Flow type electrolysis supercritical water hydrogen production system and method

Abstract

The invention discloses a flowing type electrolysis supercritical water hydrogen production system and method. The system comprises a supercritical water generator, an electrolysis supercritical water reactor, a first after-reaction supercritical water storage tank, a second after-reaction supercritical water storage tank, a pressure monitoring device and a temperature monitoring device. Wherein the pressure monitoring device and the temperature monitoring device are arranged inside the electrolysis supercritical water reactor, and an outlet of the electrolysis supercritical water reactor is divided into two paths which are respectively connected with the first after-reaction supercritical water storage tank and the second after-reaction supercritical water storage tank. The electrolysis supercritical water generator is arranged, supercritical water is dissociated through an electrochemical means, and the supercritical water is converted into hydrogen and oxygen. The mode of electrolyzing the supercritical water can be carried out at higher temperature and pressure, and the method has remarkable advantages in the aspects of thermodynamics and dynamics. In addition, hydrogen generated in the supercritical water can be mutually dissolved with the supercritical water in any proportion instead of being separated out in the form of bubbles, and stable operation of the electrolysis process is facilitated. Under the conventional implementation working condition, the actual electric energy demand of hydrogen preparation is remarkably lower than that of conventional alkaline electrolyzed water, proton exchange membrane electrolyzed water and other technologies, high-pressure hydrogen matched with the downstream pressure demand of the hydrogen energy industry can be prepared in one step, the prepared hydrogen does not need to be pressurized again, and the energy consumption and the cost are further reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen production, and relates to a flow-type electrolytic supercritical water hydrogen production system and method. Background Art

[0002] Hydrogen energy is a clean, green and efficient secondary energy source. In recent years, with the increasing global demand for energy conservation and emission reduction, hydrogen energy technology has developed rapidly. Although hydrogen energy has rich reserves, most of them exist in the form of compounds. As the energy carrier of hydrogen energy, hydrogen needs to be produced by physical and chemical methods before formal utilization. At present, hydrogen production mainly includes fossil fuel reforming, pyrolysis and electrolysis of water, etc. Among them, electrolysis of water for hydrogen production has received extensive attention due to its simple process and zero carbon emissions. Using renewable energy for electrolysis can directly decompose water molecules to generate high-purity hydrogen and oxygen. However, the traditional electrolysis of water for hydrogen production technology has low efficiency and high energy consumption, and has limitations in commercial applications. Supercritical water (SCW), as a special reaction medium, has physical and chemical properties different from those of conventional water. On the basis of increasing the degree of water ionization, its reaction activity is significantly improved. In the field of hydrogen production, using supercritical water for electrolysis reaction has potential technical advantages.

[0003] Currently, the most commercially mature alkaline water electrolysis for hydrogen production (AWE) technology has a low working current density, limited efficiency, and requires a large floor area, increasing the complexity of the system. Although proton exchange membrane electrolysis of water (PEM) has a high current density, it is limited by noble metal catalysts, and the problem of short membrane life has not been solved, hindering its large-scale application. Solid oxide electrolysis of water (SOEC) has a high electrolysis efficiency, but the equipment has poor stability and durability at high temperatures, and the thermal management and integration of the system are difficult, restricting commercial development.

[0004] Supercritical water electrolysis is carried out under high-temperature and high-pressure operating conditions, and the supercritical water electrolysis system faces the problems of insufficient heat energy management and recovery and serious energy loss. Summary of the Invention

[0005] To overcome the problems of low electrolysis efficiency and serious energy loss existing in the prior art, the purpose of the present invention is to provide a flow-type electrolytic supercritical water hydrogen production system and method, and the system has the advantages of high electrolysis efficiency and simple structure.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A flow-type electrolytic supercritical water hydrogen production system, comprising a supercritical water generator, an electrolytic supercritical water reactor, an electrolytic power supply device, a first post-reaction supercritical water storage tank, a second post-reaction supercritical water storage tank, a pressure monitoring device and a temperature monitoring device; wherein, the electrolytic power supply device is electrically connected to the electrolytic supercritical water reactor, the pressure monitoring device and the temperature monitoring device are arranged inside the electrolytic supercritical water reactor, and the outlet of the electrolytic supercritical water reactor is divided into two paths, respectively connected to the first post-reaction supercritical water storage tank and the second post-reaction supercritical water storage tank.

[0008] Further, a booster pump and a first solenoid valve are provided between the pure water tank and the supercritical water generator.

[0009] Further, a second solenoid valve is provided between the top outlet of the supercritical water generator and the electrolytic supercritical water reactor.

[0010] Further, the supercritical water generator is provided with a water inlet and a water outlet, the water inlet is connected to the first solenoid valve, and the water outlet is connected to the second solenoid valve.

[0011] Further, the electrolytic supercritical water reactor is provided with a feed inlet and two discharge outlets, the feed inlet is connected to the second solenoid valve, one discharge outlet is connected to the first post-reaction supercritical water storage tank, and the other discharge outlet is connected to the second post-reaction supercritical water storage tank.

[0012] Further, a first heating device is provided at the bottom of the supercritical water generator; a second heating device is provided at the bottom of the electrolytic supercritical water reactor.

[0013] Further, it further includes a pure water tank connected to the supercritical water generator, the pure water tank is provided with a water inlet and a water outlet, the water inlet is connected to the raw material inlet pipe, and the water outlet is connected to the inlet end of the booster pump.

[0014] Further, a third solenoid valve is connected to the first supercritical water outlet, and a fourth solenoid valve is connected to the first supercritical water outlet.

[0015] Further, the electrolytic supercritical water reactor includes a housing, a supercritical water inlet, a first electrode, a second electrode, a first supercritical water outlet, a second supercritical water outlet and a product separator; wherein, a supercritical water inlet is provided at one end of the housing, a first electrode is provided in the upper part of the housing, a second electrode is provided at the bottom, a product separator is provided inside the other end of the housing, a first supercritical water outlet is provided on one side of the housing and the product separator, and a second supercritical water outlet is provided on the other side; the electrolytic power supply device is connected to the first electrode and the second electrode through wires to form a closed loop, a third solenoid valve is connected to the first supercritical water outlet, and a fourth solenoid valve is connected to the first supercritical water outlet.

[0016] A method for producing hydrogen and oxygen by electrolyzing supercritical water, comprising the following steps:

[0017] An electrolyte is added to liquid water and then pumped into a supercritical water generator. The liquid water is heated and pressurized to the rated supercritical state, and then the supercritical water is fed into an electrolytic supercritical water reactor. The electrolytic power supply device is connected to the first electrode and the second electrode through wires to form a closed circuit. Electrochemical reactions occur at the first electrode and the second electrode to produce hydrogen and oxygen respectively.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In the present invention, by setting up an electrolytic supercritical water generator, supercritical water is dissociated by electrochemical means and converted into hydrogen and oxygen. Compared with the original proton exchange membrane water electrolysis technology and alkaline water electrolysis methods, the method of electrolyzing supercritical water can be carried out at higher temperatures and pressures (>374 °C; >22.1 Mpa), and it has significant advantages in terms of thermodynamics and kinetics. Moreover, the hydrogen produced in supercritical water can be miscible with supercritical water in any proportion instead of precipitating in the form of bubbles, which helps the stable operation of the electrolysis process. Under the conventional operating conditions (400 °C) of the present invention, the actual electrical energy required for hydrogen production is about 0.099 kWh / mol. Conventional water electrolysis technologies are usually carried out at lower temperatures. At 90 °C, the actual electrical energy required for hydrogen production is about 0.1134 kWh / mol. When the present invention is under conventional operating conditions, the actual electrical energy required for hydrogen production is significantly lower than that of conventional alkaline water electrolysis and proton exchange membrane water electrolysis technologies, and high-pressure hydrogen that matches the pressure demand of the downstream of the hydrogen energy industry can be obtained in one step without re-pressurizing the produced hydrogen, further reducing energy consumption and costs. Also, the hydrogen produced in supercritical water can be miscible with supercritical water in any proportion instead of precipitating in the form of bubbles, which helps the stable operation of the electrolysis process. Therefore, the hydrogen and oxygen prepared by this system have the same temperature and pressure as supercritical water. Subsequently, only a steam-water separator is needed to separate hydrogen and oxygen from it, and high-pressure hydrogen and oxygen can be directly obtained without re-pressurizing hydrogen and oxygen again, thereby reducing the energy consumption required for compressing the subsequent product gas. Under industrial conditions, the energy required to compress hydrogen from 1 atm to 20 MPa is usually 0.0336 - 0.0897 kWh / mol, while the typical energy consumption for preparing supercritical water is about -0.01 kWh / mol. The energy consumption required to pressurize liquid water to the supercritical state in the present invention is much less than that for pressurizing hydrogen. Thus, it can be seen that the pressurized electrolysis method proposed by the present invention has significant advantages in terms of energy consumption compared with the prior art.

[0020] The supercritical water in the present invention has a high mass transfer rate. The ion diffusion rate in liquid water is about 10 - 9 m 2 / s, and the ion diffusion rate in supercritical water is about 10 -7 m 2 / s. Compared with the original conventional electrolyzed water technology, a lower resistivity can be obtained after adding the same amount of electrolyte, which can meet the development of the membrane-free electrolysis system and further reduce the development cost of the electrolysis system. In the present invention, hydrogen and oxygen in supercritical water can achieve mild conversion and heat release. Compared with the existing electrolysis technology, this system has a higher tolerance for hydrogen-oxygen mixing and higher safety. The gas products generated by the electrochemical process in the present invention can be dissolved in supercritical water in any proportion, which can solve problems such as electrolyte fluctuations and unstable electrolysis conditions caused by the appearance of a large number of bubbles in traditional technologies. At the same time, it can also avoid the reduction of the effective reaction surface of the electrode caused by the bubble covering the electrode surface and promote the kinetic process of water decomposition. Due to the high solubility of supercritical water in non-polar substances and the relatively high reaction rate under high-temperature conditions, the present invention can also realize the co-electrolysis of gases such as carbon dioxide and nitrogen with supercritical water. Supercritical water also has good solubility in organic material substances such as agricultural and forestry biomass, plastics, and kitchen waste. At the same time, the supercritical water environment can promote the electrochemical kinetic process. Therefore, this invention can also achieve the one-step dissolution and decomposition of organic material substances such as agricultural and forestry biomass, plastics, and kitchen waste through electrochemical conversion. Description of the Drawings

[0021] Figure 1 It is a structural diagram of the electrolytic supercritical water hydrogen production system involved in the present invention;

[0022] Figure 2 It is a schematic structural diagram of the electrolytic supercritical water reactor;

[0023] Among them, 101 is a pure water tank, 102 is a booster pump, 103 is a first solenoid valve, 105 is a first heating device, 106 is a supercritical water generator, 107 is a second solenoid valve, 108 is a second heating device, 109 is an electrolytic supercritical water reactor, 110 is an electrolytic power supply device, 111 is a third solenoid valve, 112 is a fourth solenoid valve, 113 is a first supercritical water storage tank, 114 is a second supercritical water storage tank, 115 is a pressure monitoring device, 116 is a temperature monitoring device, 1091 is a supercritical water inlet, 1092 is a first electrode, 1093 is a second electrode, 1094 is a first supercritical water outlet, 1095 is a second supercritical water outlet, and 1096 is a product separator. Detailed Embodiments

[0024] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0025] In addition, an element in the present invention is referred to as "fixed to" or "disposed on" another element, and it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0026] In a typical embodiment of the present application, please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of a preferred embodiment of the supercritical water electrolysis hydrogen production system provided by the present invention; a flow-through electrolytic supercritical water hydrogen production system, including a pure water tank 101, a booster pump 102, a first solenoid valve 103, a supercritical water generator 106, a second solenoid valve 107, an electrolytic supercritical water reactor 109, an electrolytic power supply device 110, a third solenoid valve 111, a fourth solenoid valve 112, a first post-reaction supercritical water storage tank 113, a second post-reaction supercritical water storage tank 114, a pressure monitoring device 115 and a temperature monitoring device 116.

[0027] Among them, the pure water tank 101 is connected to the supercritical water generator 106 through the booster pump 102 and the first solenoid valve 103. A heating device 105 is provided at the bottom of the supercritical water generator 106. The top outlet of the supercritical water generator 106 is connected to the electrolytic supercritical water reactor 109 through the second solenoid valve 107. A second heating device 108 is provided at the bottom of the electrolytic supercritical water reactor 109. An outlet is provided at the top of the electrolytic supercritical water reactor 109, and the outlet is divided into two paths, one path is connected to the first post-reaction supercritical water storage tank 113, and the other path is connected to the second post-reaction supercritical water storage tank 114. The electrolytic supercritical water reactor 109 is connected to the electrolytic power supply device 110.

[0028] The pure water tank 101 is used to store raw water. The pressure of the raw water is increased by the booster pump 102 and pumped into the supercritical water generator 106 through the first solenoid valve 103. The heat of the supercritical water generator 106 is provided by the first heating device 105. The supercritical water generated in the supercritical water generator 106 is pumped into the electrolytic supercritical water reactor 109 through the second solenoid valve 107. The electrolytic power supply device 110 is electrically connected to the electrolytic supercritical water reactor 109; the pressure monitoring device 115 is arranged inside the electrolytic supercritical water reactor 109 for monitoring the internal pressure of the electrolytic supercritical water reactor 109; the temperature monitoring device 116 is arranged inside the electrolytic supercritical water reactor 109 for monitoring the internal temperature of the electrolytic supercritical water reactor 109.

[0029] It should be noted that in this embodiment, an inlet and an outlet are provided inside the pure water tank 101. The inlet of the pure water tank is connected to the raw material inlet pipe, and the outlet of the pure water tank is connected to the inlet end of the booster pump 102.

[0030] The supercritical water generator 106 is provided with an inlet and an outlet. The inlet is connected to the first solenoid valve 103, and the outlet is connected to the second solenoid valve 107.

[0031] The electrolytic supercritical water reactor 109 is provided with one feed inlet and two discharge outlets. The feed inlet is connected to the second solenoid valve 107. One discharge outlet is connected to the first post-reaction supercritical water storage tank 113, and the other discharge outlet is connected to the second post-reaction supercritical water storage tank 114.

[0032] The electrolytic power supply device 110 is used to provide electric energy. An electric current is passed into the electrolytic supercritical water reactor 109 through a wire, and electrodes are arranged in the electrolytic supercritical water reactor 109 to realize the electrolysis of water reaction.

[0033] The first supercritical water storage tank 113 and the second supercritical water storage tank 114 are used to store the electrolytic products released from the discharge outlets of the electrolytic supercritical water reactor 109. A feed inlet and a discharging device are respectively provided.

[0034] See Figure 2 , the electrolytic supercritical water reactor 109 includes a housing, a supercritical water inlet 1091, a first electrode 1092, a second electrode 1093, a first supercritical water outlet 1094, a second supercritical water outlet 1095 and a product separator 1096; wherein, a supercritical water inlet 1091 is provided at one end of the housing, a first electrode 1092 is provided in the upper part of the housing, a second electrode 1093 is provided at the bottom, a product separator 1096 is provided inside the other end of the housing, a first supercritical water outlet 1094 is provided on one side of the housing and the product separator 1096, and a second supercritical water outlet 1095 is provided on the other side. The electrolytic power supply device 110 is connected to the first electrode 1092 and the second electrode 1093 through a wire to form a closed loop. The third solenoid valve 111 is connected to the first supercritical water outlet 1094. The fourth solenoid valve 112 is connected to the first supercritical water outlet 1095.

[0035] A method for producing hydrogen and oxygen by electrolyzing supercritical water according to the present invention includes the following steps:

[0036] 1) Supplementary liquid water is added to the pure water tank 101.

[0037] 2) Electrolytes such as sodium hydroxide and sodium chloride are added to the liquid water to enhance conductivity. Gas raw materials such as carbon dioxide can be added for co-electrolysis with supercritical water. Organic substances containing hydrocarbons such as agricultural and forestry biomass and plastics can also be added into the water tank and mixed with the liquid water to form a dilute slurry.

[0038] 3) Turn on the booster pump 102 and the first solenoid valve 103, and turn off the second solenoid valve 107. After pumping an appropriate amount of liquid water (slurry) into the supercritical water generator 106, heat and pressurize the liquid water to the rated supercritical state.

[0039] 4) The second solenoid valve 107 is controlled by the pressure of the supercritical water generator 106. When the supercritical water reaches the rated pressure, turn on the second solenoid valve 107 and send the supercritical water into the electrolytic supercritical water reactor 109. The electrolysis power supply device 110 operates continuously. After the supercritical water is pumped into the electrolytic supercritical water reactor 109, the electrolysis power supply device 110, the first electrode 1092, and the second electrode 1093 are connected by wires to form a closed circuit. Electrochemical reactions occur on the first electrode 1092 and the second electrode 1093 to produce hydrogen and oxygen respectively. Hydrogen, oxygen, and other gas products are completely dissolved in the supercritical water and flow forward. Under the action of concentration diffusion, the downstream product plume continues to thicken. The product separator 1096 arranged downstream naturally separates the supercritical water containing different gas products and flows to the first supercritical water outlet 1094 and the second supercritical water outlet 1095.

[0040] 5) The third solenoid valve 111 is connected to the first supercritical water outlet 1094 and is controlled by the pressure of the electrolytic supercritical water reactor 109. The fourth solenoid valve 112 is connected to the first supercritical water outlet 1095 and is controlled by the pressure of the electrolytic supercritical water reactor 109. After the rated working condition is reached in the electrolytic supercritical water reactor 109, open the third solenoid valve 111 and the fourth solenoid valve 112. Drain the supercritical water containing hydrogen to the supercritical water storage tank 113, and drain the supercritical water containing oxygen to the supercritical water storage tank 114. When adding gas substances such as carbon dioxide or realizing co-electrolysis of organic substances containing hydrocarbons, the components in the products are not only hydrogen and oxygen. However, natural shunt treatment of different electrode products can still be achieved through this system.

[0041] 6) Cool down in the supercritical water storage tank 113 and the supercritical water storage tank 114 to convert the supercritical water into conventional liquid water. The hydrogen and oxygen in the liquid water are precipitated in the form of gas and stored.

[0042] Existing conventional electrolyzed water technologies are usually implemented at relatively low temperatures. At 90 °C, the actual electrical energy requirement for hydrogen production is approximately 0.1134 kWh / mol. While under the conventional operating conditions (400 °C) of the present invention, the actual electrical energy requirement for hydrogen production is approximately 0.099 kWh / mol. Moreover, the hydrogen and oxygen generated in supercritical water can be miscible with supercritical water in any proportion. Therefore, the hydrogen and oxygen prepared via this system have the same temperature and pressure as supercritical water. Subsequently, only a steam-water separator is needed to separate the hydrogen and oxygen therefrom, and high-pressure hydrogen and oxygen can be directly obtained without the need to pressurize the hydrogen and oxygen again, thereby reducing the energy consumption required for subsequent compression of the product gas. Under industrial conditions, the energy required to compress hydrogen from 1 atm to 20 MPa is usually 0.0336 - 0.0897 kWh / mol, while the typical energy consumption for preparing supercritical water is approximately -0.01 kWh / mol. It can be seen that the energy consumption required to pressurize liquid water to the supercritical state is much less than that for pressurizing hydrogen. Thus, it can be seen that the pressurized electrolysis method proposed in the present invention has significant advantages in terms of energy consumption compared with the prior art.

[0043] The supercritical water in the present invention has a high mass transfer rate. The ion diffusion rate in liquid water is approximately 10 - 9 m 2 / s, and the ion diffusion rate in supercritical water is approximately 10 -7 m 2 / s. Compared with the original conventional electrolyzed water technology, a lower resistivity can be obtained after adding an equal amount of electrolyte, which can meet the development of a membrane-free electrolysis system and further reduce the development cost of the electrolysis system.

[0044] In the present invention, the hydrogen and oxygen in supercritical water can achieve mild conversion and heat release. Compared with the original electrolysis technology, this system has a higher tolerance for hydrogen-oxygen mixing and higher safety.

[0045] In addition, due to the high solubility of supercritical water for non-polar substances and the relatively high reaction rate under high-temperature conditions. The present invention can also achieve the co-electrolysis of gases such as carbon dioxide and nitrogen with supercritical water. Supercritical water also has good solubility for organic material substances such as agricultural and forestry biomass, plastics, and kitchen waste, and can promote the electrochemical kinetic process in a supercritical water environment. Therefore, this invention can also achieve the one-step dissolution and decomposition of organic material substances such as agricultural and forestry biomass, plastics, and kitchen waste through electrochemical conversion.

[0046] The above only describes the best embodiments of the present invention, but it should not be construed as a limitation on the claims. The present invention is not limited to the above embodiments, and its specific structure allows for variations. Any variations made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. A flow-type electrolytic supercritical water hydrogen production system, characterized in that, It includes a supercritical water generator (106), an electrolytic supercritical water reactor (109), an electrolytic power supply device (110), a first post-reaction supercritical water storage tank (113), a second post-reaction supercritical water storage tank (114), a pressure monitoring device (115) and a temperature monitoring device (116); wherein, the electrolytic power supply device (110) is electrically connected to the electrolytic supercritical water reactor (109), the pressure monitoring device (115) and the temperature monitoring device (116) are arranged inside the electrolytic supercritical water reactor (109), and the outlet of the electrolytic supercritical water reactor (109) is divided into two paths, which are respectively connected to the first post-reaction supercritical water storage tank (113) and the second post-reaction supercritical water storage tank (114).

2. The flow-type electrolytic supercritical water hydrogen production system according to claim 1, characterized in that A booster pump (102) and a first solenoid valve (103) are arranged between the pure water tank (101) and the supercritical water generator (106).

3. The flow-type electrolytic supercritical water hydrogen production system according to claim 2, characterized in that, A second solenoid valve (107) is arranged between the top outlet of the supercritical water generator (106) and the electrolytic supercritical water reactor (109).

4. The flow-type electrolytic supercritical water hydrogen production system according to claim 3, wherein The supercritical water generator (106) is provided with an inlet and an outlet. The inlet is connected to the first solenoid valve (103), and the outlet is connected to the second solenoid valve (107).

5. The flow-type electrolytic supercritical water hydrogen production system according to claim 3, wherein The electrolytic supercritical water reactor (109) is provided with one feed inlet and two discharge outlets. The feed inlet is connected to the second solenoid valve (107), one discharge outlet is connected to the first post-reaction supercritical water storage tank (113), and the other discharge outlet is connected to the second post-reaction supercritical water storage tank (114).

6. The flow-type electrolytic supercritical water hydrogen production system according to claim 1, wherein, A first heating device (105) is arranged at the bottom of the supercritical water generator (106); a second heating device (108) is arranged at the bottom of the electrolytic supercritical water reactor (109).

7. The flow-through electrolytic supercritical water hydrogen production system according to claim 1, characterized in that, It also includes a pure water tank (101) connected to the supercritical water generator (106). The pure water tank (101) is provided with an inlet and an outlet. The inlet is connected to the raw material inlet pipe, and the outlet is connected to the inlet end of the booster pump (102).

8. The flow-type electrolytic supercritical water hydrogen production system according to claim 1, wherein, The third solenoid valve (111) is connected to the first supercritical water outlet (1094), and the fourth solenoid valve (112) is connected to the first supercritical water outlet (1095).

9. The flow-type electrolytic supercritical water hydrogen production system according to claim 1, wherein The electrolytic supercritical water reactor (109) includes a housing, a supercritical water inlet (1091), a first electrode (1092), a second electrode (1093), a first supercritical water outlet (1094), a second supercritical water outlet (1095) and a product separator (1096); wherein, a supercritical water inlet (1091) is arranged at one end of the housing, the first electrode (1092) is arranged in the upper part of the housing, the second electrode (1093) is arranged at the bottom, the product separator (1096) is arranged inside the other end of the housing, the first supercritical water outlet (1094) is arranged on one side of the housing and the product separator (1096), and the second supercritical water outlet (1095) is arranged on the other side; the electrolytic power supply device (110) is connected to the first electrode (1092) and the second electrode (1093) through wires to form a closed loop. The third solenoid valve (111) is connected to the first supercritical water outlet (1094), and the fourth solenoid valve (112) is connected to the first supercritical water outlet (1095).

10. A method for producing hydrogen and oxygen by supercritical water electrolysis based on the system according to claim 9, characterized in that, The method includes the following steps: Adding an electrolyte or / and an organic substance to liquid water, then pumping it into a supercritical water generator (106), heating and pressurizing the liquid water to the rated supercritical state, and then feeding the supercritical water into an electrolytic supercritical water reactor (109). The electrolysis power supply device (110) and the first electrode (1092) and the second electrode (1093) are connected by wires to form a closed loop, and the first electrode (1092) and the second electrode (1093) undergo an electrochemical reaction to generate hydrogen and oxygen respectively.

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