An ocean thermal energy combined supply system

Abstract

The present invention discloses an ocean thermal energy combined supply system. The system respectively sucks surface seawater and deep seawater through a water supply module. After using the surface seawater as a heat source to heat the working medium in a steam generator, the working medium vaporizes. The gaseous working medium heated by a solar collector enters an expander to do work, enabling the expander to drive a generator to generate electricity. A part of the exhausted steam of the expander is transported to an evaporator, and the evaporator absorbs heat through evaporation to achieve refrigeration and output. The remaining liquid working medium in the steam generator sequentially releases heat through a first recuperator, then mixes with the exhausted steam of the expander and releases heat after passing through a second recuperator, and then mixes with the working medium of the evaporator and releases heat after passing through a third recuperator, and then enters a condenser to condense the working medium into a saturated liquid working medium. The saturated liquid working medium then sequentially enters the third recuperator, the second recuperator, and the first recuperator to absorb heat and increase the temperature, and then re-enters the steam generator. The technical solution of the present invention can output electric energy and cooling capacity while improving the conversion efficiency of ocean thermal energy.

Description

Technical Field

[0001] The present invention relates to the technical field of multi - supply of low - grade thermal energy, and particularly relates to an ocean thermal energy combined supply system. Background Art

[0002] The development of world energy faces many challenges such as resource shortage, environmental pollution, and climate change. Vigorously developing renewable energy technologies and improving the conversion efficiency of energy utilization systems are important measures to achieve carbon peak and carbon neutrality. China is a major ocean country with abundant ocean energy resources. Especially in the South China Sea region of China, the ocean thermal energy reserves are very large and have great development and utilization value. Therefore, developing ocean thermal energy can not only alleviate China's energy crisis and adjust the existing energy structure, but also protect the environment and promote the development of China's ocean energy.

[0003] Ocean thermal energy has advantages such as cleanliness, sustainability, and little influence by climate conditions. Its working principle is to drive a power generation cycle using the temperature difference between surface warm seawater (temperature 25°C - 28°C) and deep - layer cold seawater (temperature 4°C - 7°C) at a depth of 800 - 1000 meters to obtain electric energy. According to different cycle forms, ocean thermal energy power generation systems can be divided into three categories: open - cycle, closed - cycle, and hybrid - cycle. Among them, the research on closed - cycle is the most extensive and in - depth, and thermodynamic cycle systems such as organic Rankine cycle, Kalina cycle, Shangyuan cycle, and Guohai cycle have been proposed successively. However, limited by the temperature difference between the cold and heat sources of the system, its power generation efficiency is only up to 5% at most, and the power generation cost is relatively high, making it difficult to achieve commercialization. Therefore, it is necessary to improve the conversion efficiency of ocean thermal energy. Summary of the Invention

[0004] The main object of the present invention is to propose an ocean thermal energy combined supply system, aiming to solve the problem of low conversion efficiency of ocean thermal energy in the existing technology.

[0005] To achieve the above object, the ocean thermal energy combined supply system proposed by the present invention includes:

[0006] A water supply module, including a first pump body and a second pump body. The first pump body is used to pump surface seawater, and the second pump body is used to pump deep - layer seawater;

[0007] A steam generation module, including a steam generator and a solar collector. The first input port of the steam generator is connected to the output port of the first pump body, and the first output port of the steam generator is connected to the input port of the solar heat collecting plate; the second output port of the steam generator is used to discharge surface seawater; the inside of the steam generator is filled with a working medium;

[0008] The power generation module includes an expander and a generator; the input port of the expander is connected to the output port of the solar collector; the expander is drivingly connected to the generator;

[0009] The refrigeration module includes an evaporator and a place in need of cooling capacity. The input port of the evaporator is connected to the output port of the expander; the cooling capacity output port of the evaporator is connected to the place in need of cooling capacity;

[0010] The working fluid regenerative heat module includes at least a first regenerator, a second regenerator, a third regenerator and a condenser. The first input port of the first regenerator is connected to the second output port of the steam generator. The first output port of the first regenerator is connected to the first input port of the second regenerator. The first input port of the second regenerator is further connected to the output port of the expander. The first output port of the second regenerator is respectively connected to the first input port of the third regenerator and the output port of the evaporator. The first output port of the third regenerator is connected to the first input port of the condenser. The second input port of the condenser is connected to the output port of the second pump body. The first output port of the condenser is connected to the second input port of the third regenerator. The second output port of the condenser is used to discharge deep seawater. The second output port of the third regenerator is connected to the second input port of the second regenerator. The second output port of the second regenerator is connected to the second input port of the first regenerator. The second output port of the first regenerator is connected to the second input port of the steam generator.

[0011] Preferably, the steam generation module further includes a gas-liquid separator. The input port of the gas-liquid separator is connected to the first output port of the steam separator. The first output port of the gas-liquid separator is connected to the input port of the solar collector. The second output port of the gas-liquid separator is connected to the first input port of the first regenerator.

[0012] Preferably, the refrigeration module further includes a first flow regulator and a throttle valve. The input port of the first flow regulator is connected to the output port of the expander. The first output port of the first flow regulator is connected to the input port of the throttle valve. The output port of the throttle valve is connected to the input port of the evaporator. The second output port of the first flow regulator is connected to the first input port of the second temperature regenerator.

[0013] Preferably, the working fluid regenerative module further includes a first ejector and a second ejector. The first input port of the first ejector is connected to the first output port of the first regenerator, and the second input port of the first ejector is connected to the second output port of the first flow regulator. The output port of the first ejector is connected to the first input port of the second temperature regenerator. The first output port of the second regenerator is connected to the first input port of the second ejector, and the second input port of the second ejector is connected to the output port of the evaporator. The output port of the second ejector is connected to the first input port of the third regenerator.

[0014] Preferably, the working fluid regenerative module further includes a third pump body. The input port of the third pump body is connected to the first output port of the condenser, and the output port of the third pump body is connected to the second input port of the third regenerator.

[0015] Preferably, the ocean thermal energy combined supply system further includes a deep seawater desalination and concentration module. The deep seawater desalination and concentration module includes a heat exchanger and a reverse osmosis device. The first input port of the heat exchanger is connected to the second output port of the steam generator, and the second input port of the heat exchanger is connected to the second output port of the condenser. The first output port of the heat exchanger is connected to the input port of the reverse osmosis device, and the second output port of the heat exchanger is used to discharge surface seawater. The first output port of the reverse osmosis device is used to output desalinated liquid, and the second output port of the reverse osmosis device is used to output concentrated liquid.

[0016] Preferably, the deep seawater desalination and concentration module further includes a second flow regulator. The input port of the second flow regulator is connected to the second output port of the condenser, the first output port of the second flow regulator is connected to the second input port of the heat exchanger, and the second output port of the second flow regulator is used to discharge deep seawater.

[0017] Preferably, the generator is electrically connected to the first pump body, the second pump body, and the reverse osmosis device respectively.

[0018] Preferably, the places that need cooling capacity include cold storages.

[0019] Preferably, the working fluid includes azeotropic mixture working fluid.

[0020] The technical solution of the present invention pumps surface seawater into a steam generator by using a first pump body. After the working medium in the steam generator absorbs the heat of the surface seawater, the working medium changes from a liquid state to a gas-liquid mixed state. Among them, the gaseous working medium is input into a solar collector, and the solar collector has the function of increasing the temperature of the gaseous working medium. The heated gaseous working medium enters an expander, and the gaseous working medium drives the expander to do work, so that the expander drives a generator to operate and generate electricity; by setting the solar collector, the enthalpy value of the gaseous working medium at the input port of the expander is increased, so as to improve the power generation capacity of the ocean thermal energy combined supply system; a part of the exhaust steam (gas-liquid mixed working medium) of the expander enters an evaporator, and the evaporator absorbs heat by evaporation to achieve refrigeration. The cold output port of the evaporator is connected to the place where cold is needed to output cold; and the remaining liquid working medium in the steam generator enters a first regenerator and releases heat for the first time. Subsequently, the first regenerator inputs the liquid working medium into a second regenerator, and another part of the exhaust steam of the expander is input into the second regenerator. In the second regenerator, the liquid working medium is mixed with the exhaust steam (gas-liquid mixed working medium), releases heat for the second time and reformed into a gas-liquid mixed state working medium. The second regenerator then inputs the gas-liquid mixed working medium into a third regenerator, and the gas-liquid mixed working medium of the evaporator is output to the third regenerator. The working medium in the third regenerator is mixed and then enters a condenser after releasing heat for the third time. The condenser condenses the gas-liquid mixed working medium into a saturated liquid working medium; the saturated liquid working medium then enters the third regenerator, the second regenerator and the first regenerator in sequence to absorb heat and increase the temperature. The saturated liquid working medium after temperature increase re-enters the steam generator to complete the working medium cycle and achieve high-efficiency conversion and utilization of heat; the water supply module, the steam generation module, the power generation module, the refrigeration module and the working medium regeneration module are interconnected to form an operation cycle of power generation and refrigeration, so as to achieve the purpose of providing electric energy and cold simultaneously, and by adding the working medium regeneration module, the utilization rate of waste heat in the system is improved, thereby improving the conversion efficiency of ocean thermal energy. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0022] Figure 1 It is a schematic structural connection diagram of an embodiment of the ocean thermal energy combined supply system of the present invention.

[0023] Explanation of the reference numerals in the drawings:

[0024]

[0025]

[0026] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0030] The present invention provides an ocean thermal energy combined supply system.

[0031] Refer to Figure 1, in an embodiment of the present invention, the ocean thermal energy combined supply system includes a water supply module 1, a steam generation module 2, a power generation module 3, a refrigeration module 4, and a working fluid regenerative heat module 5; the water supply module 1 includes a first pump 11 and a second pump 12, the first pump 11 is used to pump surface seawater, and the second pump 12 is used to pump deep seawater; the steam generation module 2 includes a steam generator 21 and a solar collector 23, a first input port of the steam generator 21 is connected to an output port of the first pump 11, and a first output port of the steam generator 21 is connected to an input port of the solar heat collecting plate; a second output port of the steam generator is used to discharge surface seawater; a working fluid is installed inside the steam generator 21; the power generation module 3 includes an expander 31 and a generator 32; an input port of the expander 31 is connected to an output port of the solar heat collecting plate; the expander 31 is in driving connection with the generator 32; the refrigeration module 4 includes an evaporator 41 and a place 42 that requires cooling capacity, an input port of the evaporator 41 is connected to an output port of the expander 31; a cooling capacity output port of the evaporator 41 is connected to the place 42 that requires cooling capacity; the working fluid regenerative heat module 5 includes at least a first regenerator 51, a second regenerator 52, a third regenerator 53, and a condenser 54, a first input port of the first regenerator 51 is connected to a second output port of the steam generator 21, a first output port of the first regenerator 51 is connected to a first input port of the second regenerator 52, a first input port of the second regenerator 52 is further connected to an output port of the expander 31, a first output port of the second regenerator 52 is respectively connected to a first input port of the third regenerator 53 and an output port of the evaporator 41, a first output port of the third regenerator 53 is connected to a first input port of the condenser 54; a second input port of the condenser 54 is connected to an output port of the second pump 12, a first output port of the condenser 54 is connected to a second input port of the third regenerator 53; a second output port of the condenser 54 is used to discharge deep seawater; a second output port of the third regenerator 53 is connected to a second input port of the second regenerator 52; a second output port of the second regenerator 52 is connected to a second input port of the first regenerator 51; a second output port of the first regenerator 51 is connected to a second input port of the steam generator 21.

[0032] After research, it was found that the existing measure to solve the conversion rate problem is to heat the surface seawater. Due to the large specific heat of seawater, there is a problem of large energy loss in the heating process. Based on the above problem, this embodiment takes a different approach by using a first pump body 11 to pump the surface seawater to the steam generator 21. After the working fluid in the steam generator 21 absorbs the heat of the surface seawater, the working fluid changes from a liquid state to a gas-liquid mixed state. The gaseous working fluid passes through the first output port of the steam generator 21 and is input from the input port of the solar collector 23. The solar collector 23 has the function of increasing the temperature of the gaseous working fluid. The heated gaseous working fluid is output from the input port of the solar collector 23. Output, input from the input port of the expander 31 into the expander 31, the gaseous working medium pushes the expander 31 to do work, the expander 31 is connected to the generator 32, so that the expander 31 drives the generator 32 to operate and generate electricity; by setting the solar collector 23, the enthalpy value of the gaseous working medium at the input port of the expander 31 is increased, so as to improve the power generation capacity of the ocean temperature difference energy supply system; part of the exhaust steam (gas-liquid mixed working medium) of the expander 31 enters the evaporator 41, and the evaporator 41 absorbs heat by evaporation to achieve refrigeration, and the cooling output port of the evaporator 41 is connected to the place 42 where cooling is required for cooling output; and the remaining liquid in the steam generator 21 The liquid working medium is output from the output port of the steam generator and releases heat for the first time from the first regenerator 51. Then, the first regenerator 51 inputs the liquid working medium into the second regenerator 52. Another part of the exhaust steam from the expander 31 is input into the second regenerator 52. The liquid working medium in the second regenerator 52 is mixed with the exhaust steam (gas-liquid mixed working medium), releases heat for the second time and re-forms the working medium in the gas-liquid mixed state. The second regenerator 52 then inputs the gas-liquid mixed working medium into the third regenerator 53. The gas-liquid mixed working medium of the evaporator 41 is output to the third regenerator 53. After mixing, the working medium in the third regenerator 53 releases heat for the third time and enters the condenser 54 for condensation. The regenerator 54 condenses the gas-liquid mixed working medium into a saturated liquid working medium; the saturated liquid working medium then enters the third regenerator 53, the second regenerator 52 and the first regenerator 51 in sequence to absorb heat and increase the temperature. The saturated liquid working medium after the temperature increase re-enters the steam generator 21, completing the working medium cycle and realizing high-efficiency conversion and utilization of heat; the water supply module 1, the steam generation module 2, the power generation module 3, the refrigeration module 4 and the working medium heat recovery module 5 are interconnected to form an operating cycle of power generation and refrigeration, thereby realizing the purpose of providing electricity and cooling at the same time, and by adding the working medium heat recovery module 5, the utilization rate of waste heat in the ocean temperature difference energy supply system is improved, thereby improving the conversion efficiency of ocean temperature difference energy.

[0033] Specifically, the output shaft of the expander 31 is connected to the rotating shaft of the generator 32 via a coupling, and the expander 31 drives the generator 32 to generate electricity.

[0034] Preferably, the steam generation module further includes a gas-liquid separator 22. The input port of the gas-liquid separator 22 is connected to the first output port of the steam separator, and the first output port of the gas-liquid separator 22 is connected to the input port of the solar heat collector; the second output port of the gas-liquid separator 22 is connected to the first input port of the first regenerator 51.

[0035] In the above structure, after the working fluid in the steam generator 21 absorbs the heat of the surface seawater, the working fluid in the steam generator 21 changes from a liquid state to a gas-liquid mixed state; the steam generator 21 inputs the gas-liquid mixed working fluid into the gas-liquid separator 22, and the gas-liquid separator 22 separates saturated steam, i.e., gaseous working fluid, from the gas-liquid mixed working fluid; the gas-liquid separator 22 inputs the gaseous working fluid into the solar heat collector 23 for heating. The solar heat collector 23 is used to absorb heat externally and uses the absorbed heat to increase the temperature of the gaseous working fluid, thereby increasing the enthalpy value of the gaseous working fluid entering the expander 31.

[0036] Preferably, the generator 32 is electrically connected to the first pump body 11, the second pump body 12, and the reverse osmosis device 62 respectively.

[0037] In the above structure, the mechanical energy output by the expander 31 drives the generator 32 to generate electricity. After the electricity generated by the generator 32 meets the energy consumption of the first pump body 11, the second pump body 12, and the reverse osmosis device 62 of the ocean thermal energy combined supply system itself, the remaining generated electricity is delivered to the user side as a product.

[0038] Preferably, the place 42 that requires cooling includes a cold storage. In the above structure, the cold storage is a refrigeration device and also a constant-temperature storage cold air device. The cold output port of the evaporator 41 is connected to the cold storage, so that the cold generated by the evaporator 41 is stored in the cold storage, and then the cold storage provides cold for the user side.

[0039] Preferably, the working fluid includes a non-azeotropic mixture. In the above structure, a non-azeotropic mixture is used as the circulating working fluid, and its characteristic of having a variable temperature during the phase change process is utilized to reduce the mismatch between the working fluid in the steam generator 21 and the heat source, thereby reducing the irreversible energy loss in the ocean thermal energy combined supply system; it should be noted that the non-azeotropic mixture can adopt non-azeotropic organic substances such as ammonia water.

[0040] Preferably, the refrigeration module 4 further includes a first flow regulator 43 and a throttle valve 44. The input port of the first flow regulator 43 is connected to the output port of the expander 31, and the first output port of the first flow regulator 43 is connected to the input port of the throttle valve 44; the output port of the throttle valve 44 is connected to the input port of the evaporator 41; the second output port of the first flow regulator 43 is connected to the first input port of the second regenerator.

[0041] In the above structure, the exhaust steam of the expander 31 is divided into two parts by the first flow regulator 43 and output from the first outlet and the second outlet respectively. The exhaust steam output from the first outlet of the first flow regulator 43 enters the evaporator 41 with a refrigeration effect after being depressurized by the throttle valve 44; the exhaust steam output from the second outlet of the first flow regulator 43 is input to the second regenerator 52 and mixed with the liquid working medium output from the first regenerator 51 for the working medium cycle. In addition, the throttle valve 44 is used to adjust the flow rate of the working medium input to the evaporator.

[0042] Preferably, the working medium heat regeneration module 5 further includes a first ejector 55 and a second ejector 56. The first input port of the first ejector 55 is connected to the first output port of the first regenerator 51, and the second input port of the first ejector 55 is connected to the second output port of the first flow regulator 43; the output port of the first ejector 55 is connected to the first input port of the second regenerator; the first output port of the second regenerator 52 is connected to the first input port of the second ejector 56, and the second input port of the second ejector 56 is connected to the output port of the evaporator 41; the output port of the second ejector 56 is connected to the first input port of the third regenerator 53.

[0043] In the above structure, after the gaseous working medium (saturated steam) is separated in the gas-liquid separator 22, the remaining saturated liquid working medium that has not been evaporated in the gas-liquid separator 22; this saturated liquid working medium enters the first regenerator 51 to release heat and then enters the first ejector 55; the saturated liquid working medium undergoes adiabatic expansion through the nozzle of the first ejector 55 and then is mixed with the remaining exhaust steam at the outlet of the expander 31 and enters the second regenerator 52 to form a saturated gas-liquid working medium; the saturated gas-liquid working medium enters the second ejector 56 after releasing heat in the second regenerator 52 and is mixed with the gas-liquid working medium output from the refrigeration evaporator 41. The second ejector 56 makes the saturated gas-liquid working medium reach the condensation pressure at the output port of the second ejector 56; the second ejector 56 then inputs the mixed saturated gas-liquid working medium into the first regenerator 51 to release heat, and the saturated gas-liquid working medium after releasing heat finally enters the condenser 54 to be condensed into a saturated liquid working medium; by using the first ejector 55 and the second ejector 56, the working medium heat regeneration module 5 and the refrigeration module 4 form a jet refrigeration cycle to achieve the purpose of providing cold for users. As a single mechanical component, the ejector does not consume electric energy, reducing the self-energy consumption of the ocean thermal energy combined power supply system; at the same time, the ejector is used to reduce the back pressure at the outlet of the expander 31, which has the effect of significantly improving the power generation capacity of the ocean thermal energy combined power supply system.

[0044] Preferably, the working fluid regenerative module 5 further includes a third pump body 57. The input port of the third pump body 57 is connected to the first output port of the condenser 54, and the output port of the third pump body 57 is connected to the second input port of the third regenerator 53.

[0045] In the above structure, the saturated liquid working fluid formed by condensation in the condenser 54 is pumped by the third pump body 57 to increase the pressure and then sequentially enters the first regenerator 51, the second regenerator 52 and the third regenerator 53 to absorb heat and increase the temperature. The heated saturated liquid working fluid then enters the steam generator 21 to form a working fluid cycle; the power generation module 3, the refrigeration module 4 and the working fluid regenerative module 5 cooperate with each other to realize the cycle of the ocean thermal energy combined supply system.

[0046] Preferably, the ocean thermal energy combined supply system further includes a deep seawater desalination and concentration module 6. The deep seawater desalination and concentration module 6 includes a heat exchanger 61 and a reverse osmosis device 62. The first input port of the heat exchanger 61 is connected to the second output port of the steam generator 21, and the second input port of the heat exchanger 61 is connected to the second output port of the condenser 54; the first output port of the heat exchanger 61 is connected to the input port of the reverse osmosis device 62, and the second output port of the heat exchanger 61 is used to discharge surface seawater; the first output port of the reverse osmosis device 62 is used to output desalinated liquid, and the second output port of the reverse osmosis device 62 is used to output concentrated liquid.

[0047] In the above structure, the second pump body 12 pumps deep seawater from the seabed and inputs it into the condenser 54. The condenser 54 uses the low temperature of the deep seawater to completely condense the working fluid in the gas-liquid mixed state and form a saturated liquid working fluid; then the condenser 54 inputs the used deep seawater into the heat exchanger 61. At the same time, the second output port of the steam generator 21 inputs surface seawater into the heat exchanger 61, so that the surface seawater and the deep seawater exchange heat in the heat exchanger 61. After the surface seawater releases sensible heat to increase the temperature of the deep seawater, the heat exchanger 61 directly discharges the surface seawater into the sea; and the heated deep seawater is input into the reverse osmosis device 62, and after being processed by the reverse osmosis device 62, desalinated liquid and concentrated liquid are obtained. Deep cold seawater is rich in mineral elements, which is not only beneficial to fishery breeding, but also can be used to manufacture health care products. Desalinated water can also solve the problem of regional fresh water supply and has rich utilization value; by adding the deep seawater desalination and concentration module 6, the comprehensive utilization of deep cold seawater is realized. The reverse osmosis device 62 is used to desalinate and concentrate the deep cold seawater. The obtained desalinated liquid flows into the water tank to provide fresh water, and the concentrated liquid flows into the liquid storage tank for further utilization in the future. It should be noted that the reverse osmosis device 62 includes a reverse osmosis seawater desalination device.

[0048] Preferably, the deep - sea water desalination and concentration module 6 further includes a second flow regulator 63. The input port of the second flow regulator 63 is connected to the second output port of the condenser 54. The first output port of the second flow regulator 63 is connected to the second input port of the heat exchanger 61. The second output port of the second flow regulator 63 is used to discharge deep - sea water.

[0049] In the above structure, the second flow regulator 63 is used to regulate the amount of deep - sea water input into the deep - sea water desalination and concentration module 6, and has the function of regulating the workload of the deep - sea water desalination and concentration module 6. The deep - sea water output by the condenser 54 is divided into two parts by the second flow regulator 63, and is respectively output from the first output port and the second output port of the second flow regulator 63. The deep - sea water from the first output port of the second flow regulator 63 is input into the heat exchanger 61 to exchange heat with surface seawater, and this part of the deep - sea water is processed by the reverse osmosis device 62 to generate desalinated liquid; the deep - sea water from the second output port of the second flow regulator 63 is directly discharged for other uses such as seawater aquaculture.

[0050] The ocean thermal energy combined supply system organically integrates the Kalina cycle, the ejector refrigeration cycle, the working fluid cycle and reverse osmosis seawater desalination, etc., to form a combined heat, power and cooling supply system jointly driven by ocean thermal energy and solar energy; the ocean thermal energy combined supply system uses renewable energy such as ocean thermal energy and solar energy to drive a thermodynamic cycle using non - azeotropic mixed organic substances such as ammonia water as the working fluid; at the same time, the reverse osmosis device 62 is used to desalinate and concentrate deep - sea water to obtain desalinated liquid and concentrated liquid. It realizes the simultaneous provision of electric energy, cooling capacity and fresh water for users, and achieves the purpose of improving the conversion efficiency of the ocean thermal energy system and comprehensively utilizing deep - sea water.

[0051] This ocean thermal energy combined supply system pumps surface seawater and deep seawater respectively through the water supply module 1. After using the surface seawater as a heat source to heat the working fluid in the steam generator 21, the working fluid vaporizes. The gaseous working fluid at the top of the gas-liquid separator 22 enters the expander 31 to do work after being heated by the solar collector 23, and drives the generator 32 to generate electricity. A part of the exhausted steam at the outlet of the expander 31 is depressurized by the throttle valve 56 and then sent to the evaporator 41. The working fluid evaporates and absorbs heat in the evaporator 41 to achieve refrigeration and output. The remaining liquid working fluid in the gas-liquid separator 22 first releases heat through the first recuperator 51, then mixes with the remaining exhausted steam of the expander 31, releases heat through the second recuperator 52, and then mixes with the working fluid at the outlet of the evaporator 41 and releases heat through the third recuperator 53, and enters the condenser 54 to condense the working fluid into a saturated liquid working fluid. The saturated liquid working fluid then enters the third recuperator 53, the second recuperator 52 and the first recuperator 51 in sequence to absorb heat and increase the temperature, and then re-enters the steam generator 21. The cold seawater at the outlet of the condenser 54 exchanges heat with the warm seawater at the outlet of the steam generator 21 in the warm and cold seawater heat exchanger 61. The warmed cold seawater enters the reverse osmosis device 62 to obtain fresh water and concentrated liquid respectively. The required electric energy is provided by the system itself, which can improve the conversion efficiency of ocean thermal energy while outputting electric energy, cold energy and fresh water.

[0052] The technical solution of the present invention pumps surface seawater to the steam generator 21 by using the first pump body 11. After the working medium in the steam generator 21 absorbs the heat of the surface seawater, the working medium changes from a liquid state to a gas-liquid mixed state. Among them, the gaseous working medium is input to the solar collector 23. The solar collector 23 has the function of increasing the temperature of the gaseous working medium. The heated gaseous working medium enters the expander 31. The gaseous working medium drives the expander 31 to do work, so that the expander 31 drives the generator 32 to operate and generate electricity; by setting the solar collector 23, the enthalpy value of the gaseous working medium at the input port of the expander 31 is increased, so as to improve the power generation capacity of the ocean thermal energy combined supply system; a part of the exhausted steam (gas-liquid mixed working medium) of the expander 31 enters the evaporator 41. The evaporator 41 absorbs heat through evaporation to achieve refrigeration. The cold output port of the evaporator 41 is connected to the place 42 that needs cold to output cold; and the remaining liquid working medium in the steam generator 21 enters the first recuperator 51 and releases heat for the first time. Subsequently, the first recuperator 51 inputs the liquid working medium into the second recuperator 52. Another part of the exhausted steam of the expander 31 is input to the second recuperator 52. In the second recuperator 52, the liquid working medium is mixed with the exhausted steam (gas-liquid mixed working medium), releases heat for the second time and re-forms the working medium in a gas-liquid mixed state. The second recuperator 52 then inputs the gas-liquid mixed working medium into the third recuperator 53. The gas-liquid mixed working medium of the evaporator 41 is output to the third recuperator 53. After the working medium in the third recuperator 53 is mixed and releases heat for the third time, it enters the condenser 54. The condenser 54 condenses the gas-liquid mixed working medium into a saturated liquid working medium; the saturated liquid working medium then enters the third recuperator 53, the second recuperator 52 and the first recuperator 51 in sequence for heat absorption and temperature increase. The saturated liquid working medium after temperature increase re-enters the steam generator 21 to complete the working medium cycle and realize the efficient conversion and utilization of heat; the water supply module 1, the steam generation module 2, the power generation module 3, the refrigeration module 4 and the working medium recuperation module 5 are interconnected to form an operation cycle of power generation and refrigeration, so as to achieve the purpose of providing electric energy and cold simultaneously. By adding the working medium recuperation module 5, the utilization rate of waste heat in the system is improved, thereby improving the conversion efficiency of ocean thermal energy.

[0053] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields shall be included in the patent protection scope of the present invention.

Claims

1. An ocean thermal energy combined supply system, characterized in that, Comprising: A water supply module, including a first pump body and a second pump body, where the first pump body is used to suck surface seawater, and the second pump body is used to suck deep seawater; A steam generation module, including a steam generator and a solar collector, where a first input port of the steam generator is connected to an output port of the first pump body, and a first output port of the steam generator is connected to an input port of the solar collector; a second output port of the steam generator is used to discharge surface seawater; a working medium is installed inside the steam generator; A power generation module, including an expander and a generator; an input port of the expander is connected to an output port of the solar collector; the expander is drivingly connected to the generator; A refrigeration module, including an evaporator and a place in need of cooling capacity, where an input port of the evaporator is connected to an output port of the expander; a cooling capacity output port of the evaporator is connected to the place in need of cooling capacity; A working medium regenerative heat module, at least including a first regenerator, a second regenerator, a third regenerator and a condenser, where a first input port of the first regenerator is connected to a second output port of the steam generator, a first output port of the first regenerator is connected to a first input port of the second regenerator, a first input port of the second regenerator is further connected to an output port of the expander, a first output port of the second regenerator is respectively connected to a first input port of the third regenerator and an output port of the evaporator, and a first output port of the third regenerator is connected to a first input port of the condenser; A second input port of the condenser is connected to an output port of the second pump body, and a first output port of the condenser is connected to a second input port of the third regenerator; a second output port of the condenser is used to discharge deep seawater; a second output port of the third regenerator is connected to a second input port of the second regenerator; a second output port of the second regenerator is connected to a second input port of the first regenerator; a second output port of the first regenerator is connected to a second input port of the steam generator; The steam generation module further includes a gas-liquid separator, where an input port of the gas-liquid separator is connected to a first output port of the steam generator, and a first output port of the gas-liquid separator is connected to an input port of the solar collector; a second output port of the gas-liquid separator is connected to a first input port of the first regenerator; The working medium regenerative heat module further includes a third pump body, where an input port of the third pump body is connected to a first output port of the condenser, and an output port of the third pump body is connected to a second input port of the third regenerator; The ocean thermal energy combined supply system further includes a deep seawater desalination and concentration module, where the deep seawater desalination and concentration module includes a heat exchanger and a reverse osmosis device, a first input port of the heat exchanger is connected to a second output port of the steam generator, and a second input port of the heat exchanger is connected to a second output port of the condenser; a first output port of the heat exchanger is connected to an input port of the reverse osmosis device, and a second output port of the heat exchanger is used to discharge surface seawater; a first output port of the reverse osmosis device is used to output desalinated liquid, and a second output port of the reverse osmosis device is used to output concentrated liquid; The deep seawater desalination and concentration module further includes a second flow regulator. The input port of the second flow regulator is connected to the second output port of the condenser. The first output port of the second flow regulator is connected to the second input port of the heat exchanger. The second output port of the second flow regulator is used to discharge deep seawater.

2. The ocean thermal energy combined supply system according to claim 1, wherein The refrigeration module further includes a first flow regulator and a throttle valve. The input port of the first flow regulator is connected to the output port of the expander. The first output port of the first flow regulator is connected to the input port of the throttle valve. The output port of the throttle valve is connected to the input port of the evaporator. The second output port of the first flow regulator is connected to the first input port of the second regenerator.

3. The ocean thermal energy combined supply system according to claim 2, wherein, The working fluid regenerative heat module further includes a first ejector and a second ejector. The first input port of the first ejector is connected to the first output port of the first regenerator. The second input port of the first ejector is connected to the second output port of the first flow regulator. The output port of the first ejector is connected to the first input port of the second regenerator. The first output port of the second regenerator is connected to the first input port of the second ejector. The second input port of the second ejector is connected to the output port of the evaporator. The output port of the second ejector is connected to the first input port of the third regenerator.

4. The ocean thermal energy combined supply system according to claim 1, characterized in that The generator is electrically connected to the first pump body, the second pump body, and the reverse osmosis device respectively.

5. The ocean thermal energy combined supply system according to any one of claims 1 to 3, characterized in that, The places that require cooling capacity include cold storages.

6. The ocean thermal energy combined supply system according to any one of claims 1 to 3, characterized in that, The working fluid includes azeotropic mixture working fluids.

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