A combined cooling, heating and power system and its working method

Abstract

The present invention discloses a combined cooling, heating and power system and a working method thereof, belonging to the field of energy utilization technology. The system comprises an S-CO2 heater, an S-CO2 expander, a first generator, a first regenerator, a heat exchanger, a first Kalina generator, a compressor, an electric motor, a second Kalina generator, a precooler, a gas-liquid separator, a Kalina expander, a second generator, a mixer, a condenser, a second regenerator, a first throttle valve, an ejector, a second throttle valve and an evaporator. The heat transfer medium heated by solar energy first drives the S-CO2 power generation and heating module, and then uses the remaining heat to drive the Kalina power generation and refrigeration module, which can realize the cascade utilization of thermal energy and improve the energy utilization efficiency; and can meet the summer cooling and winter heating needs while generating electricity; at the same time, the system is simple and flexible, and can meet the needs of different users.

Description

Technical Field

[0001] The invention belongs to the technical field of energy utilization, and in particular relates to a combined cooling, heating and power system and a working method thereof. Background Art

[0002] With the rapid development of economy, people's demand for electric energy is increasing, which accelerates the consumption of primary energy and environmental pollution, so we have to turn our attention to renewable energy generation. As the most potential renewable energy, solar energy has abundant reserves and can sustain human survival.

[0003] Carbon dioxide has a low critical point (31°C / 7.4MPa) and is easy to reach a supercritical state. It also has the advantages of being non-toxic, chemically stable, and easily available. Therefore, the power cycle using supercritical CO2 (S-CO2) as the working fluid has received widespread attention from academia and industry.

[0004] In the medium and low temperature waste heat recovery technology, the Kalina cycle with ammonia water mixture as the working fluid has a variable temperature process in which the evaporation and condensation process can be well matched with the variable temperature characteristics of the heat source, reducing the irreversible loss in the heat exchange process and thus improving the utilization rate of thermal energy.

[0005] The patent "A combined power supply system based on organic Rankine cycle and supercritical carbon dioxide cycle" (publication number CN110905611A) discloses a combined power supply system based on organic Rankine cycle and supercritical carbon dioxide cycle. Under certain cold and heat source conditions, it can meet the requirements of winter power generation and heating and summer power generation. However, this system is only suitable for extremely cold areas and cannot meet the needs of summer cooling. At the same time, the price of organic working fluids is relatively expensive, and some are toxic, which also restricts the widespread application of this system. Summary of the invention

[0006] In order to solve the above problems, the purpose of the present invention is to provide a combined heat, cooling and power system and a working method thereof. The system is reasonably constructed, can realize the cascade utilization of thermal energy, and improve the energy utilization efficiency.

[0007] The present invention is achieved through the following technical solutions:

[0008] The present invention discloses a combined cooling, heating and power system, comprising an S-CO2 heater, an S-CO2 expander, a first generator, a first regenerator, a heat exchanger, a first Kalina generator, a compressor, an electric motor, a second Kalina generator, a precooler, a gas-liquid separator, a Kalina expander, a second generator, a mixer, a condenser, a second regenerator, a first throttle valve, an ejector, a second throttle valve and an evaporator;

[0009] The hot side of the S-CO2 heater is connected to a solar heating system, and the cold side outlet is connected to the S-CO2 inlet of the S-CO2 expander; the output shaft of the S-CO2 expander is connected to the first generator, and the S-CO2 outlet is connected to the hot side inlet of the first regenerator; the hot side outlet of the first regenerator is connected to two branches, one of which is connected to the hot side inlet of the heat exchanger through a first valve, and the other is connected to the hot side inlet of the second Kalina generator through a second valve; the cold side of the heat exchanger exchanges heat with the heating network, the hot side outlet of the heat exchanger is connected to the hot side inlet of the first Kalina generator, the hot side outlet of the first Kalina generator is connected to a compressor, the compressor is connected to the cold side inlet of the first regenerator, the cold side outlet of the first regenerator is connected to the cold side inlet of the S-CO2 heater, and the compressor is driven by an electric motor; the hot side outlet of the second Kalina generator is connected to the hot side inlet of the precooler, and the hot side outlet of the precooler is connected to the compressor;

[0010] The cold side outlet of the first Kalina generator and the cold side outlet of the second Kalina generator are both connected to the inlet of the gas-liquid separator, the gas phase outlet of the gas-liquid separator is connected to the inlet of the Kalina expander, and the liquid phase outlet is connected to the hot side inlet of the second regenerator; the output shaft of the Kalina expander is connected to the second generator; the outlet of the Kalina expander is connected to the inlet of the mixer; the hot side outlet of the second regenerator is connected to two branches, one of which is connected to the first throttle valve through the fifth valve, and the other branch is connected to the fluid inlet of the ejector through the sixth valve, and the fluid outlet of the ejector and The first throttle valves are all connected to the inlet of the mixer; the outlet of the mixer is connected to the hot side inlet of the condenser, the hot side outlet of the condenser is connected to two branches, one of which is connected to the second throttle valve through the seventh valve, and the other branch is connected to the cold side inlet of the second regenerator, the second throttle valve is connected to the cold side inlet of the evaporator, and the cold side outlet ejector of the evaporator is connected to the injected fluid inlet; the cold side outlet of the second regenerator is connected to two branches, one of which is connected to the cold side inlet of the first Kalina generator through the third valve, and the other is connected to the cold side inlet of the second Kalina generator through the fourth valve.

[0011] Preferably, the solar heating system comprises a solar heat absorber and a first circulation pump. The solar heat absorber forms a circulation loop with the hot side of the S-CO2 heater through a pipeline, and the first circulation pump is arranged on the circulation loop.

[0012] Preferably, a second circulation pump is provided on the pipeline between the hot side outlet of the condenser and the cold side inlet of the second heat regenerator.

[0013] Preferably, the S-CO2 expander, the compressor and the Kalina expander are coaxially arranged.

[0014] Preferably, the compressor is a multi-stage centrifugal compressor.

[0015] Preferably, the cold side inlet of the first regenerator and the hot side outlet of the precooler are connected with a premixing device, and the premixing device is connected with the compressor.

[0016] Preferably, the cold side outlet of the first Kalina generator and the cold side outlet of the second Kalina generator are connected with a premixing device, and the premixing device is connected with the inlet of the gas-liquid separator.

[0017] The working method of the above-mentioned combined cooling, heating and power system disclosed in the present invention comprises:

[0018] After the S-CO2 is reheated in the first reheater, it enters the S-CO2 heater and is heated by the heat transfer medium that has absorbed the heat from the solar heating system. The high-temperature and high-pressure S-CO2 enters the S-CO2 expander to expand and do work, driving the first generator to generate electricity. After doing work, the S-CO2 enters the first reheater for waste heat recovery and diversion. One branch enters the heat exchanger to supply heat to the heating network, and then enters the first Kalina generator; the other branch directly enters the second Kalina generator, and then enters the precooler to further cool to near the critical point; then the two branches merge at the compressor inlet and enter the compressor for compression, and finally enter the first reheater to complete the cycle;

[0019] The basic ammonia solution after heat recovery in the second regenerator is split, one branch enters the first Kalina generator to recover waste heat; the other branch enters the second Kalina generator to recover waste heat; the two branches are mixed and enter the gas-liquid separator, where they are separated into saturated ammonia-rich vapor and saturated ammonia-lean solution. The high-temperature and high-pressure saturated ammonia-rich vapor enters the Kalina expander to expand and do work, driving the second generator to generate electricity; the saturated ammonia-lean solution enters the second regenerator for waste heat recovery and is split, one branch passes through the first throttle valve for throttling and pressure reduction, and the other branch enters the ejector to use its high-pressure energy to eject the low-temperature and low-pressure fluid at the cold side outlet of the evaporator; the fluids of the two branches enter the mixer with the ammonia-rich vapor after work for isobaric mixing, and then enter the condenser to condense into a supercooled basic ammonia solution, and are split, one branch enters the evaporator after throttling and pressure reduction by the second throttle valve to absorb the heat of the refrigerant and cool outward, and then enters the ejector as the ejected fluid; the other branch is transported to the second regenerator to complete the whole cycle.

[0020] Preferably, in summer, the first valve, the third valve and the fifth valve are closed, and the second valve, the fourth valve, the sixth valve and the seventh valve are opened; in winter, the first valve, the third valve and the fifth valve are opened, and the second valve, the fourth valve, the sixth valve and the seventh valve are closed.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] The present invention discloses a combined cooling, heating and power system, which utilizes solar energy to drive the S-CO2 power generation and heating module, and further drives the Kalina power generation and refrigeration module, so as to meet the summer cooling and winter heating needs while generating electricity. The heat transfer medium heated by solar energy first drives the S-CO2 power generation and heating module, and then uses the remaining heat to drive the Kalina power generation and refrigeration module, which can realize the cascade utilization of thermal energy and improve the energy utilization efficiency. The working fluid used in the S-CO2 power generation and heating module is CO2, which has the advantages of being non-toxic, having good chemical stability, and being easy to obtain; the working fluid used in the Kalina power generation and refrigeration module is an ammonia solution, which can well match the temperature variation characteristics of the heat source, reduce the irreversible loss in the heat exchange process, and improve the utilization rate of thermal energy.

[0023] Furthermore, the S-CO2 expander, the compressor and the Kalina expander are coaxially arranged, and the system is compact, which can reduce the occupied area.

[0024] Furthermore, the compressor adopts a multi-stage centrifugal compressor with high pressure ratio and high efficiency.

[0025] Furthermore, the cold side inlet of the first regenerator and the hot side outlet of the precooler are connected with a premixing device, which can fully mix the CO2 before entering the compressor, balance the pressure and temperature, and improve the operating stability of the compressor.

[0026] Furthermore, the cold side outlet of the first Kalina generator and the cold side outlet of the second Kalina generator are connected with a premixing device to fully mix the two ammonia aqueous solutions entering the gas-liquid separator, balance the pressure and temperature, and improve the operating stability of the gas-liquid separator.

[0027] The working method of the combined cooling, heating and power system disclosed in the present invention has a high degree of automation, can realize the cascade utilization of thermal energy, and improve the energy utilization efficiency.

[0028] Furthermore, while generating electricity, it can also meet the cooling needs in summer and the heating needs in winter, thus satisfying the different needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the system of the present invention.

[0030] In the figure: 1 is a solar thermal absorber; 2 is an S-CO2 heater; 3 is a first circulation pump; 4 is an S-CO2 expander; 5 is a first generator; 6 is a first regenerator; 7 is a first valve; 8 is a heat exchanger; 9 is a heating network; 10 is a first Kalina generator; 11 is a compressor; 12 is an electric motor; 13 is a second valve; 14 is a second Kalina generator; 15 is a precooler; 16 is a third valve; 17 is a fourth valve; 18 is a gas-liquid separator; 19 is a Kalina expander; 20 is a second generator; 21 is a mixer; 22 is a condenser; 23 is a second circulation pump; 24 is a second regenerator; 25 is a fifth valve; 26 is a first throttle valve; 27 is a sixth valve; 28 is an ejector; 29 is a seventh valve; 30 is a second throttle valve; 31 is an evaporator. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, the contents of which are intended to explain the present invention rather than to limit it:

[0032] like Figure 1, is a combined cooling, heating and power system of the present invention, and its main devices include: a solar thermal absorber 1, used for receiving concentrated solar radiation energy; an S-CO2 heater 2, used for heating S-CO2; a first circulating pump 3, pressurizing the heat transfer medium from the S-CO2 heater 2 and conveying it to the solar thermal absorber 1; an S-CO2 expander 4, used for S-CO2 expansion to do work and convert thermal energy into mechanical energy; a first generator 5, converting the mechanical energy from the S-CO2 expander 4 into electrical energy; a first regenerator 6, using the expanded exhaust gas to preheat the S-CO2, and the hot side outlet is split, and the two branches are connected to the first valve 7 and the second valve 13 respectively; the inlet of the first valve 7 is connected to the hot side outlet of the first regenerator 6 The outlet is connected to the hot side inlet of the heat exchanger 8 for regulating the flow of the branch; the heat exchanger 8 is used for supplying heat to the outside and is provided with a hot side inlet, a hot side outlet, a cold side inlet and a cold side outlet, the hot side inlet is connected to the outlet of the first valve 7, the hot side outlet is connected to the hot side inlet of the first Kalina generator 10, the cold side inlet is connected to the outlet of the heating pipe network 9, and the cold side outlet is connected to the inlet of the heating pipe network 9; the heating pipe network 9 is used to transport heat to the user; the first Kalina generator 10 is used to absorb the heat of S-CO2 and heat the low-temperature ammonia water mixture, and is provided with a hot side inlet, a hot side outlet, a cold side inlet and a cold side outlet, the hot side inlet is connected to the hot side outlet of the heat exchanger 8, the hot side outlet is connected to the hot side outlet of the heat exchanger 8, the hot side outlet is connected to the hot side outlet of the heat exchanger 8, and the cold side outlet is connected to the hot side outlet of the heat exchanger 8. The side outlet is connected to the inlet of the compressor 11, the cold side inlet is connected to the outlet of the third valve 16, and the cold side outlet is connected to the inlet of the gas-liquid separator 18; the compressor 11 is used to compress S-CO2, and a multi-stage centrifugal compressor with advantages such as high pressure ratio and high efficiency can be used; the motor 12 is used to drive the compressor 11 to operate normally and convert electrical energy into mechanical energy; the inlet of the second valve 13 is connected to the hot side outlet of the first regenerator 6, and the outlet is connected to the hot side inlet of the second Kalina generator 14, which is used to adjust the flow of the branch; the second Kalina generator 14 is used to absorb the heat of S-CO2 and heat the low-temperature ammonia water mixture, and is provided with a hot side inlet, a hot side outlet, and a cold side inlet The hot side inlet is connected to the outlet of the second valve 13, the hot side outlet is connected to the hot side inlet of the precooler 15, the cold side inlet is connected to the outlet of the fourth valve 17, and the cold side outlet is connected to the inlet of the gas-liquid separator 18; the precooler 15 is used to further cool the S-CO2 to near the critical point, thereby reducing the power consumed by the compressor 11; the inlet of the third valve 16 is connected to the cold side outlet of the second regenerator 24, and the outlet is connected to the cold side inlet of the first Kalina generator 10, which is used to adjust the flow rate of the branch; the inlet of the fourth valve 17 is connected to the cold side outlet of the second regenerator 24, and the outlet is connected to the cold side inlet of the second Kalina generator 14, which is used to adjust the flow rate of the branch;The gas-liquid separator 18 separates the two-phase ammonia solution into saturated ammonia-rich vapor and saturated ammonia-lean solution, and is provided with two outlets, namely a gas phase outlet and a liquid phase outlet. The gas phase outlet is connected to the inlet of the Kalina expander 19, and the liquid phase outlet is connected to the hot side inlet of the second regenerator 24; the Kalina expander 19 is used to expand the saturated ammonia-rich vapor to do work and convert thermal energy into mechanical energy; the second generator 20 is used to convert the mechanical energy from the Kalina expander 19 into electrical energy; the mixer 21 is used to mix ammonia solutions of different temperatures; the condenser 22 is used to convert the mixed gas at the outlet of the mixer 21 into electrical energy; The combined ammonia solution is condensed into a supercooled basic ammonia solution, and the hot side outlet is split into two branches connected to the seventh valve 29 and the inlet of the second circulation pump 23 respectively; the second circulation pump 23 pressurizes part of the basic ammonia solution from the condenser 22 and transports it to the second regenerator 24; the second regenerator 24 uses the heat of the saturated lean ammonia solution from the liquid phase outlet of the gas-liquid separator 18 to heat the basic ammonia solution at the outlet of the second circulation pump 23, thereby increasing the temperature entering the inlet of the first Kalina generator 10 and the second Kalina generator 14, thereby improving the thermal efficiency of the system, and the cold side outlet is split into two branches. The inlet of the fifth valve 25 is connected to the hot side outlet of the second regenerator 24, and the outlet is connected to the inlet of the first throttle valve 26, which is used to adjust the flow rate of the branch; the first throttle valve 26 reduces the pressure of the lean ammonia solution from the outlet of the fifth valve 25 to the same pressure as the outlet of the Kalina expander 19; the inlet of the sixth valve 27 is connected to the hot side outlet of the second regenerator 24, and the outlet is connected to the fluid inlet of the ejector 28, which is used to adjust the flow rate of the branch; the ejector 28 uses the high pressure energy of the lean ammonia solution from the outlet of the sixth valve 27 to eject the cold side outlet of the evaporator 31 The low-temperature and low-pressure fluid of the condenser 22 is used to improve the refrigeration effect. The condenser 22 is provided with a fluid inlet, an ejected fluid inlet and a fluid outlet. The fluid inlet is connected to the outlet of the sixth valve 27, the ejected fluid inlet is connected to the cold side outlet of the evaporator 31, and the fluid outlet is connected to the inlet of the mixer 21; the inlet of the seventh valve 29 is connected to the hot side outlet of the condenser 22, and the outlet is connected to the inlet of the second throttle valve 30, which is used to adjust the flow of the branch; the second throttle valve 30 is used to reduce the pressure of the basic ammonia solution from the outlet of the seventh valve 29; the evaporator 31, the low-temperature and low-pressure two-phase ammonia solution absorbs the heat of the refrigerant and transmits cold capacity to the outside. ;

[0033] The working method of the above combined cooling, heating and power system is as follows:

[0034] The system comprises an S-CO2 power generation and heating module and a Kalina power generation and refrigeration module. The S-CO2 power generation and heating module uses CO2 as a working fluid, and the Kalina power generation and refrigeration module uses an ammonia-water mixture as a working fluid.

[0035] S-CO2 power generation and heating module workflow:

[0036] After the S-CO2 is reheated in the first reheater 6, it enters the S-CO2 heater 2 and is heated by the heat transfer medium that has absorbed the heat from the sun. The high-temperature and high-pressure S-CO2 enters the S-CO2 expander 4 to expand and work, driving the first generator 5 to generate electricity. The S-CO2 after work enters the first reheater 6 for waste heat recovery and is split. One branch enters the heat exchanger 8 to supply heat to the outside, and then enters the first Kalina generator 10 to drive the Kalina power generation and refrigeration module; the other branch directly enters the second Kalina generator 14 to drive the Kalina power generation and refrigeration module, and then enters the precooler 15 to further cool to near the critical point. Then the two branches meet at the inlet of the compressor 11 and enter the compressor 11 for compression, and finally enter the first reheater 6 to complete the cycle.

[0037] Kalina power generation and cooling module workflow:

[0038] After the basic ammonia solution is reheated in the second reheater 24, it is split into two streams: one stream enters the first Kalina generator 10 to recover the waste heat of the S-CO2 power generation and heating module; the other stream enters the second Kalina generator 14 to recover the waste heat of the S-CO2 power generation and heating module. The two streams are mixed and enter the gas-liquid separator 18, where they are separated into saturated ammonia-rich vapor and saturated ammonia-poor solution. The high-temperature and high-pressure saturated ammonia-rich vapor enters the Kalina expander 19 to expand and do work, driving the second generator 20 to generate electricity; the saturated ammonia-poor solution enters the second reheater 24 to recover the waste heat, and is split into two streams: one stream passes through the first throttle valve 26 for throttling and pressure reduction, and the other stream enters the ejector 28 to use its high-pressure energy to eject the low-temperature and low-pressure fluid at the cold side outlet of the evaporator 31. The two fluids enter the mixer 21 with the ammonia-rich vapor after work for isobaric mixing, and then enter the condenser 22 to condense into a supercooled basic ammonia solution and are split. One fluid enters the evaporator 31 to absorb the heat of the refrigerant after throttling and reducing the pressure at the second throttle valve 30, and cools the outside, and then enters the ejector 28 as the ejected fluid; the other fluid enters the second circulation pump 23 for pressurization and is transported to the second regenerator 24 to complete the whole cycle.

[0039] When the system is used in summer, the first valve 7, the third valve 16 and the fifth valve 25 are closed, and the second valve 13, the fourth valve 17, the sixth valve 27 and the seventh valve 29 are opened.

[0040] When used in winter, the second valve 13, the fourth valve 17, the sixth valve 27 and the seventh valve 29 are closed, and the first valve 7, the third valve 16 and the fifth valve 25 are opened.

[0041] In this system, the S-CO2 expander 4, the compressor 11 and the Kalina expander 19 can be arranged to be coaxially or non-coaxially connected according to actual needs.

[0042] In this system, each device is connected through pipelines.

[0043] The above is only part of the embodiments of the present invention. Although some terms are used in the present invention, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional restrictions. The above is only to further illustrate the content of the present invention with examples for easier understanding, but it does not mean that the embodiments of the present invention are limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention.

Claims

1. A combined cooling, heating and power system, characterized in that: The invention comprises an S-CO2 heater (2), an S-CO2 expander (4), a first generator (5), a first regenerator (6), a heat exchanger (8), a first Kalina generator (10), a compressor (11), an electric motor (12), a second Kalina generator (14), a precooler (15), a gas-liquid separator (18), a Kalina expander (19), a second generator (20), a mixer (21), a condenser (22), a second regenerator (24), a first throttle valve (26), an ejector (28), a second throttle valve (30) and an evaporator (31); The hot side of the S-CO2 heater (2) is connected to a solar heating system, and the cold side outlet is connected to the S-CO2 inlet of the S-CO2 expander (4); the output shaft of the S-CO2 expander (4) is connected to the first generator (5), and the S-CO2 outlet is connected to the hot side inlet of the first regenerator (6); the hot side outlet of the first regenerator (6) is connected to two branches, one of which is connected to the hot side inlet of the heat exchanger (8) through a first valve (7), and the other branch is connected to the hot side inlet of the second Kalina generator (14) through a second valve (13); the cold side of the heat exchanger (8) is connected to the heating pipe The hot side outlet of the heat exchanger (8) is connected to the hot side inlet of the first Kalina generator (10), the hot side outlet of the first Kalina generator (10) is connected to the compressor (11), the compressor (11) is connected to the cold side inlet of the first regenerator (6), the cold side outlet of the first regenerator (6) is connected to the cold side inlet of the S-CO2 heater (2), and the compressor (11) is driven by the motor (12); the hot side outlet of the second Kalina generator (14) is connected to the hot side inlet of the precooler (15), and the hot side outlet of the precooler (15) is connected to the compressor (11); The cold side outlet of the first Kalina generator (10) and the cold side outlet of the second Kalina generator (14) are both connected to the inlet of the gas-liquid separator (18); the gas phase outlet of the gas-liquid separator (18) is connected to the inlet of the Kalina expander (19), and the liquid phase outlet is connected to the hot side inlet of the second regenerator (24); the output shaft of the Kalina expander (19) is connected to the second generator (20); the outlet of the Kalina expander (19) is connected to the inlet of the mixer (21); the hot side outlet of the second regenerator (24) is connected to two branches, one of which is connected to the first throttle valve (26) through the fifth valve (25), and the other branch is connected to the fluid inlet of the ejector (28) through the sixth valve (27); the fluid outlet of the ejector (28) and the first The throttle valves (26) are connected to the inlet of the mixer (21); the outlet of the mixer (21) is connected to the hot side inlet of the condenser (22); the hot side outlet of the condenser (22) is connected to two branches, one of which is connected to the second throttle valve (30) through the seventh valve (29), and the other branch is connected to the cold side inlet of the second regenerator (24); the second throttle valve (30) is connected to the cold side inlet of the evaporator (31), and the ejected fluid inlet of the cold side outlet ejector (28) of the evaporator (31) is connected; the cold side outlet of the second regenerator (24) is connected to two branches, one of which is connected to the cold side inlet of the first Kalina generator (10) through the third valve (16), and the other is connected to the cold side inlet of the second Kalina generator (14) through the fourth valve (17).

2. The combined cooling, heating and power system according to claim 1, characterized in that: The solar heating system comprises a solar heat absorber (1) and a first circulation pump (3). The solar heat absorber (1) forms a circulation loop with the hot side of the S-CO2 heater (2) through a pipeline, and the first circulation pump (3) is arranged on the circulation loop.

3. The combined cooling, heating and power system according to claim 1, characterized in that: A second circulation pump (23) is provided on the pipeline between the hot side outlet of the condenser (22) and the cold side inlet of the second heat regenerator (24).

4. The combined cooling, heating and power system according to claim 1, characterized in that: The S-CO2 expander (4), the compressor (11) and the Kalina expander (19) are coaxially arranged.

5. The combined cooling, heating and power system according to claim 1, characterized in that: The compressor (11) is a multi-stage centrifugal compressor.

6. The combined cooling, heating and power system according to claim 1, characterized in that: The cold side inlet of the first regenerator (6) and the hot side outlet of the precooler (15) are connected to a premixing device, and the premixing device is connected to the compressor (11).

7. The combined cooling, heating and power system according to claim 1, characterized in that: The cold side outlet of the first Kalina generator (10) and the cold side outlet of the second Kalina generator (14) are connected to a premixing device, and the premixing device is connected to the inlet of the gas-liquid separator (18).

8. The working method of the combined cooling, heating and power system according to any one of claims 1 to 7, characterized in that: include: After being reheated in the first reheater (6), the S-CO2 enters the S-CO2 heater (2) and is heated by the heat transfer medium that has absorbed the heat from the solar heating system. The high-temperature and high-pressure S-CO2 enters the S-CO2 expander (4) to expand and perform work, driving the first generator (5) to generate electricity. After performing work, the S-CO2 enters the first reheater (6) to recover the waste heat and is diverted. One branch enters the heat exchanger (8) to supply heat to the heating network (9), and then enters the first Kalina generator (10); the other branch directly enters the second Kalina generator (14), and then enters the precooler (15) to be further cooled to near the critical point; then the two branches merge at the inlet of the compressor (11), enter the compressor (11) for compression, and finally enter the first reheater (6) to complete the cycle; After the basic ammonia solution has been reheated in the second reheater (24), it is split into two branches: one branch enters the first Kalina generator (10) to recover waste heat; the other branch enters the second Kalina generator (14) to recover waste heat; the two branches are mixed and then enter the gas-liquid separator (18), where they are separated into saturated ammonia-rich vapor and saturated ammonia-poor solution; the high-temperature and high-pressure saturated ammonia-rich vapor enters the Kalina expander (19) to expand and perform work, driving the second generator (20) to generate electricity; the saturated ammonia-poor solution enters the second reheater (24) to recover waste heat and .... One branch passes through the first throttle valve (26) to throttle and reduce the pressure, and the other branch enters the ejector (28) to use its high pressure energy to eject the low-temperature and low-pressure fluid at the cold side outlet of the evaporator (31); the fluids of the two branches and the ammonia-rich vapor after work enter the mixer (21) for isobaric mixing, and then enter the condenser (22) to condense into a supercooled basic ammonia solution, and are divided. One branch enters the evaporator (31) after throttling and reducing the pressure of the second throttle valve (30) to absorb the heat of the refrigerant and cool it outward, and then enters the ejector (28) as the ejected fluid; the other branch is transported to the second regenerator (24) to complete the whole cycle.

9. The working method of the combined cooling, heating and power system according to claim 8, characterized in that: In summer, the first valve (7), the third valve (16) and the fifth valve (25) are closed, and the second valve (13), the fourth valve (17), the sixth valve (27) and the seventh valve (29) are opened; in winter, the first valve (7), the third valve (16) and the fifth valve (25) are opened, and the second valve (13), the fourth valve (17), the sixth valve (27) and the seventh valve (29) are closed.

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