A combined cooling and heating and power system

Abstract

The application relates to the technical field of solar power generation, in particular to a combined cooling, heating and power (CCHP) system. A first heat storage circuit is used for collecting solar energy and storing the solar energy as low-temperature heat energy; a second heat storage circuit is coupled with the first heat storage circuit and is used for converting the low-temperature heat energy into high-temperature heat energy and storing the high-temperature heat energy; a user heat circuit is coupled with the first heat storage circuit and / or the second heat storage circuit and is used for transmitting a heat source to a user heat end; a user cold circuit is coupled with the first heat storage circuit and / or the second heat storage circuit and is used for generating a cold source and transmitting the cold source to a user cold end; and a power generation circuit is coupled with the second heat storage circuit and is used for converting the high-temperature heat energy into electric energy. Through the synergistic integration of multi-stage energy storage, hierarchical heat coupling and multi-end energy output, the application realizes efficient and full-grade cascade utilization of solar energy, significantly reduces heat loss, meets the multiple demands of users for power generation, heat supply and refrigeration, greatly improves the overall energy utilization efficiency of the system and avoids resource waste.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar power generation, in particular to a combined cooling, heating and power system. BACKGROUND

[0002] Currently, the direct utilization of solar energy is usually single-function. For example, the common solar heat collection system is mainly used for producing hot water or heating, while the photovoltaic system is specially used for power generation. These systems often run independently and are difficult to meet the diversified and immediate needs of users for cold, heat and electricity. In addition, solar energy itself is intermittent and volatile. In order to overcome this defect, heat storage technology is introduced into the system for the storage of energy in surplus period and the release in shortage period, so as to smooth the energy output.

[0003] However, the existing solar system with heat storage still focuses on realizing single function or simple superposition of several functions. A typical mode is to use a single high-temperature heat storage device to uniformly store the collected solar thermal energy, and according to a preset simple logic, the heat energy is used to drive a power generator set, or for heating, or for cooling in summer through an absorption chiller. This architecture has obvious deficiencies: when the user's cold, heat and electricity demand changes dynamically over time, the system cannot efficiently and flexibly allocate limited heat energy resources, which may cause energy waste or failure to optimally meet all demands, resulting in the need to improve the overall utilization efficiency and economy of solar energy. SUMMARY

[0004] The present application provides a combined cooling, heating and power system to solve the problem of lack of cold, heat and power collaborative supply system, which leads to failure to meet diversified demands and resource waste.

[0005] To solve the above problems, a combined cooling, heating and power system comprises:

[0006] A first heat storage circuit for collecting solar energy and storing it as low-temperature heat energy;

[0007] A second heat storage circuit thermally coupled with the first heat storage circuit for converting the low-temperature heat energy into high-temperature heat energy and storing it;

[0008] A user heat circuit thermally coupled with the first heat storage circuit and / or the second heat storage circuit for transferring heat source to a user heat end;

[0009] A user cold circuit thermally coupled with the first heat storage circuit and / or the second heat storage circuit for generating a cold source and transferring the cold source to a user cold end;

[0010] A power generation circuit thermally coupled with the second heat storage circuit for converting the high-temperature heat energy into electrical energy.

[0011] Preferably, the primary heat storage circuit comprises a primary solar collector, a low-temperature heat storage tank and a first circulating pump arranged on the primary heat storage circuit for driving a first medium to sequentially pass through the primary solar collector and the low-temperature heat storage tank and form a closed loop.

[0012] Preferably, the secondary heat storage circuit further comprises a secondary solar collector, a high-temperature heat storage tank and a second circulating pump arranged on the secondary heat storage circuit for driving a second medium to sequentially pass through the low-temperature heat storage tank, the secondary solar collector and the high-temperature heat storage tank and form a closed loop.

[0013] Preferably, the power generation circuit comprises:

[0014] a displacement circuit comprising a first heat exchanger and a third circulating pump arranged on the displacement circuit for driving a third medium to sequentially pass through the high-temperature heat storage tank and the first heat exchanger and form a closed loop;

[0015] a vaporization circuit comprising a turbine and a fourth circulating pump arranged on the vaporization circuit for driving a fourth medium to sequentially pass through the first heat exchanger and the turbine and form a closed loop.

[0016] Preferably, the vaporization circuit further comprises a second heat exchanger, and the fourth medium sequentially passes through the turbine, the second heat exchanger and the first heat exchanger.

[0017] The power generation circuit further comprises a cooling circuit comprising a fifth circulating pump and a cooler, the fifth circulating pump being arranged on the cooling circuit for driving a fifth medium to sequentially pass through the second heat exchanger and the cooler and form a closed loop.

[0018] Preferably, the secondary heat storage circuit further comprises a third heat exchanger, and the second medium sequentially passes through the high-temperature heat storage tank, the third heat exchanger and the low-temperature heat storage tank.

[0019] Preferably, the heat utilization circuit comprises a low-temperature heat utilization circuit.

[0020] The low-temperature heat utilization circuit comprises a sixth circulating pump arranged on the low-temperature heat utilization circuit for driving a sixth medium to sequentially pass through the low-temperature heat storage tank and a user heat utilization end and form a closed loop.

[0021] Preferably, the heat utilization circuit further comprises a high-temperature heat utilization circuit, and the high-temperature heat utilization circuit comprises a seventh circulating pump arranged on the high-temperature heat utilization circuit for driving a seventh medium to sequentially pass through the third heat exchanger and the user heat utilization end and form a closed loop.

[0022] Preferably, the user cold circuit generates a cold source and transmits the cold source to the user cold end, which comprises a cold source generation circuit and a cold source transmission circuit;

[0023] The cold source generation circuit is an absorption refrigeration, which comprises an eighth circulating pump arranged on the cold source generation circuit for driving an eighth medium to sequentially pass through a generator, a condenser, a throttle valve, an evaporator and an absorber forming a closed loop;

[0024] The cold source transmission circuit comprises a ninth circulating pump arranged on the cold source transmission circuit for driving a ninth medium to sequentially pass through the evaporator, the user cold end and form a closed loop;

[0025] The generator is thermally coupled with the low-temperature heat storage tank and the high-temperature heat storage tank.

[0026] Preferably, the phase change temperature of the phase change heat storage material in the low-temperature heat storage tank is 80-90℃, and the phase change temperature of the phase change heat storage material in the high-temperature heat storage tank is 130-140℃;

[0027] The phase change heat storage material in the low-temperature heat storage tank is a eutectic material of oxalic acid dihydrate and boric acid, wherein the mass ratio of oxalic acid dihydrate to boric acid is 88:12; the phase change heat storage material in the high-temperature heat storage tank is a eutectic material of adipic acid and succinic acid, wherein the mass ratio of adipic acid to succinic acid is 2.9:1.

[0028] The cold heat and power cogeneration system has the advantages that the cold heat and power cogeneration system constructs a first heat storage loop, a second heat storage loop and a power generation loop, and realizes the solar energy grade promotion and cascade utilization through step-by-step heat coupling. The first heat storage loop can quickly collect and store solar energy to form a low-temperature heat source; the second heat storage loop, on the basis of heat coupling with the first heat storage loop, not only fully utilizes the low-temperature heat source, but also further promotes the low-temperature heat source to a high-temperature heat source that can be used for power generation; the power generation loop is heat coupled with the second heat storage loop, and realizes the efficient conversion of high-temperature heat energy to electric energy by driving the working medium vaporization and pushing the turbine. In addition, the system is provided with a user-side multi-purpose loop, a user heat circuit is heat coupled with the first heat storage loop and / or the second heat storage loop, and is used for transmitting the heat source to a user heat end; a user cold circuit is heat coupled with the first heat storage loop and / or the second heat storage loop, and is used for generating a cold source and transmitting the cold source to a user cold end. In the user heat circuit, the low-temperature heat circuit can provide 80-90 ℃ hot water or low-temperature process heat, and the high-temperature heat circuit can provide 130-140 ℃ steam or high-temperature process heat; the user cold circuit can output cold energy to the user through absorption refrigeration. Through the synergistic integration of multi-stage energy storage, cascade heat coupling and multi-end energy output, when the cold, heat and power demands of the user side dynamically change over time, the system can store heat through the first heat storage loop and the second heat storage loop, and efficiently and flexibly allocate the limited heat energy resources through the user heat circuit, the user cold circuit and the power generation circuit. Therefore, the cold heat and power cogeneration system can efficiently and fully utilize the solar energy in all grades and cascade, and meet the multiple demands of the user for power generation, heat supply and refrigeration. In addition, the system can significantly reduce the loss and greatly improve the overall energy utilization efficiency, and avoid resource waste. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 FIG. 1 is a schematic diagram of the cold heat and power cogeneration system.

[0030] REFERENCE SIGNS:

[0031] 1, first solar collector; 2, low-temperature heat storage tank; 3, first circulating pump; 4, second solar collector; 5, high-temperature heat storage tank; 6, second circulating pump; 7, third heat exchanger; 8, first heat exchanger; 9, third circulating pump; 10, turbine; 11, fourth circulating pump; 12, second heat exchanger; 13, fifth circulating pump; 14, cooler; 15, user heat end; 16, sixth circulating pump; 17, eighth circulating pump; 18, generator; 19, condenser; 20, throttling valve; 21, evaporator; 22, absorber; 23, ninth circulating pump; 24, first valve; 25, second valve; 26, seventh circulating pump; 27, user cold end. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0033] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0034] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0035] This embodiment provides a combined cooling, heating and power system, such as Figure 1 As shown, it includes: a primary thermal storage circuit, a secondary thermal storage circuit, and a power generation circuit. The primary thermal storage circuit is used to collect solar energy and store it as low-temperature thermal energy. The secondary thermal storage circuit is thermally coupled to the primary thermal storage circuit and is used to convert the low-temperature thermal energy into high-temperature thermal energy and store it.

[0036] The primary and secondary thermal storage loops work together to achieve cascaded energy storage and release. When a low-temperature heat source is needed, only the low-temperature heat source in the primary thermal storage loop needs to be transferred to the user side, without the need to replace it with a high-temperature heat source, thereby reducing energy loss.

[0037] The combined supply system of the embodiment further comprises a power generation loop, which is coupled with the secondary heat storage loop and is used to convert the high-temperature heat energy into electric energy. Through the primary heat storage loop, the low-temperature heat source can be quickly and effectively stored; through the secondary heat storage loop, the low-temperature heat source in the primary heat storage loop is utilized, and the temperature is further increased to a high-temperature heat source capable of generating electricity; through the power generation loop, the high-temperature heat source is utilized and electricity is generated. Therefore, the energy grade conversion and cascade utilization of the energy storage and power generation system of the embodiment are realized through the step-by-step thermal coupling mode, the multi-heat utilization requirements such as low-temperature heat utilization, high-temperature heat utilization and power generation are met, the loss is low, and the overall utilization efficiency of solar energy is improved.

[0038] It should be noted that the secondary heat storage loop extracts the low-temperature heat energy from the primary heat storage loop through the thermal coupling mode, and outputs the high-temperature heat energy to the power generation loop after the heat grade is increased by the secondary solar heat collector 4. Since the heat grade increasing process of the secondary heat storage loop is physically independent of the primary heat storage loop, the primary heat storage loop and the secondary heat storage loop use different heat storage mediums, and the two can run in parallel in different temperature ranges without interfering with each other.

[0039] The primary heat storage loop comprises a primary solar heat collector 1, a low-temperature heat storage tank 2 and a first circulating pump 3. The first circulating pump 3 is arranged on the primary heat storage loop, provides flow power for the first medium, and ensures that the first medium can transfer heat in the loop. The first medium passes through the primary solar heat collector 1 and the low-temperature heat storage tank 2 in turn and forms a closed loop. The primary solar heat collector 1 converts solar radiation into heat energy and transfers it to the first medium. After the first medium absorbs heat and increases temperature at the primary solar heat collector 1, it carries the heat energy into the low-temperature heat storage tank 2 to release heat and decrease temperature, and then returns to the heat collector to absorb heat again, thereby forming a stable thermodynamic circulation path.

[0040] The secondary heat storage loop comprises a secondary solar heat collector 4. The secondary solar heat collector 4 is used to increase the grade of the low-temperature heat energy to the high-temperature heat energy, that is, through the direct heat collection function of the secondary solar heat collector 4, the secondary capture of solar energy is realized.

[0041] Further, the secondary heat storage loop further comprises a high-temperature heat storage tank 5 and a second circulating pump 6. The second circulating pump 6 is arranged on the secondary heat storage loop and provides flow power for the second medium in the secondary heat storage loop. The second medium passes through the low-temperature heat storage tank 2, the secondary solar heat collector 4 and the high-temperature heat storage tank 5 in turn and forms a closed loop. The secondary solar heat collector 4 further heats and increases the temperature of the second medium after it flows out of the low-temperature heat storage tank 2, so that the second medium is increased from a low-temperature state to a high-temperature state meeting the power generation cycle parameter requirements, and then enters the high-temperature heat storage tank 5 for storage.

[0042] Further, the secondary thermal storage circuit further comprises a third heat exchanger 7, and the second medium sequentially passes through the high-temperature thermal storage tank 5, the third heat exchanger 7 and the low-temperature thermal storage tank 2 and forms a closed loop. By using the third heat exchanger 7, the user heat circuit can be coupled with the secondary thermal storage circuit, and the user heat circuit is used to transfer heat from the heat source to the user heat end 15.

[0043] Optionally, the user heat circuit in the embodiment has two forms of low-temperature heat circuit and high-temperature heat circuit, which are as follows:

[0044] The low-temperature heat circuit comprises a sixth circulating pump 16 arranged on the low-temperature heat circuit to provide circulating power. The sixth medium sequentially passes through the low-temperature thermal storage tank 2 and the user heat end 15 and forms a closed loop, that is, when the user side needs low-temperature heat, the heat can be directly obtained from the low-temperature thermal storage tank 2, and the user heat circuit is coupled with the primary thermal storage circuit.

[0045] The high-temperature heat circuit comprises a seventh circulating pump 26 arranged on the high-temperature heat circuit to provide circulating power. The seventh medium sequentially passes through the third heat exchanger 7 and the low-temperature heat end and forms a closed loop. After the seventh medium flows out of the high-temperature thermal storage tank 5, part of the heat is stored in the high-temperature thermal storage tank 5 to reduce the temperature, but the temperature is still higher than that in the low-temperature thermal storage tank 2. Therefore, by using the third heat exchanger 7, the user heat circuit is coupled with the secondary thermal storage circuit, which not only meets the high-temperature heat demand, but also further reduces the temperature of the seventh medium flowing out of the high-temperature thermal storage tank 5.

[0046] Optionally, the power generation circuit comprises two independent circulating units of displacement circuit and vaporization circuit. Specifically, the displacement circuit comprises a first heat exchanger 8 and a third circulating pump 9 arranged on the displacement circuit to provide power, and the third medium sequentially passes through the high-temperature thermal storage tank 5 and the first heat exchanger 8 and forms a closed loop. The vaporization circuit comprises a turbine 10 and a fourth circulating pump 11 arranged on the vaporization circuit to provide power, and the fourth medium sequentially passes through the first heat exchanger 8 and the turbine 10 and forms a closed loop. It should be noted that the mediums in the displacement circuit and the vaporization circuit are different. The third medium in the displacement circuit is used to transfer heat, which flows in liquid form, while the fourth medium in the vaporization circuit is vaporized by heat exchange in the first heat exchanger 8 to obtain latent heat of vaporization, thereby driving the turbine 10 to generate power.

[0047] The flow, flow rate and temperature of the third medium in the displacement circuit are independently regulated by the third circulating pump 9, which is not affected by the fluctuation of the power generation load, thereby avoiding the disturbance of the temperature field of the thermal storage medium in the high-temperature thermal storage tank 5 caused by the fluctuation of the power generation load, and maintaining the stability of the energy supply of the secondary thermal storage circuit.

[0048] Specifically, the vaporization circuit further comprises a second heat exchanger 12, and the second heat exchanger 12 is used to realize the thermal coupling with the cooling circuit. Specifically, the cooling circuit comprises a fifth circulating pump 13 and a cooler 14, the fifth circulating pump 13 is arranged on the cooling circuit to provide power, and a fifth medium sequentially passes through the second heat exchanger 12 and the cooler 14 to form a closed loop, and the fifth medium obtains the cold source from the cooler 14 and ensures the stable phase change of the medium in the vaporization circuit through the second heat exchanger 12.

[0049] Further, the combined cooling, heating and power system of the embodiment comprises a user cooling circuit, the user cooling circuit generates a cold source and delivers the cold source to a user cooling end 27, and the user cooling circuit comprises a cold source generation circuit and a cold source delivery circuit, and heat energy is converted into cold quantity by a lithium bromide absorption refrigeration cycle.

[0050] The cold source generation circuit comprises an eighth circulating pump 17, the eighth circulating pump 17 is arranged on the cold source generation circuit to provide circulating power, and is used to drive an eighth medium to sequentially pass through a generator 18, a condenser 19, a throttling valve 20, an evaporator 21 and an absorber 22 to form a closed loop. In operation, in the generator 18, heat energy from the low-temperature heat storage tank 2 or the high-temperature heat storage tank 5 heats the dilute lithium bromide aqueous solution through a thermal coupling interface, water with a lower boiling point in the solution absorbs heat to vaporize and evaporate, thereby separating a high-concentration lithium bromide concentrated solution. The concentrated solution flows into the absorber 22 under the action of gravity or pressure difference, and water vapor enters the refrigerant cycle side. In the absorber 22, the concentrated solution is diluted into a dilute solution after absorbing water vapor from the evaporator 21, and then is pressurized and transported back to the generator 18 under the driving of the eighth circulating pump 17, thereby completing the closed circulation of the solution circuit.

[0051] On the refrigerant cycle side, high-temperature water vapor generated in the generator 18 enters the condenser 19 and is condensed into high-pressure liquid water under the action of external cooling medium. After the liquid water is adiabatically throttled through the throttling valve 20, the pressure and temperature are synchronously reduced to form low-temperature and low-pressure liquid refrigerant. The liquid refrigerant enters the evaporator 21 and vaporizes and evaporates by absorbing the heat of the cold source delivery circuit, and the latent heat of phase change of the liquid refrigerant constitutes refrigeration capacity. The generated water vapor finally enters the absorber 22 and is absorbed by the concentrated lithium bromide solution, thereby completing the closed circulation of the refrigerant circuit.

[0052] The cold source delivery circuit comprises a ninth circulating pump 23, the ninth circulating pump 23 is arranged on the cold source delivery circuit to provide circulating power for a ninth medium, the ninth medium acts as a cold carrier medium, sequentially passes through the evaporator 21 and the user cooling end 27 to form a closed loop, and delivers the cold source generated by the evaporator 21 to the user cooling end 27.

[0053] Specifically, a first valve 24 and a second valve 25 are further provided, the first valve 24 is arranged on the coupling loop between the generator 18 and the low-temperature heat storage tank 2, and a circulating pump is arranged on the loop, so as to realize the heat coupling of the user cooling loop and the primary heat storage loop; the second valve 25 is arranged on the coupling loop between the generator 18 and the high-temperature heat storage tank 5, and a circulating pump is arranged on the loop, so as to realize the heat coupling of the user cooling loop and the secondary heat storage loop. When the required refrigeration load of the user side is low, only the first valve 24 is opened to utilize the heat in the low-temperature heat storage tank 2; when the refrigeration load is high, the second valve 25 is also opened to utilize the heat of the high-temperature heat storage tank 5 to enhance the evaporation effect of the lithium bromide solution and improve the refrigeration capacity.

[0054] Specifically, the secondary solar heat collector 4 has better heat collection efficiency than the primary solar heat collector 1. The specific preparation of the low-temperature heat storage tank 2, the high-temperature heat storage tank 5 and the secondary solar heat collector 4 involved in the embodiment is described in detail as follows:

[0055] The phase change temperature of the phase change heat storage material in the low-temperature heat storage tank is 80-90℃, and the phase change temperature of the phase change heat storage material in the high-temperature heat storage tank is 130-140℃. The phase change heat storage material in the low-temperature heat storage tank is a eutectic material of oxalic acid dihydrate and boric acid. The preparation method of the low-temperature heat storage tank is as follows: oxalic acid dihydrate (purity > 99%) and boric acid (purity > 99%) are mixed in a mass ratio of 88:12 and pre-dried. After grinding the mixture for 20 minutes, melt at 90℃ and stir for 10 minutes. Then naturally cool to room temperature and grind into powder to obtain the eutectic material.

[0056] The phase change heat storage material in the high-temperature heat storage tank is a eutectic material of adipic acid and succinic acid. The preparation method of the high-temperature heat storage tank is as follows: adipic acid and succinic acid are mixed in a mass ratio of 2.9:1 and placed in a flask, and then fully stirred with a magnetic stirring rod. The temperature is raised to 185℃ and stirred in an oil bath for 10 minutes. After cooling to room temperature, grind into powder to obtain the high-temperature eutectic material.

[0057] The light-heat converter uses a composite carbon material of carbon fibers and carbon nanotubes as the core heat absorption layer, and the preparation method is as follows:

[0058] First, polyaniline is electrochemically polymerized on the surface of plasma pretreated carbon fiber to form a uniform coating to provide catalyst binding sites; then the carbon fiber and polyaniline film are immersed in a mixed solution of iron acetylacetone and cobalt acetylacetone to achieve uniform loading of the catalytically active component; then, under an inert nitrogen atmosphere, the temperature is gradually increased to 800 DEG C, and carbon nanotubes (CNTs) are grown in situ by using the carbon source produced by melamine cracking under the catalytic action of the metal to construct a core-shell structure with carbon fiber as the core and carbon nanotubes as the shell; finally, residual catalyst is removed by hydrochloric acid washing and vacuum drying to form a composite film with high porosity and wide light absorption.

[0059] The composite coating has a wide spectrum of light absorption capacity of 300-2500 nm, and the surface temperature can reach 325 DEG C under 10 times the standard solar radiation intensity, and has excellent chemical stability. When applied to the system, it can efficiently absorb solar energy and heat the heat transfer oil in the primary heat storage loop to above 150 DEG C to provide a stable heat source for the secondary heat storage loop.

[0060] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A combined cooling, heating and power system, characterized in that, include: A primary heat storage circuit is used to collect solar energy and store it as low-temperature thermal energy. The primary heat storage circuit includes: a primary solar collector (1), a low-temperature heat storage tank (2), and a first circulation pump (3). The first circulation pump (3) is located on the primary heat storage circuit and is used to drive a first medium to pass through the primary solar collector (1) and the low-temperature heat storage tank (2) in sequence to form a closed loop. A secondary thermal storage circuit, thermally coupled to the primary thermal storage circuit, is used to convert the low-temperature thermal energy into high-temperature thermal energy and store it; the secondary thermal storage circuit also includes: a secondary solar collector (4), a high-temperature thermal storage tank (5), and a second circulation pump (6). The secondary solar collector (4) is used to collect and convert solar energy to raise the low-temperature thermal energy into the high-temperature thermal energy. The second circulation pump (6) is located on the secondary thermal storage circuit and is used to drive the second medium to pass through the low-temperature thermal storage tank (2), the secondary solar collector (4), and the high-temperature thermal storage tank (5) in sequence to form a closed loop. The user heat circuit is thermally coupled to the primary heat storage circuit and / or the secondary heat storage circuit, and is used to transfer the heat source to the user heat end (15). The user cooling circuit is thermally coupled to the primary heat storage circuit and / or the secondary heat storage circuit to generate a cold source and transfer the cold source to the user cooling end (27). The power generation circuit is thermally coupled to the secondary thermal storage circuit and is used to convert the high-temperature thermal energy into electrical energy; The phase change temperature of the phase change heat storage material in the low-temperature heat storage tank (2) is 80~90℃, and the phase change temperature of the phase change heat storage material in the high-temperature heat storage tank (5) is 130~140℃. The phase change heat storage material in the low-temperature heat storage tank (2) is a eutectic material of oxalic acid dihydrate and boric acid, wherein the mass ratio of oxalic acid dihydrate to boric acid is 88:12; the phase change heat storage material in the high-temperature heat storage tank (5) is a eutectic material of adipic acid and succinic acid, wherein the mass ratio of adipic acid to succinic acid is 2.9:

1.

2. The combined cooling, heating and power system according to claim 1, characterized in that, The power generation circuit includes: The displacement circuit includes a first heat exchanger (8) and a third circulation pump (9). The third circulation pump (9) is located on the displacement circuit and is used to drive the third medium to pass through the high-temperature heat storage tank (5) and the first heat exchanger (8) in sequence to form a closed loop. The vaporization circuit includes a turbine (10) and a fourth circulation pump (11), wherein the fourth circulation pump (11) is located on the vaporization circuit and is used to drive a fourth medium to pass sequentially through the first heat exchanger (8) and the turbine (10) to form a closed loop.

3. The combined cooling, heating and power system according to claim 2, characterized in that, The vaporization circuit also includes a second heat exchanger (12), and the fourth medium passes through the turbine (10), the second heat exchanger (12) and the first heat exchanger (8) in sequence. The power generation circuit also includes a cooling circuit, which includes a fifth circulation pump (13) and a cooler (14). The fifth circulation pump (13) is installed on the cooling circuit to drive the fifth medium through the second heat exchanger (12) and the cooler (14) in sequence to form a closed loop.

4. The combined cooling, heating and power system according to claim 1, characterized in that, The secondary heat storage circuit also includes a third heat exchanger (7), and the second medium passes through the high-temperature heat storage tank (5), the third heat exchanger (7) and the low-temperature heat storage tank (2) in sequence.

5. The combined cooling, heating and power system according to claim 4, characterized in that, The heat-using circuit includes a low-temperature heat-using circuit; The low-temperature heat circuit includes a sixth circulation pump (16), which is installed on the low-temperature heat circuit and is used to drive the sixth medium to pass through the low-temperature heat storage tank (2) and the user heat end (15) in sequence to form a closed loop.

6. The combined cooling, heating and power system according to claim 5, characterized in that, The heat circuit further includes a high-temperature heat circuit, which includes a seventh circulation pump (26). The seventh circulation pump (26) is installed on the high-temperature heat circuit and is used to drive the seventh medium to pass through the third heat exchanger (7) and the user heat end (15) in sequence to form a closed loop.

7. The combined cooling, heating and power system according to any one of claims 1-6, characterized in that, The user-use cooling circuit generates a cold source and transmits the cold source to the user-use cooling end (27), which includes a cold source generation circuit and a cold source transmission circuit; The cold source generation circuit is an absorption refrigeration system, which includes an eighth circulation pump (17). The eighth circulation pump (17) is installed on the cold source generation circuit and is used to drive the eighth medium to pass through the generator (18), condenser (19), throttle valve (20), evaporator (21) and absorber (22) that form a closed loop in sequence. The cold source transfer circuit includes a ninth circulation pump (23), which is installed on the cold source transfer circuit to drive the ninth medium to pass through the evaporator (21) and the user's cold end (27) in sequence to form a closed loop; The generator (18) is thermally coupled to the low-temperature heat storage tank (2) and the high-temperature heat storage tank (5).

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