Normal-temperature water body heat energy power generation method and seawater resource comprehensive utilization method

Abstract

The invention provides a normal-temperature water body heat energy power generation method and a seawater resource comprehensive utilization method. According to the normal-temperature water body heat energy power generation method, heat in a normal-temperature water body is absorbed according to the evaporation heat absorption principle of a phase change temperature adjusting agent, and a high-temperature and high-pressure working medium is formed after compression of a compressor; and the phase-change temperature regulating agent exchanges heat with thermal carrier water according to the condensation heat release principle to heat the thermal carrier water, and the heated water is input into a boiler to prepare high-temperature and high-pressure water vapor for pushing a steam turbine to generate power. When the method is applied to normal-temperature seawater power generation, seawater desalination and mineral separation can be synchronously achieved, energy circulation and efficient utilization are achieved, the method opens up a new path for human beings to obtain cheap new energy, efficient cyclic utilization of energy and resources can be achieved, waste of energy and resources is reduced, and remarkable economic benefits and environmental benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the field of energy science and technology, and more specifically, to a method for generating electricity using thermal energy from water bodies at room temperature and a method for comprehensively utilizing seawater resources. Background Art

[0002] Traditional hydropower uses the gravitational potential energy of water to generate electricity, which requires a high drop in height, high initial construction costs, and a long construction period. Currently, this resource has been fully utilized by humans, and the potential for further development is very limited.

[0003] Traditional thermal power uses the chemical energy of fuels such as coal, oil or natural gas to generate electricity. The energy conversion efficiency is low and the cost of power generation is very high.

[0004] In recent years, people have generally been optimistic about and concerned about "photovoltaic power generation" because it is a model of direct use of solar energy, which is obvious. However, after years of unremitting efforts, the utilization rate of current photovoltaic power generation technology is still low, and it is difficult to continue to significantly reduce costs. The main reason is that it is restricted by its power generation principle (only part of the instant energy of solar energy is used). The energy density of the instant energy that can be used to generate electricity when sunlight shines in the air is not high.

[0005] Traditional geothermal power generation uses underground high-temperature hot water or steam to generate electricity, which requires a high-temperature geothermal source (>150°C) and is only applicable to areas with rich geothermal resources and limited resources.

[0006] Traditionally, it is believed that when the temperature of thermal energy is close to the ambient temperature, the temperature difference between the thermal energy and the environment is small, so it is difficult to extract the thermal energy, and its working capacity is significantly reduced, and it cannot generate electricity directly. If thermal energy is needed to generate electricity, the temperature must be high. Therefore, in the traditional energy classification, the energy grade is positively correlated with the temperature, and low-temperature thermal energy is often regarded as "waste heat." It is this traditional evaluation system that has caused low-temperature thermal energy to be forgotten and ignored by humans for a long time.

[0007] At the same time, about 97% of the world's water resources exist in the ocean. Seawater contains rich thermal energy and mineral resources. The traditional mode of utilizing marine resources is relatively single, and there is a serious problem of resource waste. The current technical route of utilizing marine resources shows three major divisions: (1) Power generation: The efficiency of common kinetic energy power generation such as tides, ocean currents, and waves is low, and the energy efficiency ratio of temperature difference power generation is also not high.

[0008] (2) Seawater desalination: Reverse osmosis desalination of seawater consumes a lot of energy, and the direct discharge of concentrated brine will pollute the ecological environment.

[0009] (3) Seawater mining: The extraction of salt minerals relies on high-energy-consuming processes.

[0010] Under the background of the "dual carbon" strategy, it is imperative to build a new model for the coordinated development of multiple resources such as ocean energy, water and mining.

[0011] The present invention aims at addressing the deficiencies of the above-mentioned traditional energy and marine resource utilization, and proposes an innovative method for generating electricity from normal-temperature water thermal energy and a method for comprehensive utilization of seawater resources. Summary of the invention

[0012] The purpose of the present invention is to solve the technical problems of traditional energy power generation and marine resource utilization, and to provide a normal temperature water body thermal energy power generation method and a comprehensive utilization method of seawater resources.

[0013] In order to solve the above technical problems, the present invention provides the following technical solutions: The first object of the present invention is to provide a method for generating electricity from water body thermal energy at room temperature. The phase change temperature control agent absorbs heat from the water at room temperature by evaporation heat absorption principle, and then transfers the heat to the heat carrier water by condensation heat release principle to heat it up and use it for power generation.

[0014] Optionally, the method comprises the following steps: S1: Using the principle of heat absorption by evaporation of phase change temperature regulating agent, heat exchange is performed with normal temperature water through heat exchanger A to absorb heat from the normal temperature water; S2: The phase change temperature regulating agent after absorbing heat is transported to the compressor for compression processing to form a high-temperature and high-pressure working fluid; S3: The high-temperature and high-pressure working fluid exchanges heat with the heat carrier water in the heat exchanger B, transferring heat to the heat carrier water to increase its temperature; S4: performing throttling and pressure reduction processing of the phase change temperature regulating agent after the heat exchange is completed by the expansion valve, and then returning to step S1 for circulation; S5: inputting the heated heat carrier water into the boiler to prepare high-temperature and high-pressure steam; S6: Use high-temperature and high-pressure steam to drive the steam turbine generator set to generate electricity and output waste heat hot water; S7: The waste hot water generated in step S6 is transported to the heat exchanger B in step S3 for further heating and recycling.

[0015] Another object of the present invention is to improve a method for comprehensive utilization of seawater resources. While using the thermal energy of normal temperature seawater to generate electricity, it also conducts seawater desalination and mineral extraction, thus achieving energy recycling.

[0016] Optionally, the method comprises the following steps: S1: Using the principle of heat absorption by evaporation of phase change temperature regulating agent, heat exchange is carried out with heat source seawater through heat exchanger A to absorb heat from seawater; S2: The phase change temperature regulating agent after absorbing heat is transported to the compressor for compression processing to form a high-temperature and high-pressure working fluid; S3: The high-temperature and high-pressure working fluid exchanges heat with the mineral seawater in the heat exchanger B, transferring heat to the mineral seawater to increase its temperature; S4: performing throttling and pressure reduction processing of the phase change temperature regulating agent after the heat exchange is completed by the expansion valve, and then returning to step S1 for circulation; S5: The heated mineral seawater is input into the boiler to prepare high-temperature and high-pressure steam, thereby achieving seawater desalination and mineral output simultaneously; S6: Use high-temperature and high-pressure steam to drive the steam turbine generator set to generate electricity and produce waste heat hot water; S7: The waste heat water generated in step S6 is heat exchanged with normal temperature mineral seawater through a heat exchanger C to output normal temperature fresh water; S8: The mineral seawater after the heat exchange in step S7 is transported to the heat exchanger B in step S3 for further heating and recycling.

[0017] Optionally, in step S1, the heat Q1 absorbed by the phase change temperature regulating agent from the heat source seawater is calculated by the following formula: Q1 = m_phase change thermostat × c_phase change thermostat × (T_heat source seawater - T_phase change thermostat initial) Among them, m_phase change thermostat is the mass flow rate of the phase change thermostat, c_phase change thermostat is the specific heat capacity of the phase change thermostat, T_heat source seawater is the temperature of the heat source seawater, and T_phase change thermostatinitial is the initial temperature of the phase change thermostat.

[0018] Optionally, in step S3, the heat Q2 transferred from the high-temperature and high-pressure phase-change temperature regulating agent to the mineral source seawater in the heat exchanger B is expressed as: Q2 = m_phase change temperature regulator × (h_high temperature and high pressure - h_low temperature and low pressure) Among them, h_high temperature and high pressure is the enthalpy value of the high temperature and high pressure phase change thermostat, and h_low temperature and low pressure is the enthalpy value of the phase change thermostat after throttling and pressure reduction by the expansion valve. This heat is equal to the heat absorbed by the mineral source seawater, which increases its temperature.

[0019] Optionally, in step S5, during the process of preparing high-temperature and high-pressure steam by the boiler, the desalination efficiency η_desalination of seawater is estimated by the following formula: η_Desalination = (m_fresh water / m_original seawater) × 100% Among them, m_freshwater is the amount of fresh water produced, and m_raw seawater is the amount of mineral seawater input into the boiler.

[0020] Optionally, in step S6, the power P generated by the steam turbine generator set is calculated by the following formula: P = η_unit × (Q_steam - Q_loss) Among them, η_unit is the efficiency of the steam turbine generator set, Q_steam is the heat of high-temperature and high-pressure steam, and Q_loss is the heat loss in the system.

[0021] In summary, the present invention has the following beneficial effects: This application realizes thermal power generation of normal temperature water or normal temperature seawater through a series of steps such as heat exchanger A, compression, heat exchanger B, expansion valve throttling and pressure reduction. When using seawater for power generation, seawater desalination and mineral extraction can also be achieved at the same time, which not only innovatively utilizes seawater thermal energy to convert into cheap electricity, but also significantly improves the efficiency of seawater desalination, and realizes the effective utilization of mineral resources, so that seawater resources are more fully and effectively utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a method for generating electricity using thermal energy from water at room temperature according to the present invention.

[0023] Figure 2 This is a schematic diagram of a method for comprehensive utilization of seawater resources according to the present invention. DETAILED DESCRIPTION

[0024] 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 new embodiments of the system. 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.

[0025] Example: The first object of the present invention is to provide a method for generating electricity from water body thermal energy at room temperature. The phase change temperature control agent absorbs heat from the water at room temperature by evaporation heat absorption principle, and then transfers the heat to the heat carrier water by condensation heat release principle to heat it up and use it for power generation.

[0026] Optionally, the method comprises the following steps: S1: Using the principle of heat absorption by evaporation of phase change temperature regulating agent, heat exchange is performed with normal temperature water through heat exchanger A to absorb heat from the normal temperature water; S2: The phase change temperature regulating agent after absorbing heat is transported to the compressor for compression processing to form a high-temperature and high-pressure working fluid; S3: The high-temperature and high-pressure working fluid exchanges heat with the heat carrier water in the heat exchanger B, transferring heat to the heat carrier water to increase its temperature; S4: performing throttling and pressure reduction processing of the phase change temperature regulating agent after the heat exchange is completed by the expansion valve, and then returning to step S1 for circulation; S5: inputting the heated heat carrier water into the boiler to prepare high-temperature and high-pressure steam; S6: Use high-temperature and high-pressure steam to drive the steam turbine generator set to generate electricity and output waste heat hot water; S7: The waste hot water generated in step S6 is transported to the heat exchanger B in step S3 for further heating and recycling.

[0027] Another object of the present invention is to improve a method for comprehensive utilization of seawater resources. While using the thermal energy of normal temperature seawater to generate electricity, it also desalinates seawater and extracts minerals, and realizes energy recycling; The method comprises the following steps: S1: Using the principle of heat absorption by evaporation of phase change temperature regulating agent, heat exchange is carried out with heat source seawater through heat exchanger A to absorb heat from seawater; S2: The phase change temperature regulating agent after absorbing heat is transported to the compressor for compression processing to form a high-temperature and high-pressure working fluid; S3: The high-temperature and high-pressure working fluid exchanges heat with the mineral seawater in the heat exchanger B, transferring heat to the mineral seawater to increase its temperature; S4: performing throttling and pressure reduction processing of the phase change temperature regulating agent after the heat exchange is completed by the expansion valve, and then returning to step S1 for circulation; S5: The heated mineral seawater is input into the boiler to prepare high-temperature and high-pressure steam, thereby achieving seawater desalination and mineral output simultaneously; S6: Use high-temperature and high-pressure steam to drive the steam turbine generator set to generate electricity and produce waste heat hot water; S7: The waste heat water generated in step S6 is heat exchanged with normal temperature mineral seawater through a heat exchanger C to output normal temperature fresh water; S8: The mineral seawater after the heat exchange in step S7 is transported to the heat exchanger B in step S3 for further heating and recycling.

[0028] The above-mentioned arrangement covers a comprehensive utilization method of seawater resources in multiple links such as heat exchange, compression, condensation, and expansion valve throttling and pressure reduction. It comprehensively considers all aspects of seawater resource utilization and forms a complete system. Through the heat exchange step, the heat in the heat source seawater is effectively utilized and used in the subsequent mineral source seawater heating, power generation and desalination process, thereby realizing efficient utilization of heat. In the heating process of the mineral source seawater, not only desalination is realized, but also the precipitation of mineral resources is facilitated, which provides the possibility for the effective utilization of mineral resources. The waste heat in the system is further utilized to drive the steam turbine generator set to generate electricity, thereby realizing energy recovery and reuse, improving the economy of the system, improving the efficiency of seawater desalination, and reducing the desalination cost. At the same time, the effective utilization of mineral resources and energy recovery are realized, and the dependence on traditional energy is reduced, which has significant economic and environmental benefits.

[0029] Optionally, in step S1, the heat Q1 absorbed by the phase change temperature regulating agent from the heat source seawater is calculated by the following formula: Q1 = m_phase change thermostat × c_phase change thermostat × (T_heat source seawater - T_phase change thermostat initial) Among them, m_phase change thermostat is the mass flow rate of the phase change thermostat, c_phase change thermostat is the specific heat capacity of the phase change thermostat, T_heat source seawater is the temperature of the heat source seawater, and T_phase change thermostatinitial is the initial temperature of the phase change thermostat.

[0030] By calculating the heat absorbed by the phase change thermostat in step S1 through a specific formula, the amount of heat transferred during the heat exchange process can be accurately controlled to ensure that the phase change thermostat can fully absorb the heat in the heat source seawater. Accurate control helps to optimize the system efficiency, ensure the maximum utilization of the phase change thermostat when absorbing heat, reduce energy loss, and improve the energy efficiency of the entire system.

[0031] Optionally, in step S3, the heat Q2 transferred from the high-temperature and high-pressure phase-change temperature regulating agent to the mineral source seawater in the heat exchanger B is expressed as: Q2 = m_phase change temperature regulator × (h_high temperature and high pressure - h_low temperature and low pressure) Among them, h_high temperature and high pressure is the enthalpy value of the high temperature and high pressure phase change thermostat, and h_low temperature and low pressure is the enthalpy value of the phase change thermostat after throttling and pressure reduction by the expansion valve. This heat is equal to the heat absorbed by the mineral source seawater, which increases its temperature.

[0032] The calculation method of the heat transferred from the high-temperature and high-pressure phase-change temperature regulator to the mineral seawater in the heat exchanger B is clarified, which helps to accurately control the heating process and temperature range of the mineral seawater, ensure the efficiency of seawater desalination and mineral precipitation. By accurately controlling the heating process of the mineral seawater, problems such as decreased desalination efficiency or incomplete mineral precipitation due to excessively high or low temperature can be avoided, thereby ensuring the stable operation of the system.

[0033] Optionally, in step S5, during the process of preparing high-temperature and high-pressure steam by the boiler, the desalination efficiency η_desalination of seawater is estimated by the following formula: η_Desalination = (m_fresh water / m_original seawater) × 100% Among them, m_freshwater is the amount of fresh water produced, and m_raw seawater is the amount of mineral seawater input into the boiler.

[0034] An estimation formula for desalination efficiency is provided, which enables quantitative evaluation of system performance, helps system operators and users to intuitively understand the actual desalination efficiency of the system, and provides a clear direction for system optimization and improvement.

[0035] Optionally, in step S6, the power P generated by the steam turbine generator set is calculated by the following formula: P = η_unit × (Q_steam - Q_loss) Among them, η_unit is the efficiency of the steam turbine generator set, Q_steam is the heat of high-temperature and high-pressure steam, and Q_loss is the heat loss in the system.

[0036] By calculating the power generated by the steam turbine generator set, the energy recovery efficiency of the system can be evaluated, which helps system operators and users understand the energy utilization of the system during actual operation, provides an important reference for the economy and feasibility of the system, and provides a basis for the economic analysis of the system. The economic benefits of the system can be calculated based on parameters such as power generation and cost, providing support for investment decisions. By evaluating the energy recovery efficiency, the energy waste problem in the system can be discovered, and the system can be optimized and improved accordingly to improve the energy utilization efficiency of the system.

[0037] The present application realizes the utilization of thermal energy of normal temperature seawater, the heating and desalination of mineral source seawater, and the utilization and power generation of waste heat through a series of steps. Through the heat exchanger A, the phase change temperature regulating agent exchanges heat with the heat source seawater, absorbs the heat in the heat source seawater, and realizes the initial absorption of heat. The phase change temperature regulating agent after absorbing heat is transported to the compressor for compression treatment to form a high-temperature and high-pressure phase change temperature regulating agent working fluid, which accumulates heat for subsequent heat exchange activities. The high-temperature and high-pressure phase change temperature regulating agent exchanges heat with the mineral source seawater in the heat exchanger B, transfers the heat to the mineral source seawater, causes it to heat up, and provides conditions for power generation, seawater desalination and mineral precipitation. The phase-change temperature regulating agent that has undergone heat exchange is throttled and depressurized by an expansion valve to form a low-temperature and low-pressure phase-change temperature regulating agent, which is then returned to step 1 for circulation. The heated mineral seawater is input into the boiler to prepare high-temperature and high-pressure steam, and seawater desalination and mineral precipitation are simultaneously achieved. The high-temperature and high-pressure steam drives the steam turbine generator set to generate electricity and produces waste hot water, thereby realizing energy recovery and utilization. The waste hot water generated in step 6 is heat exchanged with normal-temperature mineral seawater through a heat exchanger C, and normal-temperature fresh water is output to meet the fresh water demand. The mineral seawater after heat exchange is transported to the heat exchanger B in step 3 for recycling, thereby improving the overall efficiency of the system.

[0038] The present application realizes efficient utilization of the thermal energy of normal temperature seawater through a series of steps such as heat exchanger A, compression, heat exchanger B, and expansion valve throttling and pressure reduction, and uses this thermal energy for heating, power generation and desalination of mineral seawater. The method not only innovatively utilizes the thermal energy of seawater to convert it into cheap electricity, but also significantly improves the efficiency of seawater desalination, and realizes the effective utilization of mineral resources, so that seawater resources are more fully and efficiently utilized.

[0039] By calculating the heat absorbed by the phase change thermostat during the heat exchange process and the heat transferred by the high-temperature and high-pressure phase change thermostat to the mineral seawater in the heat exchanger B through a specific formula, the present application realizes precise control of the heat exchange process, helps to optimize the system efficiency, ensures the maximum utilization of the phase change thermostat when absorbing and releasing heat, reduces energy loss, and improves the energy efficiency of the entire system.

[0040] This application provides an estimation formula for seawater desalination efficiency, so that the system performance can be quantitatively evaluated and the system structure and parameters can be adjusted according to actual needs to further improve the desalination efficiency. At the same time, the system operator can also evaluate the actual operating efficiency of the system based on the formula and adjust the operating parameters accordingly to ensure that the system maintains high desalination efficiency.

[0041] The system in this application realizes energy recycling through the utilization of waste heat and power generation. By calculating the power generated by the steam turbine generator set, the energy utilization efficiency of the system can be evaluated, providing an important reference for the economy and feasibility of the system. The energy recycling mechanism not only reduces the operating cost of the system, but also improves the economic benefits of the system.

[0042] Explanation of several terms in this application: (1) Phase change thermostatic agent - also known as refrigerant or heating agent, is a working fluid that completes the thermodynamic cycle in the heat exchanger. It absorbs heat from the cooled object at low temperature and then transfers it to other objects at a higher temperature. (2) Heat carrier water - In the steam turbine power generation system, the water involved in power generation realizes heat absorption, transmission and mechanical energy conversion through phase change and circulation. Its core function is to be a medium that carries heat energy and drives the step-by-step conversion of energy, so it is called heat carrier water.

[0043] Most of the energy on Earth, whether directly or indirectly, comes from the sun. The sun not only provides instant energy, but also stores its energy in various forms of energy through a complex conduction process for use by humans and other organisms. "Photovoltaic power generation" uses the instant energy of sunlight to generate electricity, and has a low energy density. This is like catching loaches with bare hands. Many loaches will slip away and are difficult to catch. However, seawater has accumulated huge thermal energy after long-term exposure to sunlight, and its energy density is very high. Using seawater thermal energy to generate electricity is like using a fishing net to scoop up loaches, which is easy to collect. The basic principle of seawater source water heaters is similar to that of air source water heaters. Both use the reverse Carnot cycle principle. Since the specific heat capacity of water is much greater than that of air, and its mass density is also much greater than that of air, the energy efficiency ratio of seawater source water heaters will greatly exceed that of air source water heaters. From a technical point of view, it is feasible to use normal temperature seawater thermal energy to generate electricity with super high energy efficiency, and it is expected to become a very cheap new energy source in the future. The coordinated implementation of normal temperature seawater thermal power generation, seawater desalination and seawater mining can improve the comprehensive utilization rate of seawater resources, reduce resource waste, help build a negative carbon cycle of "power generation-water production-carbon fixation", reduce power generation costs, achieve cheap electricity, reduce fresh water production costs, and solve the problem of water resource shortage. At the same time, comprehensive industrialization can significantly save energy and reduce emissions and reduce pollution to the environment.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. 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 method for generating electricity using thermal energy from water at room temperature, characterized in that: The phase change temperature control agent absorbs heat from the water at room temperature by evaporation heat absorption principle, and then transfers the heat to the heat carrier water by condensation heat release principle to heat it up and use it for power generation.

2. A method for generating electricity from water body heat at room temperature according to claim 1, characterized in that: The method The following steps are involved: S1: Using the principle of heat absorption by evaporation of phase change temperature regulating agent, heat exchange is performed with normal temperature water through heat exchanger A to absorb heat from the normal temperature water; S2: The phase change temperature regulating agent after absorbing heat is transported to the compressor for compression processing to form a high-temperature and high-pressure working fluid; S3: The high-temperature and high-pressure working fluid exchanges heat with the heat carrier water in the heat exchanger B, transferring heat to the heat carrier water to increase its temperature; S4: performing throttling and pressure reduction processing of the phase change temperature regulating agent after the heat exchange is completed by the expansion valve, and then returning to step S1 for circulation; S5: inputting the heated heat carrier water into the boiler to prepare high-temperature and high-pressure steam; S6: Use high-temperature and high-pressure steam to drive the steam turbine generator set to generate electricity and output waste heat hot water; S7: The waste hot water generated in step S6 is transported to the heat exchanger B in step S3 for further heating and recycling.

3. A method for comprehensive utilization of seawater resources, characterized in that: The power generation method described in claim 1 is used to generate electricity by utilizing the thermal energy of normal temperature seawater while performing seawater desalination and mineral extraction, thereby achieving energy recycling.

4. A method for comprehensive utilization of seawater resources according to claim 3, characterized in that: The method The following steps are involved: S1: Using the principle of heat absorption by evaporation of phase change temperature regulating agent, heat exchange is carried out with heat source seawater through heat exchanger A to absorb heat from seawater; S2: The phase change temperature regulating agent after absorbing heat is transported to the compressor for compression processing to form a high-temperature and high-pressure working fluid; S3: The high-temperature and high-pressure working fluid exchanges heat with the mineral seawater in the heat exchanger B, transferring heat to the mineral seawater to increase its temperature; S4: performing throttling and pressure reduction processing of the phase-change temperature regulating agent after the heat exchange is completed by the expansion valve, and then returning to step S1 for circulation; S5: The heated mineral seawater is input into the boiler to prepare high-temperature and high-pressure steam, thereby achieving seawater desalination and mineral output simultaneously; S6: Use high-temperature and high-pressure steam to drive the steam turbine generator set to generate electricity and produce waste heat hot water; S7: The waste heat water generated in step S6 is heat exchanged with normal temperature mineral seawater through a heat exchanger C to output normal temperature fresh water; S8: The mineral seawater after the heat exchange in step S7 is transported to the heat exchanger B in step S3 for further heating and recycling.

5. A method for comprehensive utilization of seawater resources according to claim 4, characterized in that: In step S1, the heat Q1 absorbed by the phase change temperature regulating agent from the heat source seawater is calculated by the following formula: Q1 = m_phase change thermostat × c_phase change thermostat × (T_heat source seawater - T_phase change thermostat initial) Among them, m_phase change thermostat is the mass flow rate of the phase change thermostat, c_phase change thermostat is the specific heat capacity of the phase change thermostat, T_heat source seawater is the temperature of the heat source seawater, and T_phase change thermostatinitial is the initial temperature of the phase change thermostat.

6. The method for comprehensive utilization of seawater resources according to claim 4, characterized in that: In step S3, the heat Q2 transferred from the high-temperature and high-pressure phase-change temperature regulating agent to the mineral source seawater in the heat exchanger B is expressed as: Q2 = m_phase change temperature regulator × (h_high temperature and high pressure - h_low temperature and low pressure) Among them, h_high temperature and high pressure is the enthalpy value of the high temperature and high pressure phase change thermostat, and h_low temperature and low pressure is the enthalpy value of the phase change thermostat after throttling and pressure reduction by the expansion valve. This heat is equal to the heat absorbed by the mineral source seawater, which increases its temperature.

7. The method for comprehensive utilization of seawater resources according to claim 4, characterized in that: In step S5, during the process of preparing high-temperature and high-pressure steam by the boiler, the desalination efficiency η_desalination of seawater is estimated by the following formula: η_Desalination = (m_fresh water / m_original seawater) × 100% Among them, m_freshwater is the amount of fresh water produced, and m_raw seawater is the amount of mineral seawater input into the boiler.

8. The method for comprehensive utilization of seawater resources according to claim 4, characterized in that: In step S6, the power P generated by the steam turbine generator set is calculated by the following formula: P = η_unit × (Q_steam - Q_loss) Among them, η_unit is the efficiency of the steam turbine generator set, Q_steam is the heat of high-temperature and high-pressure steam, and Q_loss is the heat loss in the system.

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