Hydrogen production system

Abstract

The application discloses a hydrogen production system, which comprises an electrolytic cell, a gas-liquid separation device, a circulating main pipeline, a purification branch, a liquid supplement branch, a purification device, a liquid supplement tank and a first analysis device; the electrolytic cell is provided with an electrolyte inlet and a mixture outlet; the gas-liquid separation device is provided with an electrolyte outlet and a mixture inlet communicated with the mixture outlet; two ends of the circulating main pipeline are communicated with the electrolyte outlet and the electrolyte inlet respectively; a cooler and a first power pump are arranged on the circulating main pipeline; the purification branch is connected to the circulating main pipeline and provided with a first stop valve; the liquid supplement branch is connected to the circulating main pipeline and provided with a second stop valve and a second power pump; a liquid inlet and a liquid outlet of the purification device are communicated with the purification branch and the liquid supplement tank respectively; the liquid supplement tank is arranged on the liquid supplement branch; the first analysis device is arranged on the circulating main pipeline, and the first stop valve, the second stop valve and the second power pump are all communicated with the first analysis device. The technical scheme can improve the problem of electrolysis efficiency reduction of the hydrogen production system.

Description

Technical Field

[0001] This application relates to the field of hydrogen production technology, and in particular to a hydrogen production system. Background Technology

[0002] Electrolysis is an important method for producing hydrogen. However, after a hydrogen production system has been running for a long time, impurities can accumulate in the system's components, contaminating the electrolyte and leading to a decrease in electrolysis efficiency. Utility Model Content

[0003] The main objective of this application is to propose a hydrogen production system designed to improve the problem of declining electrolysis efficiency.

[0004] To achieve the above objectives, the hydrogen production system proposed in this application includes an electrolyzer, a gas-liquid separator, a main circulation pipeline, a purification branch, a replenishment branch, a purification device, a replenishment tank, and a first analytical device. The electrolyzer has an electrolyte inlet and a mixture outlet. The gas-liquid separator has a mixture inlet and an electrolyte outlet, with the mixture inlet connected to the mixture outlet. One end of the main circulation pipeline is connected to the electrolyte outlet, and the other end is connected to the electrolyte inlet. A cooler and a first power pump are provided on the main circulation pipeline. The purification branch is connected to the main circulation pipeline and has a first shut-off valve. The replenishment branch is connected to the main circulation pipeline and has a second shut-off valve and a second power pump. The purification device has an inlet and a outlet, with the inlet connected to the purification branch. The replenishment tank is located on the replenishment branch and connected to the outlet. The first analytical device is located on the main circulation pipeline, and the first shut-off valve, the second shut-off valve, and the second power pump are all communicatively connected to the first analytical device.

[0005] In one embodiment, the replenishment tank is equipped with a liquid level sensor; the drain outlet is connected to the replenishment tank via a connecting pipe, and a third shut-off valve is provided on the connecting pipe, the third shut-off valve being communicatively connected to the liquid level sensor.

[0006] In one embodiment, the purification device includes: A flash evaporator, having the liquid inlet and a liquid outlet; and A purification tank having a liquid inlet and a liquid outlet, wherein the liquid inlet is connected to the liquid outlet.

[0007] In one embodiment, there are multiple purification tanks, which are connected in series or in parallel.

[0008] In one embodiment, the hydrogen production system further includes a heating device, which is located on the replenishment tank or on the replenishment branch.

[0009] In one embodiment, a first flow regulating valve is further provided on the main circulation pipeline, and the first flow regulating valve is communicatively connected to the first analysis device; And / or, a fourth shut-off valve is provided on the main circulation pipeline, and the fourth shut-off valve is communicatively connected to the first analysis device.

[0010] In one embodiment, the second power pump is a variable frequency power pump; the main circulation pipeline includes a first branch located between the replenishment branch and the electrolytic cell, and the cooler and the first power pump are located on the first branch; a flow meter is also provided on the first branch, and the flow meter is communicatively connected to the variable frequency power pump.

[0011] In one embodiment, a thermometer is also provided on the first branch, the cooler has a coolant inlet pipe, a second flow regulating valve is provided on the coolant inlet pipe, and the second flow regulating valve is communicatively connected to the thermometer; And / or, the hydrogen production system further includes a second analysis device, which is disposed on the first branch and located between the cooler and the electrolyzer; And / or, the hydrogen production system further includes a filter, which is disposed on the first branch and located between the cooler and the electrolyzer.

[0012] In one embodiment, the mixture outlet includes a hydrogen-side outlet and an oxygen-side outlet; The gas-liquid separation device includes a hydrogen separator and an oxygen separator. The mixture inlet includes a first mixture inlet and a second mixture inlet. The first mixture inlet is located in the hydrogen separator and is connected to the hydrogen-side outlet. The second mixture inlet is located in the oxygen separator and is connected to the oxygen-side outlet. The electrolyte outlet includes a first electrolyte outlet and a second electrolyte outlet. The first electrolyte outlet is located in the hydrogen separator, and the second electrolyte outlet is located in the oxygen separator. Both the first electrolyte outlet and the second electrolyte outlet are connected to the main circulation pipeline.

[0013] In one embodiment, the main loop circuit includes: A first circulation pipeline, one end of which is connected to the first electrolyte outlet, and the other end of which is connected to the electrolyte inlet; and The second circulation pipeline has one end connected to the second electrolyte outlet and the other end connected to the electrolyte inlet; both the first circulation pipeline and the second circulation pipeline are connected to the purification branch and the replenishment branch.

[0014] This technical solution connects the mixture inlet of the gas-liquid separator to the mixture outlet of the electrolytic cell, and one end of the circulation main pipeline is connected to the electrolyte outlet of the gas-liquid separator, while the other end is connected to the electrolyte inlet of the electrolytic cell. This allows the electrolyte separated in the gas-liquid separator to flow back into the electrolytic cell, thereby improving the utilization rate of the electrolyte and reducing waste. A cooler is installed on the circulation main pipeline to ensure a suitable temperature for the electrolyte entering the electrolytic cell. A first power pump is installed on the circulation main pipeline to facilitate the rapid flow of electrolyte into the electrolytic cell, improving the electrolyte circulation efficiency. By connecting both the purification branch and the replenishment branch to the main circulation line, with the inlet of the purification device connected to the purification branch and the outlet of the purification device connected to the replenishment tank of the replenishment branch, at least a portion of the electrolyte in the main circulation line can enter the purification device for purification through the purification branch. The purified electrolyte then enters the replenishment tank, ensuring that the electrolyte in the replenishment tank is always of good quality. Therefore, the liquid in the replenishment tank does not need to be filtered before entering the main circulation line, guaranteeing that the electrolyte entering the main circulation line from the replenishment tank is of qualified quality. This reduces the impact of impurities in the hydrogen production system, improves the quality of the electrolyte, and thus increases electrolysis efficiency. Furthermore, this setup allows for online monitoring, analysis, and purification without shutting down the electrolyzer, cooler, and first power pump. Additionally, by installing a first analysis device on the main circulation line, the hydrogen production system of this application can automatically analyze the quality of the electrolyte in the main circulation line. By setting a first shut-off valve on the purification branch and a second shut-off valve and a second power pump on the replenishment branch, and by having the first shut-off valve, the second shut-off valve and the second power pump all communicate with the first analysis device, the first shut-off valve, the second shut-off valve and the second power pump can be controlled by the analysis results of the first analysis device to control whether the first shut-off valve, the second shut-off valve and the second power pump are opened, thereby achieving the effect of automatically controlling whether at least part of the electrolyte in the circulation main pipeline is purified. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1This is a schematic diagram of the structure of an embodiment of the hydrogen production system of this application; Figure 2 This is a schematic diagram of another example of the hydrogen production system of this application.

[0017] Explanation of icon numbers: 100. Electrolyte cell; 110. Electrolyte inlet; 120. Mixture outlet; 121. Hydrogen-side outlet; 122. Oxygen-side outlet; 200, Gas-liquid separation device; 210, Hydrogen separator; 211, First mixture inlet; 212, First electrolyte outlet; 220, Oxygen separator; 221, Second mixture inlet; 222, Second electrolyte outlet; 300. Purification device; 310. Flash tank; 311. Liquid inlet; 320. Purification tank; 321. Liquid outlet; 400. Liquid replenishment tank; 410. Liquid level sensor; 510. First analytical apparatus; 520. Second analytical apparatus; 600. Cooler; 610. Coolant inlet pipe; 710. First power pump; 720. Second power pump; 800. Thermometer; 900, Filter; 10. Main circulation pipeline; 11. First circulation pipeline; 12. Second circulation pipeline; 101. First branch pipeline; 20. Clean up the branch roads; 30. Infusion branch; 40. Connecting pipelines; 51. First shut-off valve; 52. Second shut-off valve; 53. Third shut-off valve; 54. Fourth shut-off valve; 55. First flow regulating valve; 56. Second flow regulating valve; 57. Flow meter; 60. Controller.

[0018] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0022] Electrolysis is an important method for producing hydrogen. However, after prolonged operation, impurities can accumulate in the system's components, contaminating the electrolyte and leading to decreased electrolysis efficiency. For example, the catalyst sprayed on the electrodes of an alkaline electrolyzer can detach after long-term operation, and other impurities within the system can also contaminate the electrolyte, causing a series of problems such as decreased electrolysis efficiency. Metal ions released during the operation of polymer proton exchange membrane electrolyzers and related equipment can increase the conductivity of the electrolyzed pure water; excessive conductivity can severely affect the efficiency and lifespan of the polymer proton exchange membrane electrolyzer.

[0023] In existing technologies, alkaline water electrolysis systems remove impurities from the electrolyte by setting up filters, but powder-level impurities are difficult to remove. After sampling, the electrolyte concentration and other parameters are analyzed in the laboratory, and then corresponding operations such as adding alkali are performed. This is a single function and the whole process is time-consuming. Although polymer proton exchange membrane electrolyzer water electrolysis systems can monitor the electrolyte water quality online with a conductivity meter, the ion adsorption purification process is slow, or continuous online purification requires repeated resin replacement due to resin lifespan limitations. At the same time, the resin can only solve the problem of excessive ions and cannot deal with electrolyte quality problems caused by microorganisms, powder, and other impurities.

[0024] To address the issue of declining electrolysis efficiency, this application proposes a hydrogen production system.

[0025] like Figure 1As shown, in the technical solution of this application, the hydrogen production system includes an electrolyzer 100, a gas-liquid separator 200, a main circulation pipeline 10, a purification branch pipeline 20, a replenishment branch pipeline 30, a purification device 300, a replenishment tank 400, and a first analysis device 510; the electrolyzer 100 has an electrolyte inlet 110 and a mixture outlet 120; the gas-liquid separator 200 has a mixture inlet and an electrolyte outlet, with the mixture inlet and mixture outlet 120 connected; one end of the main circulation pipeline 10 is connected to the electrolyte outlet, and the other end is connected to the electrolyte inlet 110; a cooler 600 and a first power pump are provided on the main circulation pipeline 10. 710; Purification branch 20 is connected to circulation main line 10, and a first shut-off valve 51 is provided on purification branch 20; replenishment branch 30 is connected to circulation main line 10, and a second shut-off valve 52 and a second power pump 720 are provided on replenishment branch 30; purification device 300 has inlet 311 and outlet 321, and inlet 311 is connected to purification branch 20; replenishment tank 400 is provided on replenishment branch 30 and is connected to outlet 321; first analysis device 510 is provided on circulation main line 10, and the first shut-off valve 51, the second shut-off valve 52 and the second power pump 720 are all communicatively connected to the first analysis device 510.

[0026] In the electrolysis process, the electrolytic cell 100 is the main equipment. The electrolytic cell 100 has an electrolyte inlet 110 for supplying the electrolyte, thus providing the material basis for the electrolysis process. The electrolytic cell 100 also has a mixture outlet 120, the mixture comprising gas and electrolyte carried in the gas. The electrolysis products after electrolysis are discharged through the mixture outlet 120. The gas-liquid separator 200 includes a mixture inlet connected to the mixture outlet 120 of the electrolytic cell 100, enabling the gas-liquid separator 200 to separate the mixture discharged from the mixture outlet 120 into gas and liquid components, improving the purity of the extracted gas. The liquid produced after gas-liquid separation can flow out through the electrolyte outlet of the gas-liquid separator 200. The hydrogen production system also includes a main circulation pipeline 10, one end of which is connected to the electrolyte outlet, and the other end to the electrolyte inlet, thereby improving the utilization rate of the electrolyte and avoiding the waste of large amounts of electrolyte. Since the electrolyte entering the electrolytic cell 100 needs to be maintained within a suitable temperature range, and the temperature of the electrolyte after separation by the gas-liquid separator 200 is relatively high, a cooler 600 can be installed on the circulation main pipeline 10 to reduce the temperature of the electrolyte flowing out of the gas-liquid separator 200, thereby ensuring that the temperature of the electrolyte entering the electrolytic cell 100 is within the preset temperature range. A first power pump 710 is also provided on the circulation main pipeline 10, which facilitates the flow of electrolyte from the circulation main pipeline 10 into the electrolytic cell 100, allowing for a more flexible setting of the relative positional relationship between the electrolytic cell 100 and the circulation main pipeline 10.

[0027] The purification branch 20 is connected to the main circulation line 10, meaning that the purification branch 20 is a branch line branching off from a certain location in the main circulation line 10, that is, at least one port of the purification branch 20 is connected to the main circulation line 10. Similarly, the replenishment branch 30 is connected to the main circulation line 10, meaning that the replenishment branch 30 is a branch line branching off from a certain location in the main circulation line 10, that is, at least one port of the purification branch 20 is connected to the main circulation line 10. This application also includes a purification device 300, the inlet 311 of which is connected to the purification branch 20, so that at least a portion of the electrolyte in the main circulation line 10 can enter the purification device 300 through the purification branch 20, thereby achieving the purification effect on the electrolyte. Furthermore, the replenishment tank 400 is located in the replenishment branch 30 and is connected to the drain port 321 of the purification device 300. The electrolyte purified by the purification device 300 can then be stored in the replenishment tank 400. When the main circulation line 10 needs replenishment, it can be replenished from the replenishment tank 400. The purified electrolyte in the replenishment tank 400 can then enter the main circulation line 10 through the replenishment branch 30. Further, to prevent electrolyte in the main circulation line 10 from entering the replenishment tank 400 directly through the replenishment branch 30 without being purified by the purification device 300, a one-way valve can be installed on the replenishment branch 30. This one-way valve allows electrolyte in the replenishment tank 400 to flow into the main circulation line 10, but prevents electrolyte in the main circulation line 10 from flowing into the replenishment tank 400.

[0028] When purifying the electrolyte, the purification device 300 can select an appropriate purification method based on the actual operating conditions. For example, if the hydrogen production system contains only solid particulate impurities, the purification device 300 may only include a filter device for filtering solid impurities. This filter device can be selected with an appropriate mesh size according to the particle size. It should be noted that the filter device used to filter solid particles is common knowledge to those skilled in the art, and its structure and principle will not be described in detail here. Alternatively, when the electrolyzer 100 is a polymer proton exchange membrane electrolyzer 100, metal ions may be precipitated in the hydrogen production system. In this case, an ion adsorption device can be used as the purification device 300. Or, if the hydrogen production system contains both solid particulate impurities and metal ions, the purification device 300 may include a filter component capable of filtering solid particles and an ion adsorption component capable of adsorbing metal ions.

[0029] To facilitate monitoring of electrolyte quality, the hydrogen production system of this application further includes a first analytical device 510. This first analytical device 510 is used to analyze electrolyte parameters, including but not limited to pH value, conductivity, particulate matter content, and water quality. The first analytical device 510 may analyze only one parameter. For example, when the electrolyzer 100 in the hydrogen production system is an alkaline electrolyzer 100, the first analytical device 510 may only analyze particulate matter content; when the electrolyzer 100 in the hydrogen production system is a polymer proton exchange membrane electrolyzer 100, the first analytical device 510 may only analyze conductivity, and so on. Alternatively, the first analytical device 510 may analyze at least two parameters. It should be noted that the analytical devices for each parameter of the electrolyte in the system are common knowledge in the art and will not be described in detail here.

[0030] To achieve automatic monitoring, analysis, and purification, the first shut-off valve 51 on the purification branch 20, the second shut-off valve 52 on the replenishment branch 30, and the second power pump 720 are all communicatively connected to the first analysis device 510. The analysis results from the first analysis device 510 control whether the first shut-off valve 51, the second shut-off valve 52, and the second power pump 720 are opened. Specifically, when the first analysis device 510 analyzes that the quality of the electrolyte in the main circulation branch 10 is unqualified, it sends the result to the controller 60, which then controls the first shut-off valve 51, the second shut-off valve 52, and the second power pump 720 to open. This allows at least a portion of the electrolyte to enter the purification device 300 for purification, ensuring that the electrolyte flowing out of the replenishment tank 400 is of good quality. Specifically, when the first analytical device 510 determines that the quality of the electrolyte on the main circulation pipeline 10 is unqualified, this application can control all the electrolyte on the main circulation pipeline 10 to enter the purification device 300 for purification; it can also control a portion of the electrolyte on the main circulation pipeline 10 to enter the purification device 300 for purification, while the other portion of the electrolyte flows directly to the cooler 600; or when the first analytical device 510 determines that the quality of the electrolyte on the main circulation pipeline 10 is qualified, it can control both the first shut-off valve 51 and the second shut-off valve 52 to close, thereby ensuring that all the electrolyte on the main circulation pipeline 10 directly enters the cooler 600 for cooling. Specifically, the first analytical device 510 can be located anywhere on the main circulation pipeline 10, for example, it can be located at the front end of the bypass purification branch 20 of the main circulation pipeline 10, or between the bypass purification branch 20 and the bypass replenishment branch 30 of the main circulation pipeline 10, or between the bypass replenishment branch 30 and the cooler 600, etc.

[0031] The technical solution of this application connects the mixture inlet of the gas-liquid separator 200 to the mixture outlet 120 of the electrolytic cell 100, and one end of the circulation main pipeline 10 is connected to the electrolyte outlet of the gas-liquid separator 200, while the other end is connected to the electrolyte inlet 110 of the electrolytic cell 100. This allows the electrolyte separated in the gas-liquid separator 200 to flow back into the electrolytic cell 100, thereby improving the utilization rate of the electrolyte and reducing electrolyte waste. The presence of a cooler 600 on the circulation main pipeline 10 ensures a suitable temperature for the electrolyte entering the electrolytic cell 100. The installation of a first power pump 710 on the circulation main pipeline 10 facilitates the rapid flow of electrolyte from the circulation main pipeline 10 into the electrolytic cell 100, improving the electrolyte circulation efficiency. By connecting both the purification branch 20 and the replenishment branch 30 to the main circulation pipeline 10, connecting the inlet 311 of the purification device 300 to the purification branch 20, and connecting the outlet 321 of the purification device 300 to the replenishment tank 400 of the replenishment branch 30, at least a portion of the electrolyte in the main circulation pipeline 10 can enter the purification device 300 for purification through the purification branch 20. The purified electrolyte then enters the replenishment tank 400, thus ensuring that the electrolyte in the replenishment tank 400 is always of good quality. Therefore, the liquid in the replenishment tank 400 does not need to be filtered before entering the main circulation pipeline 10, ensuring that the electrolyte entering the main circulation pipeline 10 from the replenishment tank 400 is directly of qualified quality. This reduces the influence of impurities in the hydrogen production system, improves the quality of the electrolyte, and thus improves the electrolysis efficiency. Furthermore, this setup allows for online monitoring, analysis, and purification of the process without shutting down the electrolyzer 100, cooler 600, and first power pump 710. Furthermore, by installing a first analysis device 510 on the main circulation pipeline 10, the hydrogen production system of this application can automatically analyze the quality of the electrolyte on the main circulation pipeline 10 through the first analysis device 510. By installing a first shut-off valve 51 on the purification branch 20 and a second shut-off valve 52 and a second power pump 720 on the replenishment branch 30, and by having the first shut-off valve 51, the second shut-off valve 52 and the second power pump 720 all communicatively connected to the first analysis device 510, the analysis results of the first analysis device 510 can be used to control whether the first shut-off valve 51, the second shut-off valve 52 and the second power pump 720 are opened, thereby achieving the effect of automatically controlling whether at least a portion of the electrolyte in the main circulation pipeline 10 is purified.

[0032] like Figure 1 As shown, in some embodiments of this application, a liquid level sensor 410 is provided on the replenishment tank 400; the drain port 321 is connected to the replenishment tank 400 through a connecting pipe 40, and a third shut-off valve 53 is provided on the connecting pipe 40, which is communicatively connected to the liquid level sensor 410.

[0033] By installing a level sensor 410 on the replenishment tank 400, the electrolyte level inside the replenishment tank 400 can be monitored. It should be noted that the level sensor 410 is common knowledge in the art and will not be described in detail here.

[0034] By connecting the drain port 321 of the purification device 300 to the replenishment tank 400 via a connecting pipe 40, and by providing a third shut-off valve 53 on the connecting pipe 40, the opening and closing state of the third shut-off valve 53 can be used to control the flow of the connecting pipe 40. Specifically, when the third shut-off valve 53 is open, the connecting pipe 40 is connected, and the electrolyte in the purification device 300 can flow into the replenishment tank 400; when the third shut-off valve 53 is closed, the connecting pipe 40 is disconnected, and the electrolyte in the purification device 300 cannot flow into the replenishment tank 400.

[0035] By communicating with the third shut-off valve 53 and the level sensor 410, the opening and closing of the third shut-off valve 53 can be controlled by the level of the electrolyte in the replenishment tank 400 detected by the level sensor 410, thereby controlling whether the electrolyte in the purification device 300 can flow to the replenishment tank 400. Specifically, when the level sensor 410 detects a high level of electrolyte in the replenishment tank 400, it indicates that the electrolyte capacity in the replenishment tank 400 is sufficient. At this time, the third shut-off valve 53 can be kept closed to improve replenishment efficiency. When the level sensor 410 detects a low level of electrolyte in the replenishment tank 400, it indicates that the electrolyte capacity in the replenishment tank 400 is insufficient. At this time, the third shut-off valve 53 can be kept open, allowing the electrolyte in the purification device 300 to flow to the replenishment tank 400 to replenish the electrolyte capacity in the replenishment tank 400, ensuring that sufficient electrolyte can be replenished to the circulation main pipeline 10.

[0036] like Figure 1 As shown, in some embodiments of this application, the purification device 300 includes a flash tank 310 and a purification tank 320. The flash tank 310 has a liquid inlet 311 and a liquid outlet. The purification tank 320 has a liquid inlet and a liquid outlet 321, and the liquid inlet and the liquid outlet are connected.

[0037] By incorporating a flash evaporator 310, the electrolyte flowing from the main circulation line 10 to the purification branch line 20 undergoes a flash evaporation process, achieving pressure stabilization and partial gas separation. By incorporating a purification tank 320, substantial purification of the electrolyte is achieved. Connecting the liquid inlet of the purification tank 320 to the liquid outlet of the flash evaporator 310 ensures that the electrolyte is pressure-stabilized before entering the purification tank 320, thereby reducing the impact of high-pressure liquid on the purification process.

[0038] like Figure 1 As shown, in some embodiments of this application, there are multiple purification tanks 320, which are connected in series or in parallel.

[0039] It is understandable that impurities in the hydrogen production process may include solids, powders, or metal ions. Different purification tanks 320 can be used for different types of impurities. Therefore, by setting up multiple purification tanks 320, this application allows different types of impurities to be purified separately in each of the multiple purification tanks 320.

[0040] By connecting multiple purification tanks 320 in series, various types of impurities can be purified sequentially. For example, solid particles can be filtered and purified first, and then metal ions can be adsorbed and purified, thereby improving the purification effect.

[0041] By connecting multiple purification tanks 320 in parallel, the hydrogen production system of this application can be applied to different electrolyzers 100, thereby improving the versatility of the hydrogen production system.

[0042] like Figure 1 As shown, in some embodiments of this application, the hydrogen production system further includes a heating device, which is disposed on the replenishment tank 400 or on the replenishment branch 30.

[0043] It is understandable that in environments with low room temperature, the temperature of the electrolyte in the replenishment tank may be too low to meet the temperature requirements of the electrolyte entering the main circulation line 10. Therefore, by installing a heating device on the replenishment tank 400 or the replenishment branch line 30, this application can increase the temperature of the electrolyte entering the main circulation line 10 from the replenishment tank 400, so that the temperature of the electrolyte meets the requirements.

[0044] It should be noted that the heating device can be a heating wire or a heating tank, etc. Heating devices are common knowledge in this field, and their structure and principle will not be described in detail here.

[0045] like Figure 1 As shown, in some embodiments of this application, the main circulation pipeline 10 is further provided with a first flow regulating valve 55, which is communicatively connected to the first analysis device 510.

[0046] By installing a first flow regulating valve 55 on the main circulation pipeline 10, the flow rate of electrolyte distributed to the main circulation pipeline 10 can be adjusted by regulating the opening degree of the first flow regulating valve 55. By communicating with the first flow regulating valve 55 and the first analysis device 510, the analysis results of the first analysis device 510 are sent to the controller 60, and the controller 60 controls the opening degree of the first flow regulating valve 55, thereby achieving the effect of automatically regulating the first flow regulating valve 55.

[0047] Specifically, when the parameters of the electrolyte in the main circulation pipeline 10 are found by the first analysis device 510 to be between a first preset threshold and a second preset threshold, wherein the first preset threshold is less than the second preset threshold, the opening of the first flow regulating valve 55 can be controlled to be in a half-open state, so that a portion of the electrolyte directly enters the cooler 600, and the other portion enters the purification branch 20 and is purified by the purification device 300. When the parameters of the electrolyte in the main circulation pipeline 10 are found by the first analysis device 510 to be greater than the second preset threshold, the opening of the first flow regulating valve 55 can be controlled to be in a maximum state, so that all the electrolyte directly enters the cooler 600.

[0048] like Figure 1 As shown, in some embodiments of this application, a fourth shut-off valve 54 is provided on the main circulation pipeline 10, and the fourth shut-off valve 54 is communicatively connected to the first analysis device 510.

[0049] With this configuration, when the parameters of the electrolyte in the circulating main pipeline 10 are found to be less than the first preset threshold by the first analysis device 510, the fourth shut-off valve 54 can be controlled to be closed, so that all the electrolyte enters the purification device 300 for purification before flowing to the electrolytic cell 100. Otherwise, the fourth shut-off valve 54 can be kept open.

[0050] like Figure 1 As shown, in some embodiments of this application, the second power pump 720 is a variable frequency power pump; the main circulation pipeline 10 includes a first branch 101 located between the replenishment branch 30 and the electrolytic cell 100, and the cooler 600 and the first power pump 710 are located on the first branch 101; a flow meter 57 is also provided on the first branch 101, and the flow meter 57 is communicatively connected to the variable frequency power pump.

[0051] With this configuration, the flow meter 57 can monitor the flow rate of the electrolyte entering the electrolytic cell 100 and control the speed of the variable frequency power pump, thereby adjusting the electrolyte replenishment accordingly.

[0052] like Figure 1 As shown, in some embodiments of this application, a thermometer 800 is also provided on the first branch 101, the cooler 600 has a coolant inlet pipe 610, a second flow regulating valve 56 is provided on the coolant inlet pipe 610, and the second flow regulating valve 56 is communicatively connected to the thermometer 800.

[0053] like Figure 1 As shown, in some embodiments of this application, the hydrogen production system further includes a second analysis device 520, which is disposed on the first branch 101 and located between the cooler 600 and the electrolyzer 100.

[0054] With this setup, the temperature of the mixed electrolyte can be monitored, and the opening of the second flow regulating valve 56 can be adjusted in real time based on the monitored temperature, thereby regulating the flow rate of the coolant entering the cooler 600 and ensuring that the cooling effect of the electrolyte meets the working requirements of the electrolytic cell 100.

[0055] like Figure 1 As shown, in some embodiments of this application, the hydrogen production system further includes a filter 900, which is disposed on the first branch 101 and located between the cooler 600 and the electrolyzer 100.

[0056] With this setup, the electrolyte is filtered again before entering the electrolytic cell 100, thus ensuring that the electrolyte entering the electrolytic cell 100 is of qualified quality.

[0057] Please combine Figure 1 and Figure 2 In some embodiments of this application, the mixture outlet 120 includes a hydrogen-side outlet 121 and an oxygen-side outlet 122; the gas-liquid separation device 200 includes a hydrogen separator 210 and an oxygen separator 220; the mixture inlet includes a first mixture inlet 211 and a second mixture inlet 221, the first mixture inlet 211 is located in the hydrogen separator 210 and communicates with the hydrogen-side outlet 121, and the second mixture inlet 221 is located in the oxygen separator 220 and communicates with the oxygen-side outlet 122; the electrolyte outlet includes a first electrolyte outlet 212 and a second electrolyte outlet 222, the first electrolyte outlet 212 is located in the hydrogen separator 210, and the second electrolyte outlet 222 is located in the oxygen separator 220; both the first electrolyte outlet 212 and the second electrolyte outlet 222 are communicated with the main circulation pipeline 10.

[0058] This configuration allows for the separate separation of hydrogen and oxygen, thereby improving the purity of each. Specifically, the main circulation pipeline 10 can have one or two main circulation pipelines. When there is one main circulation pipeline 10, both the first electrolyte outlet 212 and the second electrolyte outlet 222 are connected to the main circulation pipeline 10. When there are two main circulation pipelines 10, the two main circulation pipelines 10 are connected to the first electrolyte outlet 212 and the second electrolyte outlet 222, respectively.

[0059] like Figure 2 As shown, in some embodiments of this application, the main circulation pipeline 10 includes a first circulation pipeline 11 and a second circulation pipeline 12. One end of the first circulation pipeline 11 is connected to the first electrolyte outlet 212, and the other end is connected to the electrolyte inlet 110. One end of the second circulation pipeline 12 is connected to the second electrolyte outlet 222, and the other end is connected to the electrolyte inlet 110. Both the first circulation pipeline 11 and the second circulation pipeline 12 are connected to a purification branch 20 and a replenishment branch 30.

[0060] This configuration allows the first circulation pipe 11 and the second circulation pipe 12 to be connected to the hydrogen separator 210 and the oxygen separator 220, respectively. This enables the electrolyte separated from the hydrogen separator 210 and the electrolyte separated from the oxygen separator 220 to enter the electrolytic cell 100 or the purification device 300 independently. This achieves the effect of purifying the electrolyte separated from the hydrogen separator 210 and the electrolyte separated from the oxygen separator 220 separately, improving the flexibility of the purification of the electrolytic cell 100 in the hydrogen production system.

[0061] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A hydrogen production system, characterized in that, include: An electrolytic cell having an electrolyte inlet and a mixture outlet; A gas-liquid separation device, the gas-liquid separation device having a mixture inlet and an electrolyte outlet, the mixture inlet being connected to the mixture outlet; A circulation main pipeline, one end of which is connected to the electrolyte outlet and the other end of which is connected to the electrolyte inlet; a cooler and a first power pump are provided on the circulation main pipeline; A purification branch line is connected in parallel to the main circulation line, and a first shut-off valve is provided on the purification branch line; A replenishment branch is provided, which is connected in parallel to the main circulation line. A second shut-off valve and a second power pump are provided on the replenishment branch. A purification device having a liquid inlet and a liquid outlet, wherein the liquid inlet is connected to the purification branch; A replenishment tank is provided in the replenishment branch and is connected to the drain port; The first analysis device is located on the main circulation pipeline, and the first shut-off valve, the second shut-off valve, and the second power pump are all communicatively connected to the first analysis device.

2. The hydrogen production system as described in claim 1, characterized in that, The replenishment tank is equipped with a liquid level sensor; the drain outlet is connected to the replenishment tank through a connecting pipe, and a third shut-off valve is provided on the connecting pipe, which is communicatively connected to the liquid level sensor.

3. The hydrogen production system as described in claim 1, characterized in that, The purification device includes: A flash evaporator, having the liquid inlet and a liquid outlet; and A purification tank having a liquid inlet and a liquid outlet, wherein the liquid inlet is connected to the liquid outlet.

4. The hydrogen production system as described in claim 3, characterized in that, The purification tank is provided in multiple ways, and the multiple purification tanks are arranged in series or in parallel.

5. The hydrogen production system as described in claim 1, characterized in that, The hydrogen production system also includes a heating device, which is located on the replenishment tank or on the replenishment branch.

6. The hydrogen production system as described in claim 1, characterized in that, The main circulation pipeline is also equipped with a first flow regulating valve, which is communicatively connected to the first analysis device. And / or, a fourth shut-off valve is provided on the main circulation pipeline, and the fourth shut-off valve is communicatively connected to the first analysis device.

7. The hydrogen production system as described in claim 1, characterized in that, The second power pump is a variable frequency power pump; the main circulation pipeline includes a first branch located between the replenishment branch and the electrolytic cell, and the cooler and the first power pump are located on the first branch; a flow meter is also provided on the first branch, and the flow meter is communicatively connected to the variable frequency power pump.

8. The hydrogen production system as described in claim 7, characterized in that, A thermometer is also provided on the first branch. The cooler has a coolant inlet pipe and a second flow regulating valve is provided on the coolant inlet pipe. The second flow regulating valve is communicatively connected to the thermometer. And / or, the hydrogen production system further includes a second analysis device, which is disposed on the first branch and located between the cooler and the electrolyzer; And / or, the hydrogen production system further includes a filter, which is disposed on the first branch and located between the cooler and the electrolyzer.

9. The hydrogen production system according to any one of claims 1 to 8, characterized in that, The mixture outlet includes a hydrogen-side outlet and an oxygen-side outlet; The gas-liquid separation device includes a hydrogen separator and an oxygen separator. The mixture inlet includes a first mixture inlet and a second mixture inlet. The first mixture inlet is located in the hydrogen separator and is connected to the hydrogen-side outlet. The second mixture inlet is located in the oxygen separator and is connected to the oxygen-side outlet. The electrolyte outlet includes a first electrolyte outlet and a second electrolyte outlet. The first electrolyte outlet is located in the hydrogen separator, and the second electrolyte outlet is located in the oxygen separator. Both the first electrolyte outlet and the second electrolyte outlet are connected to the main circulation pipeline.

10. The hydrogen production system as described in claim 9, characterized in that, The main circulation pipeline includes: A first circulation pipeline, one end of which is connected to the first electrolyte outlet, and the other end of which is connected to the electrolyte inlet; and The second circulation pipeline has one end connected to the second electrolyte outlet and the other end connected to the electrolyte inlet; both the first circulation pipeline and the second circulation pipeline are connected to the purification branch and the replenishment branch.

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