A cold electricity and dilution integrated jetting type circulating system for hydrogen production waste heat recovery of a high-salinity wastewater electrolytic cell

Abstract

The application discloses a cold-electricity-freshwater integrated jetting type circulating system for hydrogen production waste heat recovery of high-salinity wastewater electrolytic cell. The system comprises a solar energy coupled high-salinity wastewater electrolysis hydrogen production heat collection module and an electricity production module. The solar energy coupled high-salinity wastewater electrolysis hydrogen production heat collection module comprises the following components: solar energy, a high-salinity wastewater electrolytic cell, a heat conducting oil pump and a heat storage tank. The electricity production module comprises the following components: a steam generator, an expander, a generator, a first ejector, a freshwater condenser, a freshwater pump, a preheater, a freshwater collection tank, a gravity high-salinity wastewater tank and a high-salinity wastewater collection tank. The system fully utilizes renewable green energy solar energy, takes the ejector as the hub of the connecting system, and completes the integrated production of cold energy, electric energy and freshwater through the cooperation of the four modules. Therefore, the system has the advantages of being clean, efficient, high in space utilization, low in cost and high in output.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production by electrolysis of high-salt wastewater, and more particularly to an integrated cold-electricity-desalination spray-type circulating system for recovering waste heat from hydrogen production in a high-salt wastewater electrolyzer. Background Technology

[0002] my country's chemical industrial parks currently generate large amounts of high-salinity wastewater year-round, and the treatment and disposal of this wastewater presents challenges. Technologies such as multi-stage flash evaporation are energy-intensive and not the optimal solution in the long run.

[0003] This application is submitted in order to address the above issues. Summary of the Invention

[0004] To address this issue, this invention proposes an integrated cold-electricity-desalination jet-type circulating system for recovering waste heat from hydrogen production in high-salt wastewater electrolyzers. This system can utilize the abundant solar energy resources in Northwest China to power the high-salt wastewater electrolyzers and use the waste heat from the gas production process in the electrolyzers as a heat source. It effectively integrates the production of cold, electricity, and desalination resources while reducing the need for salt recovery equipment. This provides a feasible solution to the problem of multi-resource co-production in the Northwest chemical industry region.

[0005] This invention provides an integrated jet-type circulating system for hydrogen production from high-salt wastewater electrolysis cells, which integrates cooling, power generation, and desalination. The system consists of a solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module, a power generation module, a desalination separation module, and a refrigeration module.

[0006] The components and connections are as follows:

[0007] The solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module includes solar energy, a high-salt wastewater hydrogen production electrolysis cell, a high-salt wastewater waste heat recovery device, a waste heat recovery collector, a heat transfer oil pump, and a heat storage tank. The high-salt wastewater hydrogen production waste heat recovery collector, the heat transfer oil pump, and the heat storage tank are connected by heat transfer oil pipelines.

[0008] The high-salt wastewater electrolyzer utilizes solar energy as the power source for hydrogen production, efficiently using solar power to generate hydrogen and heat. The outlet of the waste heat recovery collector is connected to the inlet of the heat storage tank, and the outlet of the heat storage tank is connected to the inlet of the heat transfer oil pump. The outlet of the heat transfer oil pump enters the steam generator through the heat transfer oil pipeline and is finally connected to the inlet of the waste heat recovery collector, thus forming a closed loop of the waste heat recovery collection module for hydrogen production in the high-salt wastewater electrolyzer.

[0009] The waste heat recovery module for hydrogen production from high-salt wastewater electrolyzers uses heat transfer oil as a medium to convert waste heat from the electrolyzers into thermal energy, which serves as the heat source for the power generation module. The power generation module includes a steam generator, expander, generator, first ejector, freshwater condenser, freshwater pump, preheater, freshwater collection tank, gravity high-salt wastewater tank, and high-salt wastewater collection tank. The outlet of the gravity-fed high-salt wastewater tank is connected to the inlet of the cold water pipe of the freshwater condenser, and the cold water pipe outlet is divided into two parts: one part flows into the high-salt wastewater collection tank, and the other part enters the high-salt wastewater evaporation tank of the freshwater separation module; the lower outlet of the freshwater condenser is connected to the inlet of the freshwater collection tank, and the upper outlet of the freshwater condenser is connected to the inlet of the freshwater pump; the outlet of the freshwater pump is connected to the inlet of the cold fluid pipeline of the preheater, the outlet of the cold fluid pipeline of the preheater is connected to the inlet of the circulating working fluid pipeline of the steam generator, and the outlet of the circulating working fluid pipeline of the steam generator is connected to the inlet of the expander; the expander is directly connected to the generator through a rotating shaft, the middle exhaust port of the expander is connected to the working fluid inlet of the first ejector, and the outlet of the expander is connected to the inlet of the hot fluid pipeline of the preheater; the outlet of the hot fluid pipeline of the preheater and the nozzle outlet of the first ejector are both connected to the steam inlet of the freshwater condenser, thus forming a closed loop of the power generation module with freshwater as the circulating working fluid.

[0010] The desalination separation module includes a first ejector, a high-salt wastewater evaporation tank, and a concentrated high-salt wastewater collection tank. The ejector fluid inlet of the first ejector is connected to the water vapor outlet at the top of the high-salt wastewater evaporation tank. The high-salt wastewater inlet of the high-salt wastewater evaporation tank is connected to a branch of the cold water pipe outlet of the desalination condenser of the power generation module. The concentrated high-salt wastewater outlet at the bottom of the high-salt wastewater evaporation tank is connected to the inlet of the high-salt wastewater collection tank. The refrigerant-side outlet of the high-salt wastewater evaporation tank is connected to the throttle valve inlet and the refrigerant pump inlet of the refrigeration module, respectively. The refrigerant-side inlet of the high-salt wastewater evaporation tank is connected to the nozzle outlet of the second ejector of the refrigeration module.

[0011] The refrigeration module includes a throttling valve, a refrigeration evaporator, a compressor, a second ejector, a high-salt wastewater evaporation tank, and a refrigerant pump. The inlet of the throttling valve and the inlet of the refrigerant pump are both connected to the refrigerant-side outlet of the high-salt wastewater evaporation tank. The outlet of the refrigerant pump is connected to the working fluid inlet of the second ejector, and the nozzle outlet of the second ejector is connected to the refrigerant-side inlet of the high-salt wastewater evaporation tank. The outlet of the throttling valve is connected to the working fluid inlet of the refrigeration evaporator, the working fluid outlet of the refrigeration evaporator is connected to the compressor inlet, and the compressor outlet is connected to the ejector fluid inlet of the second ejector. This forms a closed loop of the refrigeration module with refrigerant as the circulating working fluid.

[0012] Based on the above structural relationships, the solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module, power generation module, desalination separation module, and refrigeration module are structurally coordinated to form the integrated cold-electricity-desalination jet circulation system for high-salt wastewater wastewater waste heat recovery powered by solar energy provided by this invention.

[0013] The working principle of this invention is as follows:

[0014] The present invention provides an integrated jet-type circulating system for hydrogen production waste heat recovery from high-salt wastewater electrolysis, comprising a solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module, a power generation module, a desalination and salt separation module, and a refrigeration module. The solar module captures solar energy during the day, and the high-salt wastewater electrolysis cell utilizes solar energy as a source of electricity for hydrogen production. The waste heat from hydrogen production in the high-salt wastewater electrolysis cell is recovered and converted into heat energy for heat transfer oil, which is stored in a heat storage tank for later use. The heat transfer oil is pumped from the heat storage tank by a heat transfer oil pump and flows into the steam generator of the power generation module as a heat source for heat release. The cooled heat transfer oil flows back to the waste heat recovery heat collection unit.

[0015] The power generation module uses fresh water as the circulating working fluid. Cold fresh water is drawn from the fresh water condenser and pressurized by a fresh water pump. After preheating in a preheater, it flows into a steam generator for further heat absorption and evaporation to form saturated steam. The saturated steam enters an expander, expands, and performs work, driving a generator to produce electricity via a rotating shaft. The steam entering the expander splits into two parts. One part separates during the work process and acts as the working fluid, entering the first ejector to entrain the steam from the high-salt wastewater evaporation tank. The steam ejected from the nozzle of the first ejector enters the fresh water condenser and condenses to form fresh water. The other part completely performs work, becoming exhaust gas, but still retaining some heat. This exhaust gas enters the hot fluid pipeline of the preheater as a heat source to preheat the cold fresh water. This hot exhaust gas process is exothermic; the cold fresh water in the cold fluid pipeline of the preheater acts as a cold source to pre-condense the hot exhaust gas before it enters the fresh water condenser for final condensation. The high-salt wastewater from the gravity high-salt wastewater tank enters the fresh water condenser through a separate cold water pipe, acting as a cold source to condense the steam. The volume of freshwater in the freshwater condenser is maintained at a constant value, while newly generated freshwater flows into the freshwater collection tank through the lower outlet.

[0016] The desalination separation module serves as the connecting hub between the power generation module and the refrigeration module. Within this module, the high-salt wastewater evaporation tank can both condense the refrigerant from the refrigeration module and evaporate high-salt wastewater for the desalination separation module. First, the refrigerant is ejected from the nozzle of the second ejector of the refrigeration module and enters the refrigerant side of the high-salt wastewater evaporation tank. The refrigerant, possessing a certain amount of heat, acts as a heat source to heat and evaporate the high-salt wastewater. The high-salt wastewater in the evaporation tank originates from preheated high-salt wastewater in the desalination condenser. Due to the suction effect of the first ejector, a negative pressure space is formed on the water vapor side of the high-salt wastewater evaporation tank, accelerating the evaporation of the high-salt wastewater and the condensation of the refrigerant. Simultaneously, the negative pressure space and gravity replenish the high-salt wastewater from the gravity high-salt wastewater tank into the evaporation tank. The water vapor generated by evaporation is injected by the first ejector into the fresh water condenser and condensed to produce fresh water. As the concentration of high-salt wastewater increases due to evaporation, the final concentrated high-salt wastewater is collected from the bottom of the high-salt wastewater evaporation tank and stored in the concentrated high-salt wastewater collection tank. It can then be used as a raw material for salt production. At this point, the fresh salt separation process is completed.

[0017] In the refrigeration module, the refrigerant cooled by the high-salt wastewater evaporation tank is divided into two parts. One part is pressurized by the refrigerant pump and becomes the working fluid of the second ejector; the other part is depressurized by the enthalpy reduction valve to become a low-pressure, low-temperature refrigerant, which then evaporates and absorbs heat in the refrigeration evaporator. The compressor then performs a first-stage compression and pressurization, and the refrigerant is then used as the ejector fluid to enter the second ejector, where it is ejected for a second-stage pressurization to the condensing pressure. Using the second ejector for two-stage pressurization helps reduce compressor power consumption and lowers the overall system energy consumption. Finally, the refrigerant vapor returns to the high-salt wastewater evaporation tank for condensation. Thus, the system of this invention, through the cooperation of four modules, completes an integrated cooling, power, and desalination production system assisted by solar energy.

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

[0019] This invention provides an integrated cold-electricity-desalination jet-type circulating system for a solar-powered high-salinity wastewater electrolyzer hydrogen production waste heat recovery device. Based on fully utilizing renewable green energy such as solar power, the system uses the jet as the hub connecting the four modules to achieve integrated production of cold energy, electrical energy, and fresh water. Therefore, this system has advantages such as cleanliness, high efficiency, high space utilization, low cost, and high output. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0021] The attached diagrams are described as follows: 1-1, Steam generator; 1-2, Expander; 1-3, Generator; 1-4, First ejector; 1-5, Freshwater condenser; 1-6, Freshwater pump; 1-7, Preheater; 1-8, Freshwater collection tank; 1-9, Gravity high-salt wastewater tank; 1-10, High-salt wastewater collection tank; 2-1, Throttling valve; 2-2, Refrigeration evaporator; 2-3, Compressor; 2-4, Second ejector; 2-5, High-salt wastewater evaporation tank; 2-6, Concentrated high-salt wastewater collection tank; 2-7, Refrigerant pump; 3-1, Solar energy; 3-2, High-salt wastewater electrolysis cell; 3-3, Heat storage tank; 3-4, Thermal oil pump. Detailed Implementation

[0022] The present application will now be described in further detail with reference to the embodiments.

[0023] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of this application. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with the techniques or conditions described in the literature in the field or according to the product manual. Materials or equipment whose manufacturers are not specified are all conventional products that can be obtained by purchase.

[0024] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. In the description of this application, unless otherwise stated, “a plurality” means two or more. It should be further understood that the term “comprising” as used in the specification of this application means the presence of the stated feature, integer, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” to another element, it can be directly connected to the other element, or there may be an intermediate element. Furthermore, the term “connected” as used herein can include wireless connections.

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0031] The following is combined with Figure 1 A specific embodiment of the present invention is further described below:

[0032] This invention provides a solar-powered, high-salt wastewater electrolysis hydrogen production waste heat recovery integrated cooling, power and desalination jet-type circulating system. The system consists of a solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module, a power generation module, a desalination separation module and a refrigeration module.

[0033] The solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module includes a solar cell 3-1, a high-salt wastewater electrolysis cell 3-2, a heat transfer oil pump 3-4, and a heat storage tank 3-3, wherein the high-salt wastewater electrolysis cell 3-2, the heat transfer oil pump 3-4, and the heat storage tank 3-3 are connected by heat transfer oil pipelines.

[0034] The high-salt wastewater electrolyzer 3-2 utilizes solar energy 3-1 for electrolysis and generates waste heat. The outlet of the high-salt wastewater electrolyzer 3-2 is connected to the inlet of the heat storage tank 3-3, and the outlet of the heat storage tank 3-3 is connected to the inlet of the heat transfer oil pump 3-4. The outlet of the heat transfer oil pump 3-4 enters the steam generator 1-1 through a heat transfer oil pipeline and ultimately connects to the inlet of the high-salt wastewater electrolyzer 3-2, thus forming a closed loop of solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module. The solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module uses heat transfer oil as a medium to convert solar energy into heat energy, which serves as the heat source for the steam generator 1-1 of the power generation module.

[0035] The power generation module includes: steam generator 1-1, expander 1-2, generator 1-3, first ejector 1-4, freshwater condenser 1-5, freshwater pump 1-6, preheater 1-7, freshwater collection tank 1-8, gravity high-salt wastewater tank 1-9, and high-salt wastewater collection tank 1-10.

[0036] The outlet of gravity high-salt wastewater tank 1-9 is connected to the inlet of the cold water pipe of freshwater condenser 1-5, and the water is divided into two parts at the outlet of the cold water pipe of freshwater condenser 1-5. One part flows into high-salt wastewater collection tank 1-10, and the other part enters the high-salt wastewater evaporation tank 2-5 of the freshwater separation module. The lower outlet of freshwater condenser 1-5 is connected to the inlet of freshwater collection tank 1-8, and the upper outlet of freshwater condenser 1-5 is connected to the inlet of freshwater pump 1-6. The outlet of freshwater pump 1-6 is connected to the inlet of the cold fluid pipeline of preheater 1-7, and the outlet of the cold fluid pipeline of preheater 1-7 is connected to... The inlet of the circulating working fluid water pipe of the steam generator 1-1 is connected, and the outlet of the circulating working fluid water pipe of the steam generator 1-1 is connected to the inlet of the expander 1-2. The expander 1-2 is directly connected to the generator 1-3 through a rotating shaft. The exhaust port in the middle of the expander 1-2 is connected to the working fluid inlet of the first injector 1-4. The outlet of the expander 1-2 is connected to the hot fluid pipeline inlet of the preheater 1-7. The hot fluid pipeline outlet of the preheater 1-7 and the nozzle outlet of the first injector 1-4 are both connected to the steam inlet of the fresh water condenser 1-5, thus forming a closed loop of the power generation module with fresh water as the circulating working fluid.

[0037] The salt separation module includes: a first ejector 1-4, a high-salt wastewater evaporation tank 2-5, and a concentrated high-salt wastewater collection tank 2-6. The ejector fluid inlet of the first ejector 1-4 is connected to the water vapor outlet at the top of the high-salt wastewater evaporation tank 2-5. The high-salt wastewater inlet of the high-salt wastewater evaporation tank 2-5 is connected to a branch of the cold water pipe outlet of the freshwater condenser 1-5 of the power generation module. The concentrated high-salt wastewater outlet at the bottom of the high-salt wastewater evaporation tank 2-5 is connected to the inlet of the concentrated high-salt wastewater collection tank 2-6. The refrigerant-side outlet of the high-salt wastewater evaporation tank 2-5 is connected to the inlet of the throttle valve 2-1 and the inlet of the refrigerant pump 2-7 of the refrigeration module, respectively. The refrigerant-side inlet of the high-salt wastewater evaporation tank 2-5 is connected to the nozzle outlet of the second ejector 2-4 of the refrigeration module.

[0038] The refrigeration module includes: a throttle valve 2-1, a refrigeration evaporator 2-2, a compressor 2-3, a second ejector 2-4, a high-salt wastewater evaporation tank 2-5, and a refrigerant pump 2-7. The inlet of the throttle valve 2-1 and the inlet of the refrigerant pump 2-7 are both connected to the refrigerant-side outlet of the high-salt wastewater evaporation tank 2-5. The outlet of the refrigerant pump 2-7 is connected to the working fluid inlet of the second ejector 2-4, and the nozzle outlet of the second ejector 2-4 is connected to the refrigerant-side inlet of the high-salt wastewater evaporation tank 2-5. The outlet of the throttle valve 2-1 is connected to the working fluid inlet of the refrigeration evaporator 2-2, the working fluid outlet of the refrigeration evaporator 2-2 is connected to the inlet of the compressor 2-3, and the outlet of the compressor 2-3 is connected to the ejector fluid inlet of the second ejector 2-4. This forms a closed loop of the refrigeration module with refrigerant as the circulating working fluid.

[0039] Based on the above structural relationships, the solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module, power generation module, desalination separation module, and refrigeration module are structurally coordinated to form the integrated cold-electricity-desalination jet circulation system for hydrogen production waste heat recovery from solar-powered high-salt wastewater electrolysis cells provided by this invention.

[0040] The working principle of the system of this invention is as follows:

[0041] The present invention provides an integrated jet-type circulating system for hydrogen production from high-salt wastewater electrolysis, comprising a solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module, an electricity generation module, a desalination separation module, and a refrigeration module.

[0042] The high-salt wastewater electrolysis cell 3-2 of the solar thermal collector module uses solar energy 3-1 to power electrolysis and generate waste heat, which is converted into the heat energy of the heat transfer oil. The heat transfer oil carrying the heat energy is then stored in the heat storage tank 3-3 for later use.

[0043] The heat transfer oil is drawn from the heat storage tank 3-3 by the heat transfer oil pump 3-4 and enters the steam generator 1-1 of the power generation module to release heat as a heat source. After cooling, the heat transfer oil flows out of the steam generator 1-1 and returns to the high-salt wastewater electrolysis cell 3-2.

[0044] The power generation module uses fresh water as the circulating working fluid. Cold fresh water is drawn from the fresh water condenser 1-5 by the fresh water pump 1-6 and pressurized. After being preheated by the preheater 1-7, it flows into the steam generator 1-1 for further heat absorption and evaporation to form saturated steam. The saturated steam enters the expander 1-2 to expand and do work, and drives the generator 1-3 to generate electricity through the rotating shaft. The steam entering the expander 1-2 is divided into two parts. One part is separated during the work process and enters the first ejector 1-4 as the working fluid to entrain the steam in the high-salt wastewater evaporation tank 2-5. The steam ejected from the nozzle outlet of the first ejector 1-4 enters the fresh water condenser 1-5 to condense and generate fresh water. The other part is completely used for work and becomes exhaust gas, but still has a certain amount of heat. This is hot exhaust gas, which enters the hot fluid pipeline of the preheater 1-7 as a heat source to preheat the cold fresh water. During this exothermic process, the hot exhaust gas is pre-condensed by the cold fresh water in the cold fluid pipeline of preheater 1-7, which then enters the fresh water condenser 1-5 for final condensation. The high-salinity wastewater from gravity high-salinity wastewater tank 1-9 enters the fresh water condenser 1-5 through a separate cold water pipe, serving as a cold source to condense water vapor. The volume of fresh water in the fresh water condenser 1-5 is maintained at a constant value, while newly generated fresh water flows through the lower outlet into the fresh water collection tank 1-8.

[0045] The salt separation module serves as the connecting hub between the power generation module and the refrigeration module. Within the salt separation module, the high-salt wastewater evaporation tank 2-5 can both condense the refrigerant from the refrigeration module and evaporate high-salt wastewater for the salt separation module.

[0046] First, the refrigerant is ejected from the nozzle outlet of the second ejector 2-4 of the refrigeration module and enters the refrigerant side of the high-salt wastewater evaporation tank 2-5. The refrigerant, with a certain amount of heat, acts as a heat source to heat the high-salt wastewater and cause it to evaporate. The high-salt wastewater in the high-salt wastewater evaporation tank 2-5 comes from the high-salt wastewater preheated by the freshwater condenser 1-5. Due to the suction effect of the first ejector 1-4, a negative pressure space is formed on the water vapor side of the high-salt wastewater evaporation tank 2-5, which accelerates the evaporation of the high-salt wastewater and the condensation of the refrigerant. At the same time, the negative pressure space and gravity replenish the high-salt wastewater from the gravity high-salt wastewater tank 1-9 into the high-salt wastewater evaporation tank 2-5. The water vapor generated by the evaporation of high-salt wastewater in the high-salt wastewater evaporation tank 2-5 is injected by the first ejector 1-4 to the freshwater condenser 1-5 and condensed to generate freshwater. As the concentration of high-salt wastewater continuously increases due to evaporation, the final concentrated high-salt wastewater is collected from the bottom of the high-salt wastewater evaporation tank 2-5 and stored in the concentrated high-salt wastewater collection tank 2-6, which can be used as a raw material for salt production. At this point, the freshwater separation process is completed.

[0047] In the refrigeration module, the refrigerant cooled by the high-salt wastewater evaporation tank 2-5 is divided into two parts. One part is pressurized by the refrigerant pump 2-7 and becomes the working fluid of the second ejector 2-4. The other part is depressurized by the throttling valve 2-1 to become a low-pressure, low-temperature refrigerant, which then evaporates and absorbs heat in the refrigeration evaporator 2-2. The compressor 2-3 then performs the first stage of compression and pressurization, and the refrigerant is then used as the ejector fluid to enter the second ejector 2-4, where it is ejected for a second stage of pressurization to the condensing pressure. Using the second ejector 2-4 for two-stage pressurization helps reduce the power consumption of the compressor 2-3 and lowers the overall system energy consumption. Finally, the refrigerant vapor returns to the high-salt wastewater evaporation tank 2-5 for condensation.

[0048] Thus, the system of the present invention has completed the integrated cold-power-desalination production of hydrogen produced by a high-salt wastewater electrolyzer powered by solar energy and with waste heat recovery through the cooperation of four modules.

Claims

1. A jet-type circulating system for integrated cooling, power generation, and desalination of hydrogen produced from high-salt wastewater electrolyzers, characterized in that, The system includes: a solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module, a power generation module, and a desalination separation module; The solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module includes the following components: solar energy (3-1), high-salt wastewater electrolysis cell (3-2), heat transfer oil pump (3-4), and heat storage tank (3-3). The above-mentioned power generation module includes the following components: steam generator (1-1), expander (1-2), generator (1-3), first ejector (1-4), fresh water condenser (1-5), fresh water pump (1-6), preheater (1-7), fresh water collection tank (1-8), gravity high-salt wastewater tank (1-9) and high-salt wastewater collection tank (1-10); The connection relationships of the components of the solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module and power generation module are as follows: The high-salt wastewater electrolytic cell (3-2), the heat transfer oil pump (3-4), and the heat storage tank (3-3) are connected by heat transfer oil pipelines; The high-salt wastewater electrolyzer (3-2) is configured to: utilize solar energy (3-1) to power electrolysis and generate waste heat; the outlet of the high-salt wastewater electrolyzer (3-2) is connected to the inlet of the heat storage tank (3-3), the outlet of the heat storage tank (3-3) is connected to the inlet of the heat transfer oil pump (3-4), and the outlet of the heat transfer oil pump (3-4) enters the steam generator (1-1) through the heat transfer oil pipeline and is finally connected to the inlet of the high-salt wastewater electrolyzer (3-2), thus forming a closed loop of solar energy coupled with the high-salt wastewater electrolysis hydrogen production heat collection module; The outlet of the gravity high-salt wastewater tank (1-9) is connected to the inlet of the cold water pipe of the freshwater condenser (1-5), and splits into two parts at the outlet of the cold water pipe of the freshwater condenser (1-5). One part flows into the high-salt wastewater collection tank (1-10), and the other part enters the high-salt wastewater evaporation tank (2-5) of the freshwater separation module. The lower outlet of the freshwater condenser (1-5) is connected to the inlet of the freshwater collection tank (1-8), and the upper outlet of the freshwater condenser (1-5) is connected to the inlet of the freshwater pump (1-6). The outlet of the freshwater pump (1-6) is connected to the inlet of the cold fluid pipeline of the preheater (1-7), and the outlet of the cold fluid pipeline of the preheater (1-7) is connected to... The steam generator (1-1) is connected to the inlet of the circulating working fluid water pipe, and the outlet of the steam generator (1-1) is connected to the inlet of the expander (1-2). The expander (1-2) is directly connected to the generator (1-3) through a rotating shaft. The exhaust port in the middle of the expander (1-2) is connected to the working fluid inlet of the first injector (1-4), and the outlet of the expander (1-2) is connected to the hot fluid pipeline inlet of the preheater (1-7). The hot fluid pipeline outlet of the preheater (1-7) and the nozzle outlet of the first injector (1-4) are both connected to the steam inlet of the fresh water condenser (1-5), thus forming a closed loop of the power generation module with fresh water as the circulating working fluid. The system also includes the following components: a high-salt wastewater evaporation tank (2-5), a concentrated high-salt wastewater collection tank (2-6), a throttle valve (2-1), a refrigeration evaporator (2-2), a compressor (2-3), a second ejector (2-4), a high-salt wastewater evaporation tank (2-5), and a refrigerant pump (2-7). The first injector (1-4), the high-salt wastewater evaporation tank (2-5), and the concentrated high-salt wastewater collection tank (2-6) form a desalination module; the throttle valve (2-1), the refrigeration evaporator (2-2), the compressor (2-3), the second injector (2-4), the high-salt wastewater evaporation tank (2-5), and the refrigerant pump (2-7) form a refrigeration module. The connection relationships of each component are as follows: The ejector fluid inlet of the first ejector (1-4) is connected to the water vapor outlet at the top of the high-salt wastewater evaporation tank (2-5). The high-salt wastewater inlet of the high-salt wastewater evaporation tank (2-5) is connected to a branch of the cold water pipe outlet of the fresh water condenser (1-5) of the power generation module. The concentrated high-salt wastewater outlet at the bottom of the high-salt wastewater evaporation tank (2-5) is connected to the inlet of the concentrated high-salt wastewater collection tank (2-6). The refrigerant side outlet of the high-salt wastewater evaporation tank (2-5) is connected to the inlet of the throttle valve (2-1) and the inlet of the refrigerant pump (2-7) of the refrigeration module, respectively. The refrigerant side inlet of the high-salt wastewater evaporation tank (2-5) is connected to the nozzle outlet of the second ejector (2-4) of the refrigeration module. The inlet of the throttle valve (2-1) and the inlet of the refrigerant pump (2-7) are both connected to the refrigerant side outlet of the high-salt wastewater evaporation tank (2-5). The outlet of the refrigerant pump (2-7) is connected to the working fluid inlet of the second ejector (2-4), and the nozzle outlet of the second ejector (2-4) is connected to the refrigerant side inlet of the high-salt wastewater evaporation tank (2-5). The outlet of the throttle valve (2-1) is connected to the working fluid inlet of the refrigeration evaporator (2-2), the working fluid outlet of the refrigeration evaporator (2-2) is connected to the inlet of the compressor (2-3), and the outlet of the compressor (2-3) is connected to the ejector fluid inlet of the second ejector (2-4). Thus, a closed loop of the refrigeration module with refrigerant as the circulating working fluid is formed.

2. A method for integrated cold-electricity-desalination spray circulation for waste heat recovery in hydrogen production from high-salt wastewater electrolyzers, characterized in that, The method is performed using the system described in claim 1; The method includes the following steps: The working method of the solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module is as follows: The high-salt wastewater electrolysis cell (3-2) of the solar-coupled high-salt wastewater electrolysis hydrogen production heat collection module utilizes solar energy (3-1) to power electrolysis and generate waste heat, which is converted into heat energy of heat transfer oil. The heat transfer oil carrying the heat energy is stored in the heat storage tank (3-3) for later use. The heat transfer oil is drawn from the heat storage tank (3-3) by the heat transfer oil pump (3-4) and enters the steam generator (1-1) of the power generation module to release heat as a heat source. After cooling, the heat transfer oil flows out of the steam generator (1-1) and returns to the high-salt wastewater electrolysis cell (3-2). The power generation module operates as follows: Fresh water is used as the circulating working fluid. Cold fresh water is drawn from the fresh water condenser (1-5) and pressurized by the fresh water pump (1-6). After preheating by the preheater (1-7), it flows into the steam generator (1-1) for further heat absorption and evaporation to form saturated steam. The saturated steam enters the expander (1-2) to expand and perform work, and drives the generator (1-3) to generate electricity via the rotating shaft. The steam entering the expander (1-2) is divided into two parts. One part of the steam separates during the work process and enters the first ejector (1-4) as the working fluid to guide the steam in the high-salt wastewater evaporation tank (2-5), and is ejected from the nozzle outlet of the first ejector (1-4). Water vapor enters the freshwater condenser (1-5) and condenses to generate freshwater; another part of the water vapor completely does work and becomes hot exhaust gas, which enters the hot fluid pipeline of the preheater (1-7) as a heat source to preheat the cold freshwater; the hot exhaust gas is in an exothermic process at this time, and the cold freshwater in the cold fluid pipeline of the preheater (1-7) acts as a cold source to pre-condense the hot exhaust gas, and then enters the freshwater condenser (1-5) for final condensation; the high-salt wastewater in the gravity high-salt wastewater tank (1-9) enters the freshwater condenser (1-5) through an independent cold water pipe, which acts as a cold source to condense water vapor; the volume of freshwater in the freshwater condenser (1-5) is always maintained at a certain value, while the newly generated freshwater flows to the freshwater collection tank (1-8) through the lower outlet; The working method of the salt separation module is as follows: First, the refrigerant is sprayed out from the nozzle outlet of the second injector (2-4) of the refrigeration module and enters the refrigerant side of the high-salt wastewater evaporation tank (2-5). The refrigerant with a certain amount of heat acts as a heat source to heat the high-salt wastewater in the high-salt wastewater evaporation tank (2-5) and evaporate it. The high-salt wastewater in the high-salt wastewater evaporation tank (2-5) comes from the high-salt wastewater preheated by the freshwater condenser (1-5). Due to the suction effect of the first injector (1-4), a negative pressure space will be formed on the water vapor side of the high-salt wastewater evaporation tank (2-5), which will accelerate the evaporation of the high-salt wastewater and the condensation of the refrigerant, while forming... The negative pressure space and gravity draw new high-salt wastewater from the gravity high-salt wastewater tank (1-9) into the high-salt wastewater evaporation tank (2-5). The water vapor generated by the evaporation of the high-salt wastewater in the high-salt wastewater evaporation tank (2-5) is injected by the first ejector (1-4) into the freshwater condenser (1-5) to condense and generate freshwater. Due to evaporation, the concentration of high-salt wastewater in the high-salt wastewater evaporation tank (2-5) continuously increases. The final concentrated high-salt wastewater is collected from the bottom of the high-salt wastewater evaporation tank (2-5) into the concentrated high-salt wastewater collection tank (2-6) for storage. It can be used as a raw material for salt production. The freshwater separation process is thus completed. The refrigeration module operates as follows: The refrigerant cooled by the high-salt wastewater evaporation tank (2-5) is divided into two parts. One part of the refrigerant is pressurized by the refrigerant pump (2-7) and used as the working fluid of the second ejector (2-4). The other part of the refrigerant is converted into a low-pressure, low-temperature refrigerant through the throttle valve (2-1), and then evaporates and absorbs heat through the refrigeration evaporator (2-2). It is then compressed and pressurized by the compressor (2-3) in the first stage, and then enters the second ejector (2-4) as the ejector fluid. It is then ejected and pressurized in the second stage to the condensing pressure. Using the second ejector (2-4) for the second stage of pressurization helps to reduce the power consumption of the compressor (2-3) and reduce the overall energy consumption of the system. Finally, the refrigerant vapor returns to the high-salt wastewater evaporation tank (2-5) for condensation.

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