Water electrolysis hydrogen production system

Abstract

The invention relates to a water electrolysis hydrogen production system, and relates to the technical field of water electrolysis hydrogen production, the water electrolysis hydrogen production system comprises an electrolytic bath, the anode side of the electrolytic bath is communicated with a vacuum assembly, the vacuum assembly enables the anode side of the electrolytic bath to form negative pressure, and one side of the vacuum assembly is provided with an oxygen separation assembly; and one side, deviating from the vacuum assembly, of the oxygen separation assembly is relatively communicated with the cathode side of the electrolytic cell, and water is supplemented to the cathode side of the electrolytic cell. The method has the effect of reducing the influence of bubbles on the electrolysis process.

Description

Technical Field

[0001] The present application relates to the field of hydrogen production by electrolyzing water, and in particular to a hydrogen production system by electrolyzing water. Background Art

[0002] Hydrogen energy is a green and efficient energy source and has received extensive attention from all walks of life. Among them, the production of green hydrogen is a current research hotspot. Currently, the green hydrogen production routes with industrialization prospects include alkaline water electrolysis (ALK), proton exchange membrane (PEM) water electrolysis, anion exchange membrane (AEM) water electrolysis, and solid oxide (SOEC) water electrolysis. PEM water electrolysis can operate at a higher current density, has excellent dynamic performance with high load flexibility, and high hydrogen purity, suitable for high-pressure operation, showing unique advantages over other water electrolysis technologies.

[0003] In proton exchange membrane PEM water electrolysis, hydrogen is generated from the cathode through the HER reaction, and oxygen escapes from the anode through the OER reaction. Among them, HER is a two-electron transfer reaction, while OER is a four-electron-proton coupled reaction with a larger overpotential. Therefore, how to reduce the anodic overpotential is the research focus of PEM electrolyzers.

[0004] In a PEM electrolyzer, water is usually introduced on the anode side as a reactant. Therefore, for the anode of PEMWE, oxygen is generated and removed in the form of bubbles. Since the bubbles occupy the active potential of the electrode reaction, the bubbles have a great influence on the ohmic overpotential and concentration overpotential of the electrolysis process. Especially at high industrial current densities, how to reduce the influence of bubbles on the electrolysis process is the main challenge in electrocatalytic water decomposition.

[0005] At the same time, due to the high requirements of PEM electrolyzers for water quality, a dedicated high-purity water treatment device generally needs to be equipped, and the equipment investment cost is relatively high. A large amount of waste heat is generated during the electrolysis process of PEM water electrolysis and is usually treated as waste heat, resulting in energy waste. Summary of the Invention

[0006] In order to reduce the influence of bubbles on the electrolysis process, the present application provides a hydrogen production system by electrolyzing water.

[0007] A hydrogen production system by electrolyzing water provided by the present application adopts the following technical solutions:

[0008] A hydrogen production system by electrolyzing water includes an electrolytic cell. A vacuum assembly is connected to the anode side of the electrolytic cell. The vacuum assembly forms a negative pressure on the anode side of the electrolytic cell. An oxygen separation assembly is arranged on one side of the vacuum assembly. The side of the oxygen separation assembly facing away from the vacuum assembly is relatively connected to the cathode side of the electrolytic cell to supply water to the cathode side of the electrolytic cell.

[0009] By adopting the above technical solution, a negative pressure is formed on the anode side of the electrolytic cell through the vacuum assembly, which is beneficial to the removal of oxygen. At the same time, the liquid water diffused to the anode can evaporate into water vapor under the negative pressure environment, avoiding the generation of anode bubbles. The gas-liquid mixture generated on the anode side of the electrolytic cell is separated by the oxygen separation assembly, so that the separated liquid is recycled into the cathode side of the electrolytic cell to provide pure liquid for the cathode side of the electrolytic cell.

[0010] Optionally, the vacuum assembly includes a vacuum pump. The inlet of the vacuum pump is relatively communicated with the anode side of the electrolytic cell, and the outlet of the vacuum pump is relatively communicated with the oxygen separation assembly.

[0011] By adopting the above technical solution, the anode side of the electrolytic cell is evacuated by the vacuum pump, so that a negative pressure is formed on the anode side of the electrolytic cell, which is beneficial to the removal of oxygen, and the gas-liquid mixture located on the anode side of the electrolytic cell is introduced into the oxygen separation assembly for separation.

[0012] Optionally, the oxygen separation assembly includes an oxygen gas-liquid separation tank. The inlet of the oxygen gas-liquid separation tank is relatively communicated with the outlet of the vacuum pump.

[0013] By adopting the above technical solution, the gas-liquid mixture is introduced into the oxygen gas-liquid separation tank by the vacuum pump, and the gas-liquid mixture located inside the oxygen gas-liquid separation tank is separated, which is convenient for separating different components.

[0014] Optionally, an air outlet pipe is fixedly connected to the side wall of the oxygen gas-liquid separation tank, and a drain pipe is also fixedly connected to the side wall of the oxygen gas-liquid separation tank. The air outlet pipe communicates the inside of the oxygen gas-liquid separation tank with the outside, and the drain pipe communicates the inside of the oxygen gas-liquid separation tank with the outside.

[0015] By adopting the above technical solution, the gas-liquid mixture located inside the oxygen gas-liquid separation tank is separated, so that the separated gas is discharged from the inside of the air outlet pipe, and the separated liquid is discharged from the inside of the drain pipe, and then the different components are subjected to corresponding subsequent treatments.

[0016] Optionally, the air outlet pipe is located on the top wall of the oxygen gas-liquid separation tank, and the drain pipe is located on the bottom wall of the oxygen gas-liquid separation tank.

[0017] By adopting the above technical solution, by arranging the air outlet pipe at the top of the oxygen gas-liquid separation tank, the oxygen gas can be quickly discharged after being separated from the inside of the liquid, and when the liquid inside the oxygen gas-liquid separation tank increases, the gas and liquid can be quickly discharged; by placing the water outlet pipe on the bottom wall of the oxygen gas-liquid separation tank, the liquid inside the oxygen gas-liquid separation tank can be discharged as completely as possible, reducing the volume of liquid inside the oxygen gas-liquid separation tank, and facilitating the rapid discharge of the liquid.

[0018] Optionally, the drain pipe of the oxygen gas-liquid separation tank is connected to a water storage tank, and the water storage tank is used to store the liquid separated by the oxygen gas-liquid separation tank.

[0019] By adopting the above technical solution, the distilled water separated from the oxygen gas-liquid separation tank can be stored in the water storage tank, so that the distilled water can be recycled.

[0020] Optionally, a cathode gas-liquid separation tank is connected to the cathode side of the electrolytic cell, and the cathode gas-liquid separation tank is relatively connected to the outlet of the cathode side of the electrolytic cell.

[0021] By adopting the above technical solution, the gas-liquid mixture generated from the cathode side of the electrolytic cell can be separated by the provided cathode gas-liquid separation tank, which facilitates subsequent operations.

[0022] Optionally, a water supply pipe is fixedly connected to the side wall of the cathode gas-liquid separation tank, and the water supply pipe is relatively connected to the interior of the cathode gas-liquid separation tank.

[0023] Optionally, one end of the water supply pipe facing away from the cathode gas-liquid separation tank is relatively connected to the water storage tank.

[0024] By adopting the above technical scheme, the water storage tank and the interior of the cathode gas-liquid separation tank are relatively connected through the set water supply pipe, and then the distilled water inside the water storage tank is transferred to the interior of the cathode gas-liquid separation tank, so that the distilled water inside the water storage tank is circulated.

[0025] Optionally, an exhaust pipe is fixedly connected to the side wall of the cathode gas-liquid separation tank, and the exhaust pipe is relatively connected to the interior of the cathode gas-liquid separation tank.

[0026] Optionally, a water replenishment pump is fixedly connected to the water replenishment pipe, and the water replenishment pump can pump the liquid inside the water storage tank into the cathode gas-liquid separation tank.

[0027] By adopting the above technical solution, the distilled water inside the water storage tank can be quickly pumped into the cathode gas-liquid separation tank through the provided water replenishment pump, thereby realizing the circulation of distilled water from the anode side of the electrolyzer - vacuum component - oxygen separation component - water storage tank - hydrogen separation component.

[0028] Optionally, a hydrogen gas circuit regulating valve is fixedly connected to the exhaust pipe, and the hydrogen gas circuit regulating valve can control the opening and closing of the exhaust pipe.

[0029] Optionally, the exhaust pipe is relatively connected to the top wall of the cathode gas-liquid separation tank.

[0030] By adopting the above technical solution, by setting the exhaust pipe at the top of the cathode gas-liquid separation tank, the cathode gas can be quickly discharged after being separated from the inside of the liquid, and when the liquid inside the cathode gas-liquid separation tank increases, the gas and liquid can be quickly discharged;

[0031] Optionally, an evaporator is connected to the anode side of the electrolytic cell, and a liquid outlet of the evaporator is relatively connected to the anode side of the electrolytic cell.

[0032] By adopting the above technical solution, the raw water can be transported to the anode side of the electrolytic cell through the set evaporator, and the evaporator evaporates the raw water into water vapor under the action of negative pressure, which enters the anode side of the electrolytic cell, maintains the humidity of the anode side, humidifies the electrolyte membrane and can participate in the anode electrolysis reaction.

[0033] Optionally, a coil is fixedly connected to the interior of the evaporator, and the coil heats the liquid inside the evaporator, and the heated liquid is input to the anode side of the electrolytic cell through a raw water pipe.

[0034] Optionally, the coil includes a water inlet section, the water inlet section is located inside the evaporator and is fixedly connected to a spiral section, the end of the spiral section away from the water inlet section is fixedly connected to a water outlet section, and the water inlet section, the spiral section and the water outlet section are relatively connected.

[0035] Optionally, the spiral section is located inside the evaporator, and the spiral section is arranged in a spiral structure.

[0036] By adopting the above technical solution, the spiral section with a spiral structure is arranged inside the evaporator, which can increase the contact area between the coil and the raw water inside the evaporator, thereby improving the heating effect of the raw water inside the evaporator.

[0037] Optionally, one end of the water outlet section facing away from the spiral section is relatively connected to the cathode side of the electrolytic cell.

[0038] By adopting the above technical solution, by relatively connecting the water outlet section with the electrolytic cell, the liquid from the outside is electrolyzed through the cathode side of the electrolytic cell, and at the same time, the liquid inside the coiled pipe is conveyed to the cathode side of the electrolytic cell, and then the liquid is electrolyzed through the cathode side of the electrolytic cell. The electrolyzed gas-liquid mixture enters the inside of the cathode gas-liquid separation tank for separation.

[0039] The separated gas is discharged, and the separated liquid is reheated through the coiled pipe to heat the liquid located inside the evaporator and then flows back to the position of the cathode side of the electrolytic cell for circulation.

[0040] Optionally, the water inlet section and the cathode gas-liquid separation tank are relatively connected through a circulation pipe, and the liquid inside the cathode gas-liquid separation tank enters the inside of the coiled pipe from the circulation pipe.

[0041] By adopting the above technical solution, by relatively connecting the water inlet section with the cathode gas-liquid separation tank through a circulation pipe, the liquid located inside the cathode gas-liquid separation tank can enter the inside of the coiled pipe from the circulation pipe. Then, after the liquid on the cathode side of the electrolytic cell diffuses through the electrolyte membrane to the anode side of the electrolytic cell for electrolysis, after the electrolyzed gas-liquid mixture is separated by the anode gas-liquid separation tank, the liquid flows into the inside of the water storage tank. The liquid located inside the water storage tank is pumped into the inside of the cathode gas-liquid separation tank by a makeup water pump, the distilled water located inside the cathode gas-liquid separation tank is pumped into the inside of the coiled pipe by a circulation pump, the coiled pipe heats the liquid inside the evaporator, and the coiled pipe returns the distilled water back to the cathode side of the electrolytic cell. The liquid is electrolyzed again through the cathode side of the electrolytic cell, and the electrolyzed gas-liquid mixture flows back into the inside of the cathode gas-liquid separation tank, so that the liquid located inside the cathode gas-liquid separation tank can circulate through the circulation pipe.

[0042] Optionally, a circulation pump is fixedly connected to the side wall of the circulation pipe, and the circulation pump can pump the liquid located inside the cathode gas-liquid separation tank into the inside of the coiled pipe.

[0043] In summary, the present application includes at least one of the following beneficial technical effects:

[0044] 1. By feeding from the cathode side of the electrolytic cell, the water diffuses to the anode through the electrolyte membrane, which can eliminate the bubbles on the anode side of the electrolytic cell and reduce the overpotential on the anode side of the electrolytic cell.

[0045] 2. A vacuum pump is provided on the anode side of the electrolytic cell. By using the vacuum pump to form a negative pressure state on the anode side of the electrolytic cell, it is beneficial to the removal of anode oxygen. At the same time, the liquid water diffused from the cathode to the anode can be evaporated into water vapor to further eliminate bubbles.

[0046] 3. An evaporation component is provided, and the evaporator is connected to the negative pressure pipeline, enabling the evaporator to recycle and utilize the low-temperature waste heat of electrolysis of the electrolytic cell. The water inlet section of the coil inside the evaporator is connected to the cathode gas-liquid separation tank through a circulation pipe, allowing the liquid inside the cathode gas-liquid separation tank to enter the inside of the coil through the circulation pipe. Then, after the liquid on the cathode side of the electrolytic cell diffuses to the anode side of the electrolytic cell through the electrolyte membrane for electrolysis, the electrolyzed gas-liquid mixture is separated by the anode gas-liquid separation tank, and the liquid flows into the inside of the water storage tank. The liquid inside the water storage tank is pumped into the inside of the cathode gas-liquid separation tank by a makeup water pump, and the distilled water inside the cathode gas-liquid separation tank is pumped into the inside of the coil by a circulation pump. The coil heats the liquid inside the evaporator, and the coil returns the distilled water back to the cathode side of the electrolytic cell, and the liquid is electrolyzed again through the cathode side of the electrolytic cell. The electrolyzed gas-liquid mixture flows back into the inside of the cathode gas-liquid separation tank, enabling the liquid inside the cathode gas-liquid separation tank to circulate through the circulation pipe.

[0047] 4. It has low requirements for raw material water quality. Pure distilled water can be prepared through low-temperature evaporation, and the distilled water after low-temperature evaporation can be recycled as raw material water through circulation. The raw material water inlet can meet the requirements of ordinary water quality, which can save the investment in pure water. Brief Description of the Drawings

[0048] Figure 1 It is a schematic diagram of the overall structure of a water electrolysis hydrogen production system in an embodiment of the present application.

[0049] Description of the reference numerals: 1. Electrolytic cell; 11. Anode side; 12. Cathode side; 2. Power supply; 3. Vacuum component; 31. Vacuum pump; 4. Oxygen separation component; 41. Oxygen gas pipeline; 42. Oxygen gas-liquid separation tank; 421. Gas outlet pipe; 422. Oxygen gas pipeline regulating valve; 423. Drain pipe; 424. Drain valve; 43. Oxygen cooler; 44. Water storage tank; 441. Makeup water pipe; 442. Makeup water pump; 5. Hydrogen separation component; 51. Cathode gas-liquid separation tank; 511. Exhaust pipe; 512. Hydrogen gas pipeline regulating valve; 6. Evaporation component; 61. Evaporator; 611. Water inlet pipe; 612. Raw water pipe; 62. Coil; 621. Water inlet section; 622. Spiral section; 623. Water outlet section; 63. Circulation pipe; 631. Circulation pump. Detailed Embodiments

[0050] In order to more clearly understand the above-mentioned objects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0051] In the following description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited by the specific embodiments disclosed below.

[0052] In a PEM electrolyzer, water is usually introduced as a reactant on the anode side 11. Therefore, for the PEMWE anode, oxygen is generated and removed in the form of bubbles. Since the bubbles occupy the electrode reaction active potential, the bubbles have a great influence on the ohmic overpotential and concentration overpotential of the electrolysis process. Especially at high industrial current densities, how to reduce the influence of bubbles on the electrolysis process is a major challenge in electrocatalytic water splitting.

[0053] At the same time, due to the high requirements for water quality in PEM electrolyzers, a dedicated high-purity water treatment device generally needs to be equipped, resulting in a relatively high equipment investment cost. A large amount of waste heat is generated during the electrolysis process of PEM electrolyzed water and is usually treated as waste heat, causing energy waste. In order to reduce the influence of bubbles on the electrolysis process, the present application provides an electrolytic water hydrogen production system.

[0054] The following will Figure 1 describe the present application in further detail.

[0055] The embodiments of the present application disclose an electrolytic water hydrogen production system. Referring to Figure 1 , an electrolytic water hydrogen production system includes an electrolyzer 1. A power supply 2 for supplying power to the electrolyzer 1 is arranged on one side of the electrolyzer 1. After connecting the anode and cathode of the electrolyzer 1 to the power supply 2, the electrolyzer 1 is in a working state. Pure water is introduced through the cathode side 12 of the electrolyzer 1, and the water diffuses through the electrolyte membrane to the anode side 11, and water is decomposed into oxygen at the anode electrode.

[0056] A vacuum assembly 3 is arranged on the anode side 11 of the electrolyzer 1. The vacuum assembly 3 can form a negative pressure on the anode side 11 of the electrolyzer 1, which is beneficial to the removal of oxygen. At the same time, the liquid water diffusing to the anode can evaporate to form water vapor in the negative pressure environment, avoiding the generation of anode bubbles. An oxygen separation assembly 4 is also arranged on one side of the vacuum assembly 3. The oxygen separation assembly 4 can separate the gas-liquid mixture pumped out by the vacuum pump 31, discharge the separated oxygen, and store and recycle the separated liquid. A hydrogen separation assembly 5 is arranged on the cathode side 12 of the electrolyzer 1. The hydrogen separation assembly 5 can separate the gas-liquid mixture generated at the cathode of the electrolyzer 1, discharge the separated hydrogen, and recycle the separated liquid. An evaporation assembly 6 is also arranged on one side of the electrolyzer 1. The evaporation assembly 6 can utilize the heat source generated by the hydrogen separation assembly 5 and use the waste heat generated by the electrolyzer 1 as a heat source to heat the raw water.

[0057] The vacuum assembly 3 includes a vacuum pump 31 , which is located on the anode side 11 of the electrolytic cell 1 , and the outlet of the anode side 11 of the electrolytic cell 1 is relatively connected to the inlet of the vacuum pump 31 , so that the gas-liquid mixture on the anode side 11 of the electrolytic cell 1 is pumped out through the vacuum pump 31 .

[0058] The oxygen separation component 4 includes an oxygen gas pipeline 41 disposed at the outlet end of the vacuum pump 31, the oxygen gas pipeline 41 is relatively connected to the outlet end of the vacuum pump 31, and the end of the oxygen gas pipeline 41 away from the vacuum pump 31 is fixedly connected to an oxygen gas-liquid separation tank 42, and the oxygen gas-liquid separation tank 42 is relatively connected to the oxygen gas pipeline 41, so that the vacuum pump 31 and the oxygen gas-liquid separation tank 42 are relatively connected, and the anode side 11 of the electrolytic cell 1 is formed with a negative pressure through the vacuum pump 31, which is conducive to the removal of anode bubbles. At the same time, the liquid water diffused to the anode can evaporate to form water vapor under a negative pressure environment, avoiding the generation of anode bubbles. The gas-liquid mixture located at the anode side 11 of the electrolytic cell 1 is pumped into the interior of the oxygen gas-liquid separation tank 42.

[0059] An oxygen cooler 43 is fixedly connected to the side wall of the oxygen gas pipeline 41, and the interior of the oxygen cooler 43 is relatively connected to the interior of the oxygen gas pipeline 41, so that the gas-liquid mixture on the anode side 11 of the electrolytic cell 1 is input into the interior of the oxygen cooler 43 through the vacuum pump 31, and the gas-liquid mixture is cooled by the oxygen cooler 43 and then input into the interior of the oxygen gas-liquid separation tank 42.

[0060] The side wall of the oxygen gas-liquid separation tank 42 is fixedly connected with an outlet pipe 421, which is vertically arranged, and the interior of the outlet pipe 421 is relatively connected with the interior of the oxygen gas-liquid separation tank 42, and the outlet pipe 421 is located on the top wall of the oxygen gas-liquid separation tank 42, so that the oxygen separated inside the oxygen gas-liquid separation tank 42 can be discharged from the position of the outlet pipe 421. The side wall of the outlet pipe 421 is fixedly connected with an oxygen gas circuit regulating valve 422, which can control the opening and closing of the outlet pipe 421, so that the operator can discharge the gas inside the oxygen gas-liquid separation tank 42 according to the separation situation.

[0061] A drain pipe 423 is vertically arranged on the bottom wall of the oxygen gas-liquid separation tank 42. The drain pipe 423 is relatively fixedly connected to the oxygen gas-liquid separation tank 42, and the drain pipe 423 is relatively communicated with the inside of the oxygen gas-liquid separation tank 42, so that the liquid inside the oxygen gas-liquid separation tank 42 is discharged from the position of the drain pipe 423. A drain valve 424 is fixedly connected to the side wall of the drain pipe 423, and the drain valve 424 can control the opening and closing of the inside of the drain pipe 423, so that the operator can discharge the liquid inside the oxygen gas-liquid separation tank 42 according to the separation situation.

[0062] One end of the drain pipe 423 away from the oxygen gas-liquid separation tank 42 is provided with a water storage tank 44. The water storage tank 44 is a hollow tank structure. The water storage tank 44 is used to store the condensed distilled water, and the liquid separated inside the oxygen gas-liquid separation tank 42 can enter the inside of the water storage tank 44 through the drain pipe 423 for storage.

[0063] The hydrogen separation assembly 5 includes a cathode gas-liquid separation tank 51 located on the cathode side 12 of the electrolytic cell 1. The cathode gas-liquid separation tank 51 is in relative communication with the cathode side 12 of the electrolytic cell 1, and the hydrogen gas produced on the cathode side 12 of the electrolytic cell 1 can enter the inside of the cathode gas-liquid separation tank 51 for separation.

[0064] A discharge pipe 511 is fixedly connected to the side wall of the cathode gas-liquid separation tank 51. The discharge pipe 511 is vertically arranged and is located on the top wall of the cathode gas-liquid separation tank 51. The inside of the discharge pipe 511 is in relative communication with the inside of the cathode gas-liquid separation tank 51, so that the gas separated inside the cathode gas-liquid separation tank 51 can be discharged from the position of the discharge pipe 511. A hydrogen gas path regulating valve 512 is fixedly connected to the side wall of the discharge pipe 511. The hydrogen gas path regulating valve 512 can control the opening and closing of the discharge pipe 511, so as to facilitate the operator to discharge the gas according to the separation situation inside the cathode gas-liquid separation tank 51.

[0065] A water replenishing pipe 441 is horizontally and fixedly connected to the side wall of the water storage tank 44. The inside of the water replenishing pipe 441 is in relative communication with the inside of the water storage tank 44, so that the liquid inside the water storage tank 44 can be discharged from the inside of the water replenishing pipe 441. The position where the water replenishing pipe 441 is relatively connected to the water storage tank 44 is at the bottom of the side wall of the water storage tank 44, so as to facilitate the complete discharge of the liquid inside the water storage tank 44. One end of the water replenishing pipe 441 away from the water storage tank 44 is fixedly connected to the side wall of the cathode gas-liquid separation tank 51, and the water replenishing pipe 441 is in relative communication with the inside of the cathode gas-liquid separation tank 51. A water replenishing pump 442 is fixedly connected to the side wall of the water replenishing pipe 441. The water replenishing pump 442 can pump the liquid inside the water storage tank 44 into the inside of the cathode gas-liquid separation tank 51, so as to circulate the separated liquid.

[0066] The evaporation assembly 6 includes an evaporator 61. A coil 62 is arranged inside the evaporator 61, and a circulation pipe 63 is fixedly connected to the side wall of the evaporator 61. One end of the circulation pipe 63 is in relative communication with the evaporator 61, and the other end of the circulation pipe 63 is in relative communication with the cathode gas-liquid separation tank 51, and the circulation pipe 63 is relatively fixedly connected to the cathode gas-liquid separation tank 51, so that the inside of the cathode gas-liquid separation tank 51 is in relative communication with the inside of the evaporator 61.

[0067] A circulation pump 631 is fixedly connected to the side wall of the circulation pipe 63. By means of the provided circulation pump 631, the liquid located inside the cathode gas-liquid separation tank 51 can be pumped into the inside of the evaporator 61. A water inlet pipe 611 is fixedly connected to the side wall of the evaporator 61. The water inlet pipe 611 can supply raw water to the inside of the evaporator 61. A raw water pipe 612 is fixedly connected to the side wall of the evaporator 61. One end of the raw water pipe 612 is in relative communication with the evaporator 61, and the other end of the raw water pipe 612 is in relative communication with the anode side 11 of the electrolytic cell 1. Thus, under the action of negative pressure by the evaporator 61, the raw water is evaporated into water vapor, enters the anode side 11 of the electrolytic cell 1, maintains the humidity of the anode side 11, humidifies the electrolyte membrane and can participate in the electrolysis reaction of the anode.

[0068] The coiled pipe 62 includes a water inlet section 621 at the bottom end. A spiral section 622 is fixedly connected above the water inlet section 621. The spiral section 622 is in relative communication with the water inlet section 621. A water outlet section 623 is fixedly connected above the spiral section 622. The water outlet section 623 is in relative communication with the spiral section 622. One end of the water inlet section 621 is in relative communication with the circulation pump 631, and the water inlet section 621 penetrates through the side wall of the outer shell of the evaporator 61 and extends into the inside of the evaporator 61. The spiral section 622 is located inside the outer shell of the evaporator 61. One end of the water outlet section 623 is relatively connected to the spiral section 622, and the water outlet section 623 penetrates through the outside of the evaporator 61 and extends to the outside of the evaporator 61 and is in relative communication with the cathode side 12 of the electrolytic cell 1. The distilled water located inside the water storage tank 44 and the cathode gas-liquid separation tank 51 passes through the cathode of the electrolytic cell 1 to generate hydrogen.

[0069] The liquid located inside the circulation pipe 63 enters the inside of the coiled pipe 62 through the circulation pump 631, heats the raw water located inside the evaporator 61, and uses the waste heat generated by the electrolytic cell 1 as a heat source for heating.

[0070] The implementation principle of the electrolytic water hydrogen production system according to the embodiment of the present application is as follows: After connecting the anode and cathode of the electrolytic cell 1 to the power supply 2, the electrolytic cell 1 is in a working state. The cathode side 12 of the electrolytic cell 1 stores water, and the water diffuses through the electrolyte membrane to the anode side 11 of the electrolytic cell 1. The water on the anode side 11 of the electrolytic cell 1 decomposes into oxygen.

[0071] The vacuum pump 31 connected to the anode side 11 of the electrolytic cell 1 generates negative pressure on the anode side 11 of the electrolytic cell 1, which is beneficial to the removal of oxygen. At the same time, the liquid water diffusing to the anode side 11 can evaporate into water vapor in a negative pressure environment, avoiding the generation of bubbles on the anode side 11 of the electrolytic cell 1.

[0072] The anode side 11 of the electrolytic cell 1 is connected to the evaporator 61 provided. Under the action of negative pressure, the evaporator 61 evaporates raw water into water vapor, which enters the anode side 11 of the electrolytic cell 1, maintains the humidity of the anode side 11 of the electrolytic cell 1, humidifies the electrolyte membrane and can participate in the electrolysis reaction on the anode side 11.

[0073] The outlet end of the vacuum pump 31 is connected to the oxygen cooler 43. The mixed gas on the anode side 11 enters the inside of the oxygen gas-liquid separation tank 42 after being cooled by the oxygen cooler 43 for separation. The liquid water enters the inside of the water storage tank 44 through the drain pipe 423, and the gas is discharged through the gas outlet pipe 421 located above the oxygen gas-liquid separation tank 42.

[0074] The water storage tank 44 pumps the distilled water inside the water storage tank 44 into the cathode gas-liquid separator through the water supply pipe 441 and the water supply pump 442. The distilled water inside the cathode gas-liquid separator enters the inside of the coil 62 through the circulation pump 631, and then is transported to the cathode side 12 of the electrolytic cell 1. The cathode side 12 of the electrolytic cell 1 is passed through the coil 62 of the evaporator 61 with distilled water, and hydrogen is generated at the cathode of the electrolytic cell 1. The cathode outlet is connected to the cathode gas-liquid separation tank 51, so that the gas-liquid mixture generated on the cathode side 12 enters the inside of the cathode gas-liquid separation tank 51 for separation. The separated gas is discharged, and the separated liquid is recycled into the inside of the circulation pipe 63.

[0075] The liquid inside the cathode gas-liquid separation tank 51 is passed into the inside of the circulation pipe 63 and enters the evaporation coil 62, and the waste heat generated by the electrolytic cell 1 is used as a heat source to heat the raw water inside the evaporator 61.

[0076] In the present invention, the term "a plurality of" means at least two or more than two, unless otherwise clearly defined. Terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the description of this specification, the description of terms such as "an embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. An electrolytic water hydrogen production system, characterized in that: It includes an electrolytic cell (1). A vacuum assembly (3) is connected to the anode side (11) of the electrolytic cell (1). The vacuum assembly (3) forms a negative pressure on the anode side (11) of the electrolytic cell (1). An oxygen separation assembly (4) is arranged on one side of the vacuum assembly (3). The side of the oxygen separation assembly (4) facing away from the vacuum assembly (3) is relatively connected to the cathode side (12) of the electrolytic cell (1) to supply water to the cathode side (12) of the electrolytic cell (1).

2. The electrolytic water hydrogen production system according to claim 1, characterized in that: The vacuum assembly (3) includes a vacuum pump (31). The inlet of the vacuum pump (31) is relatively connected to the anode side (11) of the electrolytic cell (1), and the outlet of the vacuum pump (31) is relatively connected to the oxygen separation assembly (4).

3. The electrolytic water hydrogen production system according to claim 2, characterized in that: The oxygen separation assembly (4) includes an oxygen gas-liquid separation tank (42). The inlet of the oxygen gas-liquid separation tank (42) is relatively connected to the outlet of the vacuum pump (31).

4. The electrolytic water hydrogen production system according to claim 3, wherein: A gas outlet pipe (421) is fixedly connected to the side wall of the oxygen gas-liquid separation tank (42), and a drain pipe (423) is also fixedly connected to the side wall of the oxygen gas-liquid separation tank (42). The gas outlet pipe (421) relatively connects the inside of the oxygen gas-liquid separation tank (42) to the outside, and the drain pipe relatively connects the inside of the oxygen gas-liquid separation tank (42) to the outside.

5. The electrolytic water hydrogen production system according to claim 4, wherein: The gas outlet pipe (421) is located on the top wall of the oxygen gas-liquid separation tank (42), and the drain pipe is located on the bottom wall of the oxygen gas-liquid separation tank (42).

6. The electrolytic water hydrogen production system according to claim 4, characterized in that: The drain pipe (423) of the oxygen gas-liquid separation tank (42) is connected to a water storage tank (44), and the water storage tank (44) is used to store the liquid separated by the oxygen gas-liquid separation tank (42).

7. The electrolytic water hydrogen production system according to claim 1, wherein: A cathode gas-liquid separation tank (51) is connected to the cathode side (12) of the electrolytic cell (1), and the cathode gas-liquid separation tank (51) is relatively connected to the outlet of the cathode side (12) of the electrolytic cell (1).

8. The electrolytic water hydrogen production system according to claim 7, wherein: A water supply pipe (441) is fixedly connected to the side wall of the cathode gas-liquid separation tank (51), and the water supply pipe (441) is relatively connected to the inside of the cathode gas-liquid separation tank (51).

9. An electrolytic water hydrogen production system according to any one of claims 6 or 8, characterized in that: One end of the water supply pipe (441) facing away from the cathode gas-liquid separation tank (51) is relatively connected to the water storage tank (44).

10. The electrolytic water hydrogen production system according to claim 7, wherein: An exhaust pipe (511) is fixedly connected to the side wall of the cathode gas-liquid separation tank (51), and the exhaust pipe (511) is relatively connected to the inside of the cathode gas-liquid separation tank (51).

11. The electrolytic water hydrogen production system according to claim 9, wherein: A water supply pump (442) is fixedly connected to the water supply pipe (441), and the water supply pump (442) can pump the liquid inside the water storage tank (44) into the inside of the cathode gas-liquid separation tank (51).

12. The electrolytic water hydrogen production system according to claim 10, wherein: A hydrogen gas path regulating valve (512) is fixedly connected to the exhaust pipe (511), and the hydrogen gas path regulating valve (512) can control the opening and closing of the exhaust pipe (511).

13. The electrolytic water hydrogen production system according to claim 10, characterized in that: The exhaust pipe (511) is relatively connected to the top wall of the cathode gas-liquid separation tank (51).

14. The electrolytic water hydrogen production system according to claim 1, characterized in that: The anode side (11) of the electrolytic cell (1) is connected to an evaporator (61), and the liquid outlet of the evaporator (61) is relatively connected to the anode side (11) of the electrolytic cell (1).

15. The electrolytic water hydrogen production system according to claim 14, characterized in that: A coil (62) is fixedly connected to the interior of the evaporator (61), and the coil (62) heats the liquid inside the evaporator (61), and the heated liquid is input to the anode side (11) of the electrolytic cell (1) through a raw water pipe (612).

16. The electrolytic water hydrogen production system according to claim 15, wherein: The coil (62) comprises a water inlet section (621), the water inlet section (621) being located inside the evaporator (61) and being fixedly connected to a spiral section (622), and one end of the spiral section (622) facing away from the water inlet section (621) being fixedly connected to a water outlet section (623), and the water inlet section (621), the spiral section (622) and the water outlet section (623) are relatively connected.

17. The electrolytic water hydrogen production system according to claim 16, wherein: The spiral section (622) is located inside the evaporator (61), and the spiral section (622) is arranged in a spiral structure.

18. The electrolytic water hydrogen production system according to claim 16, characterized in that: One end of the water outlet section (623) facing away from the spiral section (622) is relatively connected to the cathode side (12) of the electrolytic cell (1).

19. An electrolytic water hydrogen production system according to any one of claims 7 or 14, characterized in that: The water inlet section (621) is relatively connected to the cathode gas-liquid separation tank (51) via a circulation pipe (63), and the liquid inside the cathode gas-liquid separation tank (51) enters the interior of the coil (62) from the circulation pipe (63).

20. The electrolytic water hydrogen production system according to claim 19, wherein: A circulation pump (631) is fixedly connected to the side wall of the circulation pipe (63), and the circulation pump (631) is capable of pumping the liquid inside the cathode gas-liquid separation tank (51) into the inside of the coil (62).

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