Energy system and control method thereof

Abstract

The invention relates to an energy system and a control method thereof. The energy system comprises a power generation system and an energy storage and release system, the power generation system comprises an evaporator, a turbine, a condenser and a circulating pump which are sequentially and circularly communicated to form a power generation channel, the circulating pump is used for driving a circulating working medium to circularly flow in the power generation channel, and the evaporator can vaporize the flowing circulating working medium through surface layer warm water in a water area; the turbine can drive the generator to rotate to generate electric energy under the action of the vaporized circulating working medium, and the condenser can liquefy the circulating working medium flowing through the condenser through deep cold water in a water area. The energy storage and release system comprises a gas storage device, an energy storage unit and an energy release unit, the energy storage unit and the energy release unit communicate with the gas storage device, the energy storage and release system has an energy storage mode and an energy release mode, and in the energy storage mode, the energy storage unit and the evaporator can jointly vaporize the cycle working medium; and in the energy release mode, the energy release unit and the condenser can jointly liquefy the cycle fluid. According to the energy system, the energy conversion efficiency can be effectively improved.

Description

Technical Field

[0001] The present application relates to the fields of renewable energy technology and energy storage technology, and in particular to an energy system and a control method thereof. Background Art

[0002] As the global demand for renewable energy increases, finding efficient sustainable energy solutions and suitable energy storage solutions has become one of the important goals of scientific and technological development. Among them, since ocean thermal energy generation uses the temperature difference between the surface and deep water of the ocean to generate electricity, it has abundant resources and continuous energy supply capabilities. Compressed air energy storage technology can effectively solve the intermittent and instability problems of renewable energy generation by converting electrical energy into gas pressure energy. Therefore, ocean thermal energy generation and compressed air energy storage are becoming more and more mature and are currently research hotspots.

[0003] However, both thermoelectric power generation and compressed air energy storage systems suffer from low energy conversion efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide an energy system and a control method thereof to address the problem of low energy conversion efficiency in temperature difference energy power generation and compressed air energy storage systems.

[0005] The technical solution is as follows:

[0006] In a first aspect, the present application provides an energy system, comprising:

[0007] A power generation system, the power generation system comprising an evaporator, a turbine, a condenser and a circulating pump, the evaporator, the turbine, the condenser and the circulating pump are cyclically connected in sequence through a working medium pipeline to form a power generation channel for circulating working medium to circulate, the circulating pump is used to drive the circulating working medium to circulate in the power generation channel, the evaporator can use the surface warm water in the water area to vaporize the circulating working medium flowing through the evaporator, the turbine can drive the generator to rotate under the action of the vaporized circulating working medium to generate electricity, and the condenser can use the deep cold water in the water area to liquefy the circulating working medium flowing through the condenser;

[0008] An energy storage and release system, the energy storage and release system includes a gas storage device, an energy storage unit and an energy release unit, the gas storage device and the energy storage unit and the energy release unit are all connected through pipelines, the energy storage and release system has an energy storage mode and an energy release mode, in the energy storage mode, the energy storage unit can compress air and store the compressed air in the gas storage device, and the energy storage unit can vaporize the circulating working fluid together with the evaporator; in the energy release mode, the energy release unit can use the air stored in the gas storage device to expand and do work to generate electricity, and the energy release unit can liquefy the circulating working fluid together with the condenser.

[0009] In the above energy system, when the circulating pump drives the circulating working fluid to circulate in the power generation channel, the evaporator can heat the circulating working fluid under the action of the surface warm water to vaporize the circulating working fluid, so that when the vaporized circulating working fluid flows through the turbine, it can drive the turbine to do work to drive the generator to generate electricity, and the circulating working fluid flowing out of the turbine to the condenser can be cooled and liquefied under the action of deep cold water, so that the liquefied circulating working fluid can be pumped into the evaporator again under the action of the circulating pump for a new circulation, so the power generation system can utilize the temperature difference between the surface warm water and the deep cold water to achieve sustainable power supply. Furthermore, when the energy storage and release system is in the energy storage mode, the energy storage unit can compress the air and store the compressed air in the gas storage device to realize the storage of electric energy; and when the energy storage and release system is in the energy release mode, the energy release unit can utilize the expansion of the air stored in the gas storage device to generate electricity. Therefore, the energy storage and release system can store energy during the off-peak period of electric energy load and release energy during the peak period of electric energy load by switching between the energy storage mode and the energy release mode, thereby balancing electricity consumption and power generation, and ensuring the flexibility and adaptability of the energy system. Among them, in the energy storage mode, the energy storage unit can use the heat generated by the compressed air to heat and vaporize the circulating working fluid together with the evaporator; in the energy release mode, the energy release unit can use the energy absorption of compressed gas to cool and liquefy the circulating working fluid together with the condenser. Therefore, when the energy storage and release system is in the energy storage mode, the energy system can improve the energy conversion efficiency of compressed air energy storage by coupling the energy storage unit with the evaporator; when the energy storage and release system is in the energy release mode, the energy system can improve the energy conversion efficiency of temperature difference energy generation by coupling the energy release unit with the condenser, thereby constructing a comprehensive energy system with high energy conversion rate and integrating power generation and energy storage and release.

[0010] The technical solution is further described below:

[0011] In one embodiment, the energy storage unit includes a compressor and a compression heat exchanger, the compressor, the compression heat exchanger and the gas storage device are connected in sequence through a compression pipeline to form a compression channel, the compression pipeline between the compression heat exchanger and the gas storage device is provided with a first conduction valve, the first conduction valve is used to control the on-off of the compression channel, the compression heat exchanger is arranged in parallel with the evaporator through a first connecting pipe, the first connecting pipe is provided with a first connecting valve, the first connecting valve is used to control the on-off of the first connecting pipe; in the energy storage mode, the first conduction valve and the first connecting valve are both connected, the compressor can compress the air driven by the motor, and the compressed air can be stored in the gas storage device through the compression heat exchanger, the circulating pump can make the liquid circulating working medium flow into the evaporator and the compression heat exchanger at the same time, and the compression heat exchanger can make the compressed air and the liquid circulating working medium exchange heat to vaporize the circulating working medium.

[0012] In one embodiment, the energy release unit includes an expander and an expansion heat exchanger. The expander, the expansion heat exchanger and the gas storage device are connected in sequence through an expansion pipe to form an expansion channel. The expansion pipe between the expansion heat exchanger and the gas storage device is provided with a second conduction valve, and the second conduction valve is used to control the on-off of the expansion channel. The expansion heat exchanger is arranged in parallel with the condenser through a second connecting pipe. The second connecting pipe is provided with a second connecting valve, and the second connecting valve is used to control the on-off of the second connecting pipe. In the energy release mode, the second conduction valve and the second connecting valve are both connected, and the gas in the gas storage device can flow out of the gas storage device and flow through the expansion heat exchanger and the expander in sequence. The vaporous circulating working fluid flowing out of the turbine can flow into the condenser and the expansion heat exchanger at the same time. The expansion heat exchanger can make the compressed air exchange heat with the vaporized circulating working fluid to liquefy the circulating working fluid. The expander can drive the expansion generator to rotate to generate electricity under the expansion work of the compressed air.

[0013] In one embodiment, the number of the compressors is at least two, and at least two of the compressors are connected in sequence with the compression heat exchanger and the gas storage device through the compression pipeline to form the compression channel. The energy storage unit also includes at least one cooling heat exchanger, and one cooling heat exchanger is connected between two adjacent compressors. Each cooling heat exchanger has a first cold port and a first hot port that are connected. The number of the expanders is at least two, and at least two expanders are connected in sequence with the expansion heat exchanger and the gas storage device through the expansion pipeline to form the expansion channel. The energy release unit also includes at least one heating heat exchanger, and one heating heat exchanger is connected between two adjacent compressors. Each heating heat exchanger has a second cold port and a second hot port that are connected. The energy storage and release system also includes a heat storage tank and a cold storage tank, and each of the first cold ports is connected to the output port of the cold storage tank. The outlets are connected, each of the second cold outlets is connected to the input port of the cold storage tank, each of the first hot outlets is connected to the input port of the heat storage tank, and each of the second hot outlets is connected to the output port of the heat storage tank. The heat storage tank is used to store high-temperature energy storage medium, and the cold storage tank is used to store low-temperature energy storage medium. In the energy storage mode, at least two of the compressors can perform staged compression on the air driven by the motor, and the cooling heat exchanger located between two adjacent compressors can perform heat exchange on the low-temperature energy storage medium with the air compressed by the compressor of the previous stage; in the energy release mode, at least two of the expanders can perform staged expansion on the compressed air to drive the expansion generator to rotate and generate electricity, and the heating heat exchanger located between two adjacent expanders can perform heat exchange on the high-temperature energy storage medium with the air discharged from the expander of the previous stage.

[0014] In one embodiment, the evaporator is further connected with a warm water pipe and a first drain pipe, the warm water pipe is provided with a warm water pump, the warm water pump is used to extract surface warm water in the water area to the evaporator, so that the evaporator can use the surface warm water in the water area to vaporize the circulating working fluid flowing through the evaporator, and the first drain pipe is used to discharge the surface warm water after heat exchange;

[0015] And / or, the condenser is also connected to a cold water pipe and a second drain pipe, and a cold water pump is provided on the cold water pipe. The cold water pump is used to pump deep cold water in the water area to the condenser, so that the condenser can utilize the deep cold water in the water area to liquefy the circulating working fluid flowing through the condenser, and the second drain pipe is used to discharge the deep cold water after heat exchange.

[0016] In one embodiment, the gas storage device is used to be arranged under the water surface of the water area, and the gas storage device includes an air storage box, and the air storage box is formed with an air storage cavity with an opening, and the opening of the air storage cavity is used to face away from the water surface, and the air storage cavity is used to store the air compressed by the energy storage unit; the energy storage and release system also includes a pressure regulating unit and a pressure sensor, and the pressure sensor is arranged in the air storage cavity, and the pressure sensor is used to detect the pressure of the air in the air storage cavity, and the pressure regulating unit is connected to the air storage box. When the pressure value detected by the pressure sensor is not equal to the predetermined pressure value, the pressure regulating unit can adjust the depth of the air storage tank in the water according to the pressure value detected by the pressure sensor.

[0017] In one embodiment, the pressure regulating unit includes a base, a guide rail and a lifting assembly, the base is used to be fixed on the bottom of the water area, one end of the guide rail is connected to the base, and the other end is used to extend to the side close to the water surface, the air storage tank is slidably connected to the guide rail, and the lifting assembly is connected to the air storage tank. When the pressure value detected by the pressure sensor is greater than the predetermined pressure value, the lifting assembly can drive the air storage tank to move along the guide rail away from the base; when the pressure value detected by the pressure sensor is less than the predetermined pressure value, the lifting assembly can drive the air storage tank to move along the guide rail close to the base; the air storage device also includes a brake assembly arranged on the air storage tank, and the brake assembly is used to lock the air storage tank and the guide rail.

[0018] In one embodiment, the air storage tank forms a sealed water storage space and a water suction port connected to the water storage space, the water storage space is used to store water, the cold water pipe includes a first cold water section and a second cold water section that are connected to each other, the end of the first cold water section away from the second cold water section is connected to the condenser, the cold water pump is arranged in the first cold water section, the cold water pump can pump deep cold water in the water area to the condenser through the second cold water section, the second cold water section is provided with a cold water valve for controlling the on and off of the second cold water section, the lifting assembly includes a water suction valve, a water pumping valve and a water pumping pipe, the water suction valve is arranged at the water suction port, the water suction valve is used to open or close the water suction port, one end of the water pumping pipe is connected to the water storage space The water pumping valve is arranged on the water pumping pipe, and the water pumping valve is used to control the on-off of the water pumping pipe; when the pressure value detected by the pressure sensor is greater than the predetermined pressure value, the cold water valve and the water pumping valve are both opened, the water suction valve is closed, and the cold water pump sucks the water stored in the water storage space through the water suction pipe to drive the air storage box to move along the guide rail to the side away from the base; when the pressure value detected by the pressure sensor is less than the predetermined pressure value, the cold water valve and the water suction valve are both opened, the water pumping valve is closed, and the water storage space sucks water through the water suction port to drive the air storage box to move along the guide rail to the side close to the base.

[0019] In one embodiment, the energy system also includes an above-water platform, which is used to be set above the water surface of the water area, and the end of the guide rail away from the base is connected to the above-water platform, and the evaporator, the turbine, the condenser, the circulating pump, the energy storage unit and the energy release unit are all arranged on the above-water platform.

[0020] In a second aspect, the present application further provides a control method for an energy system, which is implemented using any of the above energy systems and includes the following steps:

[0021] The circulating pump drives the circulating medium to circulate in the power generation channel, the evaporator uses the surface warm water in the water area to vaporize the circulating medium flowing through the evaporator, the turbine drives the generator to rotate under the action of the vaporized circulating medium to generate electric energy, and the condenser uses the deep cold water in the water area to liquefy the circulating medium flowing through the condenser;

[0022] When the electric energy load is low, the energy storage and release system enters the energy storage mode, the energy storage unit compresses air and stores the compressed air in the air storage device, and the energy storage unit and the evaporator jointly vaporize the circulating working medium;

[0023] When the power load is at its peak, the energy storage and release system enters the energy release mode, the energy release unit utilizes the air stored in the gas storage device to expand and do work to generate electricity, and the energy release unit and the condenser jointly liquefy the circulating working fluid.

[0024] In the above control method, when the circulating pump drives the circulating working fluid to circulate in the power generation channel, the evaporator can heat the circulating working fluid under the action of the surface warm water to vaporize the circulating working fluid, so that when the vaporized circulating working fluid flows through the turbine, it can drive the turbine to do work to drive the generator to generate electricity, and the circulating working fluid flowing out of the turbine to the condenser can be cooled and liquefied under the action of deep cold water, so that the liquefied circulating working fluid can be pumped into the evaporator again under the action of the circulating pump for a new circulation, so the power generation system can utilize the temperature difference between the surface warm water and the deep cold water to achieve sustainable power supply. Furthermore, when the energy storage and release system is in the energy storage mode, the energy storage unit can compress the air and store the compressed air in the gas storage device to realize the storage of electric energy; and when the energy storage and release system is in the energy release mode, the energy release unit can utilize the expansion of the air stored in the gas storage device to generate electricity. Therefore, the energy storage and release system can store energy during the off-peak period of electric energy load and release energy during the peak period of electric energy load by switching between the energy storage mode and the energy release mode, thereby balancing electricity consumption and power generation, and ensuring the flexibility and adaptability of the energy system. Among them, in the energy storage mode, the energy storage unit can use the heat generated by the compressed air to heat and vaporize the circulating working fluid together with the evaporator; in the energy release mode, the energy release unit can use the energy absorption of compressed gas to cool and liquefy the circulating working fluid together with the condenser. Therefore, when the energy storage and release system is in the energy storage mode, the energy system can improve the energy conversion efficiency of compressed air energy storage by coupling the energy storage unit with the evaporator; when the energy storage and release system is in the energy release mode, the energy system can improve the energy conversion efficiency of temperature difference energy power generation by coupling the energy release unit with the condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of an energy system in one embodiment.

[0026] Figure 2 It is a result schematic diagram of the energy system in another embodiment.

[0027] Description of reference numerals:

[0028] 100. Energy system; 1. Power generation system; 11. Evaporator; 111. First drain pipe; 112. Warm water pipe; 113. Warm water pump; 12. Turbine; 13. Generator; 14. Working medium pipeline; 15. Condenser; 151. Second drain pipe; 152. Cold water pipe; 152a. First cold water section; 152b. Second cold water section; 153. Cold water pump; 154. Cold water valve; 16. Circulation pump; 21. Energy storage unit; 211. Motor; 212. Compressor; 213. Cooling heat exchanger; 214. Compression pipeline; 214a. First conduction valve; 215. Compression heat exchanger; 215a. First connecting pipe; 215b. First connecting valve; 22 , energy release unit; 221, expansion generator; 222, expansion machine; 223, heating heat exchanger; 224, expansion heat exchanger; 224a, second connecting pipe; 224b, second connecting valve; 225, expansion pipeline; 225a, second conduction valve; 24, heat storage tank; 23, cold storage tank; 25, gas storage device; 251, gas storage box; 251a, gas storage cavity; 251b, water storage space; 252, brake assembly; 26, pressure regulating unit; 261, base; 262, guide rail; 263, lifting assembly; 2631, water pumping pipe; 2632, water pumping valve; 2633, water suction valve; 27, pressure sensor; 3, water platform; h0, water surface; h1, bottom of water. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0035] See also Figure 1 and Figure 2 , an energy system 100 provided in one embodiment of the present application includes a power generation system 1 and an energy storage and release system. Among them:

[0036] The power generation system 1 includes an evaporator 11, a turbine 12, a condenser 15 and a circulating pump 16. The evaporator 11, the turbine 12, the condenser 15 and the circulating pump 16 are circulated and connected in sequence through a working fluid pipeline 14 to form a power generation channel for circulating working fluid. The circulating pump 16 is used to drive the circulating working fluid to circulate in the power generation channel. The evaporator 11 can use the surface warm water in the water area to vaporize the circulating working fluid flowing through the evaporator 11. The turbine 12 can drive the generator 13 to rotate to generate electricity under the action of the vaporized circulating working fluid. The condenser 15 can use the deep cold water in the water area to liquefy the circulating working fluid flowing through the condenser 15. The energy storage and release system includes a gas storage device 25, an energy storage unit 21 and an energy release unit 22. The gas storage device 25, the energy storage unit 21 and the energy release unit 22 are all connected through pipelines. The energy storage and release system has an energy storage mode and an energy release mode. In the energy storage mode, the energy storage unit 21 can compress air and store the compressed air in the gas storage device 25, and the energy storage unit 21 can vaporize the circulating working fluid together with the evaporator 11; in the energy release mode, the energy release unit 22 can use the air stored in the gas storage device 25 to expand and do work to generate electricity, and the energy release unit 22 can liquefy the circulating working fluid together with the condenser 15.

[0037] In the above-mentioned energy system 100, when the circulating pump 16 drives the circulating working fluid to circulate in the power generation channel, the evaporator 11 can heat the circulating working fluid under the action of the surface warm water to vaporize the circulating working fluid, so that when the vaporized circulating working fluid flows through the turbine 12, it can drive the turbine 12 to do work to drive the generator 13 to generate electricity, and the circulating working fluid flowing out of the turbine 12 to the condenser 15 can be cooled and liquefied under the action of deep cold water, so that the liquefied circulating working fluid can be pumped into the evaporator 11 again under the action of the circulating pump 16 for a new circulation, so that the power generation system 1 can utilize the temperature difference between the surface warm water and the deep cold water to achieve sustainable power supply. Furthermore, when the energy storage and release system is in the energy storage mode, the energy storage unit 21 can compress air and store the compressed air in the gas storage device 25 to realize the storage of electric energy; and when the energy storage and release system is in the energy release mode, the energy release unit 22 can utilize the expansion of the air stored in the gas storage device 25 to do work to generate electricity. Therefore, the energy storage and release system can store energy during the off-peak period of electric energy load and release energy during the peak period of electric energy load by switching between the energy storage mode and the energy release mode, thereby balancing electricity consumption and power generation, and ensuring the flexibility and adaptability of the energy system 100. Among them, in the energy storage mode, the energy storage unit 21 can use the heat generated by the compressed air to heat and vaporize the circulating working fluid together with the evaporator 11; in the energy release mode, the energy release unit 22 can use the energy absorption of the compressed gas to cool and liquefy the circulating working fluid together with the condenser 15. Therefore, when the energy storage and release system is in the energy storage mode, the energy system 100 can improve the energy conversion efficiency of compressed air energy storage by coupling the energy storage unit 21 with the evaporator 11; when the energy storage and release system is in the energy release mode, the energy system 100 can improve the energy conversion efficiency of temperature difference energy power generation by coupling the energy release unit 22 with the condenser 15, thereby constructing a comprehensive energy system 100 with high energy conversion rate and integrating power generation and energy storage and release.

[0038] It should be noted that when the energy storage and release system switches between the energy storage mode and the energy release mode, the power generation system 1 can be in a state of external power generation, that is, when the energy storage and release system is in the energy storage mode of storing electric energy, the power generation system 1 can continue to work to generate electricity externally; when the energy storage and release system is in the energy release mode of releasing electric energy, the power generation system 1 can also continue to work to generate electricity externally.

[0039] Indicatively, the water area may be an ocean, so as to fully utilize the temperature difference of the ocean to meet the electricity demand of coastal areas, isolated islands and offshore platforms.

[0040] Illustratively, the circulating working fluid may be a material with a low boiling point, such as butane and ammonia.

[0041] Optionally, in one embodiment, the evaporator 11 is also connected to a warm water pipe 112 and a first drain pipe 111. A warm water pump 113 is provided on the warm water pipe 112. The warm water pump 113 is used to extract surface warm water in the water area to the evaporator 11, so that the evaporator 11 can use the surface warm water in the water area to vaporize the circulating working fluid flowing through the evaporator 11. The first drain pipe 111 is used to discharge the surface warm water after heat exchange. In this way, it can be ensured that the power generation system 1 can effectively use the surface warm water to evaporate the circulating working fluid to ensure the reliable performance of temperature difference energy power generation.

[0042] Optionally, in one embodiment, the condenser 15 is also connected to a cold water pipe 152 and a second drain pipe 151. A cold water pump 153 is provided on the cold water pipe 152. The cold water pump 153 is used to pump deep cold water in the water area to the condenser 15, so that the condenser 15 can use the deep cold water in the water area to liquefy the circulating medium flowing through the condenser 15. The second drain pipe 151 is used to discharge the deep cold water after heat exchange. In this way, it can be ensured that the power generation system 1 can effectively use the deep cold water to cool the circulating medium, so as to ensure the reliable performance of temperature difference energy power generation.

[0043] In one embodiment, Figure 1 and Figure 2As shown, the energy storage unit 21 includes a compressor 212 and a compression heat exchanger 215. The compressor 212, the compression heat exchanger 215 and the gas storage device 25 are sequentially connected through a compression pipeline 214 to form a compression channel. The compression pipeline 214 between the compression heat exchanger 215 and the gas storage device 25 is provided with a first conduction valve 214a, and the first conduction valve 214a is used to control the on-off of the compression channel. The compression heat exchanger 215 is arranged in parallel with the evaporator 11 through a first connecting pipe 215a. The first connecting pipe 215a is provided with a first connecting valve 215b. The connecting valve 215b is used to control the opening and closing of the first connecting pipe 215a; in the energy storage mode, the first conducting valve 214a and the first connecting valve 215b are both conducting, the compressor 212 can compress the air driven by the motor 211, and the compressed air can be stored in the gas storage device 25 through the compression heat exchanger 215, the circulation pump 16 can make the liquid circulating medium flow into the evaporator 11 and the compression heat exchanger 215 at the same time, and the compression heat exchanger 215 can make the compressed air and the liquid circulating medium exchange heat to vaporize the circulating medium. In this way, during the low-load period of electric energy, the energy storage and release system can be set in the energy storage mode to achieve the energy storage effect. Specifically, the first connecting valve 215b and the first conducting valve 214a can be opened so that when the motor 211 is started to drive the compressor 212, the compressor 212 can inhale air and compress the air, thereby increasing the air pressure and temperature of the air flowing out of the compressor 212, so that when the compressed air is cooled by the compression heat exchanger 215 and stored in the air storage device 25, the high-pressure compressed air can be used to store electric energy. Among them, since the compression heat exchanger 215 can be arranged in parallel with the evaporator 11 through the first connecting pipe 215a, and in the energy storage mode, the first connecting valve 215b in the first connecting pipe 215a is connected, the liquid circulating medium can flow into the compression heat exchanger 215 and the evaporator 11 at the same time under the action of the circulation pump 16, so that the compression heat exchanger 215 can use the heat carried by the compressed air to heat and vaporize the circulating medium, so as to heat and vaporize the circulating medium together with the evaporator 11, improve the efficiency of the circulating medium vaporization, and improve the energy conversion rate when the compressed air is stored. Therefore, the energy system 100 can achieve the coupling of temperature difference energy generation and compressed air energy storage and release system by connecting the compression heat exchanger 215 and the evaporator 11 in parallel, thereby improving the energy conversion rate within the energy system 100 and effectively avoiding energy waste.

[0044] When the gas storage device 25 reaches the maximum gas storage capacity, the motor 211 stops, and the first connecting valve 215b and the first conducting valve 214a are closed to stop energy storage, thereby ensuring the safety and reliability of the gas storage device 25.

[0045] Further, in one embodiment, if Figure 1 and Figure 2As shown, the energy release unit 22 includes an expander 222 and an expansion heat exchanger 224. The expander 222, the expansion heat exchanger 224 and the gas storage device 25 are sequentially connected through an expansion pipe 225 to form an expansion channel. The expansion pipe 225 between the expansion heat exchanger 224 and the gas storage device 25 is provided with a second conduction valve 225a, and the second conduction valve 225a is used to control the on-off of the expansion channel. The expansion heat exchanger 224 is arranged in parallel with the condenser 15 through a second connecting pipe 224a. The second connecting pipe 224a is provided with a second connecting valve 224b, and the second connecting valve 224b is used to control the second The connecting pipe 224a is turned on and off; in the energy release mode, the second conduction valve 225a and the second connecting valve 224b are both turned on, the air in the gas storage device 25 can flow out of the gas storage device 25 and flow through the expansion heat exchanger 224 and the expander 222 in sequence, the vaporous circulating working fluid flowing out of the turbine 12 can flow into the condenser 15 and the expansion heat exchanger 224 at the same time, the expansion heat exchanger 224 can make the compressed air and the vaporized circulating working fluid exchange heat to liquefy the circulating working fluid, and the expander 222 can drive the expansion generator 221 to rotate to generate electricity under the expansion work of the compressed air. In this way, during the peak period of electric energy load, the energy storage and release system can be set in the energy release mode to achieve the power generation effect. Specifically, the second connecting valve 224b and the second conducting valve 225a can be opened to allow the compressed air to flow out from the gas storage device 25 and flow into the expander 222 after absorbing heat through the expansion heat exchanger 224, so that the expander 222 can drive the expansion generator 221 to rotate under the expansion work of the compressed air after absorbing heat, so as to achieve energy release and power generation. Among them, since the expansion heat exchanger 224 can be arranged in parallel with the condenser 15 through the second connecting pipe 224a, and in the energy release mode, the second connecting valve 224b in the second connecting pipe 224a is connected, the gaseous circulating medium can flow into the expansion heat exchanger 224 and the condenser 15 at the same time, so that the compression heat exchanger 215 can use the thermal energy of the circulating medium to heat the compressed air, so as to cool the liquefied circulating medium together with the condenser 15, thereby improving the efficiency of the liquefaction of the circulating medium and improving the energy conversion rate when the temperature difference energy is used for power generation. Therefore, the energy system 100 can achieve the coupling of temperature difference energy generation and compressed air energy storage and release system by connecting the expansion heat exchanger 224 and the condenser 15 in parallel, so as to improve the energy conversion rate within the energy system 100 and effectively avoid energy waste.

[0046] Among them, Figure 1 and Figure 2As shown, after the peak of the electric energy load, the second connecting valve 224b and the second conducting valve 225a are closed to end the energy release process. In addition, when the energy storage and release system is in the energy storage mode, the cold water pump 153, the warm water pump 113, the circulating pump 16, the first connecting valve 215b and the first conducting valve 214a are in an open state, and the second connecting valve 224b and the second conducting valve 225a are both in a closed state, so that the power generation system can generate electricity using the temperature difference energy, and the energy storage and release system can also effectively store electric energy through the energy storage unit; when the energy storage and release system is in the energy release mode, the warm water pump 113, the cold water pump 153, the circulating pump 16, the first connecting valve 215b and the first conducting valve 214a are all in a closed state, and the second connecting valve 224b and the second conducting valve 225a are in a closed state, so that the power generation system can generate electricity using the temperature difference energy, and the energy storage and release system can also effectively generate electricity outward through the energy release unit. Therefore, the energy system 100 can flexibly and effectively adjust its working state according to the power load situation.

[0047] Further, in one embodiment, if Figure 1 and Figure 2As shown, the number of compressors 212 is at least two, and at least two compressors 212 are sequentially connected with the compression heat exchanger 215 and the gas storage device 25 through the compression pipeline 214 to form a compression channel. The energy storage unit 21 also includes at least one cooling heat exchanger 213, and a cooling heat exchanger 213 is connected between two adjacent compressors 212, and each cooling heat exchanger 213 has a first cold port and a first hot port that are connected. The number of expanders 222 is at least two, and at least two expanders 222 are sequentially connected with the expansion heat exchanger 224 and the gas storage device 25 through the expansion pipeline 225 to form an expansion channel. The energy release unit 22 also includes at least one heating heat exchanger 223, and a heating heat exchanger 223 is connected between two adjacent compressors 212, and each heating heat exchanger 223 has a second cold port and a second hot port that are connected. The energy storage and release system also includes a heat storage tank 24 and a cold storage tank 23, each first cold port is connected to the output port of the cold storage tank 23, each second cold port is connected to the input port of the cold storage tank 23, each first hot port is connected to the input port of the heat storage tank 24, and each second hot port is connected to the output port of the heat storage tank 24. The heat storage tank 24 is used to store high-temperature energy storage medium, and the cold storage tank 23 is used to store low-temperature energy storage medium. In the energy storage mode, at least two compressors 212 can compress the air in stages under the drive of the motor 211, and the cooling heat exchanger 213 located between two adjacent compressors 212 can make the low-temperature energy storage medium and the air compressed by the previous stage compressor 212 exchange heat; in the energy release mode, at least two expanders 222 can expand the compressed air in stages to drive the expansion generator 221 to rotate and generate electricity, and the heating heat exchanger 223 located between two adjacent expanders 222 can make the high-temperature energy storage medium and the air discharged by the previous stage expander 222 exchange heat. In this way, the energy storage and release system can achieve staged compression and staged expansion through multiple compressors 212 and multiple expanders 222, thereby improving conversion efficiency and enhancing system stability and safety. Among them, since a cooling heat exchanger 213 is arranged between two adjacent compressors 212, and a heating heat exchanger 223 is arranged between two adjacent expanders 222, and the cooling heat exchanger 213 and the heating heat exchanger 223 are both connected to the cold storage tank 23 for storing low-temperature energy storage working fluid and the heat storage tank 24 for storing high-temperature energy storage working fluid to form an energy storage channel for the circulation of the energy storage working fluid, so in the process of staged compression of multiple compressors, when the low-temperature energy storage working fluid flows out of the cold storage tank 23 and flows into the cooling heat exchanger 213, the cooling heat exchanger 213 can make the low-temperature energy storage working fluid exchange heat with the compressed air discharged from the previous stage compressor 212, so that the compressed air can achieve inter-stage cooling, thereby avoiding the compression efficiency reduction due to excessively high air temperature; it also enables the low-temperature energy storage working fluid to flow into the heat storage tank 24 after heating and storing energy, so as to achieve thermal storage.Then, when the compressed air flows out from the gas storage device 25 and is expanded in stages in multiple expanders, the high-temperature energy storage medium can flow out from the heat storage tank 24 and flow into the heating heat exchanger 223, so that the heating heat exchanger 223 can exchange heat between the high-temperature energy storage medium and the air discharged from the previous stage expansion machine 222, so as to release the thermal energy stored in the energy storage medium into the air again, thereby ensuring the reliable staged expansion of the compressed air and the energy conversion efficiency of the compressed air energy storage system; at the same time, it also allows the energy storage medium after cooling and releasing energy to flow into the cold storage tank 23 for the next cycle.

[0048] Schematically, the energy storage medium can be molten salt or water.

[0049] Indicatively, Figure 1 and Figure 2 As shown, all compressors 212 are coaxially arranged with the motor 211 ; all expanders 222 are coaxially arranged with the expansion generator 221 .

[0050] Optionally, in one embodiment, Figure 1 and Figure 2 As shown, the number of compressors 212 and the number of expanders 222 are both two, and the number of heating heat exchangers 223 and cooling heat exchangers 213 are both one. In this way, the energy storage and release effects can be improved by means of staged compression and staged expansion, and the structure of the entire energy system 100 can be effectively simplified to reduce costs.

[0051] In one embodiment, Figure 1 and Figure 2As shown, the air storage device 25 is used to be set under the water surface h0 of the water area. The air storage device 25 includes an air storage box 251. The air storage box 251 is formed with an air storage cavity 251a with an opening. The opening of the air storage cavity 251a is used to face away from the water surface h0. The air storage cavity 251a is used to store the air compressed by the energy storage unit 21; the energy storage and release system also includes a pressure regulating unit 26 and a pressure sensor 27. The pressure sensor 27 is arranged in the air storage cavity 251a. The pressure sensor 27 is used to detect the pressure of the air in the air storage cavity 251a. The pressure regulating unit 26 is connected to the air storage box 251. When the pressure value detected by the pressure sensor 27 is not equal to the predetermined pressure value, the pressure regulating unit 26 can adjust the depth of the air storage box 251 in the water according to the pressure value detected by the pressure sensor 27. Among them, since the gas storage device 25 is set in the water, the gas storage chamber 251a is inverted in the water so that the opening of the gas storage chamber 251a faces away from the water surface h0, when gas is stored in the gas storage chamber 251a, the pressure of the gas in the gas storage chamber 251a is balanced with the water pressure at the depth of the current gas storage tank 251. Therefore, when gas is injected into the gas storage chamber 251a, the gas can press the water in the gas storage chamber 251a out from the opening of the gas storage chamber 251a so that the gas pressure in the gas storage chamber 251a is balanced with the water pressure; when the gas in the gas storage chamber 251a is released outward, water can enter the gas storage chamber 251a from the opening of the gas storage chamber 251a so that the gas pressure in the gas storage chamber 251a is balanced with the current water pressure. Therefore, when the water surface h0 rises and falls, causing the depth of the gas storage tank 251 to change, the pressure of the gas in the gas storage chamber 251a will change with the change of the depth of the gas storage tank 251. In this way, since the pressure sensor 27 can effectively detect the pressure value of the air in the air storage chamber 251a, the pressure sensor 27 can determine whether the current pressure value deviates from the predetermined pressure value, that is, the detection result of the pressure sensor 27 can determine whether the current depth of the air storage tank 251 is consistent with the design depth, so that when there is a deviation between the detected pressure value and the predetermined pressure value, the pressure regulating unit 26 can maintain the air storage tank 251 at the designed depth by adjusting the depth of the air storage tank 251 in the water to achieve constant pressure storage and release of the air storage tank 251, that is, to ensure that the pressure of the gas in the air storage chamber 251a is the same as the predetermined pressure value, so that when the energy storage and release system is working, both the energy storage unit 21 and the energy release unit 22 can work under the design conditions corresponding to the predetermined pressure value, thereby effectively improving the efficiency of the energy system 100.

[0052] Illustratively, the predetermined pressure value may be set according to specific design requirements, or may be set according to rated operating conditions of the compressor 212 and the expander 222 .

[0053] Further, in one embodiment, if Figure 1 and Figure 2As shown, the pressure regulating unit 26 includes a base 261, a guide rail 262 and a lifting assembly 263. The base 261 is used to be fixed on the bottom of the water area h1. One end of the guide rail 262 is connected to the base 261, and the other end is used to extend to the side close to the water surface h0. The air storage tank 251 is slidably connected to the guide rail 262, and the lifting assembly 263 is connected to the air storage tank 251. When the pressure value detected by the pressure sensor 27 is greater than the predetermined pressure value, the lifting assembly 263 can drive the air storage tank 251 to move along the guide rail 262 to the side away from the base 261; when the pressure value detected by the pressure sensor 27 is less than the predetermined pressure value, the lifting assembly 263 can drive the air storage tank 251 to move along the guide rail 262 to the side close to the base 261; the air storage device 25 also includes a brake assembly 252 arranged on the air storage tank 251, and the brake assembly 252 is used to lock the air storage tank 251 and the guide rail 262. In this way, when the water surface h0 rises and falls and the pressure sensor 27 detects a deviation between the pressure value and the predetermined pressure value, the lifting assembly 263 can effectively drive the gas storage tank 251 to rise or fall along the guide rail 262 to adjust the pressure in the gas storage chamber 251a, so as to achieve constant pressure gas storage and release of the gas storage tank 251, thereby ensuring the efficiency of the energy system 100. Among them, the setting of the guide rail 262 can ensure that when the lifting assembly 263 drives the gas storage tank 251 to move, the gas storage tank 251 can be maintained in a state of being inverted in the water, so that the gas storage tank 251 can stably and effectively store gas. The setting of the brake assembly 252 ensures that after the pressure adjustment is completed, the gas storage tank 251 can be maintained at the designed depth at the brake position of the brake assembly 252, so as to ensure that the gas storage tank 251 can store and release gas at a constant pressure, thereby ensuring the efficiency of the energy system 100.

[0054] Indicatively, Figure 1 and Figure 2 As shown, the number of guide rails 262 can be multiple, and the multiple guide rails 262 are arranged at intervals along the outer periphery of the air storage box 251, and the air storage box 251 is slidably connected to each guide rail 262. Preferably, the number of guide rails 262 is two, and the two guide rails 262 are respectively arranged on both sides of the air storage box 251. Further, the extension direction of the guide rail 262 is the vertical direction, so that when the lifting assembly 263 drives the air storage box 251 to slide along the guide rail 262, the depth of the air storage box 251 can be quickly adjusted.

[0055] Schematically, the number of brake assemblies 252 can be multiple, and each guide rail 262 can be locked and matched with multiple brake assemblies 252. For example, each guide rail 262 can be locked and matched with two brake assemblies 252. Preferably, the number of guide rails 262 is two, and the two guide rails 262 are respectively arranged on both sides of the air storage box 251. The number of brake assemblies 252 is four, wherein two brake assemblies 252 are used to lock and match with one of the two guide rails 262, and the other two brake assemblies 252 are used to lock and match with the other guide rail 262, and the two brake assemblies locked and matched with the same guide rail 262 are arranged at intervals along the extension direction of the guide rail 262.

[0056] Illustratively, the brake assembly 252 may include a clamping caliper.

[0057] Illustratively, in one embodiment, the lifting assembly 263 may include a first pull rope, a second pull rope, a first reel and a second reel, one end of the first pull rope is connected to the side of the gas storage box 251 away from the base 261, and the other end is connected to the first reel, the first reel can reel or release the first pull rope to drive the gas storage box 251 to move along the guide rail 262 to the side away from the base 261, one end of the second pull rope is connected to the side of the gas storage box 251 close to the base 261, and the other end is connected to the second reel, the second reel can reel or release the second pull rope to drive the gas storage box 251 to move along the guide rail 262 to the side close to the base 261. In another embodiment, the lifting assembly 263 may also include a spring connected between the gas storage tank and the base 261, so that during the energy storage and release process, the gas pressure in the gas storage tank is kept constant due to the mechanical negative feedback of the spring.

[0058] Further, in one embodiment, if Figure 1 and Figure 2As shown, the air storage box 251 is formed with a sealed water storage space 251b and a water suction port connected to the water storage space 251b, the water storage space 251b is used to store water, the cold water pipe 152 includes a first cold water section 152a and a second cold water section 152b connected to each other, the end of the first cold water section 152a away from the second cold water section 152b is connected to the condenser 15, and the cold water pump 153 is arranged in the first cold water section 152a. The deep cold water in the water area can be sucked to the condenser 15 through the second cold water section 152b. The second cold water section 152b is provided with a cold water valve 154 for controlling the on and off of the second cold water section 152b. The lifting component 263 includes a water suction valve 2633, a pumping valve 2632 and a pumping pipe 2631. The water suction valve 2633 is provided at the water suction port. The water suction valve 2633 is used to open or close the water suction port. One end of the pumping pipe 2631 is connected to the water storage air The first end of the cold water valve 154 is connected to the water storage space 251b, and the other end is connected to one end of the first cold water section 152a close to the second cold water section 152b. The pumping valve 2632 is arranged on the pumping pipe 2631, and the pumping valve 2632 is used to control the on-off of the pumping pipe 2631; when the pressure value detected by the pressure sensor 27 is greater than the predetermined pressure value, the cold water valve 154 and the pumping valve 2632 are both opened, the suction valve 2633 is closed, and the cold water pump 153 sucks the water stored in the water storage space 251b through the suction pipe 2631 to drive the air storage box 251 to move along the guide rail 262 to the side away from the base 261; when the pressure value detected by the pressure sensor 27 is less than the predetermined pressure value, the cold water valve 154 and the suction valve 2633 are both opened, the pumping valve 2632 is closed, and the water storage space 251b sucks water through the suction port to drive the air storage box 251 to move along the guide rail 262 to the side close to the base 261. In this way, when the water surface h0 rises and falls and the pressure value detected by the pressure sensor 27 deviates from the predetermined pressure value, the air storage tank 251 can adjust the sinking depth with the cooperation of the water suction valve 2633, the water pumping valve 2632, the water pumping pipe 2631, the cold water valve 154 and the cold water pump 153. Specifically, when the water surface h0 rises and the pressure value detected by the pressure sensor 27 is greater than the predetermined pressure value, the water suction valve 2633 is maintained in a closed state, the cold water valve 154 and the water pumping valve 2632 are opened and the openings of the cold water valve 154 and the water pumping valve 2632 are adjusted so that when the cold water pump 153 is working, the cold water pump 153 can not only suck deep cold water to cool the liquefied circulating medium, but also pump out the water in the water storage space 251b to achieve the slow floating of the air storage tank 251 along the guide rail 262. During this process, the pressure sensor 27 continuously detects the air pressure value in the air storage chamber 251a. When the detected pressure value reaches the predetermined pressure value, the brake assembly 252 locks the air storage box 251 and the guide rail 262, and closes the pumping valve 2632, so that the air storage box 251 can be stabilized at the designed depth, and the pressure of the compressed air in the air storage box 251 is the designed value.When the water surface h0 drops and the pressure value detected by the pressure sensor 27 is less than the predetermined pressure value, the cold water valve 154 and the cold water pump 153 are maintained in an open state, so that the cold water pump 153 can draw deep cold water to cool the liquefied circulating medium. At the same time, the water suction valve 2633 is opened and the pumping valve 2632 is closed, so that the water storage space 251b can draw water through the water suction port under the action of negative pressure, so as to achieve the slow descent of the air storage tank 251 along the guide rail 262. During this process, the pressure sensor 27 continuously detects the air pressure value in the air storage cavity 251a. When the detected pressure value reaches the predetermined pressure value, the brake assembly 252 locks the air storage tank 251 and the guide rail 262, and closes the water suction valve 2633, so that the air storage tank 251 can be stabilized at the designed depth, and the pressure of the compressed air in the air storage tank 251 is the designed value. In the process of pumping water outward to raise the air tank 251, the cold water valve 154 and the pumping valve 2632 are controlled to be opened at the same time, which can not only ensure that the working process of the power generation system 1 is not affected when the air tank 251 is drained and adjusted to a deeper level, but also slow down the rising speed of the air tank 251 by slowing down the drainage speed, so as to ensure that when the pressure sensor 27 detects that the pressure value is consistent with the predetermined pressure value, the brake assembly 252 can lock the air tank 251 in time.

[0059] Furthermore, if Figure 1 and Figure 2 As shown, after the air storage tank 251 is locked to the design depth, the water level in the water storage space 251b can be adjusted by pumping water into the water storage space 251b to change the total gravity of the air storage tank 251, so that the air storage tank 251 can maintain a suspended state where the buoyancy is equal to the gravity at the design depth. Specifically, since the total displacement of the air storage tank 251 and its own gravity remain unchanged when the air storage tank 251 is submerged in the water, the gravity of the water required in the suspended state can be calculated according to the calculation formula that the buoyancy is equal to the total gravity, so that the suspended water level in the water storage space 251b in the suspended state can be obtained. Therefore, when the water level in the water storage space 251b is higher than the suspended water level at the design depth, the water level in the water storage space 251b can be adjusted to the suspended water level by closing the water suction valve 2633, opening the pumping valve 2632 and the cold water valve 154, and adjusting the opening of the pumping valve 2632 and the cold water valve 154. When the water level in the water storage space 251b is lower than the suspension water level at the design depth, the water level in the water storage space 251b can be adjusted to the suspension water level by closing the pumping valve 2632 and opening the suction valve 2633. When the air storage box 251 is maintained in a suspended state at the design depth, it is beneficial to reduce the structural pressure of the air storage device 25, and at the same time, the brake assembly 252 can be in a state without stress, which is beneficial to ensure the structural strength.

[0060] In addition, if Figure 1 and Figure 2 As shown, the energy storage and release system also has a pressure regulating mode and a maintenance mode, wherein, in the pressure regulating mode, the pressure regulating unit 26 can adjust the depth of the air storage tank 251 in the water according to the pressure value detected by the pressure sensor 27, so that the air storage tank 251 can achieve constant pressure storage and release of gas. Please refer to the above description for details, which will not be repeated here. In the maintenance mode, the pressure regulating unit 26 can make the air storage tank 251 float to the water surface h0, so as to conduct a comprehensive inspection and maintenance of the gas storage device 25 on a regular basis. Specifically, the water suction valve 2633 is closed, the water pumping valve 2632 is opened, and all the water in the water storage space 251b is pumped out by the cold water pump 153, so that the air storage tank 251 can float to the water surface h0 along the guide rail 262 under the action of buoyancy. Among them, in order to enable the energy system to achieve the effect of constant pressure storage and release of energy, the pressure regulating mode can be executed before turning on the energy storage mode and the energy release mode.

[0061] Optionally, the evaporator 11, turbine 12, condenser 15, circulating pump 16, energy storage unit 21 and energy release unit 22 in the energy system 100 can be arranged on land near water, such as offshore land, while the gas storage device 25 and pressure regulating unit 26 and other components related to pumping water in the energy system 100 are arranged in the water area, which makes the energy system 100 applicable to working conditions such as coastal areas or isolated islands. Alternatively, the energy system 100 can also include an above-water platform, wherein the above-water platform can be arranged on the surface of the water area, and the above-water platform can support equipment such as the evaporator 11, turbine 12, condenser 15, circulating pump 16, energy storage unit 21 and energy release unit 22, so that the energy system can be arranged offshore and is applicable to offshore areas or offshore coastal areas.

[0062] Further, in one embodiment, if Figure 2 As shown, the energy system 100 also includes an above-water platform 3, which is arranged above the water surface h0 of the water area, and the end of the guide rail 262 away from the base 261 is connected to the above-water platform 3, and the evaporator 11, turbine 12, condenser 15, circulation pump 16, energy storage unit 21 and energy release unit 22 are all arranged on the above-water platform 3. In this way, the above-water platform 3 used for production activities can be combined with the power generation system 1 and the energy storage and release system, so that the energy system 100 can effectively guarantee the production electricity of the above-water platform. When the offshore platform carries out production activities, the power generation system is in the on state to continuously supply power to the offshore platform. In addition, when the power consumption is at a peak, the energy storage and release system turns on the energy release mode to ensure the production electricity of the platform. When the power consumption is low, the energy storage and release system turns on the energy storage mode to store surplus electric energy, thereby balancing the power consumption and power generation.

[0063] The present application also provides a control method of an energy system 100, which is implemented by using the energy system 100 in any of the above embodiments, and includes the following steps:

[0064] The circulating pump 16 drives the circulating medium to circulate in the power generation channel. The evaporator 11 uses the surface warm water in the water area to vaporize the circulating medium flowing through the evaporator 11. The turbine 12 drives the generator 13 to rotate under the action of the vaporized circulating medium to generate electric energy. The condenser 15 uses the deep cold water in the water area to liquefy the circulating medium flowing through the condenser 15.

[0065] When the electric energy load is low, the energy storage and release system enters the energy storage mode, the energy storage unit 21 compresses the air and stores the compressed air in the air storage device 25, and the energy storage unit 21 and the evaporator 11 jointly vaporize the circulating working fluid;

[0066] When the power load is at its peak, the energy storage and release system enters the energy release mode, and the energy release unit 22 uses the air stored in the gas storage device 25 to expand and generate electricity, and the energy release unit 22 and the condenser 15 jointly liquefy the circulating working fluid.

[0067] In the above control method, when the circulating pump drives the circulating working fluid to circulate in the power generation channel, the evaporator 11 can heat the circulating working fluid under the action of the surface warm water to vaporize the circulating working fluid, so that when the vaporized circulating working fluid flows through the turbine 12, it can drive the turbine 12 to do work to drive the generator 13 to generate electricity, and the circulating working fluid flowing out of the turbine 12 to the condenser 15 can be cooled and liquefied under the action of deep cold water, so that the liquefied circulating working fluid can be pumped into the evaporator 11 again under the action of the circulating pump 16 for a new circulation, so the power generation system 1 can utilize the temperature difference between the surface warm water and the deep cold water to achieve sustainable power supply. Furthermore, when the energy storage and release system is in the energy storage mode, the energy storage unit 21 can compress air and store the compressed air in the gas storage device 25 to realize the storage of electric energy; and when the energy storage and release system is in the energy release mode, the energy release unit 22 can utilize the expansion of the air stored in the gas storage device 25 to do work to generate electricity. Therefore, the energy storage and release system can store energy during the off-peak period of electric energy load and release energy during the peak period of electric energy load by switching between the energy storage mode and the energy release mode, thereby balancing electricity consumption and power generation, and ensuring the flexibility and adaptability of the energy system 100. Among them, in the energy storage mode, the energy storage unit 21 can utilize the heat generated by the compressed air to heat and vaporize the circulating working fluid together with the evaporator 11; in the energy release mode, the energy release unit 22 can utilize the energy absorption of the compressed gas to cool and liquefy the circulating working fluid together with the condenser 15. Therefore, when the energy storage and release system is in the energy storage mode, the energy system 100 can improve the energy conversion efficiency of compressed air energy storage by coupling the energy storage unit 21 with the evaporator 11; when the energy storage and release system is in the energy release mode, the energy system 100 can improve the energy conversion efficiency of temperature difference energy generation by coupling the energy release unit 22 with the condenser 15.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An energy system (100), characterized in that: include: A power generation system (1), the power generation system (1) comprising an evaporator (11), a turbine (12), a condenser (15) and a circulating pump (16), the evaporator (11), the turbine (12), the condenser (15) and the circulating pump (16) being cyclically connected in sequence through a working medium pipeline (14) to form a power generation channel for circulating working medium to circulate, the circulating pump (16) being used to drive the circulating working medium to circulate in the power generation channel, the evaporator (11) being able to utilize surface warm water in a water area to vaporize the circulating working medium flowing through the evaporator (11), the turbine (12) being able to drive the generator (13) to rotate under the action of the vaporized circulating working medium to generate electric energy, and the condenser (15) being able to utilize deep cold water in the water area to liquefy the circulating working medium flowing through the condenser (15); An energy storage and release system, the energy storage and release system comprising a gas storage device (25), an energy storage unit (21) and an energy release unit (22), the gas storage device (25) and the energy storage unit (21) and the energy release unit (22) are all connected through pipelines, the energy storage and release system has an energy storage mode and an energy release mode, in the energy storage mode, the energy storage unit (21) can compress air and store the compressed air in the gas storage device (25), and the energy storage unit (21) can vaporize the circulating working fluid together with the evaporator (11); in the energy release mode, the energy release unit (22) can use the air stored in the gas storage device (25) to expand and perform work to generate electricity, and the energy release unit (22) can liquefy the circulating working fluid together with the condenser (15).

2. The energy system (100) according to claim 1, characterized in that: The energy storage unit (21) comprises a compressor (212) and a compression heat exchanger (215); the compressor (212), the compression heat exchanger (215) and the gas storage device (25) are connected in sequence via a compression pipe (214) to form a compression channel; the compression pipe (214) between the compression heat exchanger (215) and the gas storage device (25) is provided with a first conduction valve (214a); the first conduction valve (214a) is used to control the on-off of the compression channel; the compression heat exchanger (215) is connected in parallel with the evaporator (11) via a first connecting pipe (215a); the first connecting pipe (215a) is provided with a first connecting valve (214a); 15b), the first connecting valve (215b) is used to control the on-off of the first connecting pipe (215a); in the energy storage mode, the first conducting valve (214a) and the first connecting valve (215b) are both conducting, the compressor (212) can compress air under the drive of the motor (211), and the compressed air can be stored in the air storage device (25) through the compression heat exchanger (215), the circulation pump can make the liquid circulating medium flow into the evaporator and the compression heat exchanger at the same time, and the compression heat exchanger (215) can make the compressed air and the liquid circulating medium perform heat exchange to vaporize the circulating medium.

3. The energy system (100) according to claim 2, characterized in that: The energy release unit (22) comprises an expansion machine (222) and an expansion heat exchanger (224); the expansion machine (222), the expansion heat exchanger (224) and the gas storage device (25) are connected in sequence via an expansion pipe (225) to form an expansion channel; the expansion pipe (225) between the expansion heat exchanger (224) and the gas storage device (25) is provided with a second conduction valve (225a); the second conduction valve (225a) is used to control the on-off of the expansion channel; the expansion heat exchanger (224) is connected in parallel with the condenser (15) via a second connecting pipe (224a); the second connecting pipe (224a) is provided with a second connecting valve (224b); the second connecting valve (22 4b) is used to control the on / off of the second connecting pipe (224a); in the energy release mode, the second conduction valve (225a) and the second connecting valve (224b) are both conducted, the air in the gas storage device (25) can flow out of the gas storage device (25) and flow through the expansion heat exchanger (224) and the expander (222) in sequence, the vaporous circulating working fluid flowing out of the turbine can flow into the condenser and the expansion heat exchanger at the same time, the expansion heat exchanger (224) can make the compressed air and the vaporous circulating working fluid exchange heat to liquefy the circulating working fluid, and the expander (222) can drive the expansion generator (221) to rotate to generate electricity under the expansion work of the compressed air.

4. The energy system (100) according to claim 3, characterized in that: The number of the compressors (212) is at least two, and the at least two compressors (212) are connected in sequence with the compression heat exchanger (215) and the gas storage device (25) through the compression pipeline (214) to form the compression channel. The energy storage unit (21) further includes at least one cooling heat exchanger (213), and one cooling heat exchanger (213) is connected between two adjacent compressors (212). Each cooling heat exchanger (213) has a first cold port and a first hot port that are connected. The number of the expanders (222) is at most At least two of the expansion machines (222) are connected in sequence with the expansion heat exchanger (224) and the gas storage device (25) through an expansion pipe (225) to form the expansion channel; the energy release unit (22) further comprises at least one heating heat exchanger (223); two adjacent compressors (212) are connected with one heating heat exchanger (223); each heating heat exchanger (223) has a second cold port and a second hot port that are connected; the energy storage and release system further comprises a heat storage tank (24) and a cold storage tank (23); each of the first cold storage tanks (24) and the cold storage tanks (23) are connected to each other; Each of the second cold ports is communicated with the output port of the cold storage tank (23), each of the second cold ports is communicated with the input port of the cold storage tank (23), each of the first hot ports is communicated with the input port of the heat storage tank (24), each of the second hot ports is communicated with the output port of the heat storage tank (24), the heat storage tank (24) is used to store high-temperature energy storage medium, the cold storage tank (23) is used to store low-temperature energy storage medium, and in the energy storage mode, at least two of the compressors (212) are capable of performing staged compression on air driven by the motor (211), and are located adjacent to each other. The cooling heat exchanger (213) between the two compressors (212) can allow the low-temperature energy storage medium to exchange heat with the air compressed by the previous stage compressor (212); in the energy release mode, at least two expanders (222) can perform staged expansion on the compressed air to drive the expansion generator (221) to rotate and generate electricity, and the heating heat exchanger (223) located between the two adjacent expanders (222) can allow the high-temperature energy storage medium to exchange heat with the air discharged by the previous stage expander (222).

5. The energy system (100) according to any one of claims 1 to 4, characterized in that: The evaporator (11) is also connected to a warm water pipe (112) and a first drain pipe (111). A warm water pump (113) is provided on the warm water pipe (112). The warm water pump (113) is used to extract surface warm water in the water area to the evaporator (11), so that the evaporator can use the surface warm water in the water area to vaporize the circulating working fluid flowing through the evaporator. The first drain pipe (111) is used to discharge the surface warm water after heat exchange. And / or, the condenser (15) is further connected to a cold water pipe (152) and a second drain pipe (151); a cold water pump (153) is provided on the cold water pipe (152); the cold water pump (153) is used to pump deep cold water in the water area to the condenser (15), so that the condenser can use the deep cold water in the water area to liquefy the circulating working fluid flowing through the condenser; and the second drain pipe (151) is used to discharge the deep cold water after heat exchange.

6. The energy system (100) according to claim 5, characterized in that: The gas storage device (25) is used to be arranged below the water surface (h0) of the water area, the gas storage device (25) comprising a gas storage box (251), the gas storage box (251) forming a gas storage cavity (251a) with an opening, the opening of the gas storage cavity (251a) being used to face away from the water surface (h0), the gas storage cavity (251a) being used to store air compressed by the energy storage unit (21); the energy storage and release system further comprises a pressure regulating unit (26) and a pressure sensor (27), the pressure sensor (27) being arranged in the gas storage cavity (251a), the pressure sensor (27) being used to detect the pressure of the air in the gas storage cavity (251a), the pressure regulating unit (26) being connected to the gas storage box (251), and when the pressure value detected by the pressure sensor (27) is not equal to a predetermined pressure value, the pressure regulating unit (26) can adjust the depth of the gas storage box (251) in the water according to the pressure value detected by the pressure sensor (27).

7. The energy system (100) according to claim 6, characterized in that: The pressure regulating unit (26) comprises a base (261), a guide rail (262) and a lifting assembly (263); the base (261) is used to be fixed on the bottom (h1) of the water area; one end of the guide rail (262) is connected to the base (261), and the other end is used to extend toward a side close to the water surface (h0); the air storage tank (251) is slidably connected to the guide rail (262); the lifting assembly (263) is connected to the air storage tank (251); when the pressure value detected by the pressure sensor (27) is greater than the predetermined pressure value, the lifting assembly (263) is moved upward. 63) can drive the gas storage box (251) to move along the guide rail (262) to a side away from the base (261); when the pressure value detected by the pressure sensor (27) is less than the predetermined pressure value, the lifting component (263) can drive the gas storage box (251) to move along the guide rail (262) to a side close to the base (261); the gas storage device (25) further includes a brake component (252) arranged on the gas storage box (251), and the brake component (252) is used to lock the gas storage box (251) and the guide rail (262).

8. The energy system (100) according to claim 7, characterized in that: The air storage box (251) is formed with a sealed water storage space (251b) and a water intake port connected to the water storage space (251b); the water storage space (251b) is used to store water; the cold water pipe (152) comprises a first cold water section (152a) and a second cold water section (152b) which are connected to each other; an end of the first cold water section (152a) which is away from the second cold water section (152b) is connected to the condenser (15); the cold water pump (153) is arranged in the first cold water section (152a); the cold water pump (153) is capable of The second cold water section (152b) draws deep cold water in the water area to the condenser (15); the second cold water section (152b) is provided with a cold water valve (154) for controlling the on / off of the second cold water section (152b); the lifting component (263) comprises a water suction valve (2633), a pumping valve (2632) and a pumping pipe (2631); the water suction valve (2633) is provided at the water suction port; the water suction valve (2633) is used to open or close the water suction port; one end of the pumping pipe (2631) is connected to the water storage space (251 b), and the other end is connected to an end of the first cold water section (152a) close to the second cold water section (152b), the pumping valve (2632) is arranged on the pumping pipe (2631), and the pumping valve (2632) is used to control the on-off of the pumping pipe (2631); when the pressure value detected by the pressure sensor (27) is greater than the predetermined pressure value, the cold water valve (154) and the pumping valve (2632) are both opened, the suction valve (2633) is closed, and the cold water pump (153) is connected to the water pump (2631) through the pumping pipe (2631). The water stored in the water storage space (251b) is sucked to drive the air storage box (251) to move along the guide rail (262) to a side away from the base (261); when the pressure value detected by the pressure sensor (27) is less than the predetermined pressure value, the cold water valve (154) and the water suction valve (2633) are both opened, the water pumping valve (2632) is closed, and the water storage space (251b) sucks water through the water suction port to drive the air storage box (251) to move along the guide rail (262) to a side close to the base (261).

9. The energy system (100) according to claim 7, characterized in that: The energy system (100) further comprises an above-water platform (3), the above-water platform (3) being arranged above the water surface (h0) of the water area, the end of the guide rail (262) facing away from the base (261) being connected to the above-water platform (3), and the evaporator (11), the turbine (12), the condenser (15), the circulating pump (16), the energy storage unit (21) and the energy release unit (22) being all arranged on the above-water platform (3).

10. A method for controlling an energy system (100), implemented by using the energy system (100) according to any one of claims 1 to 9, characterized in that: The following steps are involved: The circulating pump (16) drives the circulating working medium to circulate in the power generation channel, the evaporator (11) uses the surface warm water in the water area to vaporize the circulating working medium flowing through the evaporator (11), the turbine (12) drives the generator (13) to rotate under the action of the vaporized circulating working medium to generate electric energy, and the condenser (15) uses the deep cold water in the water area to liquefy the circulating working medium flowing through the condenser (15); When the electric energy load is low, the energy storage and release system enters the energy storage mode, the energy storage unit (21) compresses air and stores the compressed air in the air storage device (25), and the energy storage unit (21) and the evaporator (11) jointly vaporize the circulating working fluid; When the electric energy load is at a peak, the energy storage and release system enters the energy release mode, the energy release unit (22) uses the air stored in the gas storage device (25) to expand and perform work to generate electricity, and the energy release unit (22) and the condenser (15) jointly liquefy the circulating working fluid.

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