Electrolytic hydrogen production system

Abstract

The invention provides an electrolytic hydrogen production system. The electrolytic hydrogen production system comprises an electrolytic bath, a gas-liquid separation device, a cooling device, a residual gas separation device, a detection component and a control device. An alkali liquor return pipeline is arranged between the gas-liquid separation device and the electrolytic bath; and the cooling device is arranged in the alkali liquor return pipeline. The residual gas separation device is connected to the alkali liquor return pipeline, and the two ends, communicated with the alkali liquor return pipeline, of the residual gas separation device are located on the upstream and the downstream of the cooling device respectively. The detection component is used for detecting the hydrogen content in the oxygen product of the electrolytic hydrogen production system; the control device is electrically connected with the detection component and is at least used for controlling the cooling device and the residual gas separation device not to be simultaneously in an open state according to a detection value of the detection component. According to the electrolytic hydrogen production system, the hydrogen content in the oxygen product of the electrolytic hydrogen production system can be continuously monitored, and the operation parameters are correspondingly adjusted, so that the electrolytic hydrogen production system always operates in a safe range.

Description

Technical Field

[0001] The present application generally relates to the technical field of hydrogen production by electrolysis, and more specifically to a hydrogen production system by electrolysis. Background Art

[0002] As a high energy density fuel, hydrogen emits very few pollutants when used, especially only small amounts of nitrogen oxides, making it a promising alternative energy source for a wide range of industries. Water electrolysis is the most environmentally friendly method, which uses renewable energy such as solar or wind power to generate electricity, separate water into hydrogen and oxygen, and does not produce carbon dioxide emissions. Since hydrogen is explosive and reacts with oxygen, it is necessary to carefully monitor the hydrogen concentration at the oxygen-producing end of the water electrolysis system to prevent the risk of combustion. However, in the prior art, due to the need to maintain a safe hydrogen concentration level, the system often needs to be shut down when the safety level is exceeded, resulting in restrictions on the system during operation.

[0003] Therefore, it is necessary to provide a hydrogen production system by electrolysis to at least partially solve the above problems. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above problems, the present application provides an electrolysis hydrogen production system, the electrolysis hydrogen production system comprising:

[0006] Electrolyzer;

[0007] A gas-liquid separation device, wherein an alkaline solution reflux pipeline is provided between the gas-liquid separation device and the electrolytic cell;

[0008] A cooling device, wherein the cooling device is arranged in the alkali solution reflux pipeline;

[0009] A residual gas separation device, the residual gas separation device is connected to the alkali solution reflux pipeline, and along the reflux direction of the alkali solution in the alkali solution reflux pipeline, two ends of the residual gas separation device connected to the alkali solution reflux pipeline are respectively located upstream and downstream of the cooling device;

[0010] A detection component, the detection component is used to detect the hydrogen content in the oxygen product of the electrolytic hydrogen production system; and

[0011] A control device is electrically connected to the detection component, and the control device is at least used to control the cooling device and the residual gas separation device to be in different open states at the same time according to the detection value of the detection component.

[0012] Optionally, the detection value of the detection component is m;

[0013] When m≥a, the control device controls the entire electrolysis hydrogen production system to stop operating;

[0014] When a>m>b, the control device controls the cooling device to switch to a closed state, and controls the residual gas separation device to switch to an open state;

[0015] When b≥m, the control device controls the cooling device to switch to an on state, and controls the residual gas separation device to switch to a off state.

[0016] Optionally, when a>m>b, the control device controls the cooling device to switch to the closed state, and controls the residual gas separation device to switch to the open state, until c>m, the control device controls the cooling device to switch to the open state, and controls the residual gas separation device to switch to the closed state;

[0017] Among them, b>c.

[0018] Optionally, the gas-liquid separation device comprises an oxygen-side gas-liquid separator, and the oxygen-side gas-liquid separator is connected to the oxygen-side outlet of the electrolytic cell;

[0019] The oxygen-side gas-liquid separator has a gas phase outlet, and the detection component is connected to the gas phase outlet to detect the hydrogen content value in the oxygen product output from the oxygen-side gas-liquid separator.

[0020] Optionally, the electrolysis hydrogen production system further includes an alarm component;

[0021] The alarm component is electrically connected to the detection component and the control device, and the alarm component is used to receive the detection value signal of the detection component and transmit it to the control device;

[0022] The alarm component is also used to issue an alarm when the detection value of the detection component exceeds a preset value.

[0023] Optionally, a liquid inlet and a liquid outlet are respectively provided at two ends of the residual gas separation device;

[0024] The residual gas separation device further comprises a liquid inlet pipeline and a liquid outlet pipeline, the liquid inlet is connected to the alkali solution reflux pipeline via the liquid inlet pipeline, and the liquid outlet is connected to the alkali solution reflux pipeline via the liquid outlet pipeline;

[0025] Among them, along the reflux direction of the alkali solution in the alkali solution reflux pipeline, the connection point between the liquid inlet pipeline and the alkali solution reflux pipeline is located upstream of the cooling device, and the connection point between the liquid outlet pipeline and the alkali solution reflux pipeline is located downstream of the cooling device.

[0026] Optionally, the residual gas separation device comprises a tank body, and the tank body comprises a separation area and a liquid storage area;

[0027] Along the height direction of the tank body, the separation area is located above the liquid storage area, the liquid inlet is located above the separation area, and the liquid outlet is opened in the liquid storage area;

[0028] A filler is arranged in the separation zone, and the filler is used for allowing the alkali solution to pass through so that the gas in the alkali solution is separated from the alkali solution.

[0029] Optionally, the tank body is further provided with an exhaust port, and the exhaust port is located at the top of the tank body; and / or,

[0030] The residual gas separation device further comprises a sprayer, wherein the sprayer is located inside the tank body and is communicated with the liquid inlet.

[0031] Optionally, the electrolysis hydrogen production system further includes a first control valve, and the first control valve is arranged in pairs;

[0032] One of the first control valves is disposed on the liquid inlet pipeline, and the other of the first control valves is disposed on the liquid outlet pipeline;

[0033] The first control valve is electrically connected to the control device, and the control device is used to control the opening and closing of the first control valve to control the opening or closing of the residual gas separation device.

[0034] Optionally, the electrolysis hydrogen production system further includes a second control valve, which is arranged on the alkali solution reflux pipeline;

[0035] The second control valve is located between the two ends of the residual gas separation device connected to the alkali solution reflux pipeline;

[0036] The second control valve is electrically connected to the control device, and the control device is used to control the opening and closing of the second control valve to control the cooling device to be turned on or off.

[0037] According to the electrolytic hydrogen production system of the present application, it is possible to continuously monitor the hydrogen content in the oxygen product of the electrolytic hydrogen production system and adjust the operating parameters accordingly, which greatly reduces the explosion risk associated with hydrogen and allows the electrolytic hydrogen production system to always operate within a safe range. In addition, by controlling the opening and closing of the cooling device, the temperature of the electrolyte can be adjusted and the dissolved gas can be effectively removed, which can not only prevent gas accumulation from causing inefficiency or dangerous situations, but also ensure that the electrolysis process is more efficient and stable. In addition, conventional electrolytic hydrogen production systems may need to shut down when unsafe hydrogen content is detected. However, the electrolytic hydrogen production system provided in the present application can be designed to dynamically adjust conditions (such as heating the electrolyte) so that it can continue to operate uninterruptedly; this improves productivity and reduces operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The following drawings of the embodiments of the present application are hereby used as part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, and are used to explain the principles of the present application. In the drawings,

[0039] Figure 1 A schematic diagram of a hydrogen production system by electrolysis in the prior art;

[0040] Figure 2 A schematic diagram of a hydrogen production system by electrolysis according to a preferred embodiment of the present application; and

[0041] Figure 3 for Figure 2 A magnified detail of part A.

[0042] Description of reference numerals:

[0043] 100 / 200 Electrolysis Hydrogen Production System 110 Electrolyzer

[0044] 120 Gas-liquid separation device 121 Oxygen side gas-liquid separator

[0045] 121a / 122a Gas phase outlet 122 Hydrogen side gas-liquid separator

[0046] 123 First delivery pipeline 124 Second delivery pipeline

[0047] 130 Alkali solution return line 140 Cooling device

[0048] 151 detection member 151a discharge port

[0049] 152 Purification device 153 Water supply tank

[0050] 154 Alkali replenishment tank 155 Pump

[0051] 256 First control valve 257 Second control valve

[0052] 260 Residual gas separation device 261 Tank

[0053] 261a Separation area 261b Liquid storage area

[0054] 261c Exhaust port 262 Liquid inlet pipe

[0055] 262a / 263a Connection point 263 Liquid outlet pipe DETAILED DESCRIPTION

[0056] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application embodiments can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application embodiments, some technical features well known in the art are not described.

[0057] In order to fully understand the implementation of the present application, a detailed structure will be presented in the following description. Obviously, the implementation of the implementation of the present application is not limited to the specific details familiar to those skilled in the art.

[0058] It should be understood that the purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present application, and the singular forms "a", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. When the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the features, integral bodies, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or combinations thereof.

[0059] Ordinal numbers such as "first" and "second" cited in this application are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself 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 in this application are for illustrative purposes only and are not limiting.

[0060] Hereinafter, specific embodiments of the present application will be described in more detail with reference to the accompanying drawings. These drawings show representative embodiments of the present application and do not limit the present application.

[0061] See also Figure 1In the prior art, the electrolytic hydrogen production system 100 includes an electrolyzer 110, which is used to electrolyze alkali solution to generate hydrogen and oxygen. The electrolyzer 110 is connected to an oxygen-side gas-liquid separator 121 via a first delivery pipeline 123, and is connected to a hydrogen-side gas-liquid separator 122 via a second delivery pipeline 124. The oxygen-side gas-liquid separator 121 and the hydrogen-side gas-liquid separator 122 are also connected to the electrolyzer 110 via an alkali solution reflux pipeline 130. A cooling device 140 and a pump 155 are provided in the alkali solution reflux pipeline 130, and the pump 155 is located downstream of the cooling device 140 along the alkali solution reflux direction in the alkali solution reflux pipeline 130. The oxygen-side gas-liquid separator 121 has a gas phase outlet 121a, and the hydrogen-side gas-liquid separator 122 has a gas phase outlet 122a. The gas phase outlet 121a is connected to a discharge pipeline, and a detection component 151 is provided at the discharge pipeline. It can be understood that the discharge pipeline also has a discharge outlet 151a. The gas phase outlet 122a at the hydrogen side gas-liquid separator 122 is connected to a purification device to purify the collected hydrogen. In addition, the electrolytic hydrogen production system 100 also has a water replenishment tank 153 and an alkali replenishment tank 154 connected to the hydrogen side gas-liquid separator 122.

[0062] The control principle of the prior art hydrogen production system 100 is briefly described below.

[0063] The electrolyzer 110 electrolyzes the alkaline solution to generate hydrogen and oxygen. Oxygen enters the oxygen-side gas-liquid separator 121 via the first delivery pipeline 123; correspondingly, hydrogen enters the hydrogen-side gas-liquid separator 122 via the second delivery pipeline 124. Hydrogen is convenient for collection and utilization after being processed by the purification device 152, and a certain amount of hydrogen still exists in the oxygen after being processed by the oxygen-side gas-liquid separator 121. The detection component 151 detects the hydrogen content in the oxygen from the oxygen-side gas-liquid separator 121. It can be understood that the electrolytic hydrogen production system 100 includes a control device, and the detection component 151 will feed back the detection results to the control device to control the operation and stop of the electrolytic hydrogen production system 100.

[0064] It should be noted that the solubility of gas in liquid (including the solubility of hydrogen and oxygen in electrolyte) is related to temperature. When the temperature is low, the electrolyte can dissolve more hydrogen and oxygen. When the temperature is high, the solubility of the gas is low, which is conducive to release from the solution. In the process of alkali liquid flowing back from the gas-liquid separation device 120 to the electrolyzer 110 via the alkali liquid reflux line 130, it is necessary to pass through the cooling device 140 for cooling, which leads to an increase in the gas concentration in the electrolyte. By reasonably setting the initial value of the hydrogen content in oxygen at the gas phase outlet 121a, the electrolytic hydrogen production system 100 can be controlled to stop running in time through the orderly cooperation of the detection component 151 and the control device. However, in the hydrogen production system 100, when the hydrogen content in the oxygen at the gas phase outlet 121a exceeds the initial value set above, the hydrogen production system 100 can only stop running regardless of how much it exceeds the initial value. This will cause the hydrogen production system 100 to need to be frequently shut down during actual use, seriously affecting the efficiency of hydrogen production by electrolysis, and easily causing the failure rate of the hydrogen production system 100 to increase significantly.

[0065] Based on this, the present application provides an electrolysis hydrogen production system.

[0066] See also Figure 2 , the electrolytic hydrogen production system 200 includes an electrolyzer 110, a gas-liquid separation device 120, a cooling device 140, a residual gas separation device 260, a detection component 151 and a control device. Specifically, an alkali solution reflux pipeline 130 is provided between the gas-liquid separation device 120 and the electrolyzer 110. The cooling device 140 is provided in the alkali solution reflux pipeline 130. The residual gas separation device 260 is connected to the alkali solution reflux pipeline 130, and along the reflux direction of the alkali solution in the alkali solution reflux pipeline 130, the two ends of the residual gas separation device 260 connected to the alkali solution reflux pipeline 130 are respectively located upstream and downstream of the cooling device 140. The detection component 151 is used to detect the hydrogen content in the oxygen product of the electrolytic hydrogen production system 200. The control device is electrically connected to the detection component 151, and the control device is at least used to control the cooling device 140 and the residual gas separation device 260 to not be in an open state at the same time according to the detection value of the detection component 151.

[0067] According to the electrolytic hydrogen production system 200 of the present solution, it is possible to continuously monitor the hydrogen content in the oxygen product of the electrolytic hydrogen production system and adjust the operating parameters accordingly, which greatly reduces the explosion risk associated with hydrogen, so that the electrolytic hydrogen production system 200 always operates within a safe range. In addition, by controlling the opening and closing of the cooling device 140, the temperature of the electrolyte can be adjusted and the dissolved gas can be effectively removed, which can not only prevent the accumulation of gas leading to inefficiency or dangerous situations, but also ensure that the electrolysis process is more efficient and stable. In addition, the electrolytic hydrogen production system 100 of the prior art may need to shut down when an unsafe hydrogen content is detected. However, the electrolytic hydrogen production system 200 provided in the present solution can be designed to dynamically adjust conditions (such as heating the electrolyte) so that it can continue to operate uninterruptedly; this improves productivity and reduces operating costs.

[0068] See also Figure 2 and Figure 3 , a liquid inlet and a liquid outlet are respectively provided at both ends of the residual gas separation device 260. The residual gas separation device 260 also includes a liquid inlet pipeline 262 and a liquid outlet pipeline 263; the liquid inlet is connected to the alkali solution reflux pipeline 130 through the liquid inlet pipeline 262, and the liquid outlet is connected to the alkali solution reflux pipeline 130 through the liquid outlet pipeline 263. It should be noted that, along the reflux direction of the alkali solution in the alkali solution reflux pipeline 130, the connection point 262a between the liquid inlet pipeline 262 and the alkali solution reflux pipeline 130 is located upstream of the cooling device 140, and the connection point 263a between the liquid outlet pipeline 263 and the alkali solution reflux pipeline 130 is located downstream of the cooling device 140. In other words, the main difference between the electrolysis hydrogen production system 200 provided in the present application and the electrolysis hydrogen production system 100 of the prior art is that: on the basis of the electrolysis hydrogen production system 100 of the prior art, a residual gas separation device 260 is added to the alkali solution reflux pipeline 130, and the residual gas separation device 260 is arranged in parallel with the cooling device 140.

[0069] Please continue reading Figure 2 and Figure 3 , the residual gas separation device 260 includes a tank body 261, and the tank body 261 includes a separation area 261a and a liquid storage area 261b. Further, along the height direction of the tank body 261, the separation area 261a is located above the liquid storage area 261b, the liquid inlet is located above the separation area 261a, and the liquid outlet is opened in the liquid storage area 261b. A filler is provided in the separation area 261a, and the filler is used for allowing the alkali solution to pass through, or for allowing the refluxed alkali solution to pass through, so that the gas in the alkali solution is separated from the alkali solution. The tank body 261 is also provided with an exhaust port 261c, and the exhaust port 261c is located at the top of the tank body 261; and / or, the residual gas separation device 260 also includes a sprayer, which is located inside the tank body 261, and the sprayer is connected to the liquid inlet.

[0070] See also Figure 3, the electrolysis hydrogen production system 200 also includes a first control valve 256, which is arranged in pairs. It should be noted that one of the first control valves 256 is arranged on the liquid inlet pipeline 262, and the other of the first control valves 256 is arranged on the liquid outlet pipeline 263. The first control valve 256 is electrically connected to the control device, and the control device is used to control the opening and closing of the first control valve 256 to control the opening or closing of the residual gas separation device 260. The electrolysis hydrogen production system 200 also includes a second control valve 257, which is arranged on the alkali solution reflux pipeline 130, and the second control valve 257 is located between the two ends of the residual gas separation device 260 and the alkali solution reflux pipeline 130, or the second control valve 257 is located between the connection point 262a and the connection point 263a. It can be understood that the second control valve 257 is electrically connected to the control device, and the control device is used to control the opening and closing of the second control valve 257 to control the opening or closing of the cooling device 140.

[0071] The opening and closing process of the cooling device 140 and the residual gas separation device 260 will be described below.

[0072] The detection value of the detection component 151 is m;

[0073] When m≥a, the control device controls the entire electrolytic hydrogen production system 200 to stop operating;

[0074] When a>m>b, the control device controls the cooling device 140 to switch to the closed state, and controls the residual gas separation device 260 to switch to the open state;

[0075] When b≥m, the control device controls the cooling device 140 to switch to an on state, and controls the residual gas separation device 260 to switch to a off state.

[0076] That is to say, the detection value m obtained by the detection component 141 is compared with two critical values, for example, a is called the first critical value, and b is called the second critical value. Since the aforementioned detection value m, the first critical value a and the second critical value b are all used to measure the hydrogen content in the oxygen product, the critical values ​​will be different for different electrolytic hydrogen production systems. For example, 4%≤a≤6%, 0.5%≤b≤1%, preferably, a=4%, b=1%. When m≥4%, the control device controls the entire electrolytic hydrogen production system 200 to stop operating; when 4%>m>1%, the control device controls the cooling device 140 to switch to the closed state, and controls the residual gas separation device 260 to switch to the open state; when 1%≥m, the control device controls the cooling device 140 to switch to the open state, and controls the residual gas separation device to switch to the closed state.

[0077] Further, as mentioned above, when a>m>b, the control device controls the cooling device 140 to switch to the closed state, and controls the residual gas separation device 260 to switch to the open state; it should be noted that until c>m, the control device controls the cooling device 140 to switch to the open state, and controls the residual gas separation device 260 to switch to the closed state. It can be understood that b>c. For example, 0.3%≤c≤0.5%, preferably, c=0.4%. When 4%>m>1%, the control device controls the cooling device 140 to switch to the closed state, and controls the residual gas separation device 260 to switch to the open state; until 0.4%>m, the control device controls the cooling device 140 to switch to the open state, and controls the residual gas separation device 260 to switch to the closed state.

[0078] The principle of reducing the hydrogen content in the oxygen product by the residual gas separation device 260 and the cooling device 140 is described below.

[0079] In the process of the alkali liquid flowing back from the gas-liquid separation device 120 to the electrolytic cell 110, it needs to be cooled by the cooling device 140, because the solubility of the gas in the liquid is negatively correlated with the temperature; in other words, after the alkali liquid is cooled by the cooling device, more gas will be dissolved in it, resulting in an increase in the gas concentration in the alkali liquid.

[0080] The critical value of the detection component 151 is set to 4%. When m≥4%, the control device controls the entire electrolytic hydrogen production system 200 to stop operating.

[0081] When 4%>m>1%, the control device controls the cooling device 140 to switch to the closed state, and controls the residual gas separation device 260 to switch to the open state, so that the refluxed alkali liquid does not pass through the cooling device 140, but flows to the residual gas separation device 260. The refluxed alkali liquid sprays down from the top of the filler, and as the alkali liquid flows in the filler, the residual gas dissolved in the refluxed alkali liquid is released, and the residual gas is discharged through the exhaust port 261c, thereby reducing the residual gas dissolved in the refluxed alkali liquid and reducing the hydrogen content in the oxygen. This process utilizes the higher temperature of the refluxed alkali liquid itself, and cooperates with the separation function of the residual gas separation device 260 to release the gas from the alkali liquid and discharge the residual gas separation device 260, which is more economical.

[0082] When 0.4%>m, the control device controls the cooling device 140 to switch to the on state, and controls the residual gas separation device 260 to switch to the off state; accordingly, the temperature of the reflux alkali solution will also be reduced by cooling of the cooling device 140 .

[0083] In general, the electrolysis hydrogen production system 200 continuously monitors the hydrogen concentration. If an unsafe hydrogen concentration is detected, the control device will eliminate the residual gas by adjusting the connectivity between the residual gas separation device 260 and the alkali solution return line 130 to prevent the mixing of hydrogen and oxygen and possible explosion, thereby ensuring stable operation without frequent shutdowns. This method can produce hydrogen more efficiently and continuously.

[0084] Further, the gas-liquid separation device 120 includes an oxygen-side gas-liquid separator 121, which is connected to the oxygen-side outlet of the electrolyzer 110. As mentioned above, the oxygen-side gas-liquid separator 121 has a gas phase outlet 121a, and the detection component 151 is connected to the gas phase outlet 121a to detect the hydrogen content value in the oxygen product output by the oxygen-side gas-liquid separator 121. The electrolytic hydrogen production system 200 also includes an alarm component, wherein the detection component 151 is used to detect the hydrogen content value in the oxygen product output by the oxygen-side gas-liquid separator 121. It can be understood that the alarm component is electrically connected to the detection component 151 and the control device, and the alarm component is used to receive the detection value signal of the detection component 151 and transmit it to the control device. The alarm component is also used to issue an alarm when the detection value of the detection component 151 exceeds a predetermined value, so that the staff can be informed and handled in time.

[0085] According to the electrolytic hydrogen production system of the present application, a specific control method is adopted to adjust operating parameters such as temperature and reflux alkali solution flow rate according to real-time hydrogen concentration data. In this way, even when potentially dangerous conditions are detected, safety can be ensured by adjusting system conditions without stopping production, thereby achieving continuous operation. When a high hydrogen concentration is detected, the electrolytic hydrogen production system can selectively increase the temperature of the reflux alkali solution to remove residual gas, thereby achieving safer operation and reducing the risk of combustion. By continuously monitoring the oxygen output and the hydrogen concentration in the reflux alkali solution and adjusting the operating parameters accordingly, the risk of explosion related to hydrogen is greatly reduced. This continuous monitoring and automatic adjustment ensures that the electrolytic hydrogen production system always operates within a safe range. The electrolytic hydrogen production system can adjust the reflux alkali solution temperature according to the hydrogen concentration, thereby more effectively removing dissolved gases. This not only prevents gas accumulation from causing inefficiency or dangerous situations, but also ensures that the electrolysis process is more efficient and stable. The electrolytic hydrogen production system of the prior art may need to shut down when an unsafe hydrogen content is detected. However, the electrolytic hydrogen production system provided by the present application can dynamically adjust the conditions so that it can continue to operate uninterruptedly. This increases productivity and reduces operating costs. Because the electrolysis hydrogen production system is optimized to effectively utilize renewable energy sources such as wind and solar power, it supports the production of green hydrogen. This helps reduce carbon emissions and is consistent with global efforts to shift to sustainable energy solutions. The design features of the gas-liquid separation unit and caustic soda reflux can be adjusted and expanded according to different operating scales and needs, making the electrolysis hydrogen production system suitable for a variety of industrial applications. By mastering real-time data on gas concentrations and system performance, predictive maintenance can be performed instead of reactive maintenance. This not only extends the service life of the equipment, but also reduces unexpected maintenance costs.

[0086] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used herein are only for describing specific implementation purposes and are not intended to limit this application. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0087] The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present application to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the present application, and these variations and modifications all fall within the scope of protection claimed in the present application.

Claims

1. A hydrogen production system by electrolysis, characterized in that: The electrolysis hydrogen production system comprises: Electrolyzer; A gas-liquid separation device, wherein an alkaline solution reflux pipeline is provided between the gas-liquid separation device and the electrolytic cell; A cooling device, wherein the cooling device is arranged in the alkali solution reflux pipeline; A residual gas separation device, the residual gas separation device is connected to the alkali solution reflux pipeline, and along the reflux direction of the alkali solution in the alkali solution reflux pipeline, two ends of the residual gas separation device connected to the alkali solution reflux pipeline are respectively located upstream and downstream of the cooling device; A detection component, the detection component is used to detect the hydrogen content in the oxygen product of the electrolytic hydrogen production system; and A control device is electrically connected to the detection component, and the control device is at least used to control the cooling device and the residual gas separation device to be in different open states at the same time according to the detection value of the detection component.

2. The electrolysis hydrogen production system according to claim 1, characterized in that: The detection value of the detection component is m; When m≥a, the control device controls the entire electrolysis hydrogen production system to stop operating; When a>m>b, the control device controls the cooling device to switch to a closed state, and controls the residual gas separation device to switch to an open state; When b≥m, the control device controls the cooling device to switch to an on state, and controls the residual gas separation device to switch to a off state.

3. The electrolysis hydrogen production system according to claim 2, characterized in that: When a>m>b, the control device controls the cooling device to switch to the closed state, and controls the residual gas separation device to switch to the open state, until c>m, the control device controls the cooling device to switch to the open state, and controls the residual gas separation device to switch to the closed state; Among them, b>c.

4. The electrolysis hydrogen production system according to claim 1, characterized in that: The gas-liquid separation device comprises an oxygen-side gas-liquid separator, and the oxygen-side gas-liquid separator is communicated with the oxygen-side outlet of the electrolytic cell; The oxygen-side gas-liquid separator has a gas phase outlet, and the detection component is connected to the gas phase outlet to detect the hydrogen content value in the oxygen product output from the oxygen-side gas-liquid separator.

5. The electrolysis hydrogen production system according to claim 4, characterized in that: The electrolysis hydrogen production system also includes an alarm component; The alarm component is electrically connected to the detection component and the control device, and the alarm component is used to receive the detection value signal of the detection component and transmit it to the control device; The alarm component is also used to issue an alarm when the detection value of the detection component exceeds a preset value.

6. The electrolysis hydrogen production system according to claim 1, characterized in that: The two ends of the residual gas separation device are respectively provided with a liquid inlet and a liquid outlet; The residual gas separation device further comprises a liquid inlet pipeline and a liquid outlet pipeline, the liquid inlet is connected to the alkali solution reflux pipeline via the liquid inlet pipeline, and the liquid outlet is connected to the alkali solution reflux pipeline via the liquid outlet pipeline; Among them, along the reflux direction of the alkali solution in the alkali solution reflux pipeline, the connection point between the liquid inlet pipeline and the alkali solution reflux pipeline is located upstream of the cooling device, and the connection point between the liquid outlet pipeline and the alkali solution reflux pipeline is located downstream of the cooling device.

7. The electrolysis hydrogen production system according to claim 6, characterized in that: The residual gas separation device comprises a tank body, and the tank body comprises a separation area and a liquid storage area; Along the height direction of the tank body, the separation area is located above the liquid storage area, the liquid inlet is located above the separation area, and the liquid outlet is opened in the liquid storage area; A filler is arranged in the separation zone, and the filler is used for allowing the alkali solution to pass through so that the gas in the alkali solution is separated from the alkali solution.

8. The electrolysis hydrogen production system according to claim 7, characterized in that: The tank body is further provided with an exhaust port, and the exhaust port is located at the top of the tank body; and / or, The residual gas separation device further comprises a sprayer, wherein the sprayer is located inside the tank body and is communicated with the liquid inlet.

9. The electrolysis hydrogen production system according to claim 6, characterized in that: The electrolysis hydrogen production system further includes first control valves, which are arranged in pairs; One of the first control valves is disposed on the liquid inlet pipeline, and the other of the first control valves is disposed on the liquid outlet pipeline; The first control valve is electrically connected to the control device, and the control device is used to control the opening and closing of the first control valve to control the opening or closing of the residual gas separation device.

10. The electrolysis hydrogen production system according to claim 1, characterized in that: The electrolytic hydrogen production system further includes a second control valve, which is arranged on the alkali solution reflux pipeline; The second control valve is located between the two ends of the residual gas separation device connected to the alkali solution reflux pipeline; The second control valve is electrically connected to the control device, and the control device is used to control the opening and closing of the second control valve to control the cooling device to be turned on or off.

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