Pressurized proton exchange membrane water electrolysis hydrogen production system capable of continuously recovering low-concentration heavy water
By designing a pressurized proton exchange membrane electrolytic water hydrogen production system that continuously recovers low-concentration water, the problem of lack of effective recovery of low-concentration water in the existing technology is solved, and efficient and economical water electrolysis is achieved to produce heavy water in combination with heavy water, improving the economic and resource utilization rate of the project.
Patent Information
- Application Number
- CN202411852470.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-03-21
AI Technical Summary
The lack of effective methods for continuous production and recycling of low-concentration water in the prior art has led to problems of high energy consumption and poor economic benefits in the electrolytic water hydrogen production project of wind and photovoltaic power generation.
A pressurized proton exchange membrane electrolytic hydrogen production system is designed to continuously recover low-concentration water, including water treatment and purification module, PEM electrolytic hydrogen production module, hydrogen storage module and low-concentration aquatic product storage module. By optimizing the electrolysis process and setting up a high-pressure gas-water separator, the continuous recovery of low-concentration water is achieved.
It realizes the maximum co-production of low-concentration heavy water without affecting the normal operation of the electrolytic cell, reducing the energy consumption and cost of the electrolytic water hydrogen production project, and improving resource utilization and economic added value.
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Figure CN119663313A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of heavy water recovery, in particular to a pressurized proton exchange membrane water electrolysis hydrogen production system for continuously recovering low-concentration heavy water. Background Art
[0002] The scale of hydrogen production by water electrolysis of wind power and photovoltaic power generation is large, and large-scale, low-cost green hydrogen production technology is the key. Hydrogen production requires a large number of electrolyzers. At present, the investment in water electrolysis hydrogen production equipment is large and the power consumption of hydrogen is high, which seriously affects the cost and economic benefits of wind power and photovoltaic water electrolysis hydrogen production. There are three isotopes of hydrogen, namely protium, deuterium (heavy hydrogen) and tritium (super tritium). Heavy water is also called deuterated water, with the chemical formula D2O. Most hydrogen in nature exists in the form of protium, and the abundance of deuterium is relatively low, about 0.0156%, and the abundance of tritium is less than 0.001%. The discovery and production of heavy water were carried out in the early stage by the method of raw water electrolysis cascade and volume reduction concentration to achieve commercial production. Due to the low concentration of raw water and high power consumption, new technologies such as hydrogen sulfide dual temperature exchange and electrolytic catalytic exchange CECE were developed in the later stage, which became the main production process route at home and abroad, but there are also problems such as high energy consumption and great harm.
[0003] The main technologies for hydrogen production by water electrolysis include alkaline electrolyzer ALK, proton exchange membrane PEM, solid oxide SOEC, and anion exchange membrane. Currently, there are two electrolyzers used for commercial hydrogen production: alkaline electrolyzer ALK and proton exchange membrane PEM. PEM electrolyzer has the advantages of adapting to wind and solar fluctuations, high efficiency, high hydrogen pressure, and low pollution when using pure water electrolysis. Due to the difference in the physical properties of hydrogen isotopes during water electrolysis, deuterium is concentrated and enriched in the process. The isotope effect of protons transmitted in the Nafion membrane in the PEM electrolysis method can separate hydrogen isotopes. + The electromigration rate in the proton exchange membrane is D + Faster, in the cathode region D + The percentage of D2 will be smaller than that of the anode side phase, which further reduces the precipitation rate of D2. At the same time, the use of pure water electrolysis without impurities such as alkali solution creates better conditions for low-cost recovery of deuterium heavy water. In the prior art, for the PEM electrolyzer in the process of electrolyzing water to produce hydrogen in wind and solar power generation, only isolated hydrogen production solutions are usually provided, and there is a blank in the technology of continuous production and recovery of low-concentration heavy water. The prior art has not formed an effective solution for high efficiency and continuity. Summary of the invention
[0004] The purpose of the present invention is to provide a pressurized proton exchange membrane water electrolysis hydrogen production system for continuously recovering low-concentration heavy water in order to solve at least one of the above technical problems.
[0005] In a first aspect, an embodiment of the present invention provides a pressurized proton exchange membrane water electrolysis hydrogen production system for continuously recovering low-concentration heavy water, comprising: a water treatment and purification module, a PEM water electrolysis hydrogen production module, a hydrogen storage module and a low-concentration heavy water product storage module; wherein the PEM water electrolysis hydrogen production module comprises an electrolyzer anode module, an electrolyzer cathode module, a proton exchange membrane arranged between the electrolyzer anode module and the electrolyzer cathode module, an oxygen high-pressure gas-liquid separator module, a hydrogen high-pressure gas-liquid separator module and a low-pressure gas-liquid separator module; the output end of the water treatment and purification module is connected to the oxygen high-pressure gas-liquid separator module, the liquid output end of the oxygen high-pressure gas-liquid separator module is connected to the electrolyzer anode module, the output end of the electrolyzer anode module is connected to the input end of the oxygen high-pressure gas-liquid separator module, and the oxygen high-pressure gas-liquid separator module is connected to the liquid output end of the oxygen high-pressure gas-liquid separator module. The liquid output end of the separator module is also connected to the low-concentration heavy water product storage module through the low-pressure gas-liquid separator module; the output end of the electrolyzer cathode module is connected to the input end of the hydrogen high-pressure gas-liquid separator module, and the output end of the hydrogen high-pressure gas-liquid separator module is connected to the hydrogen storage module; the water of the oxygen high-pressure gas-liquid separator module enters the electrolyzer anode module for electrolysis, and the generated protons pass through the proton exchange membrane to the electrolyzer cathode module to form hydrogen, and the hydrogen is separated by the hydrogen high-pressure gas-liquid separator module and enters the hydrogen storage module; the water after electrolysis in the electrolyzer anode module enters the oxygen high-pressure gas-liquid separator module to form a cycle; the water after multiple cycles of electrolysis is separated by the low-pressure gas-liquid separator module to form low-concentration heavy water and enters the low-concentration heavy water product storage module.
[0006] Furthermore, it also includes a transformer and rectifier module and a water electrolysis energy management system module, the input end of the transformer and rectifier module is connected to the wind and solar power generation network, and the output end of the transformer and rectifier module and the water electrolysis energy management system module are both connected to the PEM water electrolysis hydrogen production module; the transformer and rectifier module is used to transform and rectify the electric energy of the wind and solar power generation network to supply power to the PEM water electrolysis hydrogen production module; the water electrolysis energy management system module is used to manage the power and energy of the PEM water electrolysis hydrogen production module.
[0007] Furthermore, a raw water storage module is provided between the water treatment and purification module and the oxygen high-pressure gas-liquid separator module; and the liquid output end of the low-pressure gas-liquid separator module is also connected to the raw water storage module.
[0008] Furthermore, the raw water at the input end of the water treatment and purification module includes surface fresh water and / or sea water; the water treatment and purification module is used to purify the raw water.
[0009] The present invention provides a pressurized proton exchange membrane water electrolysis hydrogen production system for continuously recovering low-concentration heavy water. Aiming at wind-solar grid-connected and off-grid water electrolysis hydrogen production, a method for continuously removing the balanced deuterium-containing concentrated water portion is established, and a hydrogen production process is established and optimized. Without affecting the normal operation of the electrolyzer, the maximum amount of low-concentration heavy water can be co-produced, thereby alleviating the technical problem of the prior art lacking a continuous production and recovery scheme for low-concentration heavy water in water electrolysis hydrogen production projects. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0011] Figure 1 A schematic diagram of the architecture of a pressurized proton exchange membrane water electrolysis hydrogen production system for continuously recovering low-concentration heavy water provided in an embodiment of the present invention.
[0012] In the figure: 1. Transformer rectifier module, 2. Water electrolysis energy management system module, 3. PEM water electrolysis hydrogen production module, 31. Electrolyzer anode module, 32. Oxygen high-pressure gas-liquid separator module, 33. Low-pressure gas-liquid separator module, 34. Electrolyzer cathode module, 35. Hydrogen high-pressure gas-liquid separator module, 36. Proton exchange membrane, 4. Hydrogen storage module, 5. Low-concentration heavy water product storage module, 6. Water treatment and purification module, 7. Raw water storage module. DETAILED DESCRIPTION
[0013] 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, not all of the embodiments. 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.
[0014] Embodiment 1
[0015] Figure 1 Schematic diagram of the structure of a pressurized proton exchange membrane water electrolysis hydrogen production system for continuously recovering low-concentration heavy water according to an embodiment of the present invention. Figure 1As shown, the system includes: a water treatment and purification module 6, a PEM water electrolysis hydrogen production module 3, a hydrogen storage module 4 and a low-concentration heavy water product storage module 5; wherein the PEM water electrolysis hydrogen production module 3 includes an electrolyzer anode module 31, an electrolyzer cathode module 34, a proton exchange membrane 36 arranged between the electrolyzer anode module 31 and the electrolyzer cathode module 34, an oxygen high-pressure gas-liquid separator module 32, a hydrogen high-pressure gas-liquid separator module 35 and a low-pressure gas-liquid separator module 32.
[0016] Specifically, Figure 1 As shown, the output end of the water treatment and purification module 6 is connected to the oxygen high-pressure gas-liquid separator module 32, the liquid output end of the oxygen high-pressure gas-liquid separator module 32 is connected to the electrolyzer anode module 31, the output end of the electrolyzer anode module 31 is connected to the input end of the oxygen high-pressure gas-liquid separator module 32, and the liquid output end of the oxygen high-pressure gas-liquid separator module 32 is also connected to the low-concentration heavy water product storage module 5 through the low-pressure gas-liquid separator module 33; the output end of the electrolyzer cathode module 31 is connected to the input end of the hydrogen high-pressure gas-liquid separator module 35, and the output end of the hydrogen high-pressure gas-liquid separator module 35 is connected to the hydrogen storage module 4.
[0017] Specifically, the water in the oxygen high-pressure gas-liquid separator module 32 enters the electrolyzer anode module 31 for electrolysis, and the generated protons pass through the proton exchange membrane 36 to the electrolyzer cathode module 34 to form hydrogen, and the hydrogen is separated by the hydrogen high-pressure gas-liquid separator module 35 and enters the hydrogen storage module 4; the water after electrolysis in the electrolyzer anode module 31 enters the oxygen high-pressure gas-liquid separator module 32 to form a cycle; the water after multiple cycles of electrolysis is separated by the low-pressure gas-liquid separator module 33 to form low-concentration heavy water and enters the low-concentration heavy water product storage module 5.
[0018] Specifically, Figure 1 As shown, the system provided by the embodiment of the present invention also includes a transformer and rectifier module 1 and a water electrolysis energy management system module 2. The input end of the transformer and rectifier module 1 is connected to the wind and solar power generation network, and the output end of the transformer and rectifier module 1 and the water electrolysis energy management system module 2 are both connected to the PEM water electrolysis hydrogen production module 3.
[0019] Specifically, the transformer and rectifier module 1 includes a transformer and a rectifier AC-DC, which is used to transform and rectify the electric energy of the wind and solar power generation network to supply power to the PEM water electrolysis hydrogen production module 3;
[0020] The water electrolysis energy management system module 2 is used to manage the power and energy of the PEM water electrolysis hydrogen production module 3.
[0021] Specifically, the electricity from the wind and photovoltaic power plants is collected and connected to the transformer and rectifier AC-DC for voltage and DC adjustment, and the DC is used as the power source for the PEM water electrolysis hydrogen production module 3. The water electrolysis energy management system module 2 manages the system power and energy, provides the voltage, current, pressure, and temperature required for the operation of the electrolyzer of the PEM water electrolysis hydrogen production module 3, provides electrical energy and thermal energy management, and combines with the outside for overall control management.
[0022] Specifically, Figure 1 As shown, a raw water storage module 7 is also provided between the water treatment and purification module 6 and the oxygen high-pressure gas-liquid separator module 32 ; and the liquid output end of the low-pressure gas-liquid separator module 33 is also connected to the raw water storage module 7 .
[0023] In an optional implementation provided by the embodiment of the present invention, the raw water at the input end of the water treatment and purification module 6 includes surface fresh water and / or seawater.
[0024] Specifically, the water treatment and purification module 6 is used to purify the raw water.
[0025] Specifically, the high-purity water after the raw water is purified by the water treatment and purification module 6 enters the raw water storage module 7, and the pure water from the output end of the raw water storage module 7 is connected to the PEM water electrolysis hydrogen production module 3. Under the action of electricity, the PEM electrolyzer decomposes water into hydrogen and oxygen. Hydrogen containing water is formed in the cathode module 34 of the electrolyzer and enters the hydrogen high-pressure gas-liquid separator module 35 for separation. The hydrogen obtained by the upper separation enters the hydrogen storage module 4, and the lower water in the hydrogen high-pressure gas-liquid separator module 35 is intermittently removed for recycling.
[0026] At the same time, oxygen is electrolyzed in the electrolytic cell anode module 31. During the electrolysis process, due to the difference in the ionization and separation of protium and deuterium, deuterium is concentrated in the electrolyte and separated water containing concentrated deuterium enters the anode circulating raw water. After a period of electrolysis and circulation, it is concentrated to form balanced deuterium-containing concentrated water. The oxygen and water obtained by electrolysis in the electrolytic cell anode module 31 enter the oxygen high-pressure gas-liquid separator module 32. The upper oxygen is discharged or utilized after treatment, and the lower water and the supplemented water are mixed and enter the PEM electrolytic cell anode to continue water electrolysis.
[0027] The lower part of the oxygen high-pressure gas-liquid separator module 32 is connected to the low-pressure gas-liquid separator module 33 through a pipeline through pressure regulation control. The high-pressure balanced deuterium-containing concentrated water formed after cyclic electrolysis flows into the low-pressure gas-liquid separator module 33, and the miscible oxygen in the upper part is discharged or utilized after treatment, and the lower high-pressure balanced deuterium-containing concentrated water enters the low-concentration heavy water product storage module 5 as an external product. It enters the electrolytic cell for further concentration as needed, or enters the electrolytic catalytic exchange CECE system to obtain heavy water with higher concentration.
[0028] The raw water is surface fresh water and seawater. The abundance of deuterium in heavy water is relatively low, about 0.0156%. After electrolytic concentration, the low-concentration heavy water product generally reaches 0.045% to 1.0%, which can be reprocessed and utilized as a higher-concentration heavy water raw material.
[0029] The invention provides a pressurized proton exchange membrane water electrolysis hydrogen production system for continuously recovering low-concentration heavy water. The electrolyzer can work normally between 10% and 120% of its rated power. The hydrogen production pressure of the water electrolysis hydrogen production system is generally 3 to 10 MPa.
[0030] Embodiment 2
[0031] refer to Figure 1 When working, the wind and photovoltaic power generation field collects electricity and connects to the transformer rectifier module 1 for voltage and DC adjustment. The DC power is used as the power supply of the PEM water electrolysis hydrogen production module 3. The power of a single PEM electrolyzer is generally 1-5MW or multiple PEM electrolyzers reach 1-5MW. It is also suitable for large-scale hydrogen production systems with multiple electrolyzers. The present invention uses a PEM electrolyzer as an example. In order to ensure external transmission, a high-pressure electrolyzer system is generally used. The hydrogen production pressure is generally 3.0MPa-6MPa, and the power consumption of the electrolyzer is 4.0-5.0Kwh / NM3h, which can work normally between 10% and 120% of its rated power.
[0032] The raw water can be made of fresh water or seawater, and the high-purity water obtained by the water treatment and purification module 6 enters the raw water storage module 7. The pure water stored in the raw water storage module 7 has an original deuterium content of about 0.015%, which is supplemented into the oxygen high-pressure gas-liquid separator module 32 and mixed, and then enters the PEM electrolysis water hydrogen production module 3 as electrolysis raw water to produce hydrogen and oxygen. The water intake is about 200-1000Kg / h, the hydrogen amount is about 200-1000Nm3 / h, the pressure is 3-10MPa, and the oxygen amount is about 100-5000Nm3 / h, and the pressure is 3-6MPa.
[0033] The waste heat generated in the process is treated by liquid cooling or air cooling, and the system power and energy are managed by the water electrolysis energy management system module 2 to maintain stable operation of the system, and the temperature of the electrolyzer is about 45-90°C. The water electrolysis energy management system module 2 provides the PEM water electrolysis hydrogen production module 3 with the voltage, current, pressure, and temperature required for the operation of the electrolyzer, provides power and thermal energy management, and combines with the outside for overall control management.
[0034] In a 1-5MW PEM electrolyzer, hydrogen containing water is formed in the cathode module 34 of the electrolyzer and enters the hydrogen high-pressure gas-liquid separator module 35 for separation. The hydrogen obtained by the upper separation enters the hydrogen storage module 4 for external transmission and utilization. The oxygen and water obtained by electrolysis in the anode module 31 of the electrolyzer enter the oxygen high-pressure gas-liquid separator module 32. The upper oxygen is discharged or utilized after treatment, and the lower water is mixed with the supplementary raw water and enters the anode of the PEM electrolyzer to continue water electrolysis and hydrogen production. During the electrolysis process, due to the difference in the ionization and separation of protium and deuterium, deuterium is concentrated in the electrolyte and separated water containing concentrated deuterium enters the anode circulating raw water. After a period of electrolysis and circulation, it is concentrated to form equilibrium deuterium-containing concentrated water. The concentration increases with the electrolysis time, the separation coefficient of hydrogen and deuterium on the catalyst, and the concentration of electrolyzed water. When the concentration reaches 0.045-0.15% from about 0.015% in the raw pure water through the detection concentration, the lower part of the oxygen high-pressure gas-liquid separator module 32 (pressure 3-6MPa) is connected to the low-pressure gas-liquid separator module 32 through the pressure regulation control, and the high-pressure balanced deuterium-containing concentrated water flows into the low-pressure gas-liquid separator module 32 (pressure 0.5-2MPa), the miscible oxygen in the upper part is discharged or utilized after treatment, and the lower balanced deuterium-containing concentrated water enters the low-concentration heavy water product storage module 5, with a concentration of 0.045-0.15% as an external product. It enters the electrolytic cell for further concentration as needed, or enters the electrolytic catalytic exchange CECE system to obtain higher concentration heavy water.
[0035] From the above description, it can be seen that the embodiment of the present invention provides a pressurized proton exchange membrane water electrolysis hydrogen production system for continuously recovering low-concentration heavy water, which has the following technical effects compared with the prior art:
[0036] (1) The system provided by the present invention has high hydrogen pressure, high purity, and no impurity pollution during pure water electrolysis.
[0037] (2) The present invention uses a high-pressure PEM electrolyzer and pure water electrolysis without impurity pollution, and the low-concentration heavy water produced is more suitable for the next-level electrolysis to continue to concentrate and combine technical applications. The present invention realizes the co-production and recovery of heavy water raw materials by water electrolysis, obtains resource utilization and economic added value of heavy water raw material upgrading projects with economic value, and provides support for the development of the green hydrogen industry.
[0038] (3) The existing PEM electrolyzer and system for producing hydrogen by electrolysis of water do not take into account the concentration process of deuterium in heavy water during the water electrolysis process. By setting up a high-pressure gas-water separator and a low-pressure gas-water separator on the anode side, the present invention establishes a method for continuously removing the concentrated water containing deuterium in a balanced manner, establishes and optimizes the hydrogen production process, and achieves the maximum amount of co-production of low-concentration heavy water without affecting the normal operation of the electrolyzer.
[0039] (4) The existing water electrolysis hydrogen production project uses PEM electrolyzers to provide only isolated hydrogen production solutions, without considering the concentration process and utilization method of heavy water in the water electrolysis process. The present invention establishes and optimizes the hydrogen production process by establishing a method for continuous electrolysis of the balanced deuterium-containing concentrated water portion, and achieves the maximum amount of co-production of low-concentration heavy water without affecting the normal operation of the hydrogen production plant.
[0040] (5) Existing water electrolysis hydrogen production projects only provide isolated hydrogen production solutions, without considering the impact of the deuterium concentration process of heavy water on the electrodes and potential environmental impacts during water electrolysis. The present invention realizes the co-production and recovery of heavy water raw materials by water electrolysis hydrogen production, while reducing the environmental hazards that may be caused by waste liquid discharge and turning waste into treasure.
[0041] (6) To further improve the recovery efficiency of deuterated heavy water, targeted development is carried out on the selectivity of the cathode and anode catalysts and membrane materials of the PEM electrolyzer, the technical parameters and process conditions of water electrolysis are optimized, the separation efficiency and recovery rate of deuterium are improved, and more efficient water electrolysis hydrogen production and heavy water co-production are achieved, further improving the economic efficiency of the project.
[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A pressurized proton exchange membrane water electrolysis hydrogen production system for continuous recovery of low-concentration heavy water, characterized in that: include: A water treatment and purification module, a PEM water electrolysis hydrogen production module, a hydrogen storage module and a low-concentration heavy water product storage module; wherein the PEM water electrolysis hydrogen production module includes an electrolyzer anode module, an electrolyzer cathode module, a proton exchange membrane arranged between the electrolyzer anode module and the electrolyzer cathode module, an oxygen high-pressure gas-liquid separator module, a hydrogen high-pressure gas-liquid separator module and a low-pressure gas-liquid separator module; The output end of the water treatment and purification module is connected to the oxygen high-pressure gas-liquid separator module, the liquid output end of the oxygen high-pressure gas-liquid separator module is connected to the electrolyzer anode module, the output end of the electrolyzer anode module is connected to the input end of the oxygen high-pressure gas-liquid separator module, and the liquid output end of the oxygen high-pressure gas-liquid separator module is also connected to the low-concentration heavy water product storage module through the low-pressure gas-liquid separator module; the output end of the electrolyzer cathode module is connected to the input end of the hydrogen high-pressure gas-liquid separator module, and the output end of the hydrogen high-pressure gas-liquid separator module is connected to the hydrogen storage module; The water in the oxygen high-pressure gas-liquid separator module enters the electrolyzer anode module for electrolysis, and the generated protons pass through the proton exchange membrane to the electrolyzer cathode module to form hydrogen, and the hydrogen is separated by the hydrogen high-pressure gas-liquid separator module and enters the hydrogen storage module; The water after electrolysis in the electrolytic cell anode module enters the oxygen high-pressure gas-liquid separator module to form a cycle; the water after multiple cycles of electrolysis is separated by the low-pressure gas-liquid separator module to form low-concentration heavy water and enters the low-concentration heavy water product storage module.
2. The pressurized proton exchange membrane water electrolysis hydrogen production system for continuous recovery of low-concentration heavy water according to claim 1, characterized in that: It also includes a transformer and rectifier module and a water electrolysis energy management system module, wherein the input end of the transformer and rectifier module is connected to a wind and solar power generation network, and the output end of the transformer and rectifier module and the water electrolysis energy management system module are both connected to the PEM water electrolysis hydrogen production module; The transformer and rectifier module is used to transform and rectify the electric energy of the wind and solar power generation network to supply power to the PEM water electrolysis hydrogen production module; The water electrolysis energy management system module is used to manage the power and energy of the PEM water electrolysis hydrogen production module.
3. The pressurized proton exchange membrane water electrolysis hydrogen production system for continuous recovery of low-concentration heavy water according to claim 1, characterized in that: A raw water storage module is also arranged between the water treatment and purification module and the oxygen high-pressure gas-liquid separator module; and the liquid output end of the low-pressure gas-liquid separator module is also connected to the raw water storage module.
4. The pressurized proton exchange membrane water electrolysis hydrogen production system for continuous recovery of low-concentration heavy water according to claim 1, characterized in that: The input raw water of the water treatment and purification module includes surface fresh water and / or sea water; The water treatment and purification module is used to purify the raw water.