Water electrolysis hydrogen production device suitable for renewable energy source volatility

Abstract

The invention provides a water electrolysis hydrogen production device suitable for renewable energy source volatility. The water electrolysis hydrogen production device comprises renewable energy source power supply and distribution equipment, an electrolytic cell, a first gas phase header pipe used for collecting an anode gas phase of the electrolytic cell, a second gas phase header pipe used for collecting a cathode gas phase of the electrolytic cell and a controller. The electrolytic cell and the controller are electrically connected with the renewable energy power supply and distribution equipment, a first regulating valve and a second regulating valve are arranged on the first gas-phase header pipe in parallel, a third regulating valve and a fourth regulating valve are arranged on the second gas-phase header pipe in parallel, and the caliber of the first regulating valve is larger than that of the second regulating valve; the caliber of the third adjusting valve is larger than that of the fourth adjusting valve, and the first adjusting valve, the second adjusting valve, the third adjusting valve and the fourth adjusting valve are all electrically connected with the controller. And a structural basis is provided for adapting to the volatility of renewable energy power generation and adjusting the oxygen pressure, the hydrogen pressure and the pressure difference in the device.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen production by electrolysis of water, and in particular to a hydrogen production device by electrolysis of water suitable for the volatility of renewable energy. Background Art

[0002] In order to achieve clean and low-carbon development of the hydrogen energy industry throughout its entire life cycle, renewable energy hydrogen production technology has been proposed. That is, using renewable energy (such as solar energy, wind energy, etc.) to generate electricity to provide power for water electrolysis hydrogen production equipment, thereby achieving green and efficient hydrogen production.

[0003] However, compared with thermal and nuclear power generation resources, renewable power generation resources (such as wind power generation, photovoltaic power generation, etc.) are affected by natural climate and have certain volatility. Therefore, using renewable energy to generate electricity for water electrolysis hydrogen production equipment will cause oscillations and fluctuations in the oxygen pressure, hydrogen pressure and pressure difference in the water electrolysis hydrogen production equipment, thereby affecting the overall stability of the water electrolysis hydrogen production equipment and reducing the hydrogen production efficiency and quality.

[0004] Therefore, there is an urgent need for a water electrolysis hydrogen production device that is suitable for the volatility of renewable energy. Summary of the invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a water electrolysis hydrogen production device suitable for the volatility of renewable energy power generation, which provides a structural basis for adjusting the oxygen pressure, hydrogen pressure and pressure difference in the device to adapt to the volatility of renewable energy power generation.

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0007] The present invention provides a water electrolysis hydrogen production device suitable for renewable energy volatility, comprising renewable energy power supply and distribution equipment, an electrolyzer, a first gas phase main pipe for collecting anode gas phase of the electrolyzer, a second gas phase main pipe for collecting cathode gas phase of the electrolyzer, and a controller; the electrolyzer and the controller are both electrically connected to the renewable energy power supply and distribution equipment, a first regulating valve and a second regulating valve are arranged in parallel on the first gas phase main pipe, a third regulating valve and a fourth regulating valve are arranged in parallel on the second gas phase main pipe, the caliber of the first regulating valve is larger than the caliber of the second regulating valve, the caliber of the third regulating valve is larger than the caliber of the fourth regulating valve, and the first regulating valve, the second regulating valve, the third regulating valve and the fourth regulating valve are all electrically connected to the controller.

[0008] Optionally, the caliber of the second regulating valve is 20% to 80% of the caliber of the first regulating valve, and the caliber of the fourth regulating valve is 20% to 80% of the caliber of the third regulating valve.

[0009] Optionally, the electrolysis water hydrogen production device suitable for renewable energy volatility also includes an anode gas-liquid separator, a cathode gas-liquid separator, an anode liquid circulation tank and a cathode liquid circulation tank; the anode chamber outlet of the electrolyzer is connected to the inlet of the anode gas-liquid separator, the gas phase outlet of the anode gas-liquid separator is connected to the first gas phase main pipe, the liquid phase outlet of the anode gas-liquid separator is connected to the liquid phase inlet of the anode liquid circulation tank, the gas phase outlet of the anode liquid circulation tank is connected to the first gas phase main pipe, the cathode chamber outlet of the electrolyzer is connected to the inlet of the cathode gas-liquid separator, the gas phase outlet of the cathode gas-liquid separator is connected to the second gas phase main pipe, the liquid phase outlet of the cathode gas-liquid separator is connected to the liquid phase inlet of the cathode liquid circulation tank, the gas phase outlet of the cathode liquid circulation tank is connected to the second gas phase main pipe, the liquid phase outlet located at the bottom of the anode liquid circulation tank is connected to the liquid phase outlet located at the bottom of the cathode liquid circulation tank through at least one connecting pipe, and the anode chamber inlet of the electrolyzer and the cathode chamber inlet of the electrolyzer are respectively connected to the connecting pipe.

[0010] Optionally, a first liquid level meter is provided in the anode liquid circulation tank, and a second liquid level meter is provided in the cathode liquid circulation tank, and both the first liquid level meter and the second liquid level meter are electrically connected to the controller.

[0011] Optionally, the water electrolysis hydrogen production device suitable for renewable energy volatility also includes a raw water tank and a water replenishment pump, and the raw water tank is connected to the anode liquid circulation tank, the cathode liquid circulation tank or the connecting pipe through the water replenishment pump.

[0012] Optionally, the connecting pipe is connected to the anode chamber inlet of the electrolytic cell and the cathode chamber inlet of the electrolytic cell through an alkali solution circulation pump and an alkali solution cooler in sequence.

[0013] Optionally, the water electrolysis hydrogen production device suitable for renewable energy volatility also includes a first flow valve and a second flow valve. The alkali liquid cooler is connected to the anode chamber inlet of the electrolyzer through the first flow valve, and the alkali liquid cooler is connected to the cathode chamber inlet of the electrolyzer through the second flow valve; the first flow valve, the second flow valve and the controller are electrically connected.

[0014] Optionally, the water replenishment pump, the alkali solution circulation pump and the alkali solution cooler are all electrically connected to the controller.

[0015] Optionally, the water electrolysis hydrogen production device suitable for renewable energy volatility also includes a first temperature variable washing device and a second temperature variable washing device, the gas phase outlet of the anode gas-liquid separator is connected to the first gas phase main pipe through the first temperature variable washing device, the gas phase outlet of the anode liquid circulation tank is connected to the first gas phase main pipe through the first temperature variable washing device, the gas phase outlet of the cathode gas-liquid separator is connected to the second gas phase main pipe through the second temperature variable washing device, and the gas phase outlet of the cathode liquid circulation tank is connected to the second gas phase main pipe through the second temperature variable washing device.

[0016] Optionally, the water electrolysis hydrogen production device suitable for renewable energy volatility also includes an oxygen hydrogen content analyzer for detecting the hydrogen content in oxygen, the oxygen hydrogen content analyzer is arranged on the first gas phase main pipe, and the oxygen hydrogen content analyzer is electrically connected to the controller.

[0017] Optionally, the water electrolysis hydrogen production device suitable for renewable energy volatility also includes a hydrogen oxygen analyzer for detecting the oxygen content in hydrogen, the hydrogen oxygen analyzer is arranged on the second gas phase main pipe (22), and the hydrogen oxygen analyzer is electrically connected to the controller.

[0018] The beneficial effects of the present invention are:

[0019] The water electrolysis hydrogen production device suitable for renewable energy volatility provided by the present invention provides a first regulating valve and a second regulating valve on a first gas phase main pipe, and a third regulating valve and a fourth regulating valve on a second gas phase main pipe, and connects the first regulating valve, the second regulating valve, the third regulating valve and the fourth regulating valve to a controller, thereby providing a structural basis for the controller to adjust the oxygen pressure, hydrogen pressure and pressure difference in the water electrolysis hydrogen production device according to the power supply fluctuation of the renewable energy power supply and distribution equipment, so that the water electrolysis hydrogen production device is more adaptable to the volatility of renewable energy power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a water electrolysis hydrogen production device according to a specific embodiment of the present invention.

[0021] Description of Reference Numerals

[0022] 1: Electrolyzer;

[0023] 21: first gas phase main pipe; 22: second gas phase main pipe; 23: first regulating valve; 24: second regulating valve; 25: third regulating valve; 26: fourth regulating valve;

[0024] 31: anode gas-liquid separator; 32: cathode gas-liquid separator;

[0025] 41: Anode liquid circulation tank; 42: Cathodic liquid circulation tank;

[0026] 5: connecting pipe;

[0027] 61: Raw material water tank; 62: Water supply pump;

[0028] 71: lye circulation pump; 72: lye cooler;

[0029] 81: first temperature-variable washing device; 82: second temperature-variable washing device. DETAILED DESCRIPTION

[0030] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0031] like Figure 1 As shown, the present invention provides a water electrolysis hydrogen production device suitable for renewable energy volatility, the water electrolysis hydrogen production device comprises renewable energy power supply and distribution equipment, an electrolyzer 1, a first gas phase main pipe 21 for collecting the anode gas phase of the electrolyzer 1, a second gas phase main pipe 22 for collecting the cathode gas phase of the electrolyzer 1, and a controller; the electrolyzer 1 and the controller are both electrically connected to the renewable energy power supply and distribution equipment, a first regulating valve 23 and a second regulating valve 24 are arranged in parallel on the first gas phase main pipe 21, a third regulating valve 25 and a fourth regulating valve 26 are arranged in parallel on the second gas phase main pipe 22, the caliber of the first regulating valve 23 is larger than the caliber of the second regulating valve 24, the caliber of the third regulating valve 25 is larger than the caliber of the fourth regulating valve 26, and the first regulating valve 23, the second regulating valve 24, the third regulating valve 25 and the fourth regulating valve 26 are all electrically connected to the controller.

[0032] The water electrolysis hydrogen production device configured in this way, by arranging the first regulating valve 23 and the second regulating valve 24 on the first gas phase main pipe 21, arranging the third regulating valve 25 and the fourth regulating valve 26 on the second gas phase main pipe 22, and connecting the first regulating valve 23, the second regulating valve 24, the third regulating valve 25 and the fourth regulating valve 26 to the controller, provides a structural basis for the controller to adjust the oxygen pressure, hydrogen pressure and pressure difference in the water electrolysis hydrogen production device according to the power supply fluctuation of the renewable energy power supply and distribution equipment, so that the water electrolysis hydrogen production device can better adapt to the volatility of renewable energy power generation. Specifically, as an example, based on this structure, when the current of the renewable energy power supply and distribution equipment rises rapidly (that is, the current change rate is greater than 10KA / S), the second regulating valve 24 and the fourth regulating valve 26 are fully opened to adjust the opening of the first regulating valve 23 and the third regulating valve 25, so as to maintain the preset pressure and pressure difference to adapt to the volatility of renewable energy power generation; when the current of the renewable energy power supply and distribution equipment drops rapidly (that is, the current change rate is greater than 10KA / S), the first regulating valve 23 and the third regulating valve 25 are closed to adjust the opening of the second regulating valve 24 and the fourth regulating valve 26, so as to quickly reduce the pressure to adapt to the volatility of renewable energy power generation.

[0033] Preferably, the caliber of the second regulating valve 24 is 20% to 80% of the caliber of the first regulating valve 23, and the caliber of the fourth regulating valve 26 is 20% to 80% of the caliber of the third regulating valve 25. Providing the first regulating valve 23, the second regulating valve 24, the third regulating valve 25, and the fourth regulating valve 26 with such a caliber ratio can improve the regulation accuracy.

[0034] Preferably, the electrolytic water hydrogen production device suitable for renewable energy volatility also includes an anode gas-liquid separator 31, a cathode gas-liquid separator 32, an anode liquid circulation tank 41 and a cathode liquid circulation tank 42; the anode chamber outlet of the electrolyzer 1 is connected to the inlet of the anode gas-liquid separator 31, the gas phase outlet of the anode gas-liquid separator 31 is connected to the first gas phase main pipe 21, the liquid phase outlet of the anode gas-liquid separator 31 is connected to the liquid phase inlet of the anode liquid circulation tank 41, the gas phase outlet of the anode liquid circulation tank 41 is connected to the first gas phase main pipe 21, and the cathode chamber of the electrolyzer 1 The outlet is connected to the inlet of the cathode gas-liquid separator 32, the gas phase outlet of the cathode gas-liquid separator 32 is connected to the second gas phase main pipe 22, the liquid phase outlet of the cathode gas-liquid separator 32 is connected to the liquid phase inlet of the cathode liquid circulation tank 42, the gas phase outlet of the cathode liquid circulation tank 42 is connected to the second gas phase main pipe 22, the liquid phase outlet at the bottom of the anode liquid circulation tank 41 is connected to the liquid phase outlet at the bottom of the cathode liquid circulation tank 42 through at least one connecting pipe 5, and the anode chamber inlet of the electrolytic cell 1 and the cathode chamber inlet of the electrolytic cell 1 are respectively connected to the connecting pipe 5. In this way, the anode liquid can be separated into gas and liquid in the anode gas-liquid separator 31 and the anode liquid circulation tank 41, and the cathode liquid can be separated into gas and liquid in the cathode gas-liquid separator 32 and the cathode liquid circulation tank 42. The liquid phase outlet at the bottom of the anode liquid circulation tank 41 and the liquid phase outlet at the bottom of the cathode liquid circulation tank 42 are connected through the connecting pipe 5, which can ensure that the concentrations of the anode liquid and the cathode liquid returned to the electrolytic cell 1 remain consistent.

[0035] Preferably, the water electrolysis hydrogen production device also includes a first flow valve and a second flow valve. The alkali liquid cooler 72 is connected to the anode chamber inlet of the electrolytic cell 1 through the first flow valve, and the alkali liquid cooler 72 is connected to the cathode chamber inlet of the electrolytic cell 1 through the second flow valve; the first flow valve and the second flow valve are both electrically connected to the controller.

[0036] Preferably, a first liquid level gauge is provided in the anode liquid circulation tank 41, and a second liquid level gauge is provided in the cathode liquid circulation tank 42, and both the first liquid level gauge and the second liquid level gauge are electrically connected to the controller. In this way, a structural basis is provided for stopping the renewable energy power supply and distribution equipment when the liquid level difference between the anode liquid circulation tank 41 and the cathode liquid circulation tank 42 reaches a set limit value, and the safety risk of rapid increase in gas phase pressure caused by mutual channeling of anode and cathode gases or liquid phase blocking gas phase can be prevented, and the controller can trigger the interlock to automatically stop the renewable energy power supply and distribution equipment.

[0037] Preferably, the electrolytic water hydrogen production device suitable for renewable energy volatility also includes a raw water tank 61 and a water replenishment pump 62, and the raw water tank 61 is connected to the anolyte circulation tank 41, the cathode liquid circulation tank 42 or the connecting pipe 5 through the water replenishment pump 62. In this way, the purpose of adjusting the concentration of the electrolyte entering the tank can be achieved by supplying water to the anolyte circulation tank 41, the cathode liquid circulation tank 42 or the connecting pipe 5 through the water replenishment pump 62.

[0038] Preferably, the connecting pipe 5 is connected to the anode chamber inlet of the electrolytic cell 1 and the cathode chamber inlet of the electrolytic cell 1 through the alkali liquid circulation pump 71 and the alkali liquid cooler 72 in sequence. When the current load of the electrolytic cell 1 is high, the heat dissipation of hydrogen produced by electrolysis of water is large, so the alkali liquid cooler 72 is set after the alkali liquid circulation pump 71 to cool the electrolyte (i.e., alkali liquid) before it enters the electrolytic cell 1 again.

[0039] Preferably, the water replenishment pump 62, the alkali solution circulation pump 71 and the alkali solution cooler 72 are all electrically connected to the controller. Since the liquid flow rate into the electrolytic cell 1 is adjusted with the current of the electrolytic cell 1, the amount of liquid entering the electrolytic cell 1 will cause the fluctuation of the amount of liquid at the outlet of the electrolytic cell 1, thereby affecting the fluctuation of the liquid level of the self-flowing into the circulation tank at the outlet of the electrolytic cell 1. Therefore, the water replenishment pump 62 and the alkali solution circulation pump 71 are all electrically connected to the controller to provide a structural basis for adjusting the liquid flow rate into the electrolytic cell 1 and the amount of water entering the circulation tank according to the change of the current of the electrolytic cell 1.

[0040] Preferably, the electrolytic water hydrogen production device suitable for renewable energy volatility also includes a first temperature variable washing device 81 and a second temperature variable washing device 82, the gas phase outlet of the anode gas-liquid separator 31 is connected to the first gas phase main pipe 21 through the first temperature variable washing device 81, the gas phase outlet of the anode liquid circulation tank 41 is connected to the first gas phase main pipe 21 through the first temperature variable washing device 81, the gas phase outlet of the cathode gas-liquid separator 32 is connected to the second gas phase main pipe 22 through the second temperature variable washing device 82, and the gas phase outlet of the cathode liquid circulation tank 42 is connected to the second gas phase main pipe 22 through the second temperature variable washing device 82. In this way, water in oxygen can be removed by the first temperature variable washing device 81, and water in hydrogen can be removed by the second temperature variable washing device 82.

[0041] Preferably, the electrolytic water hydrogen production device suitable for renewable energy volatility also includes an oxygen-hydrogen analyzer for detecting the hydrogen content in oxygen and an oxygen-hydrogen analyzer for detecting the oxygen content in hydrogen. The oxygen-hydrogen analyzer is arranged on the first gas phase main pipe 21, and the hydrogen-oxygen analyzer is arranged on the second gas phase main pipe 22. The oxygen-hydrogen analyzer and the hydrogen-oxygen analyzer are both electrically connected to the controller. In this way, a structural basis is provided for stopping the renewable energy power supply and distribution equipment when the hydrogen content in oxygen or the oxygen content in hydrogen reaches the set limit value, which can prevent the safety risks caused by impure oxygen in the first gas phase main pipe 21 and impure hydrogen in the second gas phase main pipe 22, and the controller can trigger the interlock to automatically stop the renewable energy power supply and distribution equipment.

[0042] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0045] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0046] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A water electrolysis hydrogen production device suitable for the volatility of renewable energy, characterized in that: The invention comprises renewable energy power supply and distribution equipment, an electrolytic cell (1), a first gas phase main pipe (21) for collecting anode gas phase of the electrolytic cell (1), a second gas phase main pipe (22) for collecting cathode gas phase of the electrolytic cell (1), and a controller; The electrolytic cell (1) and the controller are both electrically connected to renewable energy power supply and distribution equipment; a first regulating valve (23) and a second regulating valve (24) are arranged in parallel on the first gas phase main pipe (21); a third regulating valve (25) and a fourth regulating valve (26) are arranged in parallel on the second gas phase main pipe (22); the caliber of the first regulating valve (23) is larger than the caliber of the second regulating valve (24); the caliber of the third regulating valve (25) is larger than the caliber of the fourth regulating valve (26); and the first regulating valve (23), the second regulating valve (24), the third regulating valve (25) and the fourth regulating valve (26) are all electrically connected to the controller.

2. The water electrolysis hydrogen production device applicable to renewable energy fluctuation according to claim 1 is characterized in that: The diameter of the second regulating valve (24) is 20% to 80% of the diameter of the first regulating valve (23), and the diameter of the fourth regulating valve (26) is 20% to 80% of the diameter of the third regulating valve (25).

3. The water electrolysis hydrogen production device applicable to renewable energy fluctuation according to claim 1 is characterized in that: It also includes an anode gas-liquid separator (31), a cathode gas-liquid separator (32), an anode liquid circulation tank (41) and a cathode liquid circulation tank (42); The anode chamber outlet of the electrolytic cell (1) is connected to the inlet of the anode gas-liquid separator (31), the gas phase outlet of the anode gas-liquid separator (31) is connected to the first gas phase main pipe (21), the liquid phase outlet of the anode gas-liquid separator (31) is connected to the liquid phase inlet of the anode liquid circulation tank (41), the gas phase outlet of the anode liquid circulation tank (41) is connected to the first gas phase main pipe (21), the cathode chamber outlet of the electrolytic cell (1) is connected to the inlet of the cathode gas-liquid separator (32), and the gas phase outlet of the cathode gas-liquid separator (32) is connected to the first gas phase main pipe (21). The cathode liquid circulation tank (42) is connected to the cathode gas-liquid separator (32) and the liquid phase outlet is connected to the cathode liquid circulation tank (42). The cathode liquid circulation tank (42) is connected to the second gas phase main pipe (22). The liquid phase outlet at the bottom of the anode liquid circulation tank (41) is connected to the liquid phase outlet at the bottom of the cathode liquid circulation tank (42) through at least one connecting pipe (5). The anode chamber inlet of the electrolytic cell (1) and the cathode chamber inlet of the electrolytic cell (1) are respectively connected to the connecting pipe (5).

4. The water electrolysis hydrogen production device applicable to renewable energy fluctuation according to claim 3 is characterized in that: A first liquid level meter is arranged in the anode liquid circulation tank (41), and a second liquid level meter is arranged in the cathode liquid circulation tank (42). Both the first liquid level meter and the second liquid level meter are electrically connected to the controller.

5. The water electrolysis hydrogen production device applicable to renewable energy fluctuation according to claim 3 is characterized in that: It also includes a raw water tank (61) and a water replenishment pump (62), and the raw water tank (61) is connected to the anode liquid circulation tank (41), the cathode liquid circulation tank (42) or the connecting pipe (5) through the water replenishment pump (62).

6. The water electrolysis hydrogen production device applicable to renewable energy fluctuations according to claim 5 is characterized in that: The connecting pipe (5) is connected to the anode chamber inlet of the electrolytic cell (1) and the cathode chamber inlet of the electrolytic cell (1) through the alkali solution circulation pump (71) and the alkali solution cooler (72) in sequence.

7. The water electrolysis hydrogen production device applicable to renewable energy fluctuations according to claim 6 is characterized in that: It also includes a first flow valve and a second flow valve. The alkali liquid cooler (72) is connected to the anode chamber inlet of the electrolytic cell (1) through the first flow valve, and the alkali liquid cooler (72) is connected to the cathode chamber inlet of the electrolytic cell (1) through the second flow valve. The first flow valve and the second flow valve are both electrically connected to the controller.

8. The water electrolysis hydrogen production device applicable to renewable energy fluctuation according to claim 6 or 7, characterized in that: The water replenishment pump (62), the alkali solution circulation pump (71) and the alkali solution cooler (72) are all electrically connected to the controller.

9. The water electrolysis hydrogen production device applicable to renewable energy fluctuations according to claim 3 is characterized in that: It also includes a first temperature-variable washing device (81) and a second temperature-variable washing device (82); the gas phase outlet of the anode gas-liquid separator (31) is connected to the first gas phase main pipe (21) through the first temperature-variable washing device (81); the gas phase outlet of the anode liquid circulation tank (41) is connected to the first gas phase main pipe (21) through the first temperature-variable washing device (81); the gas phase outlet of the cathode gas-liquid separator (32) is connected to the second gas phase main pipe (22) through the second temperature-variable washing device (82); and the gas phase outlet of the cathode liquid circulation tank (42) is connected to the second gas phase main pipe (22) through the second temperature-variable washing device (82).

10. The water electrolysis hydrogen production device applicable to renewable energy fluctuation according to claim 1, 3 or 9, characterized in that: It also includes an oxygen-hydrogen analyzer for detecting the hydrogen content in oxygen. The oxygen-hydrogen analyzer is arranged on the first gas phase main pipe (21), and the oxygen-hydrogen analyzer is electrically connected to the controller.

11. The water electrolysis hydrogen production device applicable to renewable energy fluctuation according to claim 1, 3 or 9, characterized in that: It also includes an oxygen-in-hydrogen analyzer for detecting the oxygen content in hydrogen. The oxygen-in-hydrogen analyzer is arranged on the second gas phase main pipe (22) and is electrically connected to the controller.

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