which a single electrolyzer including four alkali solution circulation units can operate independently is taken as an example:

[0058] when That is, P 实 ≥25%P 总 When the alkali solution circulation unit is activated, the alkaline electrolytic cells in all alkali solution circulation units are activated at the same time. By controlling the flow rate of the alkali solution circulation pump and the opening of the membrane regulating valve, the alkali solution flow rate and the electrolytic cell temperature in each alkali solution circulation unit are 50% Q 总~Q 总 With 70% T 总 ~T 总 ;

[0059] When 6.25%P 总 ≤P 实 <25%P 总 When the alkali electrolyte is activated, only one electrolytic cell is activated and the other electrolytic cells are deactivated. By controlling the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve, the alkali liquid flow rate of the activated alkaline electrolytic cell corresponding to the alkali liquid circulation unit and the temperature of the alkaline electrolytic cell are 50% Q 总 ~Q 总 With 70% T 总 ~T 总 , and the alkali flow rate of the alkali circulation unit corresponding to the deactivated alkaline electrolytic cell is 50% Q 总 ;

[0060] When P 实 <6.25%P 总 When the alkali electrolyte is turned off, all alkaline electrolytic cells are stopped to put the system in a shutdown state. By controlling the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve, the alkali liquid flow rate of each alkali liquid circulation unit is 50% Q 总 .

[0061] It should be noted that there is still alkali solution flowing in the deactivated alkaline electrolytic cell, but since the electrolytic cell no longer performs electrolysis reaction, the alkali solution in the corresponding alkali solution circulation unit will gradually decrease in temperature over time under the action of cooling water in the alkali solution cooler.

[0062] In this embodiment, the temperature of the alkaline electrolytic cell in a single alkali solution circulation unit can be accurately controlled by the corresponding alkali solution cooler, and the temperature of a single electrolytic cell can be controlled by adjusting the opening of each corresponding pneumatic membrane regulating valve; the flow rate of the alkaline electrolytic cell in a single circulation system can be automatically controlled by a variable frequency alkali solution circulation pump according to the temperature and operating load of the electrolytic cell, so that each electrolytic cell can operate at different loads and temperatures. 实 <6.25%P 总 In this way, the operating load range can be effectively broadened, the system operating efficiency can be improved, and the system operating safety can be guaranteed. It is more suitable for hydrogen production projects with wind and solar fluctuation power sources of 100 megawatts and gigawatts.

[0063] Finally, it should be noted that the above invention is only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A multi-to-one water electrolysis hydrogen production system in which a single electrolyzer can operate independently, characterized in that it includes a set of hydrogen / oxygen separators and at least two alkali solution circulation units; Each alkali solution circulation unit comprises an alkali solution circulation pump, an alkali solution cooler and an alkaline electrolytic cell connected in sequence between the outlet and the inlet of the hydrogen / oxygen separator, and a start-up membrane regulating valve connected to the alkali solution cooler; The alkali solution circulation pump is used to circulate the alkali solution in the corresponding alkali solution circulation unit; The alkali liquid cooler is used to cool the alkali liquid in the corresponding alkali liquid circulation unit; The film regulating valve is used to adjust the flow rate of cooling water in the alkali liquid cooler; in, The hydrogen and oxygen produced by the alkaline electrolytic cell in each alkali solution circulation unit enter the hydrogen / oxygen separator along with the alkali solution under the action of the alkali solution circulation pump, and are separated from the alkali solution under the action of gravity; The separated alkali solution flows back to the alkaline electrolytic cell through the alkali solution circulation pump and the alkali solution cooler.

2. The many-to-one water electrolysis hydrogen production system with a single electrolyzer capable of operating independently according to claim 1 is characterized in that: The rated power of each alkaline electrolyzer is the same and ranges from 10kW to 5MW.

3. The many-to-one water electrolysis hydrogen production system with a single electrolyzer capable of operating independently according to claim 1 is characterized in that: It also includes a spare alkali solution circulation pump, the inlet of which is connected to the hydrogen / oxygen separator, and the outlet of which is connected to the alkali solution cooler in each alkali solution circulation unit.

4. The many-to-one water electrolysis hydrogen production system with a single electrolyzer capable of operating independently according to claim 1 or 3, characterized in that: The flow rate of each alkali solution circulation pump is 1m 3 / h~80m 3 / h.

5. The many-to-one water electrolysis hydrogen production system with a single electrolyzer capable of operating independently according to claim 1 is characterized in that: The heat exchange of each alkali liquid cooler is 0~40m 2 .

6. The many-to-one water electrolysis hydrogen production system with a single electrolyzer capable of operating independently according to claim 1 is characterized in that: The adjustment range of each pneumatic diaphragm regulating valve is 0~320m 3 / h.

7. The many-to-one water electrolysis hydrogen production system with a single electrolyzer capable of operating independently according to claim 1 is characterized in that: The set of hydrogen / oxygen separators includes a separate hydrogen separator and an oxygen separator; the volumes of the hydrogen separator and the oxygen separator are 0.01m 3 ~10m 3 .

8. The many-to-one water electrolysis hydrogen production system with a single electrolyzer capable of operating independently according to claim 1 is characterized in that: Also includes: The controller is used to obtain the actual wind and solar power fluctuation input power, the wind and solar power fluctuation input power when all alkaline electrolyzers are operating at rated power at the same time, the real-time flow of the alkali liquid circulation pump in each alkali liquid circulation unit and the real-time temperature of the alkaline electrolyzer, and control the start and stop of each alkaline electrolyzer, the flow of the alkali liquid circulation pump and the opening of the membrane regulating valve according to the obtained results.

9. A method for producing hydrogen by electrolysis of water in which a single electrolyzer can operate independently, using the system as claimed in any one of claims 1 to 8, characterized in that: The steps include: Get the actual wind and solar power fluctuation input power P 实 、Wind and solar power fluctuation input power P when all alkaline electrolyzers are running at rated power at the same time 总 and the real-time flow rate of the alkali solution circulation pump and the real-time temperature of the alkaline electrolytic cell in each alkali solution circulation unit; The start and stop of each alkaline electrolytic cell, the flow rate of the alkali solution circulation pump and the opening of the membrane regulating valve are controlled according to the obtained results.

10. The method for producing hydrogen by electrolysis of water in many-to-one manner with a single electrolyzer capable of operating independently according to claim 9, characterized in that: According to the obtained results, the start and stop of each alkaline electrolytic cell, the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve are controlled, including: when When the alkali solution circulation unit is activated, the alkaline electrolytic cells in all alkali solution circulation units are activated at the same time. By controlling the flow rate of the alkali solution circulation pump and the opening of the membrane regulating valve, the alkali solution flow rate and the electrolytic cell temperature in each alkali solution circulation unit are 50% Q 总 ~Q 总 With 70% T 总 ~T 总 , where N is the number of alkali solution circulation units, Q 总 and T 总 They are the maximum alkali flow rate of each circulation system and the maximum temperature of a single electrolytic cell; when When the alkali electrolyte is activated, only one electrolytic cell is activated and the other electrolytic cells are deactivated. By controlling the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve, the alkali liquid flow rate of the activated alkaline electrolytic cell corresponding to the alkali liquid circulation unit and the temperature of the alkaline electrolytic cell are 50% Q 总 ~Q 总 With 70% T 总 ~T 总 , and the alkali flow rate of the alkali circulation unit corresponding to the deactivated alkaline electrolytic cell is 50% Q 总 ; when When the alkali electrolyte is turned off, all alkaline electrolytic cells are stopped to put the system in a shutdown state. By controlling the flow rate of the alkali liquid circulation pump and the opening of the membrane regulating valve, the alkali liquid flow rate of each alkali liquid circulation unit is 50% Q 总 .

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