A photovoltaic-storage-electricity-cooling integrated three-carbon cycle system and power generation / refrigeration method

Abstract

The present invention discloses an integrated solar-storage-electricity-cooling (CTC) cycle system and power generation / refrigeration method. The system comprises a concentrating module for collecting solar energy; a thermochemical heat storage module for directly receiving the solar energy collected by the concentrating module, storing the heat in a heat storage medium through a thermochemical reaction, and releasing it into the working fluid carbon dioxide; a compression power generation module for directly receiving the heat-carrying CTC from the thermochemical heat storage module for power generation and working fluid compression; and a compression refrigeration module for directly receiving the electricity generated by the compression power generation module and the compressed CTC for refrigeration. In the present invention, CTC acts as a heat storage / release, power generation, and refrigeration carrier, circulating directly between the different modules without the need for an intermediate heat exchanger for heat transfer, thereby improving the energy efficiency of the integrated solar-storage-electricity-cooling CTC cycle system.

Description

Technical Field

[0001] The present invention relates to a photovoltaic-storage-electricity-cooling integrated three-carbon cycle system, belonging to the technical field of new energy utilization in distributed cogeneration systems. Background Art

[0002] Renewable energy-cogeneration systems play an important role in exploring new energy utilization models, promoting the application of renewable energy, and optimizing the energy structure. However, there are still some limitations to renewable energy-cogeneration systems: (1) There is a large heat transfer temperature difference between the high-temperature solar collector and the heat storage fluid, which leads to significant irreversible exergy losses during the heat collection and heat transfer process; (2) Due to the limitations of the melting and boiling points of metals, the energy density of traditional molten salt heat storage is low, making it difficult to meet the flexible and changing needs of renewable energy heat storage; (3) The secondary heat exchange in the system increases the complexity of the structure, resulting in higher investment costs, while reducing the inlet temperature and causing serious energy losses. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: for a photovoltaic-storage-electricity-cooling integrated three-carbon cycle system, how to improve the overall operating energy efficiency of the system through direct heat transfer, flexible matching and multi-effect carrier structural design.

[0004] To solve the above technical problems, the present invention provides a photovoltaic-storage-electricity-cooling integrated three-carbon cycle system, comprising:

[0005] Concentrating modules, used to concentrate solar energy;

[0006] Thermochemical heat storage module directly receives the solar energy collected by the concentrating module, stores the heat energy in the heat storage medium through thermochemical reactions, and releases it into the working fluid carbon dioxide;

[0007] The compression power generation module directly receives the working fluid carbon dioxide carrying thermal energy from the thermochemical heat storage module for power generation and working fluid compression;

[0008] The compression refrigeration module directly receives the electricity generated by the compression power generation module and the compressed working fluid carbon dioxide for refrigeration.

[0009] The aforementioned integrated solar-storage-electricity-cooling three-carbon cycle system further includes:

[0010] The data acquisition module is connected to the focusing module, the thermochemical heat storage module, the compression power generation module, and the compression refrigeration module respectively, and is used to collect power and refrigeration data and control the operating parameters of each module.

[0011] In the aforementioned integrated solar-storage-electricity-cooling three-carbon cycle system, the concentrating module includes a heliostat, a concentrating lens bracket, a concentrating lens, and a reflector;

[0012] The heliostat is firmly placed on the ground through a heliostat bracket; the focusing lens bracket is installed at the center of the wall surface of the endothermic reactor of the thermochemical heat storage module, and a fixing block is provided on the focusing lens bracket; the focusing lens is fixed on the fixing block;

[0013] The condenser lens bracket comprises an upper bracket and a lower bracket which are symmetrically arranged, and a reflector is arranged on the inner wall surface of the bracket.

[0014] In the aforementioned integrated solar-storage-electricity-cooling three-carbon cycle system, the thermochemical heat storage module includes an endothermic reactor;

[0015] A lens is installed on the wall of the endothermic reactor to receive sunlight; the endothermic reactor is connected to the carbon dioxide storage tank, the magnesium oxide storage tank and the magnesium carbonate storage tank through the carbon dioxide pipeline, the magnesium oxide pipeline and the magnesium carbonate pipeline respectively, and finally connected to the heat release reactor at the end.

[0016] In the aforementioned integrated solar-storage-electricity-cooling three-carbon cycle system, in the compression power generation module, the outlet of the heat release reactor is connected to the centrifugal filter, turbine 1, the upper inlet of regenerator 1, and the upper inlet of regenerator 2 in sequence through a direct outflow pipe, and the upper outlet of regenerator 2 is connected to tee pipe 1 and valve 1 in sequence;

[0017] Tee pipe 1 and valve 1 separate the carbon dioxide into two parts: carbon dioxide 1 and carbon dioxide 2. Carbon dioxide 1 flows into compressor 1, and carbon dioxide 2 flows into the left inlet of the mixer. The lower outlet of the mixer is connected to cooler 1, compressor 2, cooler 2, and splitter in sequence. The outlet of compressor 1 is connected to the lower inlet of tee pipe 2. The left and right inlet of tee pipe 2 are connected to the lower inlet of the regenerator and the lower outlet of regenerator 2, respectively.

[0018] The outlet at the left end of the splitter is connected to compressor 3, and the outlet end of compressor 3 is connected to the inlet at the lower end of regenerator 2;

[0019] The outlet at the lower end of the regenerator is connected to the heat release reactor through turbine 2 and a direct inflow pipe;

[0020] In the compression refrigeration module, the mixer is connected to cooler 1, compressor 2, cooler 2 and splitter in sequence;

[0021] Valve 2 is placed at the right outlet of the diverter to restrict the flow of the working medium carbon dioxide directly into the compression power generation module or the compression refrigeration module;

[0022] The right end outlet of the diverter is connected to the expansion valve, evaporator and compressor 4 in sequence through valve 2, and finally connected to the right end inlet of the mixer.

[0023] A method for generating electricity and cooling in a photovoltaic-storage-electricity-cooling integrated three-carbon cycle system, comprising the following steps:

[0024] Step 1: Use concentrating modules to gather solar energy;

[0025] Step 2: The thermochemical heat storage module directly receives the solar energy collected by the concentrating module, stores the energy, and releases the energy to the compression power generation module through the circulation of the working fluid carbon dioxide;

[0026] Step 3: The compression power generation module generates electricity by expanding the working fluid carbon dioxide carrying a large amount of heat energy flowing into the thermochemical heat storage module, and transmits the electricity and the compressed working fluid carbon dioxide to the compression refrigeration module;

[0027] Step 4: The compression refrigeration module receives the electricity generated by the compression power generation module and the compressed working fluid carbon dioxide to complete expansion evaporation refrigeration.

[0028] In the aforementioned method for power generation / cooling of an integrated solar-storage-electricity-cooling three-carbon cycle system, in step 2, during heat storage, sunlight is focused through a lens into the interior of an endothermic reactor; the long-term focus of sunlight generates high-temperature heat, causing a thermal decomposition reaction of magnesium carbonate; the generated carbon dioxide and magnesium oxide are returned to the carbon dioxide storage tank and the magnesium oxide storage tank, respectively, along the carbon dioxide pipeline and the magnesium oxide pipeline through the interface of the endothermic reactor;

[0029] When releasing heat, the carbon dioxide in the carbon dioxide storage tank and the magnesium oxide in the magnesium oxide storage tank follow the carbon dioxide pipeline and the magnesium oxide pipeline respectively, and enter the heat release reactor through the heat release reactor interface; after the internal temperature of the heat release reactor exceeds the set temperature, the carbon dioxide and magnesium oxide undergo a carbonation exothermic reaction, and the energy is released to the compression power generation module through the circulation of the working fluid carbon dioxide; the generated magnesium carbonate returns to the magnesium carbonate storage tank along the magnesium carbonate pipeline and releases energy.

[0030] The aforementioned method for power generation / refrigeration of an integrated solar-storage-electricity-cooling three-carbon cycle system includes, in step three:

[0031] 31) The working fluid carbon dioxide, which carries a large amount of heat energy inside the heat release reactor, flows directly out of the outlet pipe and enters the centrifugal filter of the compression power generation module to separate impurities and purify the working fluid. It then enters turbine 1 to perform the first-stage power generation task. At this time, the medium- and high-pressure carbon dioxide is converted into medium-pressure carbon dioxide.

[0032] 32) The medium-pressure CO2 passes through regenerator 1 and regenerator 2 in sequence, releasing a large amount of energy. It is then separated into two parts, CO2 1 and CO2 2, by tee pipe 1 and valve 1. CO2 1 directly enters compressor 1 to generate high-pressure CO2, which then enters tee pipe 2. CO2 2 enters the mixer and is directly mixed with the medium-pressure CO2 from the compression refrigeration module.

[0033] 33) The mixed medium-pressure CO2 passes through Cooler 1, Compressor 2, and Cooler 2 in sequence, completing a dual cooling and compression process, and is converted into medium- and high-pressure CO2. The medium- and high-pressure CO2 is then split into CO2 3 and CO2 4 based on the opening of Valve 2 under the action of the flow divider. CO2 3 flows into the compression power generation module, while CO2 4 flows into the compression refrigeration module.

[0034] The medium and high-pressure carbon dioxide 3 flowing into the compression power generation module enters compressor 3 to form high-pressure carbon dioxide, and then enters regenerator 2 for preheating; the preheated carbon dioxide 3 enters tee pipe 2, directly mixes with carbon dioxide 1, and then enters regenerator 1 to absorb more heat; after the mixed carbon dioxide obtains enough heat, it enters turbine 2 to perform the secondary power generation task, and finally returns to the heat release reactor along the direct inflow pipe.

[0035] The aforementioned power generation / refrigeration method of the integrated photovoltaic-storage-electricity-cooling three-carbon cycle system includes, in step 4:

[0036] The medium and high pressure carbon dioxide entering the compression refrigeration module flows into the expansion valve to form low pressure carbon dioxide;

[0037] Low-pressure carbon dioxide enters the evaporator and absorbs the heat of the cold water from the cold water inlet to achieve the cooling task;

[0038] The carbon dioxide at the evaporator outlet flows into compressor 4, is compressed to medium pressure, and then returns to the mixer.

[0039] In the aforementioned power generation / refrigeration method of the integrated photovoltaic-storage-electricity-cooling three-carbon cycle system, the data acquisition controller monitors the power consumption of the compression power generation module and the cooling of the compression refrigeration module;

[0040] When the user's power demand increases, the data acquisition controller controls the carbon dioxide storage tank and the magnesium oxide storage tank to increase the flow of carbon dioxide and magnesium oxide into the heat release reactor, causing more thermochemical reactions and releasing more heat; the excess heat-carrying carbon dioxide flows into the compression power generation module, increasing the energy conversion driving force of the compression power generation module; then, the data acquisition controller controls valve two to reduce the flow of carbon dioxide four flowing into the compression refrigeration module and increase the flow of carbon dioxide three flowing into the compression power generation module; based on the input heat, carbon dioxide flow and user power demand, the data acquisition controller controls turbine one to reduce the outlet pressure and controls compressors one, two and three to increase the outlet pressure, so that carbon dioxide three reaches the optimal working capacity and maximizes the power generation of the compression power generation module;

[0041] When the user's cooling demand increases, the data acquisition controller controls valve two to reduce the flow of carbon dioxide three flowing into the compression power generation module and increase the flow of carbon dioxide four flowing into the compression refrigeration module; then, the data acquisition controller controls compressor four to increase the outlet pressure based on the input power, carbon dioxide flow and user cooling demand, so that carbon dioxide four reaches the optimal working capacity and maximizes the cooling of the compression refrigeration module.

[0042] The beneficial effects achieved by the present invention are as follows: In the photovoltaic-storage-electricity-cooling integrated three-carbon cycle system of the present invention, carbon dioxide simultaneously serves as a carrier for heat storage / release, power generation and refrigeration, and circulates directly between systems to achieve heat transfer, thereby facilitating photovoltaic-storage-electricity-cooling integration.

[0043] Thermochemical heat storage replaces traditional medium heat storage, improves heat storage energy density and reduces energy loss; by doping and modifying the magnesium oxide / magnesium carbonate heat storage medium with plasmon nanoparticles, the light absorption and heat conversion are enhanced by the electron excitation-relaxation process, thereby improving the heat storage pressure and thermochemical conversion efficiency of magnesium oxide / magnesium carbonate.

[0044] A flexible multi-stage compression cooling supercritical Brayton cycle structure is designed, with the high-pressure working area matched with the power generation device, the medium- and high-pressure working area matched with the heat storage module, and the medium-pressure working area matched with the refrigeration module. It can flexibly adapt to heat input and power output and enhance the overall system operation energy efficiency.

[0045] The entire system is in a supercritical state, and modules can exchange heat directly without the need for an intermediate heat exchanger, which helps to enhance the compactness of the system structure, improve the quality of the input heat source and improve the overall economic benefits.

[0046] The integrated photovoltaic-storage-electricity-cooling three-carbon cycle system of the present invention monitors the thermometer, pressure gauge and flow meter through a data acquisition controller; adjusts the operating temperature, compression ratio, split ratio and working fluid flow of the power generation module according to the input heat and power generation demand; and adjusts the operating temperature, expansion ratio and working fluid flow of the refrigeration module according to the input power and cooling demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the integrated solar-storage-electricity-cooling three-carbon cycle in Example 1 of the present invention;

[0048] Figure 2 Schematic diagram of the structure of the focusing module in Example 1 of the present invention;

[0049] Figure 3 Schematic diagram of the structure of the thermochemical heat storage module in Example 1 of the present invention;

[0050] Figure 4 This is a schematic structural diagram of a compression power generation module and a compression refrigeration module in Example 1 of the present invention;

[0051] Figure 5 This is the temperature-entropy diagram of the integrated solar-storage-electricity-cooling three-carbon cycle in Example 1 of the present invention.

[0052] Figure 1: 1. Concentrating module, 2. Thermochemical heat storage module, 3. Compression power generation module, 4. Compression refrigeration module, 5. Data acquisition module, 101. Heliostat, 102. Heliostat bracket, 103. Concentrating lens bracket, 104. Fixing block, 105. Concentrating lens, 106. Reflector, 201. Endothermic reactor, 202. Lens, 203. Endothermic reactor interface, 204. Carbon dioxide, 205. Magnesium oxide, 206. Carbon dioxide pipeline, 207. Magnesium oxide pipeline, 208. Carbon dioxide storage tank, 209. Magnesium carbonate storage tank, 210. Magnesium oxide storage tank, 211. Magnesium carbonate pipeline, 212. Heat release reactor, 213. Heat release reactor interface, 214. Magnesium carbonate, 301. Direct flow Outlet pipe, 302. Centrifugal filter, 303. Turbine 1, 304. Regenerator 1, 305. Regenerator 2, 306. Valve 1, 307. Mixer, 308. Compressor 1, 309. Cooler 1, 310. Cooling water inlet 1, 311. Compressor 2, 312. Cooler 2, 313. Cooling water inlet 2, 314. Diverter, 315. Compressor 3, 316. Turbine 2, 317. Direct inflow pipe, 318. Tee pipe 1, 319. Carbon dioxide 1, 320. Carbon dioxide 2, 321. Carbon dioxide 3, 322. Carbon dioxide 4, 323. Tee pipe 2, 401. Valve 2, 402. Expansion valve, 403. Evaporator, 404. Cold water inlet, 405. Compressor 4. DETAILED DESCRIPTION

[0053] like Figure 1 As shown, an integrated solar-storage-electricity-cooling three-carbon cycle system includes a concentrating module 1, a thermochemical heat storage module 2, a compression power generation module 3, a compression refrigeration module 4, a data acquisition module 5, and a control system 6. All modules and connecting pipelines are covered with thermal insulation materials.

[0054] The concentrating module 1 is used to collect solar energy;

[0055] Thermochemical heat storage module 2 does not require an intermediate medium or heat exchanger, and directly receives the solar energy collected by the concentrating module 1. It stores the heat energy in the heat storage medium through thermochemical reactions and releases it into the working fluid carbon dioxide.

[0056] The compression power generation module 3 does not require an intermediate medium or a heat exchanger, and receives the working fluid carbon dioxide carrying a large amount of heat energy from the thermochemical heat storage module 2 for power generation and working fluid compression;

[0057] The compression refrigeration module 4 directly receives the electricity generated by the compression power generation module 3 and the compressed working fluid carbon dioxide for refrigeration;

[0058] Data acquisition module 5 is connected to the concentrating module 1, thermochemical heat storage module 2, compression power generation module 3, and compression refrigeration module 4, respectively, to collect power and refrigeration data and control the operating parameters of each module. The entire integrated solar-storage-electricity-refrigeration three-carbon cycle system is always in a supercritical state.

[0059] like Figure 2 As shown, the focusing module 1 includes a heliostat 101 , a focusing lens bracket 103 , a focusing lens 105 and a reflector 106 .

[0060] The heliostat 101 is firmly placed on the ground by the heliostat bracket 102 ; the focusing lens bracket 103 is installed at the center of the wall of the endothermic reactor 201 of the thermochemical heat storage module 2 , and a fixing block 104 is provided on the focusing lens bracket 103 ; the focusing lens 105 is fixed on the fixing block 104 .

[0061] The focusing lens bracket 103 includes an upper bracket and a lower bracket that are symmetrically arranged, and a reflector 106 is arranged on the inner wall of the bracket.

[0062] like Figure 3 As shown, the thermochemical heat storage module 2 includes a heat absorption reactor 201, a heat release reactor 212, and a series of storage tanks, pipelines and interfaces.

[0063] A lens 202 is installed at the center of the wall of the endothermic reactor 201 to receive sunlight; the endothermic reactor 201 is placed at the initial end of the thermochemical heat storage module 2, and the endothermic reactor 201 is connected to the carbon dioxide storage tank 208, the magnesium oxide storage tank 210 and the magnesium carbonate storage tank 209 through the carbon dioxide pipeline 206, the magnesium oxide pipeline 207 and the magnesium carbonate pipeline 211 respectively, and finally connected to the heat release reactor 212 at the end.

[0064] like Figure 4 As shown, the compression power generation module 3 includes a turbine, a regenerator, a compressor, a mixer 307, a cooler, a flow divider 314, and several valves, pipes, and elbows.

[0065] The working medium carbon dioxide carrying a large amount of heat energy inside the heat release reactor 212 in the thermochemical heat storage module 2 flows directly into the compression power generation module 3 along the outflow pipe 301 .

[0066] The outlet of the heat release reactor 212 is connected to the centrifugal filter 302, turbine 1 303, the upper inlet of regenerator 1 304, and the upper inlet of regenerator 2 305 in sequence through the direct outflow pipe 301. The upper outlet of regenerator 2 305 is connected to tee pipe 1 318 and valve 1 306 in sequence.

[0067] Tee pipe 1 318 and valve 1 306 separate the carbon dioxide into two parts: carbon dioxide 1 319 and carbon dioxide 2 320. Carbon dioxide 1 319 flows into compressor 1 308, and carbon dioxide 2 320 flows into the left inlet of mixer 307. The lower outlet of mixer 307 is connected to cooler 1 309, compressor 2 311, cooler 2 312, and splitter 314 in sequence. The outlet of compressor 1 308 is connected to the lower inlet of tee pipe 2 323. The left and right inlets of tee pipe 2 323 are connected to the lower inlet of regenerator 1 304 and the lower outlet of regenerator 2 305, respectively.

[0068] The outlet of the left end of the flow splitter 314 is connected to the compressor 3 315 , and the outlet of the compressor 3 315 is connected to the inlet of the lower end of the regenerator 2 305 ;

[0069] The lower outlet of the regenerator 1 304 is connected to the heat release reactor 212 through the turbine 2 316 and the direct inflow pipe 317 .

[0070] like Figure 4 As shown, the compression refrigeration module 4 includes a compressor, an evaporator, a mixer 307 , a cooler, a flow divider 314 , and several valves, elbows, and pipes.

[0071] The mixer 307 is connected to the cooler 1 309, the compressor 2 311, the cooler 2 312 and the diverter 314 in sequence; the mixer 307, the diverter 314, the cooler 1 309, the compressor 2 311 and the cooler 2 312 are the common ends of the compression power generation module 3 and the compression refrigeration module 4, and are connected in parallel with the compressor 1 308. The internal working fluid exists in both the compression power generation module 3 and the compression refrigeration module 4.

[0072] The second valve 401 is placed at the right outlet of the diverter 314 to restrict the flow of the working medium carbon dioxide from directly flowing into the compression power generation module 3 or the compression refrigeration module 4;

[0073] The right end outlet of the diverter 314 is connected to the expansion valve 402, the evaporator 403 and the compressor 4 405 in sequence through the valve 2 401, and finally connected to the right end inlet of the mixer 307.

[0074] This embodiment provides a power generation / cooling method for an integrated solar-storage-electricity-cooling three-carbon cycle system, comprising the following steps:

[0075] Step 1: Use the concentrating module 1 to gather solar energy;

[0076] Step 2: Thermochemical heat storage module 2 directly receives the solar energy collected by the concentrating module 1 without the need for an intermediate medium or heat exchanger, stores the energy, and releases the energy to the compression power generation module 3 through the circulation of the working medium carbon dioxide;

[0077] Step 3: The compression power generation module 3 does not require an intermediate medium or a heat exchanger. It generates electricity by expanding the working fluid carbon dioxide carrying a large amount of heat energy flowing into the thermochemical heat storage module 2, and transmits the electricity and the compressed working fluid carbon dioxide to the compression refrigeration module 4.

[0078] Step 4: The compression refrigeration module 4 directly receives the electricity generated by the compression power generation module 3 and the compressed working fluid carbon dioxide to complete expansion evaporation refrigeration.

[0079] like Figure 2 As shown, in step 1, the heliostat 101 refracts the solar beam to the focusing lens 105 ; through the focusing lens 105 , most of the solar beam is focused into the endothermic reactor 201 ; a small part of the solar beam enters the endothermic reactor 201 through the action of the reflector 106 .

[0080] like Figure 3 As shown, in step 2, during heat storage, sunlight is focused into the interior of the endothermic reactor 201 through the lens 202; the long-term focus of sunlight generates high-temperature heat, causing the magnesium carbonate 214 to undergo a thermal decomposition reaction; the generated carbon dioxide 204 and magnesium oxide 205 pass through the endothermic reactor interface 203 along the carbon dioxide pipeline 206 and the magnesium oxide pipeline 207 and return to the carbon dioxide storage tank 208 and the magnesium oxide storage tank 210 respectively;

[0081] During heat release, carbon dioxide 204 from carbon dioxide storage tank 208 and magnesium oxide 205 from magnesium oxide storage tank 210 flow along carbon dioxide pipeline 206 and magnesium oxide pipeline 207, respectively, through heat release reactor interface 213, and into heat release reactor 212. When the temperature inside heat release reactor 212 exceeds a set temperature, such as 650°C, carbon dioxide 204 and magnesium oxide 205 undergo an exothermic carbonation reaction, releasing energy to compression power generation module 3 through the circulating flow of the working medium carbon dioxide. The generated magnesium carbonate 214 flows along magnesium carbonate pipeline 211 back to magnesium carbonate storage tank 209. During operation, thermochemical heat storage module 2 is in a supercritical state.

[0082] This embodiment replaces traditional dielectric heat storage with thermochemical heat storage to increase the heat storage energy density and reduce energy loss. By doping and modifying magnesium oxide / magnesium carbonate with plasmonic nanoparticles, light absorption and heat conversion are enhanced by the electron excitation-relaxation process, thereby increasing the heat storage pressure and thermochemical conversion efficiency of magnesium oxide / magnesium carbonate.

[0083] like Figure 4 As shown, in step three, it includes:

[0084] S31) The working medium carbon dioxide carrying a large amount of heat energy in the heat release reactor 212 flows along the direct outflow pipe 301 into the centrifugal filter 302 of the compression power generation module 3 to separate impurities and purify the working medium. The carbon dioxide then enters the turbine 1 303 to perform the first-stage power generation task. At this point, the medium- and high-pressure carbon dioxide is converted into medium-pressure carbon dioxide.

[0085] S32) The medium-pressure carbon dioxide passes through regenerator 1 304 and regenerator 2 305 in sequence, releasing a large amount of energy. It is then separated into carbon dioxide 1 319 and carbon dioxide 2 320 by tee pipe 1 318 and valve 1 306. Carbon dioxide 1 319 directly enters compressor 1 308 to generate high-pressure carbon dioxide, which then enters tee pipe 2 323. Carbon dioxide 2 320 enters mixer 307 and is directly mixed with the medium-pressure carbon dioxide from compression refrigeration module 4.

[0086] S33) The mixed medium-pressure carbon dioxide passes through cooler 1 309, compressor 2 311, and cooler 2 312 in sequence, completing a dual cooling and compression process, and is converted into medium- and high-pressure carbon dioxide. Then, under the action of splitter 314, the medium- and high-pressure carbon dioxide is again divided into two parts, carbon dioxide 3 321 and carbon dioxide 4 322, according to the opening of valve 2 401. Carbon dioxide 3 321 flows into compression power generation module 3, and carbon dioxide 4 322 flows into compression refrigeration module 4.

[0087] The medium- and high-pressure carbon dioxide 3 321 flowing into the compression power generation module 3 enters the compressor 3 315 to form high-pressure carbon dioxide, and then enters the regenerator 2 305 for preheating; the preheated carbon dioxide 3 321 enters the tee pipe 2 323, directly mixes with the carbon dioxide 1 319, and then enters the regenerator 1 304 to absorb more heat; after the mixed carbon dioxide obtains sufficient heat, it enters the turbine 2 316 to perform the secondary power generation task, and finally returns to the heat release reactor 212 along the direct inflow pipe 317.

[0088] The flexible multi-stage compression cooling supercritical Brayton cycle structure of this embodiment matches the high-pressure working area with the power generation device, the medium- and high-pressure working area with the heat storage module, and the medium-pressure working area with the refrigeration module, flexibly adapting to heat input and power output to enhance the overall system operation energy efficiency.

[0089] like Figure 4 As shown, in step 4, it includes:

[0090] The medium- and high-pressure carbon dioxide 4 322 entering the compression refrigeration module 4 flows into the expansion valve 402 to form low-pressure carbon dioxide;

[0091] The low-pressure carbon dioxide enters the evaporator 403 and absorbs the heat of the cold water from the cold water inlet 404 to achieve the cooling task;

[0092] The carbon dioxide at the outlet of the evaporator 403 flows into the compressor 405, is compressed to a medium pressure, and then returns to the mixer 307.

[0093] Example 2

[0094] This embodiment provides a power generation / cooling method for an integrated solar-storage-electricity-cooling three-carbon cycle system, comprising the following steps:

[0095] Step 1: Use the concentrating module 1 to gather solar energy;

[0096] Step 2: Thermochemical heat storage module 2 directly receives the solar energy collected by the concentrating module 1 without the need for an intermediate medium or heat exchanger, stores the energy, and releases the energy to the compression power generation module 3 through the circulation of the working medium carbon dioxide;

[0097] Step 3: The compression power generation module 3 does not require an intermediate medium or a heat exchanger. It generates electricity by expanding the working fluid carbon dioxide carrying a large amount of heat energy flowing into the thermochemical heat storage module 2, and transmits the electricity and the compressed working fluid carbon dioxide to the compression refrigeration module 4.

[0098] Step 4: The compression refrigeration module 4 directly receives the electricity generated by the compression power generation module 3 and the compressed working fluid carbon dioxide to complete expansion evaporation refrigeration.

[0099] Also includes:

[0100] The data acquisition controller monitors the power consumption of the compression power generation module 3 and the cooling of the compression cooling module 4;

[0101] When the user's power demand increases, the data acquisition controller controls the carbon dioxide storage tank 208 and the magnesium oxide storage tank 210 to increase the flow of carbon dioxide 204 and magnesium oxide 205 into the heat release reactor 212, so that more thermochemical reactions occur and more heat is released;

[0102] The excess heat-carrying carbon dioxide 204 flows into the compression power generation module 3, increasing the energy conversion driving force of the compression power generation module 3;

[0103] Subsequently, the data acquisition controller controls valve 2 401 to reduce the flow of carbon dioxide 4 322 flowing into the compression refrigeration module 4 and increase the flow of carbon dioxide 3 321 flowing into the compression power generation module 3;

[0104] Finally, the data acquisition controller controls turbine 1 303 to reduce the outlet pressure, and controls compressor 1 308, compressor 2 311 and compressor 3 315 to increase the outlet pressure based on the input heat, carbon dioxide flow and user power supply requirements, so that carbon dioxide 3 321 reaches the optimal working capacity and the power generation of the compression power generation module 3 is maximized.

[0105] When the user's cooling demand increases, the data acquisition controller controls valve 2 401 to reduce the flow of carbon dioxide 3 321 flowing into the compression power generation module 3 and increase the flow of carbon dioxide 4 322 flowing into the compression refrigeration module 4;

[0106] Subsequently, the data acquisition controller controls the compressor four 405 to increase the outlet pressure according to the input power, carbon dioxide flow and user cooling demand, so that the carbon dioxide four 322 reaches the optimal working capacity and realizes the maximum cooling of the compression refrigeration module 4.

[0107] In this embodiment, the high pressure range is 16-24 MPa, the medium-high pressure range is 8.5-11.5 MPa, the medium pressure range is 7-7.5 MPa, and the low pressure range is 3.5-4.5 MPa.

[0108] The above is only a preferred example of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A solar-storage-electricity-cooling integrated three-carbon cycle system, characterized in that: include: A concentrating module (1) for concentrating solar energy; The thermochemical heat storage module (2) directly receives the solar energy collected by the concentrating module (1), stores the heat energy in a heat storage medium through a thermochemical reaction, and releases the heat energy into the working fluid carbon dioxide; The compression power generation module (3) directly receives the working fluid carbon dioxide carrying heat energy from the thermochemical heat storage module (2) for power generation and working fluid compression; In the compression power generation module (3), the outlet of the heat release reactor (212) is connected in sequence to the centrifugal filter (302), turbine 1 (303), the upper inlet of regenerator 1 (304), and the upper inlet of regenerator 2 (305) through a direct outflow pipe (301), and the upper outlet of regenerator 2 (305) is connected in sequence to tee pipe 1 (318) and valve 1 (306); The three-way pipe 1 (318) and the valve 1 (306) separate the carbon dioxide into two parts, carbon dioxide 1 (319) and carbon dioxide 2 (320). The carbon dioxide 1 (319) flows into the compressor 1 (308), and the carbon dioxide 2 (320) flows into the left inlet of the mixer (307); the lower outlet of the mixer (307) is connected to the cooler 1 (309), the compressor 2 (311), the cooler 2 (312) and the splitter (314) in sequence; the outlet of the compressor 1 (308) is connected to the lower inlet of the three-way pipe 2 (323), and the left outlet and the right inlet of the three-way pipe 2 (323) are connected to the lower inlet of the regenerator 1 (304) and the lower outlet of the regenerator 2 (305) respectively. The outlet of the left end of the flow divider (314) is connected to the compressor 3 (315), and the outlet of the compressor 3 (315) is connected to the inlet of the lower end of the regenerator 2 (305); The lower end outlet of the regenerator 1 (304) is connected to the heat release reactor (212) through the turbine 2 (316) and the direct inflow pipe (317); The compression refrigeration module (4) directly receives the electricity generated by the compression power generation module (3) and the compressed working fluid carbon dioxide for refrigeration; In the compression refrigeration module (4), the mixer (307) is connected in sequence to the cooler 1 (309), the compressor 2 (311), the cooler 2 (312) and the splitter (314); The second valve (401) is placed at the right end outlet of the diverter (314) to restrict the flow of the working medium carbon dioxide from directly flowing into the compression power generation module (3) or the compression refrigeration module (4); The right end outlet of the diverter (314) is connected to the expansion valve (402), the evaporator (403) and the compressor (405) in sequence through the valve 2 (401), and finally connected to the right end inlet of the mixer (307).

2. The photovoltaic-storage-electricity-cooling integrated three-carbon cycle system according to claim 1, characterized in that: Also includes: The data acquisition module (5) is respectively connected to the light collecting module (1), the thermochemical heat storage module (2), the compression power generation module (3), and the compression refrigeration module (4), and is used to collect power and refrigeration data and control the operating parameters of each module.

3. The photovoltaic-storage-electricity-cooling integrated three-carbon cycle system according to claim 1, characterized in that: The focusing module (1) comprises a heliostat (101), a focusing lens bracket (103), a focusing lens (105) and a reflector (106); The heliostat (101) is firmly placed on the ground via a heliostat bracket (102); the focusing lens bracket (103) is mounted on the wall surface of the endothermic reactor (201) of the thermochemical heat storage module (2); a fixing block (104) is provided on the focusing lens bracket (103); and the focusing lens (105) is fixed on the fixing block (104); The condenser lens bracket (103) comprises an upper bracket and a lower bracket which are symmetrically arranged, and a reflector (106) is arranged on the inner wall surface of the bracket.

4. The photovoltaic-storage-electricity-cooling integrated three-carbon cycle system according to claim 1, characterized in that: The thermochemical heat storage module (2) includes an endothermic reactor (201); A lens (202) is installed on the wall of the endothermic reactor (201) to receive sunlight; the endothermic reactor (201) is connected to a carbon dioxide storage tank (208), a magnesium oxide storage tank (210), and a magnesium carbonate storage tank (209) through a carbon dioxide pipeline (206), a magnesium oxide pipeline (207), and a magnesium carbonate pipeline (211), respectively, and finally connected to a heat release reactor (212) at the end.

5. The power generation / refrigeration method of the photovoltaic-storage-electricity-cooling integrated three-carbon cycle system according to claim 1, characterized in that: The following steps are involved: Step 1: Concentrating solar energy using a concentrating module (1); Step 2: The thermochemical heat storage module (2) directly receives the solar energy collected by the concentrating module (1), stores the energy, and releases the energy to the compression power generation module (3) through the circulation of the working medium carbon dioxide; Step 3: The compression power generation module (3) generates electricity by expanding the working medium carbon dioxide carrying a large amount of heat energy flowing into the thermochemical heat storage module (2), and transmits the electricity and the compressed working medium carbon dioxide to the compression refrigeration module (4); Step 4: The compression refrigeration module (4) receives the electricity generated by the compression power generation module (3) and the compressed working medium carbon dioxide, and completes expansion evaporation refrigeration.

6. The power generation / refrigeration method of the photovoltaic-storage-electricity-cooling integrated three-carbon cycle system according to claim 5, characterized in that: In step 2, when storing heat, sunlight is focused into the interior of the endothermic reactor (201) through the lens (202); the long-term focusing of sunlight generates high-temperature heat, causing the magnesium carbonate (214) to undergo a thermal decomposition reaction; the generated carbon dioxide (204) and magnesium oxide (205) pass through the endothermic reactor interface (203) and return to the carbon dioxide storage tank (208) and the magnesium oxide storage tank (210) along the carbon dioxide pipeline (206) and the magnesium oxide pipeline (207), respectively; During heat release, the carbon dioxide (204) in the carbon dioxide storage tank (208) and the magnesium oxide (205) in the magnesium oxide storage tank (210) flow along the carbon dioxide pipeline (206) and the magnesium oxide pipeline (207), respectively, and enter the heat release reactor (212) through the heat release reactor interface (213); after the internal temperature of the heat release reactor (212) exceeds the set temperature, the carbon dioxide (204) and the magnesium oxide (205) undergo a carbonation exothermic reaction, and the energy is released to the compression power generation module (3) through the circulating flow of the working medium carbon dioxide; the generated magnesium carbonate (214) returns to the magnesium carbonate storage tank (209) along the magnesium carbonate pipeline (211).

7. The power generation / refrigeration method of the photovoltaic-storage-electricity-cooling integrated three-carbon cycle system according to claim 5, characterized in that: In step three, include: S31) The working medium carbon dioxide carrying a large amount of heat energy in the heat release reactor (212) flows along the direct outflow pipe (301) into the centrifugal filter (302) of the compression power generation module (3) to achieve impurity separation and working medium purification, and then enters the turbine 1 (303) to perform the first-stage power generation task. At this time, the medium- and high-pressure carbon dioxide is converted into medium-pressure carbon dioxide; S32) The medium-pressure carbon dioxide passes through the regenerator 1 (304) and the regenerator 2 (305) in sequence, releasing a large amount of energy, and is then divided into two parts, carbon dioxide 1 (319) and carbon dioxide 2 (320), by the tee pipe 1 (318) and the valve 1 (306); carbon dioxide 1 (319) directly enters the compressor 1 (308) to generate high-pressure carbon dioxide, and then enters the tee pipe 2 (323); carbon dioxide 2 (320) enters the mixer (307) and is directly mixed with the medium-pressure carbon dioxide from the compression refrigeration module (4); S33) The mixed medium-pressure carbon dioxide passes through cooler 1 (309), compressor 2 (311) and cooler 2 (312) in sequence, completing the double cooling and compression process, and is converted into medium- and high-pressure carbon dioxide; then, under the action of the splitter (314), the medium- and high-pressure carbon dioxide is again divided into carbon dioxide 3 (321) and carbon dioxide 4 (322) according to the opening of valve 2 (401); carbon dioxide 3 (321) flows into the compression power generation module (3), and carbon dioxide 4 (322) flows into the compression refrigeration module (4); The medium and high pressure carbon dioxide three (321) flowing into the compression power generation module (3) enters the compressor three (315) to form high pressure carbon dioxide, and then enters the regenerator two (305) for preheating; the preheated carbon dioxide three (321) enters the three-way pipe two (323), is directly mixed with the carbon dioxide one (319), and then enters the regenerator one (304) to absorb more heat; after the mixed carbon dioxide obtains enough heat, it enters the turbine two (316) to perform the secondary power generation task, and finally returns to the heat release reactor (212) along the direct inflow pipe (317).

8. The power generation / refrigeration method of the photovoltaic-storage-electricity-cooling integrated three-carbon cycle system according to claim 7, characterized in that: In step four, include: The medium- and high-pressure carbon dioxide (322) entering the compression refrigeration module (4) flows into the expansion valve (402) to form low-pressure carbon dioxide; The low-pressure carbon dioxide enters the evaporator (403) and absorbs the heat of the cold water from the cold water inlet (404), thereby achieving the cooling task; The carbon dioxide at the outlet of the evaporator (403) flows into the compressor four (405), is compressed to reach the medium pressure, and then returns to the mixer (307).

9. The power generation / refrigeration method of the photovoltaic-storage-electricity-cooling integrated three-carbon cycle system according to claim 8, characterized in that: The data acquisition controller monitors the power consumption of the compression power generation module (3) and the cooling performance of the compression cooling module (4); When the user's power demand increases, the data acquisition controller controls the carbon dioxide storage tank (208) and the magnesium oxide storage tank (210) to increase the flow of carbon dioxide (204) and magnesium oxide (205) into the heat release reactor (212), so that more thermochemical reactions occur and more heat is released; the excess heat-carrying carbon dioxide (204) flows into the compression power generation module (3), increasing the energy conversion driving force of the compression power generation module (3); then, the data acquisition controller controls valve two (401) to reduce the flow of carbon dioxide four (322) flowing into the compression refrigeration module (4) and increase the flow of carbon dioxide three (321) flowing into the compression power generation module (3); based on the input heat, carbon dioxide flow and user power demand, the data acquisition controller controls turbine one (303) to reduce the outlet pressure, controls compressor one (308), compressor two (311) and compressor three (315) to increase the outlet pressure, so that carbon dioxide three (321) reaches the optimal working capacity, thereby maximizing the power generation of the compression power generation module (3); When the user's cooling demand increases, the data acquisition controller controls valve 2 (401) to reduce the flow of carbon dioxide 3 (321) flowing into the compression power generation module (3) and increase the flow of carbon dioxide 4 (322) flowing into the compression refrigeration module (4); then, the data acquisition controller controls compressor 4 (405) to increase the outlet pressure based on the input power, carbon dioxide flow and user's cooling demand, so that carbon dioxide 4 (322) reaches the optimal working capacity and realizes the maximum cooling of the compression refrigeration module (4).

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