A continuous large-scale wind and solar power generation electrolysis water hydrogen production and heavy water co-production system and method
By designing a continuous large-scale wind and photoelectric power generation electrolytic hydrogen production heavy water system, the problems of high hydrogen production consumption and low recovery efficiency of heavy water deuterium in large-scale wind and photoelectric power generation and electrolytic hydrogen production projects have been solved, and the heavy water raw materials are recovered while water electrolytic hydrogen production, reducing costs and environmental hazards.
Patent Information
- Application Number
- CN202510008213.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-04-08
AI Technical Summary
In large-scale wind and photoelectric power generation and electrolytic hydrogen production projects, hydrogen production consumes high power and costs, and the existing technology fails to effectively recover and utilize heavy water deuterium concentrated during water electrolysis, affecting the economics and environmental protection of the project.
A continuous large-scale wind and photoelectric power generation electrolytic hydrogen production heavy water system is designed. By improving the system configuration and optimizing the water electrolytic process, it realizes the hydroelectric hydrogen production and co-production and recovery of heavy water raw materials. It uses a proton exchange membrane PEM electrolytic water hydrogen production equipment to reduce the impact of alkalinity and concentrate heavy water through multi-stage electrolysis.
It realizes the recovery of high added value-added heavy water raw materials while electrolyzing water hydrogen production, reduces the cost of hydrogen production, reduces the environmental hazards of waste liquid emissions, and improves the economic and resource utilization efficiency of the project.
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Figure FT_1
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of wind and solar power generation, water electrolysis hydrogen production, and heavy water deuterium recovery of renewable energy, and relates to a continuous large-scale wind and solar power generation water electrolysis hydrogen production and heavy water co-production system and method. Background Art
[0002] The energy industry is accelerating its green and low-carbon transformation, and renewable energy wind power and photovoltaics are developing rapidly. The proportion of renewable energy hydrogen production in terminal energy consumption has increased significantly, playing an important supporting role in the green transformation and development of energy. Renewable energy wind and solar power generation through water electrolysis hydrogen production projects are being actively promoted. The industrial scale of water electrolysis hydrogen production is large and will become an important component of terminal energy.
[0003] Wind power and photovoltaic water electrolysis hydrogen production is large-scale, and large-scale, low-cost green hydrogen production technology is key. Hydrogen production requires a large number of electrolyzers. At present, water electrolysis hydrogen production equipment has large investment and high hydrogen power consumption, which seriously affects the cost and economic benefits of wind power and photovoltaic water electrolysis hydrogen production. Water electrolysis hydrogen production technology mainly includes alkaline electrolyzer ALK, proton exchange membrane PEM, solid oxide SOEC, and anion exchange membrane. Currently, the two electrolyzers used for commercial hydrogen production are alkaline electrolyzer ALK and proton exchange membrane PEM.
[0004] There are three isotopes of hydrogen, namely protium, deuterium (heavy hydrogen) and tritium (super tritium). Heavy water is also called deuterated water, and its chemical formula is D2O. Most hydrogen in nature exists in the form of protium. The abundance of deuterium is relatively low, about 0.0156%, and the abundance of tritium is less than 0.001%. Heavy water is colorless and transparent, has no taste, cannot burn, and will not explode. Pure heavy water has a boiling point of 101.4°C and a density of 1.1 g / cm 3 (Room temperature), 10% heavier than ordinary water, so it is called heavy water. Deuterium has a wide range of uses. Heavy water (deuterium) is called the "natural fuel of the future". It is an important raw material for controlled nuclear fusion and is used in large quantities in semiconductors, medicine and other fields. The discovery and production of heavy water were carried out in the early days by using 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 later, becoming the main production process route at home and abroad. However, there are also problems such as high energy consumption and high harmfulness.
[0005] With the development of the trend of green and low-carbon energy transformation, large-scale gigawatt and 100-megawatt wind and solar power generation and water electrolysis hydrogen production projects are being promoted. The hydrogen production of a single project exceeds tens of thousands of tons / year, and the electricity consumption of hydrogen production is about 4.3-5.0Kwh / NM 3High power consumption and high cost are the core issues restricting the development of green hydrogen. Due to the difference in the physical properties of hydrogen isotopes during water electrolysis, deuterium and tritium are concentrated and enriched in the process, creating conditions for low-cost recovery of deuterium in heavy water. At the same time, as people's awareness of environmental protection increases, the treatment of deuterium and tritium in heavy water concentrated and enriched during the electrolysis process needs to be paid attention to. It is the focus of research and treatment in the process of energy utilization, and recycling and utilization provide guarantees for sustainable development.
[0006] Combined with large-scale renewable energy wind and solar power generation, the hydrogen production process water electrolysis process is coupled with electrochemistry to enrich hydrogen isotope deuterium, so as to achieve the production of green hydrogen while recovering high value-added heavy water raw materials, further improve the economic efficiency of the current wind and solar power generation water electrolysis hydrogen production project, and then reduce the cost of nuclear energy raw material heavy water, providing a material basis for expanding energy development. At present, there is a blank in the technology of continuous production and recovery of low-concentration heavy water in the large-scale wind and solar power generation water electrolysis hydrogen production process, and the existing technology has not formed a solution system and method. Summary of the invention
[0007] The object of the present invention is to provide a continuous large-scale wind-solar power generation water electrolysis hydrogen production co-production heavy water system and method.
[0008] The present invention aims at the characteristics of large-scale wind and solar hydrogen production, and aims at grid-connected and off-grid water electrolysis hydrogen production, improves the system configuration and optimizes the water electrolysis process, realizes water electrolysis hydrogen production and simultaneous co-production and recovery of heavy water raw materials, obtains economically valuable heavy water raw materials, improves the resource utilization and economic added value of the project, and at the same time reduces the environmental hazards that may be caused by waste liquid discharge, turning waste into treasure, and providing support for the development of emerging green hydrogen industries and future industries.
[0009] To achieve the above object, the present invention provides a continuous large-scale wind-solar power generation water electrolysis hydrogen production and heavy water co-production system, which comprises: Wind power generation and / or photovoltaic power generation module, power collection access module, transformer and rectifier AC-DC module, water pretreatment and purification device module, primary water electrolysis hydrogen production module, secondary water electrolysis hydrogen production module, tertiary water electrolysis hydrogen production module, hydrogen storage module, concentrated heavy water product storage module; The wind power generation and / or photovoltaic power generation module is connected to the power collection access module through a cable, and the output end of the power collection access module is connected to the transformer and rectifier AC-DC module; the output end of the transformer and rectifier AC-DC module is connected to the primary water hydrogen production module, the secondary water electrolysis hydrogen production module and the tertiary water electrolysis hydrogen production module in sequence; The water pretreatment and purification device module is connected to the primary water hydrogen production module through the pure water storage module, the output end of the primary water hydrogen production module is connected to the hydrogen storage module, and the output end of the tertiary water electrolysis hydrogen production module is connected to the concentrated heavy water product storage module.
[0010] In the present invention, the wind power generation and / or photovoltaic power generation module is used for wind power and / or photovoltaic power generation.
[0011] In the above-mentioned continuous large-scale wind-solar power generation, water electrolysis, hydrogen production and heavy water co-production system, the output end of the wind power generation and / or photovoltaic power generation module is connected to the electric energy storage system module to store the excess electricity produced by the wind power generation and / or photovoltaic power generation module.
[0012] In the above-mentioned continuous large-scale wind-solar power generation water electrolysis hydrogen production and heavy water co-production system, the continuous large-scale wind-solar power generation water electrolysis hydrogen production and heavy water co-production system also includes a water electrolysis energy management system module; The water electrolysis energy management system module is connected to the transformer and rectifier AC-DC module, and is used to manage system power to supply the primary water electrolysis hydrogen production module, the secondary water electrolysis hydrogen production module and the tertiary water electrolysis hydrogen production module, and other AC output power is provided to other users of the system.
[0013] In the above-mentioned continuous large-scale wind-solar power generation water electrolysis hydrogen production and heavy water co-production system, the primary water hydrogen production module, the secondary water electrolysis hydrogen production module, and the tertiary water electrolysis hydrogen production module are all equipped with PEM water electrolysis hydrogen production equipment containing a proton exchange membrane.
[0014] The present invention also provides a method for generating electricity, electrolyzing water, producing hydrogen and co-producing heavy water by using the above-mentioned continuous large-scale wind-solar power generation, electrolyzing water, producing hydrogen and co-producing heavy water system, comprising the following steps: 1) The wind power generation and / or photovoltaic power generation module is used to generate electricity from wind and light, and the generated electricity is connected to the power collection access module through a cable. The output end of the power collection access module is connected to the transformer and rectifier AC-DC module to transform and rectify the electricity; 2) Treating and purifying water through the water pretreatment and purification device module to obtain pure water, and the pure water enters the pure water storage module. The output end of the pure water storage module connects the pure water to the primary water electrolysis hydrogen production module. Under the action of the power output by the transformer and the rectifier AC-DC module, the electrolyzed water is decomposed into hydrogen and oxygen, and the water electrolysis produces balanced deuterium-containing concentrated water; the balanced deuterium-containing concentrated water enters the secondary water electrolysis hydrogen production module for electrolysis hydrogen production, and at the same time produces higher concentration of balanced deuterium-containing concentrated water, and then enters the tertiary water electrolysis hydrogen production module for electrolysis hydrogen production to obtain high-concentration heavy water, which is recovered to the concentrated heavy water product storage module; The hydrogen generated above enters the hydrogen storage module for storage and is exported to hydrogen users for utilization.
[0015] In the above method, the electricity generated in step 1) is electrolyzed into water in step 2), and the excess electricity is stored in the electric energy storage system module.
[0016] In the above method, the water electrolysis energy management system module manages the power output by the transformer and rectifier AC-DC module to supply the primary water electrolysis hydrogen production module, the secondary water electrolysis hydrogen production module and the tertiary water electrolysis hydrogen production module, and other AC output power is provided to other users of the system.
[0017] In the above method, in step 2), the primary water hydrogen production module, the secondary water electrolysis hydrogen production module, and the tertiary water electrolysis hydrogen production module all adopt the PEM water electrolysis hydrogen production method to electrolyze water to produce hydrogen.
[0018] In the above method, the current density used in the PEM water electrolysis hydrogen production method can be 0.5~3A / cm 2 , specifically 1A / cm 2 , 0.5~1A / cm 2 , 1~3A / cm 2 , the temperature may be 40~70°C, specifically 50°C, 40~50°C or 50~70°C.
[0019] The present invention has the following beneficial effects: 1. In the present invention, wind power generation and photovoltaic power generation electrolyze water to produce dehydrogenated gas which enters the hydrogen storage device. The balanced deuterium-containing concentrated water produced by water electrolysis continuously enters the concentrated water electrolysis device, and the generated hydrogen enters the hydrogen storage device; the by-product oxygen is discharged or comprehensively utilized; after multi-stage electrolysis, the concentrated water can enter the storage tank and be shipped as a heavy water raw material product. The existing water electrolysis hydrogen production project only provides an isolated hydrogen production scheme, without considering the concentration process and utilization method of deuterium in heavy water during water electrolysis. The present invention realizes water electrolysis hydrogen production and simultaneous co-production and recovery of heavy water raw materials, obtains resource utilization and economic added value of heavy water raw materials with economic value, and provides support for the development of emerging green hydrogen industries and future industries.
[0020] 2. At present, it is obtained by water electrolysis through the alkali capacity method, using alkaline water electrolyzer technology, which has the problems of high power consumption cost and difficult to deal with the impurities caused by alkali solution. The present invention adopts pure water proton exchange membrane water electrolysis to produce hydrogen, eliminates the alkaline effect, realizes the co-production and recovery of heavy water raw materials, and can reduce the environmental harm caused by waste liquid discharge.
[0021] 3. Currently, the existing water electrolysis hydrogen production projects only provide isolated hydrogen production solutions, without considering the concentration process of deuterium in heavy water during water electrolysis. 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.
[0022] 4. Existing water electrolysis hydrogen production projects only provide isolated hydrogen production solutions, without considering the concentration process of deuterium in heavy water during water electrolysis and its potential environmental impact. The present invention realizes water electrolysis hydrogen production and co-production and recovery of heavy water raw materials, while reducing the environmental hazards that may be caused by waste liquid discharge and turning waste into treasure.
[0023] 5. In order to further improve the recovery efficiency of deuterium heavy water, targeted development is carried out on the selectivity of the catalyst of the PEM electrolyzer, and the technical parameters of water electrolysis such as current density and temperature are optimized to improve the separation efficiency and recovery rate of deuterium, achieve more efficient water electrolysis hydrogen production and co-production of heavy water, and further improve the economic efficiency of the project. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a continuous large-scale wind and solar power generation electrolysis water hydrogen production and heavy water co-production system.
[0025] The reference numerals are as follows: 1 Wind power generation and / or photovoltaic power generation module, 2 Energy storage system module, 3 Power collection and access module, 4 Water electrolysis energy management system, 5 Transformer and rectifier AC-DC module, 6 Primary water electrolysis hydrogen production module, 7 Secondary water electrolysis hydrogen production module, 8 Tertiary water electrolysis hydrogen production module, 9 Hydrogen storage module, 10 Concentrated water product storage module, 11 Water pretreatment and purification device module, 12 Pure water storage module. DETAILED DESCRIPTION
[0026] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.
[0027] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.
[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all 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.
[0029] like Figure 1 As shown, a continuous large-scale wind-solar power generation water electrolysis hydrogen production and heavy water co-production system and method, the system includes: a wind power generation and / or photovoltaic power generation module 1, an electric energy storage system module 2, a power collection access module 3, a water electrolysis energy management system module 4, a transformer and rectifier AC-DC module 5, a water pretreatment and purification device module 11, a primary water electrolysis hydrogen production module 6, a secondary water electrolysis hydrogen production module 7, a tertiary water electrolysis hydrogen production module 8, a hydrogen storage module 9, and a concentrated heavy water product storage module 10; The wind power generation and / or photovoltaic power generation module 1 is connected to the power collection access module 3 through a cable. The excess power generated by the wind power generation and / or photovoltaic power generation module 1 is connected to the electric energy storage system module 2 at the output end for storage; the output end of the power collection access module 3 is connected to the transformer and rectifier AC-DC module 5; the output end of the transformer and rectifier AC-DC module 5 is connected to the primary water hydrogen production module 6, the secondary water electrolysis hydrogen production module 7 and the tertiary water electrolysis hydrogen production module 8 in sequence; the water electrolysis energy management system module 4 is connected to the transformer and rectifier AC-DC module 5, and is used to manage the system power to supply the primary water electrolysis hydrogen production module 6, the secondary water electrolysis hydrogen production module 7 and the tertiary water electrolysis hydrogen production module 8, and other AC output power is provided to other users of the system; The water pretreatment and purification device module 11 is connected to the primary water hydrogen production module 6 through the pure water storage module 12 , the output end of the primary water hydrogen production module 6 is connected to the hydrogen storage module 9 , and the output end of the tertiary water electrolysis hydrogen production module 8 is connected to the concentrated water product storage module 10 .
[0030] Furthermore, the primary water hydrogen production module 6, the secondary water electrolysis hydrogen production module 7, and the tertiary water electrolysis hydrogen production module 8 are all provided with PEM water electrolysis hydrogen production equipment containing a proton exchange membrane.
[0031] The method provided by the present invention for generating electricity, electrolyzing water, producing hydrogen and producing heavy water by using the above-mentioned continuous large-scale wind-solar power generation, electrolyzing water, producing hydrogen and producing heavy water system comprises the following steps: 1) The power generated by the wind photovoltaic power plant module 1 is connected to the power collection access module 3 through a cable, and the excess power is connected to the energy storage system module 2. The stored electric energy is connected to the power collection access module 3 through the output end to supply water electrolysis hydrogen production; the output end of the power collection access module 3 is mainly used for voltage and DC adjustment with the transformer and rectifier AC-DC module 5, and the water electrolysis energy management system module 4 manages the system power and energy. The main DC power is provided to the primary water electrolysis hydrogen production system 6, the secondary water electrolysis hydrogen production module 7, and the tertiary water electrolysis hydrogen production module 8 through the output end of the transformer and rectifier AC-DC module 5, and other AC output power is provided to other users of the system; 2) The raw water is purified by the water pretreatment and purification device module 11 and enters the pure water storage module 12. The pure water from the output end of the pure water storage module 12 is connected to the primary water electrolysis hydrogen production module 6. Under the action of electricity, the PEM electrolyzer decomposes the water into hydrogen and oxygen. The water-gas separation unit on the anode side of the electrolyzer separates the oxygen. During the electrolysis process, due to the difference in the ionization and separation of protium and deuterium, deuterium is concentrated in the electrolyte. The separated water with concentrated deuterium enters the circulating raw water. After a period of electrolysis and circulation, it is concentrated to form a balanced deuterium-containing concentrated water. The equilibrium deuterium-containing concentrated water produced by the primary water electrolysis hydrogen production module 6 continuously enters the raw material buffer of the secondary water electrolysis hydrogen production module 7 through buffer separation, and electrolysis hydrogen production is carried out in the secondary water electrolysis hydrogen production module 7, and at the same time, equilibrium deuterium-containing concentrated water with higher concentration is produced; the equilibrium deuterium-containing concentrated water produced by the secondary water electrolysis hydrogen production module 7 continuously enters the raw material buffer of the tertiary water electrolysis hydrogen production module 8, and electrolysis hydrogen production is carried out in the secondary water electrolysis hydrogen production module 7. At the same time, after continuous three-stage electrolysis, the equilibrium deuterium-containing concentrated water can enter the storage tank as a heavy water raw material product to be shipped out of the factory, or directly enter the heavy water distillation system to obtain high-concentration heavy water, or enter the electrolytic catalytic exchange CECE system to obtain high-concentration heavy water, and the high-concentration heavy water can be shipped out of the factory as a commodity; the hydrogen produced by the primary water electrolysis hydrogen production module 6, the secondary water electrolysis hydrogen production module 7, and the tertiary water electrolysis hydrogen production module 8 enters the hydrogen storage module 9, and the hydrogen output from the hydrogen storage module 9 can be externally transported to hydrogen users for use.
[0032] In a specific embodiment, the oxygen by-product of the primary water electrolysis hydrogen production module 6, the secondary water electrolysis hydrogen production module 7, and the tertiary water electrolysis hydrogen production module 8 is discharged or comprehensively utilized.
[0033] In a specific embodiment, the raw water is surface fresh water and seawater, and the abundance of deuterium in heavy water is relatively low, about 0.0156%. After electrolytic concentration, the low-concentration heavy water product generally reaches 0.3%~5%, which can be reprocessed as a raw material for high-concentration heavy water of about 99.7%.
[0034] In a specific embodiment, the electrolyzer in the water electrolysis hydrogen production system is a PEM electrolyzer, and the electrolyzer can operate 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.
[0035] In a specific embodiment, the current density used in the PEM water electrolysis hydrogen production method is 0.5~3A / cm 2 , the temperature is 40~70℃.
[0036] In a specific embodiment, wind power generation and photovoltaic power generation are volatile, and excess, periodic electricity enters energy storage to support water electrolysis to produce hydrogen and system energy.
[0037] Example 1 like Figure 1As shown, when working, the wind photovoltaic power generation device module 1, one or more wind turbines and photovoltaic power generation 100~600MW, wind power generation has large fluctuations and changes every day and every hour, photovoltaic power generation has strong periodicity during the day and no periodicity at night, and the redundant, fluctuating, and periodic wind power generation and photovoltaic power generation enter the energy storage system module 2 as water electrolysis hydrogen production and system energy support. The emitted power is connected to the power collection access module 3, and the output end of the power collection access module 3 is adjusted with the transformer and rectifier AC-DC module 5 for voltage and DC adjustment. The main DC power is provided to the primary water electrolysis hydrogen production module 6, the secondary water electrolysis hydrogen production module 7, and the tertiary water electrolysis hydrogen production module 8 through the output end of the transformer and rectifier AC-DC module 5. The fresh water or seawater is stored in the pure water storage module 12 after the water pretreatment and purification device module 11. The deuterium content of heavy water is about 0.015%, and enters the primary water electrolysis hydrogen production module 6 to produce hydrogen and oxygen. The waste heat generated in the process is treated by liquid cooling or air cooling to keep the system running stably.
[0038] The electrolyzer in the water electrolysis hydrogen production system (primary water electrolysis hydrogen production module 6, secondary water electrolysis hydrogen production module 7, tertiary water electrolysis hydrogen production module 8) preferably adopts a PEM type electrolyzer that is suitable for volatility, safety, and high pressure. It is a proton exchange membrane (PEM) electrolyzer, and the hydrogen production capacity of a single tank is usually 500~1000NM 3 / h (2.5MW~5MW). To ensure external transmission, a high-pressure electrolyzer system is generally used to produce hydrogen. The pressure is generally 3.0MPa~6MPa, and the power consumption of the electrolyzer is 4.0~5.0kWh / NM 3 , and can operate normally between 10% and 120% of its rated power.
[0039] The installed capacity of the primary electrolyzer is usually matched with the power generation of wind and solar resources. The appropriate electrolyzer scale and hydrogen output are selected. In this example, 32 2.5MW~5MW electrolyzers are installed. Each 2.5MW electrolyzer system has a hydrogen production capacity of 500NM 3 / h, can be composed of two 1.25MW stacks or one 2MW stack, each 5MW electrolyzer system has a hydrogen production capacity of 1000NM 3 / h, can be composed of two 2.5MW stacks or one 5MW stack. When the installed capacity is 80MW, 32 2.5MW electrolyzers are used, with a hydrogen production capacity of 16,000NM 3 / h, using 32 5MW electrolyzers, the raw water consumption is 16000Kg / h; when the installed capacity is 160MW, the hydrogen production capacity is 32000NM 3 / h, and the raw water consumption is 32000Kg / h. The hydrogen storage module 9 in this example uses a hydrogen storage tank to meet the external transmission requirements.
[0040] The pure water from the output end of the pure water storage module 12 is connected to the primary water electrolysis hydrogen production module 6. Under the action of electricity, the PEM electrolyzer decomposes water into hydrogen and oxygen. The water-gas separation unit on the anode side of the electrolyzer separates oxygen. During the electrolysis process, due to the difference in the ionization and separation of protium and deuterium, deuterium is concentrated in the electrolyte. The separated water with concentrated deuterium enters the circulating raw water. After a period of electrolysis and circulation, it is concentrated to form a balanced deuterium-containing concentrated water. According to the PEM electrolyzer catalyst type Pt, Ir, etc., operating conditions, current density (0.5~3A / cm 2 ), temperature (40~70℃), etc., the deuterium content of heavy water is about 0.030~0.120%. The specific experimental conditions are as follows: at a current density of 1A / cm 2 , temperature 50℃, operation for 1000 hours, the deuterium content of heavy water is about 0.07%.
[0041] The balanced deuterium-containing concentrated water produced by the primary water electrolysis hydrogen production module 6 continuously enters the raw material buffer of the secondary water electrolysis hydrogen production module 7 through buffer separation, and electrolysis hydrogen is produced in the secondary water electrolysis hydrogen production module 7. The secondary concentrated water electrolysis device adopts the same type of PEM electrolyzer 500~1000NM 3 / h (2.5MW~5MW), the installed capacity is 4~8 sets, the generated hydrogen enters the hydrogen storage module 9, and at the same time produces a higher concentration of balanced deuterium-containing concentrated water, according to the PEM electrolyzer catalyst type Pt, Ir, etc., operating conditions current density (0.5~3A / cm 2 ), temperature (40~70℃), etc., the deuterium content of heavy water is about 0.070~0.96%. The specific experimental conditions are as follows: at a current density of 1A / cm 2 , temperature 50℃, operation for 1000 hours, the deuterium content of heavy water is about 0.5%.
[0042] The balanced deuterium-containing concentrated water produced by the secondary water electrolysis hydrogen production module 7 continuously enters the raw material buffer of the tertiary water electrolysis hydrogen production module 8, and electrolysis hydrogen is produced in the tertiary water electrolysis hydrogen production module 8. At the same time, after continuous three-stage electrolysis, the balanced deuterium-containing concentrated water can enter the storage tank as a heavy water raw material product for shipment. The deuterium content of heavy water is about 0.30~5.00%. The three-stage concentrated water electrolysis device uses the same type of PEM electrolyzer 500~1000NM 3 / h (2.5MW~5MW), the installed capacity is 1~2 sets.
[0043] The energy storage system module 2 sets the energy storage scale according to the 20% low load of the water electrolysis system, and increases the energy storage capacity to extend the supply of the water electrolysis energy management system 4 as much as possible during the time when the wind and photovoltaic power are low, thereby improving the quality of the power grid and the efficiency of resource utilization.
[0044] The heavy water raw material product leaves the factory or directly enters the heavy water distillation system to obtain high-concentration heavy water, or enters the electrolytic catalytic exchange CECE system to obtain high-concentration heavy water. The high-concentration heavy water can be shipped as a commodity.
[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A continuous large-scale wind-solar power generation electrolysis water hydrogen production and heavy water co-production system, characterized in that it include: Wind power generation and / or photovoltaic power generation module, power collection access module, transformer and rectifier AC-DC module, water pretreatment and purification device module, primary water hydrogen production module, secondary water electrolysis hydrogen production module, tertiary water electrolysis hydrogen production module, hydrogen storage module, concentrated heavy water product storage module; The wind power generation and / or photovoltaic power generation module is connected to the power collection access module through a cable, and the output end of the power collection access module is connected to the transformer and rectifier AC-DC module; the output end of the transformer and rectifier AC-DC module is connected to the primary water hydrogen production module, the secondary water electrolysis hydrogen production module and the tertiary water electrolysis hydrogen production module in sequence; The water pretreatment and purification device module is connected to the primary water hydrogen production module through the pure water storage module, the output end of the primary water hydrogen production module is connected to the hydrogen storage module, and the output end of the tertiary water electrolysis hydrogen production module is connected to the concentrated heavy water product storage module.
2. The continuous large-scale wind-solar power generation, water electrolysis, hydrogen production and heavy water co-production system according to claim 1 is characterized in that: The output end of the wind power generation and / or photovoltaic power generation module is connected to the electric energy storage system module to store the excess electricity generated by the wind power generation and / or photovoltaic power generation module.
3. The continuous large-scale wind-solar power generation, water electrolysis, hydrogen production and heavy water co-production system according to claim 1 or 2, characterized in that: The continuous large-scale wind-solar power generation water electrolysis hydrogen production and heavy water co-production system also includes a water electrolysis energy management system module; The water electrolysis energy management system module is connected to the transformer and rectifier AC-DC module, and is used to manage system power to supply the primary water electrolysis hydrogen production module, the secondary water electrolysis hydrogen production module and the tertiary water electrolysis hydrogen production module, and other AC output power is provided to other users of the system.
4. The continuous large-scale wind-solar power generation water electrolysis hydrogen production and heavy water co-production system according to any one of claims 1-3, characterized in that: The primary water hydrogen production module, the secondary water electrolysis hydrogen production module, and the tertiary water electrolysis hydrogen production module are all provided with PEM water electrolysis hydrogen production equipment containing a proton exchange membrane.
5. A method for generating electricity, electrolyzing water, producing hydrogen and producing heavy water by using the continuous large-scale wind-solar power generation, electrolyzing water, producing hydrogen and producing heavy water system according to any one of claims 1 to 4, comprising the following steps: 1) The wind power generation and / or photovoltaic power generation module is used to generate electricity from wind and light, and the generated electricity is connected to the power collection access module through a cable. The output end of the power collection access module is connected to the transformer and rectifier AC-DC module to transform and rectify the electricity; 2) Treating and purifying water through the water pretreatment and purification device module to obtain pure water, and the pure water enters the pure water storage module. The output end of the pure water storage module connects the pure water to the primary water electrolysis hydrogen production module. Under the action of the power output by the transformer and the rectifier AC-DC module, the electrolyzed water is decomposed into hydrogen and oxygen, and the water electrolysis produces balanced deuterium-containing concentrated water; the balanced deuterium-containing concentrated water enters the secondary water electrolysis hydrogen production module for electrolysis hydrogen production, and at the same time produces balanced deuterium-containing concentrated water, and then enters the tertiary water electrolysis hydrogen production module for electrolysis hydrogen production to obtain heavy water, which is recovered to the concentrated heavy water product storage module; The hydrogen generated above enters the hydrogen storage module for storage and is exported to hydrogen users for use.
6. The method according to claim 5, characterized in that The electricity generated in step 1) is electrolyzed into water in step 2), and the excess electricity is stored in the electric energy storage system module.
7. The method according to claim 5 or 6, characterized in that: In the method described, the water electrolysis energy management system module manages the power output by the transformer and rectifier AC-DC module to supply the primary water electrolysis hydrogen production module, the secondary water electrolysis hydrogen production module and the tertiary water electrolysis hydrogen production module, and other AC output power is provided to other users of the system.
8. The method according to any one of claims 5 to 7, characterized in that: In step 2), the primary water hydrogen production module, the secondary water electrolysis hydrogen production module, and the tertiary water electrolysis hydrogen production module all use the PEM water electrolysis hydrogen production method to electrolyze water to produce hydrogen.
9. The method according to claim 8, characterized in that The current density used in the PEM water electrolysis hydrogen production method is 0.5~3A / cm 2 , the temperature is 40~70℃.