Water electrolysis hydrogen production system

Abstract

The invention provides a system for producing hydrogen by electrolyzing water, which comprises an electrolytic bath with a gas-liquid outlet; the gas-liquid separator is communicated with the gas-liquid outlet through a gas-liquid pipeline, and the gas-liquid separator is provided with an alkali liquor outlet; the alkali liquor outlet is communicated with the electrolytic bath through a first pipeline, and the first cooler is arranged on the first pipeline; the alkali liquor outlet is communicated with the electrolytic bath through a second pipeline, and the alkali liquor heat preservation box is arranged on the second pipeline; and the alkali liquor outlet is selectively communicated with the electrolytic bath through a first pipeline or a second pipeline. According to the technical scheme, the problem that the energy consumption is increased due to the fact that heating is needed in the heating treatment of the alkali liquor in the electrolytic bath in the related technology is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen production, and in particular to a system for producing hydrogen by electrolysis of water. Background Art

[0002] The water electrolysis hydrogen production system is a device that uses water and electricity as raw materials to produce hydrogen and oxygen. It generally operates at a temperature of 80°C to 90°C and is green, environmentally friendly and pollution-free. The water electrolysis hydrogen production system combined with new energy power generation technology can achieve zero carbon emissions in the entire hydrogen generation process, and has broad development prospects.

[0003] When photovoltaic power generation is used to power the water electrolysis hydrogen production system, carbon emissions can be reduced. However, due to the intermittent power supply of photovoltaic power generation, when there is sunlight during the day, photovoltaic power generation can power the water electrolysis hydrogen production system; when there is no sunlight at night, photovoltaic power generation stops powering the water electrolysis hydrogen production system. In this way, the water electrolysis hydrogen production system needs to be stopped at night and restarted during the day. In addition, the water electrolysis hydrogen production system also needs to be suspended for maintenance during daily use, and the water electrolysis hydrogen production system needs to be restarted after maintenance.

[0004] Since the operation of the water electrolysis hydrogen production system needs to reach a certain temperature, the alkali solution in the electrolyzer of the water electrolysis hydrogen production system needs to be heated before the system is restarted. However, the temperature treatment of the alkali solution in the electrolyzer needs to be heated, which increases the use of energy consumption and increases the operating cost of the water electrolysis hydrogen production system. Summary of the invention

[0005] The main purpose of the present invention is to provide a system for producing hydrogen by electrolyzing water, so as to solve the problem in the related art that the temperature rise treatment of the alkaline solution in the electrolytic cell requires heating, which increases the use of energy consumption.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a water electrolysis hydrogen production system, comprising: an electrolyzer, having a gas-liquid outlet; a gas-liquid separator, the gas-liquid separator is connected to the gas-liquid outlet through a gas-liquid pipeline, and the gas-liquid separator has an alkali liquid outlet; a first cooler, the alkali liquid outlet is connected to the electrolyzer through a first pipeline, and the first cooler is arranged on the first pipeline; an alkali liquid insulation box, the alkali liquid outlet is connected to the electrolyzer through a second pipeline, and the alkali liquid insulation box is arranged on the second pipeline; wherein the alkali liquid outlet can be selectively connected to the electrolyzer through the first pipeline or the second pipeline.

[0007] Furthermore, the water electrolysis hydrogen production system also includes a first alkali solution pump arranged on the second pipeline, and the first alkali solution pump is located downstream of the alkali solution insulation box.

[0008] Furthermore, the water electrolysis hydrogen production system also includes a filter arranged on the first pipeline, and the filter is located downstream of the cooler.

[0009] Furthermore, the water electrolysis hydrogen production system also includes a second alkali liquid pump arranged on the first pipeline, and the second alkali liquid pump is located downstream of the first cooler.

[0010] Furthermore, the gas-liquid separator includes a hydrogen separator and an oxygen separator, and the gas-liquid pipeline includes a first gas-liquid pipeline and a second gas-liquid pipeline, the first gas-liquid pipeline connects the electrolyzer and the hydrogen separator, and the second gas-liquid pipeline connects the electrolyzer and the oxygen separator; the hydrogen separator has a first outlet connected to the alkali liquid outlet, and the oxygen separator has a second outlet connected to the alkali liquid outlet.

[0011] Furthermore, the water electrolysis hydrogen production system also includes a three-way valve connected to the alkali solution outlet, and the three-way valve has a cooling position connecting the alkali solution outlet and the first pipeline and a heat preservation position connecting the alkali solution outlet and the second pipeline.

[0012] Furthermore, the water electrolysis hydrogen production system also includes a first control component that is controllably connected to the three-way valve, and the first control component controls the switching of the three-way valve between a cooling position and a heat preservation position.

[0013] Furthermore, the water electrolysis hydrogen production system also includes a second cooler arranged on the second pipeline, and the second cooler is located downstream of the alkali solution insulation box.

[0014] Furthermore, the water electrolysis hydrogen production system also includes a heater arranged in the alkali solution insulation box.

[0015] Furthermore, the water electrolysis hydrogen production system also includes a second control component and a temperature sensor connected to the second control component by signal, the temperature sensor is arranged in the alkali solution insulation box, and the second control component is controlled and connected to the second cooler and the heater; the temperature sensor detects the temperature in the alkali solution insulation box to transmit the temperature signal to the second control component, and the second control component controls the opening and closing of the second cooler and the heater.

[0016] By applying the technical solution of the present invention, the system for producing hydrogen by electrolysis of water includes: an electrolyzer, a gas-liquid separator, a first cooler and an alkali liquid insulation box. The electrolyzer has a gas-liquid outlet. The gas-liquid separator is connected to the gas-liquid outlet through a gas-liquid pipeline, and the gas-liquid separator has an alkali liquid outlet. The alkali liquid outlet is connected to the electrolyzer through a first pipeline, and the first cooler is arranged on the first pipeline. The alkali liquid outlet is connected to the electrolyzer through a second pipeline, and the alkali liquid insulation box is arranged on the second pipeline. Among them, the alkali liquid outlet can be selectively connected to the electrolyzer through the first pipeline or the second pipeline. Since heat is released during the process of producing hydrogen by electrolysis of water, the temperature of the alkali liquid flowing out of the gas-liquid outlet is relatively high. The gas-liquid mixture formed by the alkali liquid and gas with a higher temperature can be separated by the gas-liquid separator. The alkali liquid outlet of the gas-liquid separator flows out alkali liquid with a higher temperature. When the electrolysis water hydrogen production system is working normally, the alkali liquid outlet is connected to the electrolyzer through the first pipeline, so that the alkali liquid with a higher temperature flowing out of the alkali liquid outlet of the gas-liquid separator can be cooled by the first cooler on the first pipeline, and the alkali liquid with a suitable temperature is transported to the electrolyzer, so as to facilitate the operation of electrolysis water hydrogen production. When the electrolysis water hydrogen production system needs to be suspended, the alkali liquid outlet is connected to the electrolyzer through the second pipeline, so that the alkali liquid with a higher temperature flowing out of the alkali liquid outlet of the gas-liquid separator can be transported to the alkali liquid insulation box by the second pipeline for insulation operation, so that the alkali liquid can be slowly cooled in the insulation box, reducing the operation of heating and heating, reducing the use of energy consumption, and reducing operating costs. Therefore, the technical solution of the present application effectively solves the problem that the temperature rise treatment of the alkali liquid in the electrolyzer in the related art needs to be heated, which increases the use of energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A piping connection diagram of an embodiment of a system for producing hydrogen by electrolysis of water according to the present invention is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Electrolyzer;

[0021] 21. Hydrogen separator; 22. Oxygen separator;

[0022] 31. The first cooler;

[0023] 40. Lye insulation box;

[0024] 51. First alkali liquid pump; 52. Second alkali liquid pump; 53. Filter; 54. Three-way valve;

[0025] 61. First pipeline; 62. Second pipeline;

[0026] 71. A first gas-liquid pipeline; 72. A second gas-liquid pipeline. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0030] In this embodiment, if Figure 1As shown, the water electrolysis hydrogen production system includes: an electrolyzer 10, a gas-liquid separator, a first cooler 31 and an alkali liquid insulation box 40. The electrolyzer 10 has a gas-liquid outlet. The gas-liquid separator is connected to the gas-liquid outlet through a gas-liquid pipeline, and the gas-liquid separator has an alkali liquid outlet. The alkali liquid outlet is connected to the electrolyzer 10 through a first pipeline 61, and the first cooler 31 is arranged on the first pipeline 61. The alkali liquid outlet is connected to the electrolyzer 10 through a second pipeline 62, and the alkali liquid insulation box 40 is arranged on the second pipeline 62. Among them, the alkali liquid outlet can be selectively connected to the electrolyzer 10 through the first pipeline 61 or the second pipeline 62.

[0031] Due to the heat release during the process of hydrogen production by electrolysis of water, the temperature of the alkali liquid flowing out of the gas-liquid outlet is higher. The gas-liquid mixture formed by the alkali liquid with a higher temperature and the gas can be separated by a gas-liquid separator. The alkali liquid outlet of the gas-liquid separator flows out the alkali liquid with a higher temperature. When the hydrogen production system by electrolysis of water works normally, the alkali liquid outlet is connected to the electrolyzer 10 through the first pipeline 61, so that the alkali liquid with a higher temperature flowing out of the alkali liquid outlet of the gas-liquid separator can be cooled by the first cooler 31 on the first pipeline 61, and the alkali liquid with a suitable temperature is transported to the electrolyzer 10, so as to facilitate the operation of hydrogen production by electrolysis of water. When the hydrogen production system by electrolysis of water needs to be suspended, the alkali liquid outlet is connected to the electrolyzer 10 through the second pipeline 62, so that the alkali liquid with a higher temperature flowing out of the alkali liquid outlet of the gas-liquid separator can be transported to the alkali liquid insulation box 40 by the second pipeline 62 for insulation operation, so that the alkali liquid can be slowly cooled in the insulation box, reducing the operation of heating and heating, reducing the use of energy consumption, and reducing the operating cost. Therefore, the technical solution of the present application effectively solves the problem in the related art that the temperature rise treatment of the alkali solution in the electrolytic cell requires heating, which increases the use of energy consumption.

[0032] In this embodiment, the water electrolysis hydrogen production system works normally during the day and stops at night. At night, the alkali solution outlet is connected to the electrolyzer 10 through the second pipeline 62, so that the alkali solution with a higher temperature can be transported to the alkali solution insulation box 40 through the second pipeline 62. When the water electrolysis hydrogen production system needs to be restarted during the day, the alkali solution temperature in the alkali solution insulation box 40 is 50°C to 60°C, and the alkali solution is directly transported from the alkali solution insulation box 40 to the electrolyzer 10 to start hydrogen production, which saves the start-up and stop costs and realizes the efficient and stable operation of the water electrolysis hydrogen production system under long-term intermittent conditions.

[0033] like Figure 1As shown, the water electrolysis hydrogen production system further includes a first alkali liquid pump 51 disposed on the second pipeline 62, and the first alkali liquid pump 51 is located downstream of the alkali liquid insulation tank 40. The first alkali liquid pump 51 is disposed downstream of the alkali liquid insulation tank 40, so that the alkali liquid can be smoothly transported from the gas-liquid separator to the alkali liquid insulation tank 40 for insulation when the water electrolysis hydrogen production system is suspended. The circulation of the alkali liquid is maintained with the assistance of the first alkali liquid pump 51, and the temperature drop caused by the retention of the alkali liquid in the pipeline is avoided too quickly, thereby maintaining the hot standby state of the system during intermittent operation, and preparing for the rapid restart of the water electrolysis hydrogen production system.

[0034] like Figure 1 As shown, the water electrolysis hydrogen production system also includes a filter 53 arranged on the first pipeline 61, and the filter 53 is located downstream of the cooler. The filter 53 is arranged downstream of the cooler to purify the cooled alkali solution and remove particulate matter or other impurities that may be generated during the electrolysis process, so as to extend the service life of the electrolyzer 10 and improve the electrolysis efficiency. Through the arrangement of the filter 53, the cleanliness of the water electrolysis hydrogen production system is ensured, the maintenance cost and equipment wear are reduced, and the overall stability and safety of the water electrolysis hydrogen production system are improved.

[0035] like Figure 1 As shown, the water electrolysis hydrogen production system also includes a second alkali liquid pump 52 arranged on the first pipeline 61, and the second alkali liquid pump 52 is located downstream of the first cooler 31. The second alkali liquid pump 52 is located downstream of the first cooler 31, so that when the water electrolysis hydrogen production system is operating normally, it can effectively promote and accelerate the cooled alkali liquid to return to the electrolyzer 10, shortening the alkali liquid circulation time, thereby improving the working efficiency and response speed of the water electrolysis hydrogen production system. In addition, the operation of the second alkali liquid pump 52 can also increase the flow rate of the alkali liquid circulation, improve the heat exchange efficiency, ensure that the electrolyzer 10 operates at an optimal temperature, and then optimize the output and quality of hydrogen produced by electrolysis.

[0036] like Figure 1 As shown, the gas-liquid separator includes a hydrogen separator 21 and an oxygen separator 22, and the gas-liquid pipeline includes a first gas-liquid pipeline 71 and a second gas-liquid pipeline 72. The first gas-liquid pipeline 71 connects the electrolyzer 10 with the hydrogen separator 21, and the second gas-liquid pipeline 72 connects the electrolyzer 10 with the oxygen separator 22. The hydrogen separator 21 has a first outlet connected to the alkali liquid outlet, and the oxygen separator 22 has a second outlet connected to the alkali liquid outlet. The hydrogen separator 21 and the oxygen separator 22 are connected to the electrolyzer 10 through the first gas-liquid pipeline 71 and the second gas-liquid pipeline 72, respectively, which can realize the efficient separation of hydrogen and alkali liquid, and the efficient separation of oxygen and alkali liquid, reduce the impurity content in the electrolysis product, and improve the purity of hydrogen and oxygen. Through precise separation, the safety of subsequent storage and transportation of hydrogen and oxygen is guaranteed, and at the same time, a higher quality guarantee is provided for the use of hydrogen as energy.

[0037] like Figure 1 As shown, the electrolytic water hydrogen production system also includes a three-way valve 54 connected to the alkali solution outlet, and the three-way valve 54 has a cooling position connecting the alkali solution outlet and the first pipeline 61 and a heat preservation position connecting the alkali solution outlet and the second pipeline 62. The three-way valve 54 is connected to the alkali solution outlet, providing a switch between the cooling position and the heat preservation position, and can quickly and accurately control the flow direction of the alkali solution when the operating state of the electrolytic water hydrogen production system changes, such as when it changes from a normal working state to a pause state, and realizes the selective input of the alkali solution between the insulation box or the cooler, thereby ensuring the rapid adaptability and high efficiency of the system under different operating modes. The introduction of the three-way valve 54 greatly improves the flexibility and operating efficiency of the system.

[0038] like Figure 1 As shown, the electrolytic water hydrogen production system also includes a first control member connected to the three-way valve 54, and the first control member controls the switching of the three-way valve 54 between the cooling position and the heat preservation position. The first control member is connected to the three-way valve 54, and can automatically control the flow of the alkali solution. According to the needs of the working state of the electrolytic water hydrogen production system, the optimal flow path of the alkali solution is automatically selected, that is, whether the alkali solution is cooled through the first cooler 31 or directly enters the alkali solution insulation box 40 for heat preservation. The automatic control of the first control member reduces the complexity of manual operation, improves the reliability of the system, and also reduces the risk of operating errors.

[0039] like Figure 1 As shown, the water electrolysis hydrogen production system also includes a second cooler arranged on the second pipeline 62, and the second cooler is located downstream of the alkali solution insulation box 40. The second cooler is arranged downstream of the alkali solution insulation box 40, and the alkali solution after insulation can be cooled for a second time when the system is restored from the pause state to the running state, so as to ensure that the alkali solution reaches the optimal working temperature before re-entering the electrolyzer 10, and avoid the adverse effect on the performance of the electrolyzer 10 due to the excessively high alkali solution temperature. In addition, the setting of the second cooler can also provide the system with a more sophisticated temperature control capability, and enhance the stability and hydrogen production efficiency of the water electrolysis hydrogen production system.

[0040] like Figure 1 As shown, the water electrolysis hydrogen production system also includes a heater arranged in the alkali solution insulation box 40. The heater is arranged in the alkali solution insulation box 40, and when the alkali solution temperature drops below the temperature required for water electrolysis hydrogen production after the system is suspended for a long time, the heater can be used to quickly restore the alkali solution to a suitable temperature, thereby ensuring that the system can quickly reach a hot standby state when restarting, reducing the startup time and saving energy consumption. The setting of the heater ensures that the system can respond quickly in any temperature environment and enhances the environmental adaptability of the system.

[0041] like Figure 1As shown, the electrolysis water hydrogen production system also includes a second control member and a temperature sensor connected to the second control member signal. The temperature sensor is arranged in the alkali liquid insulation box 40, and the second control member is connected to the second cooler and the heater control. The temperature sensor detects the temperature in the alkali liquid insulation box 40 to transmit the temperature signal to the second control member, and the second control member controls the opening and closing of the second cooler and the heater. The second control member is connected to the temperature sensor signal, and the temperature sensor is arranged in the alkali liquid insulation box 40, and the alkali liquid temperature in the alkali liquid insulation box 40 can be monitored and intelligently controlled in real time. The temperature sensor can accurately detect the temperature change in the alkali liquid insulation box 40, and transmit the temperature signal to the second control member in time. The second control member automatically adjusts the opening and closing of the heater and the second cooler according to the received temperature signal to maintain the temperature in the alkali liquid insulation box 40 within a set range. This intelligent control based on real-time data not only ensures the temperature management of the alkali liquid, but also further optimizes the energy utilization of the system, reduces unnecessary energy consumption, reduces operating costs, and improves the economic benefits and environmental friendliness of the entire system.

[0042] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water electrolysis hydrogen production system, characterized in that: include: An electrolytic cell (10) having a gas and liquid outlet; A gas-liquid separator, the gas-liquid separator is connected to the gas-liquid outlet via a gas-liquid pipeline, and the gas-liquid separator has an alkaline liquid outlet; A first cooler (31), the alkali solution outlet is connected to the electrolytic cell (10) through a first pipeline (61), and the first cooler (31) is arranged on the first pipeline (61); an alkali solution heat preservation box (40), the alkali solution outlet being in communication with the electrolytic cell (10) via a second pipeline (62), and the alkali solution heat preservation box (40) being arranged on the second pipeline (62); Wherein, the alkali solution outlet can be selectively connected to the electrolytic cell (10) through the first pipeline (61) or the second pipeline (62).

2. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system further comprises a first alkali solution pump (51) arranged on the second pipeline (62), and the first alkali solution pump (51) is located downstream of the alkali solution insulation box (40).

3. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system further comprises a filter (53) arranged on the first pipeline (61), and the filter (53) is located downstream of the cooler.

4. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system further comprises a second alkali liquid pump (52) arranged on the first pipeline (61), and the second alkali liquid pump (52) is located downstream of the first cooler (31).

5. The water electrolysis hydrogen production system according to claim 1, characterized in that: The gas-liquid separator comprises a hydrogen separator (21) and an oxygen separator (22); the gas-liquid pipeline comprises a first gas-liquid pipeline (71) and a second gas-liquid pipeline (72); the first gas-liquid pipeline (71) connects the electrolyzer (10) and the hydrogen separator (21); and the second gas-liquid pipeline (72) connects the electrolyzer (10) and the oxygen separator (22); The hydrogen separator (21) has a first outlet communicated with the alkali solution outlet, and the oxygen separator (22) has a second outlet communicated with the alkali solution outlet.

6. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system also includes a three-way valve (54) connected to the alkali solution outlet, and the three-way valve (54) has a cooling position connecting the alkali solution outlet and the first pipeline (61) and a heat preservation position connecting the alkali solution outlet and the second pipeline (62).

7. The water electrolysis hydrogen production system according to claim 6, characterized in that: The water electrolysis hydrogen production system further comprises a first control component which is controllably connected to the three-way valve (54), and the first control component controls the switching of the three-way valve (54) between the temperature reduction position and the temperature preservation position.

8. The water electrolysis hydrogen production system according to claim 1, characterized in that: The water electrolysis hydrogen production system further comprises a second cooler arranged on the second pipeline (62), and the second cooler is located downstream of the alkali solution insulation box (40).

9. The water electrolysis hydrogen production system according to claim 8, characterized in that: The water electrolysis hydrogen production system also includes a heater arranged in the alkali solution insulation box (40).

10. The water electrolysis hydrogen production system according to claim 9, characterized in that: The water electrolysis hydrogen production system also includes a second control component and a temperature sensor connected to the second control component by signal, the temperature sensor is arranged in the alkali solution insulation box (40), and the second control component is control-connected to the second cooler and the heater; the temperature sensor detects the temperature in the alkali solution insulation box (40) to transmit the temperature signal to the second control component, and the second control component controls the opening and closing of the second cooler and the heater.

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