Alkaline water electrolysis hydrogen production system
By introducing monitoring and control devices into the alkaline water electrolysis hydrogen production system, the flow rates of pure water and alkaline solution are dynamically adjusted, solving the problem of water waste caused by changes in gas production and achieving the effects of efficient water conservation and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-03-13
AI Technical Summary
Traditional alkaline water electrolysis hydrogen production systems experience changes in the amount of alkali carried in the gas discharged from the separator when hydrogen production demand changes. This affects the amount of washing liquid used, resulting in high water consumption and high costs.
By introducing monitoring and control devices into the system, the pure water flow and alkali circulation are dynamically adjusted, and the washing water consumption and alkali replenishment are adjusted in real time according to the changes in gas production, thereby reducing water consumption.
It achieves efficient alkaline scrubbing when gas production changes, reduces water consumption, lowers system costs, and maintains system stability.
Smart Images
Figure CN121653689A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of new energy technology, and more specifically to an alkaline water electrolysis hydrogen production system. Background Technology
[0002] In alkaline water electrolysis hydrogen production systems, as the electrolyzer continuously produces hydrogen, especially when the demand for hydrogen production changes, the gas production rate of the electrolyzer also changes. This leads to variations in the amount of alkali carried in the gas discharged from the separator, affecting the amount of washing liquid used. Traditional alkaline water electrolysis hydrogen production systems typically input pure water into the scrubber at a large or maximum flow rate, thus accommodating both large and small gas volume washing operations. However, this type of system consumes a significant amount of water and is very costly.
[0003] Therefore, an alkaline water electrolysis hydrogen production system is needed to at least partially solve the above problems. Summary of the Invention
[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.
[0005] To at least partially solve the above problems, this application provides an alkaline water electrolysis hydrogen production system, the alkaline water electrolysis hydrogen production system comprising: An electrolyzer, the electrolyzer including a hydrogen-side outlet; A hydrogen-side liquid separator, comprising a hydrogen-side mixed liquid inlet, a hydrogen-side separated gas outlet, and a hydrogen-side reflux liquid inlet, wherein the hydrogen-side outlet is connected to the hydrogen-side mixed liquid inlet; A hydrogen-side scrubber, comprising a hydrogen-side scrubbing inlet, a first reflux port, and a first pure water inlet, wherein the hydrogen-side scrubbing inlet is connected to the hydrogen-side separated gas outlet via a first pipeline, and the first reflux port is connected to the hydrogen-side reflux liquid inlet; A pure water pipeline is provided with a pure water regulating valve. The pure water pipeline is connected to the first pure water inlet and is used to supply pure water to the hydrogen-side scrubber. A first monitoring device is installed in the first pipeline and is used to monitor the mass concentration of alkali in the fluid of the first pipeline. A control device is connected to the first monitoring device and the pure water regulating valve via signal connection. The control device is configured to increase the opening degree of the pure water regulating valve when the value of the first monitoring device is greater than or equal to the first mass concentration.
[0006] According to the alkaline water electrolysis hydrogen production system of this application, the amount of alkali carried by the gas discharged from the separator is monitored by a first monitoring device. When the gas production increases, the flow rate of pure water for washing can be dynamically increased, so that the alkali can be washed thoroughly and the alkali carried by hydrogen into the next step can be avoided as much as possible.
[0007] Optionally, the control device is further configured to reduce the opening of the pure water regulating valve when the value of the first monitoring device is less than or equal to the second mass concentration. According to the above settings, the amount of pure water used for washing can be dynamically reduced when the gas production decreases, saving water and reducing costs.
[0008] Optionally, the control device is further configured to maintain the opening of the pure water regulating valve unchanged when the value of the first monitoring device is less than the first mass concentration and greater than the second mass concentration. According to this scheme, when the gas production is moderate, the washing water consumption is maintained, thereby using pure water for washing to supplement the system's water consumption.
[0009] Optionally, the hydrogen-side separator further includes a hydrogen-side separated liquid outlet, the electrolyzer further includes a hydrogen-side inlet, and the alkaline water electrolysis hydrogen production system further includes: A circulating pump, wherein the inlet of the circulating pump is connected to the outlet of the hydrogen-side separated liquid, and the outlet of the circulating pump is connected to the inlet of the hydrogen side; An alkali preparation tank has an alkali inlet, which is connected to the pipeline between the inlet of the circulation pump and the hydrogen side inlet via a second pipeline; A first switching valve is disposed in the second pipeline; The control device is also connected to the first switching valve signal and is further configured to open the first switching valve when the value of the first monitoring device is greater than or equal to the first mass concentration. According to this solution, when the flow rate of pure water for washing increases, the circulating alkali solution returning from the separator increases. The excess alkali solution is temporarily accommodated in the alkali mixing tank to maintain system stability.
[0010] Optionally, the control device is further configured to: control the first switching valve to close when the value of the first monitoring device is less than the first mass concentration. According to this solution, when the flow rate of pure water for washing decreases, the amount of circulating alkali solution in the system stabilizes, and there is no longer a need for a temporary alkali preparation tank.
[0011] Optionally, the diameter of the second pipeline is smaller than the diameter of the pipeline between the inlet of the circulating pump and the hydrogen-side inlet. According to this design, the pipe diameter ensures that the circulating alkali solution maintains normal circulation, while excess alkali solution can enter the alkali preparation tank.
[0012] Optionally, the electrolyzer further includes an oxygen-side outlet and an oxygen-side inlet, and the outlet of the circulating pump is also connected to the oxygen-side inlet. The alkaline water electrolysis hydrogen production system further includes: An oxygen-side separator includes an oxygen-side mixed liquid inlet, an oxygen-side separated gas outlet, an oxygen-side reflux liquid inlet, and an oxygen-side separated liquid outlet. The oxygen-side mixed liquid inlet is connected to the oxygen-side outlet, and the oxygen-side separated liquid outlet is connected to the inlet of the circulation pump. An oxygen-side scrubber includes an oxygen-side scrubbing inlet, a second reflux inlet, and a second pure water inlet. The oxygen-side scrubbing inlet is connected to the oxygen-side separated gas outlet. The second reflux inlet is connected to the oxygen-side reflux liquid inlet. The second pure water inlet is connected to the pure water pipeline to receive pure water from the pipeline. According to this design, adjusting the pure water flow rate for scrubbing in both the oxygen-side separator and the oxygen-side scrubber minimizes the risk of alkali being carried into the next stage from the oxygen and conserves water.
[0013] Optionally, the alkali preparation tank also has an alkali outlet, and the alkaline water electrolysis hydrogen production system further includes: A second monitoring device is installed in the oxygen-side separator and is used to monitor the mass fraction of alkali in the alkaline solution in the oxygen-side separator. An alkali mixing pump, wherein the inlet of the alkali mixing pump is connected to the outlet of the alkali solution; The second switching valve is connected between the outlet of the alkali mixing pump and the pipeline between the inlet of the circulation pump and the hydrogen side inlet. The control device is also connected to the second monitoring device, the second switching valve, and the alkali mixing pump. The control device is configured to open the second switching valve and the alkali mixing pump when the value of the second monitoring device is less than a first mass fraction. According to the above settings, when alkali is lost during system operation, the alkali solution stored in the alkali mixing tank is injected into the system using the alkali mixing pump, causing the alkali concentration to recover.
[0014] Optionally, the control device is further configured to: control the second switching valve and the alkali mixing pump to close when the value of the second monitoring device is greater than or equal to the second mass fraction. According to the above settings, once the amount of alkali in the alkali solution reaches the standard, the alkali content in the alkali solution can be kept stable.
[0015] Optionally, the first mass concentration is 200 mg / m³. 3 The second mass concentration is 50 mg / m³. 3 .
[0016] Optionally, the first quality fraction is 29.8% and the second quality fraction is 30%. Attached Figure Description
[0017] The following figures are included as part of this application for understanding the application. The figures illustrate embodiments of the application and their descriptions, serving to explain the principles of the application. In the figures: Figure 1 This is a schematic diagram of an alkaline water electrolysis hydrogen production system according to one embodiment of this application; Figure 2 This is a schematic diagram of the pure water flow control process of an alkaline water electrolysis hydrogen production system according to one embodiment of this application; and Figure 3 This is a schematic diagram of the alkali replenishment control process of an alkaline water electrolysis hydrogen production system according to one embodiment of this application.
[0018] Explanation of reference numerals in the attached figures: 100: Alkaline water electrolysis hydrogen production system; 101: Pure water pipeline; 102: First pipeline; 103: Second pipeline; 104: Circulating pump; 105: Cooling water piping; 106: Alkali solution cooler; 110: Electrolytic cell; 111: Oxygen side inlet; 112: Oxygen side outlet; 113: Hydrogen-side inlet; 114: Hydrogen-side outlet; 120: Hydrogen-side separator; 121: Hydrogen-side mixed liquid inlet; 122: Hydrogen-side separated gas outlet; 123: Hydrogen-side reflux liquid inlet; 124: Hydrogen-side separated liquid outlet; 130: Hydrogen-side scrubber; 131: Hydrogen-side washing inlet; 132: First reflux port; 133: First pure water inlet; 134: First washing outlet; 140: Oxygen-side separator; 141: Oxygen-side mixed liquid inlet; 142: Oxygen-side separated gas outlet; 143: Oxygen-side reflux liquid inlet; 144: Oxygen-side separated liquid outlet; 150: Oxygen-side scrubber; 151: Oxygen-side washing inlet; 152: Second reflux inlet; 153: Second pure water inlet; 154: Second washing outlet; 160: Control device; 161: First monitoring device; 162: Second monitoring device; 163: Pure water regulating valve; 164: First switching valve; 165: Second switching valve; 166: Cooling water regulating valve; 170: Hydrogen-side gas-water separator; 171: Hydrogen-side water collector; 172: Hydrogen cooler; 180: Oxygen-side gas-water separator; 181: Oxygen-side water collector; 182: Oxygen cooler; 190: Alkali preparation tank; 191: Alkali solution inlet; 192: Alkali solution outlet; 193: Alkali mixing pump. Detailed Implementation
[0019] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described to avoid confusion with this application.
[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.
[0021] The ordinal numbers such as “first” and “second” used in this application are merely identifiers and have no other meaning, such as a specific order. Furthermore, for example, the term “first component” does not imply the existence of a “second component,” and the term “second component” does not imply the existence of a “first component.” It should be noted that the terms “upper,” “lower,” “front,” “back,” “left,” “right,” “inner,” “outer,” and similar expressions used herein are for illustrative purposes only and are not intended to be limiting.
[0022] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings.
[0023] refer to Figure 1 This application provides an alkaline water electrolysis hydrogen production system 100, which includes an electrolyzer 110, a hydrogen-side separator 120, a hydrogen-side scrubber 130, an oxygen-side separator 140, an oxygen-side scrubber 150, and a pure water pipeline 101. The electrolyzer 110 has a hydrogen-side inlet 113, a hydrogen-side outlet 114, an oxygen-side inlet 111, and an oxygen-side outlet 112.
[0024] The hydrogen-side separator 120 has a hydrogen-side mixed liquid inlet 121. The hydrogen-side outlet 114 of the electrolyzer 110 is connected to the hydrogen-side mixed liquid inlet 121 of the hydrogen-side separator 120, so that the hydrogen-liquid two-phase flow generated on the hydrogen side of the electrolyzer 110 can enter the hydrogen-side separator 120. The oxygen-side separator 140 has an oxygen-side mixed liquid inlet 141. The oxygen-side outlet 112 of the electrolyzer 110 is connected to the oxygen-side mixed liquid inlet 141 of the oxygen-side separator 140, so that the oxygen-liquid two-phase flow generated on the oxygen side of the electrolyzer 110 can enter the oxygen-side separator 140.
[0025] The hydrogen-side separator 120 also has a hydrogen-side separated gas outlet 122 and a hydrogen-side separated liquid outlet 124. The hydrogen gas separated in the hydrogen-side separator 120 leaves the hydrogen-side separator 120 from the hydrogen-side separated gas outlet 122, and the separated liquid leaves the hydrogen-side separator 120 from the hydrogen-side separated liquid outlet 124 and enters the hydrogen-side scrubber 130 for washing.
[0026] The oxygen-side separator 140 also has an oxygen-side separated gas outlet 142 and an oxygen-side separated liquid outlet 144. The oxygen separated in the oxygen-side separator 140 leaves the oxygen-side separator 140 from the oxygen-side separated gas outlet 142 and enters the oxygen-side scrubber 150 for washing. The separated liquid leaves the hydrogen-side separator 120 from the oxygen-side separated liquid outlet 144.
[0027] The alkaline water electrolysis hydrogen production system 100 also includes a circulation pump 104, wherein the hydrogen-side separated liquid outlet 124 and the oxygen-side separated liquid outlet 144 are both connected to the inlet of the circulation pump 104, and the outlet of the circulation pump 104 is connected to the hydrogen-side inlet 113 and the oxygen-side inlet 111 of the electrolyzer 110. Thus, the circulation pump 104 pumps the separated liquid leaving the hydrogen-side separator 120 and the oxygen-side separator 140 back to the electrolyzer 110 to participate in the reaction again, forming an alkaline liquid circulation. Preferably, an alkaline liquid cooler 106 can be installed upstream of the circulation pump 104.
[0028] The alkaline water electrolysis hydrogen production system 100 also includes an alkali preparation tank 190 and an alkali preparation pump 193. The alkali preparation tank 190 has an alkali outlet 192, and the inlet of the alkali preparation pump 193 is connected to the alkali outlet 192. The outlet of the alkali preparation pump 193 is connected to the pipeline between the inlet of the circulation pump 104 and the hydrogen-side inlet 113, so that the alkali preparation pump 193 can pump the alkali stored in the alkali preparation tank 190 into the circulation system to replenish the alkali consumed in the system.
[0029] The hydrogen-side scrubber 130 has a hydrogen-side scrubbing inlet 131, a first reflux port 132, a first pure water inlet 133, and a first scrubbing outlet 134. The hydrogen-side scrubbing inlet 131 is connected to the hydrogen-side separated gas outlet 122 of the hydrogen-side separator 120 to receive hydrogen gas from the hydrogen-side separator 120. In this embodiment, the hydrogen-side scrubbing inlet 131 and the hydrogen-side separated gas outlet 122 are connected via a first pipeline 102. The first pure water inlet 133 is connected to a pure water pipeline 101, allowing the pure water pipeline 101 to supply pure water to the hydrogen-side scrubber 130 for scrubbing the hydrogen gas. The hydrogen-side separator 120 also has a hydrogen-side reflux liquid inlet 123, and the first reflux port 132 of the hydrogen-side scrubber 130 is connected to the hydrogen-side reflux liquid inlet 123, thereby returning the scrubbing liquid to the hydrogen-side separator 120. The washed hydrogen gas leaves the hydrogen-side scrubber 130 through the first scrubbing outlet 134.
[0030] The oxygen-side scrubber 150 has an oxygen-side scrubbing inlet 151, a second reflux inlet 152, a second pure water inlet 153, and a second scrubbing outlet 154. The oxygen-side scrubbing inlet 151 is connected to the oxygen-side separated gas outlet 142 of the oxygen-side separator 140 to receive oxygen from the separator. The second pure water inlet 153 is connected to a pure water pipeline 101, allowing the pure water pipeline 101 to supply pure water to the oxygen-side scrubber 150 for scrubbing the oxygen. The oxygen-side separator 140 also has an oxygen-side reflux liquid inlet 143, and the second reflux inlet 152 of the oxygen-side scrubber 150 is connected to the reflux liquid inlet 143, thereby returning the scrubbing liquid to the separator. The scrubbed oxygen leaves the oxygen-side scrubber 150 through the second scrubbing outlet 154.
[0031] The alkaline water electrolysis hydrogen production system 100 also includes a hydrogen-side gas-water separator 170, a hydrogen-side water collector 171, an oxygen-side gas-water separator 180, and an oxygen-side water collector 181. The first washing outlet 134 of the hydrogen-side scrubber 130 is connected to the hydrogen-side gas-water separator 170. The washed hydrogen enters the hydrogen-side gas-water separator 170 for gas-water separation. The separated pure hydrogen leaves the hydrogen-side gas-water separator 170 and enters the next stage of the hydrogen-side purification system. The separated water enters the hydrogen-side water collector 171 for collection, and then enters the next stage of the hydrogen-side water seal tank for further processing or storage. In a preferred embodiment, a hydrogen cooler 172 is provided between the hydrogen-side gas-water separator 170 and the hydrogen-side scrubber 130.
[0032] The second washing outlet 154 of the oxygen-side scrubber 150 is connected to the oxygen-side gas-liquid separator 180. The scrubbed oxygen enters the oxygen-side gas-liquid separator 180 for gas-liquid separation. The separated pure oxygen leaves the oxygen-side gas-liquid separator 180 and enters the next stage of the oxygen-side purification system. The separated water enters the oxygen-side water collector 181 for collection, and then enters the next stage of the oxygen-side water seal tank for further processing or storage. In a preferred embodiment, an oxygen cooler 182 is provided between the oxygen-side gas-liquid separator 180 and the oxygen-side scrubber 150.
[0033] The alkaline water electrolysis hydrogen production system 100 also includes a cooling water pipeline 105, which is connected to an oxygen cooler 182, a hydrogen cooler 172, and an alkaline cooler 106 to provide cooling water circulation to these three components. Preferably, a cooling water regulating valve 166 is provided on the cooling water pipeline 105 to control the cooling water flow rate according to the gas production rate, thereby adapting to heat exchange under different gas volumes and saving resources.
[0034] Continue to refer to Figure 1 and Figure 2 The alkaline water electrolysis hydrogen production system 100 also includes a first monitoring device 161 and a control device 160. The first monitoring device 161 is installed in the first pipeline 102 and is used to monitor the mass concentration of alkali in the fluid of the first pipeline 102. A pure water regulating valve 163 is installed on the pure water pipeline 101.
[0035] The control device 160 is connected to the first monitoring device 161 and the pure water regulating valve 163 by signal. The control device 160 is configured to increase the opening degree of the pure water regulating valve 163 when the value of the first monitoring device 161 is greater than or equal to the first mass concentration.
[0036] According to the alkaline water electrolysis hydrogen production system 100 of this application, the amount of alkali carried by the gas discharged from the separator is monitored by the first monitoring device 161. When the gas production increases, the flow rate of pure water for washing can be dynamically increased so that the alkali can be washed thoroughly and the alkali carried by hydrogen into the next step can be avoided as much as possible.
[0037] Furthermore, the control device 160 is configured to reduce the opening of the pure water regulating valve 163 when the value of the first monitoring device 161 is less than or equal to the second mass concentration. When the value of the first monitoring device 161 is less than the first mass concentration but greater than the second mass concentration, the opening of the pure water regulating valve 163 is kept constant. According to the above settings, the amount of pure water used for washing can be dynamically reduced when the gas production decreases, saving water and reducing costs. When the gas production is moderate, the amount of pure water used for washing is maintained, thereby using the pure water used for washing to supplement the system's water consumption.
[0038] The alkaline water electrolysis hydrogen production system 100 also includes a first switching valve 164 and a second pipeline 103. The alkali preparation tank 190 further has an alkali inlet 191, wherein one end of the second pipeline 103 is connected to the alkali inlet 191, and the other end is connected to the pipeline between the inlet of the circulation pump 104 and the hydrogen-side inlet 113. In a preferred embodiment, the diameter of the second pipeline 103 is smaller than the diameter of the pipeline between the inlet of the circulation pump 104 and the hydrogen-side inlet 113. More preferably, the diameter of the second pipeline 103 is less than or equal to half the diameter of the pipeline between the inlet of the circulation pump 104 and the hydrogen-side inlet 113. This pipe diameter design ensures that the circulating alkali solution not only maintains normal circulation, but also allows excess alkali solution to enter the alkali preparation tank 190.
[0039] The first switching valve 164 is installed on the second pipeline 103, and the control device 160 is also signal-connected to the first switching valve 164. The control device 160 is further configured to open the first switching valve 164 when the value of the first monitoring device 161 is greater than or equal to the first mass concentration, and to close the first switching valve 164 when the value of the first monitoring device 161 is less than the first mass concentration. According to the above configuration, when the flow rate of the pure water used for washing increases, the circulating alkali solution returning from the separator increases. The alkali preparation tank 190 temporarily accommodates the excess alkali solution, maintaining system stability. When the flow rate of the pure water used for washing decreases, the amount of circulating alkali solution in the system tends to stabilize, and the alkali preparation tank 190 is no longer needed for temporary storage.
[0040] As an optional implementation, the first mass concentration is 200 mg / m³. 3 The second mass concentration is 50 mg / m³. 3 .
[0041] The alkaline water electrolysis hydrogen production system 100 also includes a second monitoring device 162 and a second switching valve 165. The second monitoring device 162 is located in the oxygen-side separator 140 and is used to monitor the mass fraction of alkali in the alkaline solution in the oxygen-side separator 140. The second switching valve 165 is connected between the outlet of the alkali mixing pump 193 and the inlet of the circulation pump 104 and the hydrogen-side inlet 113.
[0042] The control device 160 is also connected to the second monitoring device 162, the second switching valve 165, and the alkali mixing pump 193 via signal connections. (Reference) Figure 3As the system operates, alkali in the circulating alkali solution will be lost, leading to a decrease in the concentration of the circulating alkali solution. The control device 160 is configured to open the second switching valve 165 and the alkali mixing pump 193 when the value of the second monitoring device 162 is less than the first mass fraction. When the value of the second monitoring device 162 is greater than or equal to the second mass fraction, it controls the second switching valve 165 and the alkali mixing pump 193 to close. Therefore, when alkali is lost during system operation, the alkali mixing pump 193 injects the alkali solution stored in the alkali mixing tank 190 into the system, restoring the alkali content in the alkali solution. Once the alkali content in the alkali solution reaches the standard, the mass fraction of the alkali solution can be maintained stably.
[0043] As an alternative implementation, the first mass fraction is 29.8%, and the second mass fraction is 30%.
[0044] The processes and steps described in all the preferred embodiments above are merely examples. Unless adverse effects occur, various processing operations can be performed in a different order than the above-described processes. The order of steps in the above processes can also be added, combined, or deleted according to actual needs.
[0045] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the scope of this application. Features described in one embodiment may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.
[0046] This application has been described through the above embodiments. However, it should be understood that the above embodiments are only for illustrative purposes. This application is not limited to the above embodiments. Many variations and modifications can be made based on the teachings of this application, and all such variations and modifications fall within the scope of protection claimed in this application.
Claims
1. An alkaline water electrolysis hydrogen production system, characterized in that, The alkaline water electrolysis hydrogen production system includes: An electrolyzer, the electrolyzer including a hydrogen-side outlet; A hydrogen-side liquid separator, comprising a hydrogen-side mixed liquid inlet, a hydrogen-side separated gas outlet, and a hydrogen-side reflux liquid inlet, wherein the hydrogen-side outlet is connected to the hydrogen-side mixed liquid inlet; A hydrogen-side scrubber, comprising a hydrogen-side scrubbing inlet, a first reflux port, and a first pure water inlet, wherein the hydrogen-side scrubbing inlet is connected to the hydrogen-side separated gas outlet via a first pipeline, and the first reflux port is connected to the hydrogen-side reflux liquid inlet; A pure water pipeline is provided with a pure water regulating valve. The pure water pipeline is connected to the first pure water inlet and is used to supply pure water to the hydrogen-side scrubber. A first monitoring device is installed in the first pipeline and is capable of monitoring the mass concentration of alkali contained in the fluid in the first pipeline. A control device is connected to the first monitoring device and the pure water regulating valve via signal connection. The control device is configured to increase the opening degree of the pure water regulating valve when the value of the first monitoring device is greater than or equal to the first mass concentration.
2. The alkaline water electrolysis hydrogen production system according to claim 1, characterized in that, The control device is further configured to: reduce the opening of the pure water regulating valve when the value of the first monitoring device is less than or equal to the second mass concentration, wherein the second mass concentration is less than the first mass concentration.
3. The alkaline water electrolysis hydrogen production system according to claim 2, characterized in that, The control device is further configured to maintain the opening of the pure water regulating valve unchanged when the value of the first monitoring device is less than the first mass concentration and greater than the second mass concentration.
4. The alkaline water electrolysis hydrogen production system according to claim 1, characterized in that, The hydrogen-side separator further includes a hydrogen-side separated liquid outlet, the electrolyzer further includes a hydrogen-side inlet, and the alkaline water electrolysis hydrogen production system further includes: A circulating pump, wherein the inlet of the circulating pump is connected to the outlet of the hydrogen-side separated liquid, and the outlet of the circulating pump is connected to the inlet of the hydrogen side; An alkali preparation tank has an alkali inlet, which is connected to the pipeline between the inlet of the circulation pump and the hydrogen side inlet via a second pipeline; A first switching valve is disposed in the second pipeline; The control device is also connected to the first switching valve signal and is further configured to control the first switching valve to open when the value of the first monitoring device is greater than or equal to the first mass concentration.
5. The alkaline water electrolysis hydrogen production system according to claim 4, characterized in that, The control device is further configured to: control the first switching valve to close when the value of the first monitoring device is less than the first mass concentration.
6. The alkaline water electrolysis hydrogen production system according to claim 4, characterized in that, The diameter of the second pipeline is smaller than the diameter of the pipeline between the inlet of the circulating pump and the hydrogen-side inlet.
7. The alkaline water electrolysis hydrogen production system according to claim 4, characterized in that, The electrolyzer further includes an oxygen-side outlet and an oxygen-side inlet, and the outlet of the circulating pump is also connected to the oxygen-side inlet. The alkaline water electrolysis hydrogen production system further includes: An oxygen-side separator includes an oxygen-side mixed liquid inlet, an oxygen-side separated gas outlet, an oxygen-side reflux liquid inlet, and an oxygen-side separated liquid outlet. The oxygen-side mixed liquid inlet is connected to the oxygen-side outlet, and the oxygen-side separated liquid outlet is connected to the inlet of the circulation pump. An oxygen-side scrubber includes an oxygen-side scrubbing inlet, a second reflux inlet, and a second pure water inlet. The oxygen-side scrubbing inlet is connected to the oxygen-side separated gas outlet, the second reflux inlet is connected to the oxygen-side reflux liquid inlet, and the second pure water inlet is connected to the pure water pipeline to receive pure water from the pure water pipeline.
8. The alkaline water electrolysis hydrogen production system according to claim 7, characterized in that, The alkali preparation tank also has an alkali solution outlet, and the alkaline water electrolysis hydrogen production system further includes: A second monitoring device is installed in the oxygen-side separator and is used to monitor the mass fraction of alkali in the alkaline solution in the oxygen-side separator. An alkali mixing pump, wherein the inlet of the alkali mixing pump is connected to the outlet of the alkali solution; The second switching valve is connected between the outlet of the alkali mixing pump and the pipeline between the inlet of the circulation pump and the hydrogen side inlet. The control device is also connected to the second monitoring device, the second switching valve, and the alkali mixing pump. The control device is configured to control the second switching valve and the alkali mixing pump to open when the value of the second monitoring device is less than the first mass fraction.
9. The alkaline water electrolysis hydrogen production system according to claim 8, characterized in that, The control device is further configured to: control the second switching valve and the alkali mixing pump to shut down when the value of the second monitoring device is greater than or equal to the second mass fraction.
10. The alkaline water electrolysis hydrogen production system according to claim 2, characterized in that, The first mass concentration is 200 mg / m³ 3 The second mass concentration is 50 mg / m³. 3 .
11. The alkaline water electrolysis hydrogen production system according to claim 9, characterized in that, The first mass fraction is 29.8%, and the second mass fraction is 30%.