An integrated energy cycle system and method

Abstract

The application discloses a kind of comprehensive energy circulation system and method, it is related to energy utilization field, including energy storage system and power generation system, energy storage system includes multistage compression-heat exchange system, multistage compression-heat exchange system is sequentially communicated in refrigeration expander, refrigeration heat exchanger's cold flow import, refrigeration heat exchanger's cold flow export is communicated in atmosphere, and refrigeration heat exchanger is used to heat exchange with refrigeration medium;Heating heat exchanger in multistage compression-heat exchange system is used to heat exchange with heating medium;Power generation system includes boiler and power generation circulation loop, and heating medium that obtains heat can be heat exchanged with water that flows back to boiler in gas-water heat exchanger in power generation circulation loop.The application organically combines multiple energy systems, realizes that heat and cold can be stored, and heat and cold of redundant part of system can be provided externally, according to actual demand, cold, heat, electricity supply or combined supply, operation and profit mode are more rich, adapt to wide scene, engineering application potential is huge.

Description

Technical Field

[0001] This invention relates to the field of energy utilization, and in particular to an integrated energy cycle system and method. Background Technology

[0002] Currently, newly built thermal power units are still considered based on traditional coal-fired power units, without taking into account the development needs of future new power systems. Moreover, the flexible adjustment capabilities of my country's existing coal-fired power units still have considerable room for improvement. For example, in conventional Rankine cycles in thermal power plants, there are high-pressure heaters, and the operation of these heaters requires a high amount of heat energy. Another example is conventional compressed air energy storage systems, which require the storage of high-pressure air, and the high-pressure air storage tanks are usually buried underground, thus requiring a large land area and being highly dependent on geographical conditions. Yet another example is conventional refrigeration systems, which require a large number of compressors and a significant amount of electricity. Therefore, while pursuing the improvement of the quality and efficiency of coal-fired power units, it is necessary to explore new forms of energy utilization for thermal power units beyond their inherent models and seek comprehensive energy systems that can be adapted to the future power structure. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems by providing a comprehensive energy cycle system and method that organically combines a combined cooling, heating, and power (CCHP) system with thermal energy storage, air and steam dual-medium, and Breton and Rankine dual-cycle systems. This system can store both heat and cold, and can provide the redundant heat and cold energy to external systems. It can supply or combine cooling, heating, and electricity according to actual needs, resulting in more diverse operation and profit models, a wider range of applicable scenarios, and great potential for engineering applications.

[0004] The technical solution adopted in this invention is as follows: A comprehensive energy cycle system includes an energy storage system and a power generation system. The energy storage system includes a multi-stage compression-heat exchange system. The outlet of the multi-stage compression-heat exchange system is connected to the inlet of a refrigeration expander. The outlet of the refrigeration expander is connected to the cold flow inlet of a refrigeration heat exchanger. The cold flow outlet of the refrigeration heat exchanger is connected to the atmosphere. The hot flow inlet of the refrigeration heat exchanger is used to enter the refrigerant. The hot flow outlet of the refrigeration heat exchanger is connected to a refrigerant storage tank. A heating refrigerant cold storage tank exists within the multi-stage compression-heat exchange system. The cold flow inlet of the heating heat exchanger is connected, and the cold flow outlet of the heat exchanger is connected to the inlet of the heating medium hot storage tank; the power generation system includes a boiler and a power generation circulation loop, the steam turbine at the uppermost end of the power generation circulation loop is connected to the steam outlet of the boiler, and multiple gas-water heat exchangers are sequentially located at the lowermost end of the power generation circulation loop, and the gas-water heat exchangers are sequentially connected and finally connected to the inlet of the boiler; the hot flow inlet of the gas-water pipe is connected to the outlet of the heating medium hot storage tank, and the hot flow outlet of the gas-water heat exchanger is connected to the inlet of the heating medium cold storage tank.

[0005] Furthermore, the multi-stage compression-heat exchange system includes multiple compressors and multiple heat exchangers connected sequentially and alternately. Along the direction of air flow, the upstream compressor is connected to the atmosphere, the outlet of the upstream compressor is connected to the heat flow inlet of the adjacent downstream heat exchanger, the heat flow outlet of the heat exchanger is connected to the inlet of the adjacent downstream compressor, and the heat flow outlet of the downstream heat exchanger is connected to the inlet of the refrigeration expander.

[0006] Furthermore, the number of heat exchangers connected in series between the heating medium hot storage tank and the heating medium cold storage tank is one or more, and the number of heat exchangers connected in series is selected according to the temperature at which the heating medium needs to be stored in the heating medium hot storage tank.

[0007] Furthermore, the rotating shaft of the refrigeration expander is connected to the rotating shaft of the small generator.

[0008] Furthermore, the steam turbine in the power generation cycle includes a high-pressure cylinder, an intermediate-pressure cylinder, and a low-pressure cylinder. The boiler outlet is connected to the inlet of the high-pressure cylinder and the intermediate-pressure cylinder, and the high-pressure cylinder outlet is connected to the boiler inlet. The intermediate-pressure cylinder outlet is connected to the low-pressure cylinder inlet. The rotating shafts of the high-pressure cylinder, the intermediate-pressure cylinder, and the low-pressure cylinder are coaxial and connected to the rotating shaft of the large generator.

[0009] Furthermore, the outlet of the low-pressure cylinder is connected to the condenser, the outlet of the condenser is connected to the shaft seal heater via a water pump, the outlet of the shaft seal heater is connected to multiple low-pressure heaters, the multiple low-pressure heaters are connected in series, the heat flow inlet of the shaft seal heater is connected to the condenser, and the heat flow outlet of the shaft seal heater is connected to the inlet of the condenser.

[0010] Furthermore, the outlet of the low-pressure heater is connected to the inlet of the deaerator, and the outlet of the deaerator is connected to the upstream gas-water heat exchanger.

[0011] Furthermore, the outlet of the intermediate-pressure cylinder is connected to the heat flow inlet of the low-pressure heater located further downstream, and the outlet of the low-pressure cylinder is connected to the heat flow inlet of the low-pressure heater located further upstream; the heat flow outlet of the low-pressure heater is connected to the inlet of the condenser.

[0012] Furthermore, the heating medium in the heating medium storage tank serves as a heat source for all gas-water heat exchangers, the steam entering the deaerator, the steam entering the low-pressure heater, and the steam entering the low-pressure cylinder.

[0013] An integrated energy cycle method, utilizing the aforementioned integrated energy cycle, includes the following steps: S1: After being compressed and heated by the multi-stage compression-heat exchange system, the air enters the refrigeration expander to expand and do work, driving a small generator to generate electricity; then it enters the refrigeration heat exchanger to exchange heat with the refrigerant, and after the temperature of the refrigerant is reduced, it is discharged into the atmosphere; the refrigerant enters the refrigerant storage tank for storage. S2: Simultaneously with step S1, the heating medium in the cold storage tank is heated after passing through the heating heat exchanger of the multi-stage compression-heat exchange system and then enters the hot storage tank for storage. S3: The high-pressure steam generated by the boiler enters the steam turbine and drives the turbine's rotating shaft to rotate. At the same time, the turbine's rotating shaft drives a large generator to generate electricity. S4: Steam flowing out of the low-pressure cylinder of the steam turbine enters the condenser to condense into liquid water. The liquid water in the condenser passes through the shaft seal heater and multiple low-pressure heaters in sequence, then through the deaerator and the gas-water heat exchanger for heat exchange and temperature increase, and then enters the boiler. S5: In step S4, the heating medium in the heating medium hot storage tank provides a heat source for all gas-water heat exchangers, steam entering the deaerator, steam entering the low-pressure heater, and steam entering the low-pressure cylinder. At the same time, the steam flowing out of the intermediate-pressure cylinder and low-pressure cylinder in the steam turbine also provides a heat source for the low-pressure heater. The heating medium that has passed through the gas-water heat exchanger, deaerator, low-pressure heater, and low-pressure cylinder flows back to the heating medium cold storage tank. After passing through the low-pressure heater, the steam phase changes to water, and the water flows back to the condenser.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The integrated energy system and method proposed in this invention can store both heat and cold energy. The redundant heat and cold energy of the system can be provided to external users. It can supply cold, heat, and electricity or combine them according to actual needs, making the operation and profit models more diverse, adapting to a wide range of scenarios, and having great potential for engineering applications. Attached Figure Description

[0015] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the system structure of the present invention; The diagram shows the following markings: 1-Compressor; 2-Heating heat exchanger; 3-Refrigeration expander; 4-Small generator; 5-Refrigeration heat exchanger; 6-Refrigeration working fluid storage tank; 7-Heating working fluid cold storage tank; 8-Heating working fluid hot storage tank; 9-Gas-water heat exchanger; 10-Deaerator; 11-Low-pressure heater; 12-Shaft seal heater; 13-Condenser; 14-Large generator; 15-Low-pressure cylinder; 16-Medium-pressure cylinder; 17-High-pressure cylinder; 18-Boiler. Detailed Implementation

[0016] In the description of this specification, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0017] Furthermore, the use of terms such as "horizontal" or "vertical" in this specification does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0018] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “connect” should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components.

[0019] In this embodiment, for heat exchangers and heaters, hot flow and cold flow are compared by their temperatures when entering the heat exchanger or heater. That is, the medium temperature at the hot flow inlet is higher than the medium temperature at the cold flow inlet. The cold flow outlet is connected to the cold flow inlet, and the hot flow outlet is connected to the hot flow inlet.

[0020] Example 1 like Figure 1As shown, an integrated energy cycle system includes an energy storage system and a power generation system. The energy storage system includes a multi-stage compression-heat exchange system. The outlet of the multi-stage compression-heat exchange system is connected to the inlet of a refrigeration expander 3. The outlet of the refrigeration expander 3 is connected to the cold flow inlet of a refrigeration heat exchanger 5. The cold flow outlet of the refrigeration heat exchanger 5 is connected to the atmosphere. The hot flow inlet of the refrigeration heat exchanger 5 is used to introduce the refrigerant. The hot flow outlet of the refrigeration heat exchanger 5 is connected to a refrigerant storage tank 6. A heating refrigerant cold storage tank 7 is present, which is connected to the heating heat exchanger 2 in the multi-stage compression-heat exchange system. The cold flow inlet is connected, and the cold flow outlet of the heat exchanger is connected to the inlet of the heating medium storage tank 8; the power generation system includes a boiler 18 and a power generation circulation loop. The steam turbine at the uppermost end of the power generation circulation loop is connected to the steam outlet of the boiler 18, and multiple gas-water heat exchangers 9 are sequentially located at the lowermost end of the power generation circulation loop. The gas-water heat exchangers 9 are sequentially connected and finally connected to the inlet of the boiler 18; the hot flow inlet of the hot gas in the gas-water pipe is connected to the outlet of the heating medium storage tank 8, and the hot flow outlet of the gas-water heat exchanger 9 is connected to the inlet of the heating medium cold storage tank 7.

[0021] In this embodiment, in the multi-stage compression-heat exchange system of the energy storage system, each stage compresses and heats the air to form high-pressure, high-temperature air. Then, in each stage, the air undergoes heat exchange through a heat exchanger to provide heat energy to the heating medium, raising its temperature. The refrigerant, after its temperature rises, enters a refrigerant storage tank for storage. Simultaneously, the air cools down, forming high-pressure, low-temperature air. This high-pressure, low-temperature air then enters a refrigeration expander 3 to release pressure and expand, further lowering its temperature to form low-pressure, ultra-low-temperature air. This low-pressure, ultra-low-temperature air enters a refrigeration heat exchanger 5 for heat exchange, cooling the refrigerant. After cooling, the refrigerant enters a refrigerant storage tank for storage, ready for later use. Simultaneously, the air is discharged into the atmosphere.

[0022] In this embodiment, for the power generation system, the boiler 18 generates high-temperature and high-pressure air which enters the power generation cycle loop to perform work and generate electricity. Finally, it passes through the gas-water heat exchanger 9, where the heat medium in the heat storage tank of the heating medium is used as the heat source for heat exchange. The water and steam in the power generation cycle loop are further heated and then enter the boiler 18 for use. After the heating medium releases heat, it flows back to the cold storage tank of the heating medium for storage.

[0023] In summary, it can be determined that the system disclosed in this embodiment, compared with conventional thermal power Rankine cycle, can eliminate each high-pressure heater while ensuring the same feedwater temperature, thereby allowing the high-parameter regenerative steam to be used for power generation, greatly increasing the power generation. Compared with conventional compressed air energy storage systems, there is no need to store high-pressure air, converting the potential energy of high-pressure air into thermal energy storage, eliminating the need for gas storage devices that occupy a large area and depend on geographical conditions. The system proposed in this embodiment only stores heat and cold, and the air working medium in the energy storage process uses natural atmosphere as the atmospheric pressure gas storage device, which can be used as needed, saving huge equipment investment, geographical location and maintenance costs. Compared with conventional refrigeration systems, compressor 1 and the heating medium share the same compressor 1, saving compressor 1 equipment and power investment.

[0024] Example 2 Based on Example 1, further feasible implementation methods are proposed.

[0025] In one feasible implementation, the multi-stage compression-heat exchange system includes two compressors 1 and two heat exchangers 2 connected sequentially and alternately. Along the direction of airflow, the upstream compressor 1 is connected to the atmosphere, and its outlet is connected to the heat inlet of the adjacent downstream heat exchanger 2. The heat outlet of the heat exchanger 2 is connected to the inlet of the adjacent downstream compressor 1, and the heat outlet of the downstream heat exchanger 2 is connected to the inlet of the refrigeration expander 3. That is, after passing through the upstream compressor 1, the air in the atmosphere experiences an increase in both pressure and temperature before entering the compressor. In heat exchanger 2, the air exchanges heat with the heating medium from the heating medium cold storage tank, causing the temperature of the heating medium to rise and the temperature of the air to fall. After flowing out of heat exchanger 2, the air enters the next stage compressor 1 for compression, further increasing the pressure and temperature. It then enters the next stage heat exchanger 2 again to exchange heat with the heating medium from the heating medium cold storage tank, causing the temperature of the heating medium to rise and the temperature of the air to fall. The high-temperature heating medium is stored in the heating medium hot storage tank for later use, while the high-pressure, low-temperature air enters the refrigeration expander 3 for expansion, causing the pressure to fall and the temperature to fall further.

[0026] In one feasible implementation, the number of heat exchangers 2 connected in series between the heating medium hot storage tank 8 and the heating medium cold storage tank 7 is one or more. The number of heat exchangers 2 connected in series is selected according to the temperature of the heating medium that the heating medium needs to be stored in the heating medium hot storage tank 8. By adjusting the number of heat exchangers 2 connected in series, the number of heat exchangers 2 through which the same heating medium passes can be adjusted, and the temperature of the heating medium can be further adjusted, so that the temperature of the heating medium stored in the heating medium hot storage tank 8 is adjustable.

[0027] In one feasible implementation, the rotating shaft of the refrigeration expander 3 is connected to the rotating shaft of the small generator 4. The high-pressure, low-temperature air from the multi-stage compression-heat exchange system does work when it expands in the expander, driving the small generator 4 to generate electricity.

[0028] In one feasible implementation, the steam turbine in the power generation cycle includes a high-pressure cylinder 17, an intermediate-pressure cylinder 16, and a low-pressure cylinder 15. The outlet of the boiler 18 is connected to the inlet of the high-pressure cylinder 17 and the intermediate-pressure cylinder 16, and the outlet of the high-pressure cylinder 17 is connected to the inlet of the boiler 18. The outlet of the intermediate-pressure cylinder 16 is connected to the inlet of the low-pressure cylinder 15. The rotating shafts of the high-pressure cylinder 17, the intermediate-pressure cylinder 16, and the low-pressure cylinder 15 are coaxial and connected to the rotating shaft of the large generator 14. The high-pressure steam generated by the boiler 18 drives the steam turbine, and the steam turbine drives the large generator 14 to generate electricity.

[0029] In one feasible implementation, the outlet of the low-pressure cylinder 15 is connected to the condenser 13, the outlet of the condenser 13 is connected to the shaft seal heater 12 via a water pump, the outlet of the shaft seal heater 12 is connected to multiple low-pressure heaters 11 connected in series, the heat flow inlet of the shaft seal heater 12 is connected to the condenser 13, the heat flow outlet of the shaft seal heater 12 is connected to the inlet of the condenser 13, the outlet of the low-pressure heater 11 is connected to the inlet of the deaerator 10, and the outlet of the deaerator 10 is connected to the upstream gas-water heat exchanger 9; that is, the steam discharged from the low-pressure cylinder 15 enters the condenser 13 for cold-end heat dissipation and condensation, and after condensation into water, it is pressurized by the water pump and enters the shaft seal heater 12, multiple low-pressure heaters 11, and deaerator 10 in sequence. After deoxygenation of the feedwater in the deaerator 10, it is pressurized by the water pump and enters the multiple gas-water heat exchangers 9 in sequence. After sufficient heat exchange and temperature increase, it enters the boiler 18.

[0030] It can be seen that, in this process, the difference from the conventional Rankine cycle system of thermal power is that the high-pressure heater is eliminated and replaced with multiple gas-water heat exchangers 9. The heat in the gas-water heat exchangers 9 comes from the heat tank of the heating medium. While ensuring the same feedwater temperature, the high-parameter regenerative steam originally used for the high-pressure heater can be used to generate electricity, which greatly increases the power generation.

[0031] In one feasible implementation, the outlet of the intermediate-pressure cylinder 16 is connected to the heat inlet of the low-pressure heater 11 located further downstream, and the outlet of the low-pressure cylinder 15 is connected to the heat inlet of the low-pressure heater 11 located further upstream. The heat outlet of the low-pressure heater 11 is connected to the inlet of the condenser 13. That is, the steam discharged from the low-pressure cylinder 15 and the intermediate-pressure cylinder 16 enters the low-pressure heater 11 as a heat source to exchange heat and raise the temperature of the water, and achieves successive temperature rise, effectively ensuring the temperature gradient of heat exchange in the low-pressure heater 11, thereby maximizing the heat exchange efficiency. After heat exchange, the steam condenses into water and enters the condenser 13 to achieve circulation backflow.

[0032] In one feasible implementation, the heating medium in the heating medium storage tank 8 serves as a heat source for all the steam entering the gas-water heat exchangers 9, the deaerator 10, the low-pressure heater 11, and the low-pressure cylinder 15. That is, the heating medium in the heating medium storage tank 8 can further increase the temperature of the steam entering the deaerator 10, the low-pressure heater 11, and the low-pressure cylinder 15, as a heat source. Figure 1 In the middle, the heating medium flowing out of the outlet of the heating medium storage tank 8 can act on points ①, ②, ③, ④, and ⑤.

[0033] Example 3 An integrated energy cycle method, employing the integrated energy cycle described in Examples 1-2, includes the following steps: S1: After being compressed and heated by the multi-stage compression-heat exchange system, the air enters the refrigeration expander 3 to expand and do work, driving the small generator 4 to generate electricity; then it enters the refrigeration heat exchanger 5 to exchange heat with the refrigerant, and after the temperature of the refrigerant is reduced, it is discharged into the atmosphere; the refrigerant enters the refrigerant storage tank 6 for storage. S2: Simultaneously with step S1, the heating medium in the cold storage tank 7 is heated after passing through the heating heat exchanger 2 of the multi-stage compression-heat exchange system and then enters the heating medium hot storage tank for storage. S3: The high-pressure steam generated by boiler 18 enters the steam turbine and drives the turbine's rotating shaft to rotate. At the same time, the turbine's rotating shaft drives the large generator 14 to generate electricity. S4: Steam flowing out of the low-pressure cylinder 15 of the steam turbine enters the condenser 13 to condense into liquid water. The liquid water in the condenser 13 passes through the shaft seal heater 12 and multiple low-pressure heaters 11 in sequence, then passes through the deaerator 10 and then passes through the gas-water heat exchanger 9 in sequence to exchange heat and raise the temperature. Finally, it enters the boiler 18 to complete the reflux. S5: In step S4, the heating medium in the heating medium hot storage tank provides a heat source for all gas-water heat exchangers 9, the steam entering the deaerator 10, the steam entering the low-pressure heater 11, and the steam entering the low-pressure cylinder 15. At the same time, the steam flowing out of the intermediate-pressure cylinder 16 and the low-pressure cylinder 15 in the steam turbine also provides a heat source for the low-pressure heater 11. The heating medium that has passed through the gas-water heat exchangers 9, the deaerator 10, the low-pressure heater 11, and the low-pressure cylinder 15 flows back to the heating medium cold storage tank. After passing through the low-pressure heater 11, the steam phase changes to water, and the water flows back to the condenser 13.

[0034] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A comprehensive energy cycle system, characterized in that: The system includes an energy storage system and a power generation system. The energy storage system includes a multi-stage compression-heat exchange system. The outlet of the multi-stage compression-heat exchange system is connected to the inlet of a refrigeration expander (3). The outlet of the refrigeration expander (3) is connected to the cold flow inlet of a refrigeration heat exchanger (5). The cold flow outlet of the refrigeration heat exchanger (5) is connected to the atmosphere. The hot flow inlet of the refrigeration heat exchanger (5) is used to enter the refrigerant. The hot flow outlet of the refrigeration heat exchanger (5) is connected to the refrigerant storage tank (6). There is also a heating refrigerant cold storage tank (7) connected to the cold flow inlet of the heating heat exchanger (2) in the multi-stage compression-heat exchange system. The cold outlet of the heat exchanger (2) is connected to the inlet of the heating medium storage tank (8); the power generation system includes a boiler (18) and a power generation loop. The turbine at the uppermost end of the power generation loop is connected to the steam outlet of the boiler (18), and multiple gas-water heat exchangers (9) are sequentially arranged at the lowermost end of the power generation loop. The gas-water heat exchangers (9) are sequentially connected and finally connected to the inlet of the boiler (18); the hot inlet of the gas-water heat exchanger (9) is connected to the outlet of the heating medium storage tank (8), and the hot outlet of the gas-water heat exchanger (9) is connected to the inlet of the heating medium cold storage tank (7); The multi-stage compression-heat exchange system includes multiple compressors (1) and multiple heat exchangers (2) connected sequentially and alternately. Along the direction of air flow, the upstream compressor (1) is connected to the atmosphere, the outlet of the upstream compressor (1) is connected to the heat flow inlet of the adjacent and downstream heat exchanger (2), the heat flow outlet of the heat exchanger (2) is connected to the inlet of the adjacent and downstream compressor (1), and the heat flow outlet of the downstream heat exchanger (2) is connected to the inlet of the refrigeration expander (3). The turbine in the power generation cycle includes a high-pressure cylinder (17), an intermediate-pressure cylinder (16), and a low-pressure cylinder (15). The outlet of the boiler (18) is connected to the inlet of the high-pressure cylinder (17) and the intermediate-pressure cylinder (16). The outlet of the high-pressure cylinder (17) is connected to the inlet of the boiler (18). The outlet of the intermediate-pressure cylinder (16) is connected to the inlet of the low-pressure cylinder (15). The rotating shafts of the high-pressure cylinder (17), the intermediate-pressure cylinder (16), and the low-pressure cylinder (15) are coaxial and connected to the rotating shaft of the large generator (14). The outlet of the low-pressure cylinder (15) is connected to the condenser (13), the outlet of the condenser (13) is connected to the shaft seal heater (12) via a water pump, the outlet of the shaft seal heater (12) is connected to multiple low-pressure heaters (11), the multiple low-pressure heaters (11) are connected in series, the heat flow inlet of the shaft seal heater (12) is connected to the condenser (13), and the heat flow outlet of the shaft seal heater (12) is connected to the inlet of the condenser (13); The outlet of the low-pressure heater (11) is connected to the inlet of the deaerator (10), and the outlet of the deaerator (10) is connected to the upstream gas-water heat exchanger (9). The outlet of the intermediate pressure cylinder (16) is connected to the heat flow inlet of the low pressure heater (11) located further downstream, and the outlet of the low pressure cylinder (15) is connected to the heat flow inlet of the low pressure heater (11) located further upstream; the heat flow outlet of the low pressure heater (11) is connected to the inlet of the condenser (13).

2. The integrated energy cycle system according to claim 1, characterized in that: The number of heat exchangers (2) connected in series between the heating medium hot storage tank (8) and the heating medium cold storage tank (7) is one or more, and the number of heat exchangers (2) connected in series is selected according to the temperature at which the heating medium needs to be stored in the heating medium hot storage tank (8).

3. The integrated energy cycle system according to claim 1, characterized in that: The rotating shaft of the refrigeration expander (3) is connected to the rotating shaft of the small generator (4).

4. The integrated energy cycle system according to claim 1, characterized in that: The heating medium in the heating medium storage tank (8) provides a heat source for all gas-water heat exchangers (9), steam entering the deaerator (10), steam entering the low-pressure heater (11), and steam entering the low-pressure cylinder (15).

5. A comprehensive energy cycle method, employing the comprehensive energy cycle system described in any one of claims 1-4, characterized in that: Includes the following steps: S1: After being compressed and heated by the multi-stage compression-heat exchange system, the air enters the refrigeration expander (3) to expand and do work, driving the small generator (4) to generate electricity; then it enters the refrigeration heat exchanger (5) to exchange heat with the refrigerant, and after the temperature of the refrigerant is reduced, it is discharged into the atmosphere. The refrigerant is stored in the refrigerant storage tank (6); S2: At the same time as step S1 occurs, the heating medium in the heating medium cold storage tank (7) is heated after passing through the heating heat exchanger (2) in the multi-stage compression-heat exchange system and then enters the heating medium hot storage tank (8) for storage. S3: The high-pressure steam generated by the boiler (18) enters the steam turbine and drives the turbine's rotating shaft to rotate. At the same time, the turbine's rotating shaft drives the large generator (14) to generate electricity. S4: Steam flowing out from the low-pressure cylinder (15) of the steam turbine enters the condenser (13) to condense and form liquid water. The liquid water in the condenser (13) passes through the shaft seal heater (12) and multiple low-pressure heaters (11) in sequence, then passes through the deaerator (10) and then passes through the gas-water heat exchanger (9) in sequence to exchange heat and raise the temperature, and then enters the boiler (18). S5: In step S4, the heating medium in the heating medium hot storage tank (8) provides a heat source for all gas-water heat exchangers (9), steam entering the deaerator (10), steam entering the low-pressure heater (11), and steam entering the low-pressure cylinder (15). At the same time, the steam flowing out of the intermediate-pressure cylinder (16) and low-pressure cylinder (15) in the steam turbine also provides a heat source for the low-pressure heater (11). The heating medium that has passed through the gas-water heat exchanger (9), deaerator (10), low-pressure heater (11), and low-pressure cylinder (15) flows back to the heating medium cold storage tank (7).

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