Heating and air-conditioning cold and heat source integrated system of secondary circulation cooling power plant and operation method

Abstract

The invention belongs to the technical field of heating air conditioners, and particularly relates to a heating air conditioner cold and heat source integrated system of a secondary circulation cooling power plant and an operation method. In the system, a lithium bromide absorption type heat pump unit adopts steam extraction of a steam turbine generator unit to drive heat exchange, and the lithium bromide absorption type heat pump unit and a condenser form a power plant circulating water heat exchange loop; the lithium bromide absorption type heat pump unit and the heating air conditioner user unit form a heating return water heating loop to heat the heating return water; the lithium bromide absorption type heat pump unit adopts steam extraction of a steam turbine generator unit to drive heat exchange, the lithium bromide absorption type heat pump unit and the heating air conditioner user unit form an air conditioner cold water return cooling loop to reduce the temperature of air conditioner cold water return, and the lithium bromide absorption type heat pump unit and the cooling tower form a cooling water loop to reduce the temperature of the air conditioner cold water return. And heat of cooling water of the lithium bromide absorption heat pump unit is taken away. The device can effectively reduce the types and number of devices, improve the utilization rate of the devices and recover waste heat.

Description

Technical Field

[0001] This invention belongs to the field of heating and air conditioning technology, specifically relating to an integrated cold and heat source system for a secondary circulation cooling power plant and its operation method. Background Technology

[0002] Power plants utilize high-temperature, high-pressure steam generated by boilers (thermal power plants) or reactor-steam generators (nuclear power plants) to drive turbine generator sets to generate electricity. The exhaust steam, after performing its work, enters a condenser to condense into water, then returns to the boiler or steam generator for heat exchange before entering the turbine generator set again, in a continuous cycle. Exhaust steam cooling is divided into direct-flow cooling and secondary-cycle cooling. With the development of near-shore power plant sites reaching saturation, direct-flow cooling power plants are decreasing. Secondary-cycle cooling with cooling towers uses less water, offers greater site flexibility, and is more suitable for future development trends.

[0003] The condensation of exhaust steam requires a large amount of cooling water. This cooling water contains a lot of heat energy, and its temperature and quality are low, making it difficult to use directly. It is generally discharged directly into the environment, causing thermal pollution.

[0004] Power plant heating and air conditioning systems typically have separate chilled water and hot water systems, using a "chiller + boiler" model. These two systems are set up separately, occupy a large amount of plant space, have many types of equipment, a large number of units, low equipment utilization, and consume a lot of steam and plant electricity. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated heating and air conditioning system and operating method for a secondary circulation cooling power plant. Based on the performance of lithium bromide absorption heat pumps, which can both heat and cool, the invention utilizes the low-temperature waste heat and cooling equipment of the secondary circulation cooling power plant, and replaces the traditional chiller and heating heat exchanger with a lithium bromide heat pump unit to achieve integrated heating and air conditioning system. This effectively reduces the types and number of equipment, improves equipment utilization, and recovers waste heat.

[0006] Technical solution to achieve the purpose of this invention: This invention provides an integrated heating and air conditioning system for a power plant with a secondary circulation cooling system, comprising: a steam turbine generator set, a cooling tower, a condenser, and a lithium bromide absorption heat pump unit; the steam turbine generator set is connected to the condenser, and the cooling tower and condenser form a secondary circulating water cooling loop, wherein the secondary circulating water cools the exhaust steam of the steam turbine generator set, and the cooling tower cools the secondary circulating water after it has been heated from the condenser; the lithium bromide absorption heat pump unit uses the extracted steam from the steam turbine generator set to drive heat exchange, and the lithium bromide absorption heat pump unit and the condenser... The steam turbine forms a heat exchange loop for the power plant's circulating water, generating waste heat from the circulating water. The lithium bromide absorption heat pump unit forms a heating loop for the heating and air conditioning user units, heating the heating return water. The lithium bromide absorption heat pump unit uses steam extraction from the steam turbine generator unit to drive heat exchange. The lithium bromide absorption heat pump unit forms a cooling loop for the air conditioning chilled water return water with the heating and air conditioning user units, reducing the temperature of the air conditioning chilled water return water. The lithium bromide absorption heat pump unit forms a cooling water loop with the cooling tower, removing the heat from the cooling water of the lithium bromide absorption heat pump unit.

[0007] Furthermore, the steam turbine generator set is connected to the condenser via the exhaust steam pipeline, and the condenser is connected to the cooling tower via the secondary circulating water return pipeline and the secondary circulating water supply pipeline to form a secondary circulating water cooling circuit, which is used to cool the exhaust steam of the steam turbine generator set and cool the secondary circulating water.

[0008] Furthermore, the steam turbine generator set is connected to the generator of the lithium bromide absorption heat pump unit via an extraction steam pipeline. The generator of the lithium bromide absorption heat pump unit is connected to the condenser via a steam condensate pipeline, which is used to drive heat exchange through the extraction steam of the steam turbine generator set, converting the extraction steam of the steam turbine generator set into steam condensate. The condenser is connected to the evaporator of the lithium bromide absorption heat pump unit via a waste hot water supply pipeline and a waste hot water return pipeline, forming a heat exchange loop for the power plant circulating water, generating waste heat from the circulating water. The heating and air conditioning user unit is connected to the absorber and condenser of the lithium bromide absorption heat pump unit via a heating return water pipeline and a heating supply water pipeline, forming a heating return water heating loop for heating the heating return water.

[0009] Furthermore, the steam turbine generator set is connected to the generator of the lithium bromide absorption heat pump unit via an extraction steam pipeline. The generator of the lithium bromide absorption heat pump unit is connected to the condenser via a steam condensate pipeline, which is used to drive heat exchange through the extraction steam of the steam turbine generator set, converting the extraction steam of the steam turbine generator set into steam condensate. The heating and air conditioning user unit is connected to the evaporator of the lithium bromide absorption heat pump unit via an air conditioning chilled water return pipeline and an air conditioning chilled water supply pipeline, forming an air conditioning chilled water return cooling loop, which is used for air conditioning chilled water return heat exchange and cooling. The absorber and condenser of the lithium bromide absorption heat pump unit are connected to the cooling tower via a cooling water return pipeline and a cooling water supply pipeline, forming a cooling water loop, which is used to remove the heat from the cooling water of the absorber and condenser of the lithium bromide absorption heat pump unit.

[0010] Furthermore, a heating water circulation pump is installed on the heating return water pipeline, and the heating return water is pressurized by the heating water circulation pump and enters the absorber and condenser of the lithium bromide absorption heat pump unit through the heating return water pipeline; an air conditioning chilled water circulation pump is installed on the air conditioning chilled water return water pipeline, and the air conditioning chilled water is pressurized by the air conditioning chilled water circulation pump and enters the evaporator of the lithium bromide absorption heat pump unit through the air conditioning chilled water return water pipeline; a waste hot water circulation pump is installed on the waste hot water supply pipeline, and the power plant circulating water, after being heated by the condenser, is pressurized by the waste hot water supply pipeline and enters the evaporator of the lithium bromide absorption heat pump unit through the waste hot water circulation pump; a cooling water pump is installed on the cooling water supply pipeline, and the cooling water is pressurized by the cooling water pump and enters the absorber and condenser of the lithium bromide absorption heat pump unit through the cooling water supply pipeline.

[0011] Furthermore, a steam valve is installed on the extraction steam pipeline, a second waste hot water valve is installed on the waste hot water supply pipeline, a first waste hot water valve is installed on the waste hot water return pipeline, a second heating water valve is installed on the heating return pipeline, a first heating water valve is installed on the heating supply pipeline, a second air conditioning cold water valve is installed on the air conditioning cold water return pipeline, a first air conditioning cold water valve is installed on the air conditioning cold water supply pipeline, a second cooling water valve is installed on the cooling water return pipeline, and a first cooling water valve is installed on the cooling water supply pipeline.

[0012] This invention also provides a method for integrated operation of heating and air conditioning cold and heat sources in a secondary circulation cooling power plant, comprising: Step 1: Under winter heating conditions, the lithium bromide absorption heat pump unit uses the extraction steam of the steam turbine generator set to drive the heat exchange. The lithium bromide absorption heat pump unit and the condenser form a power plant circulating water heat exchange loop to generate waste heat of the circulating water. The lithium bromide absorption heat pump unit and the heating and air conditioning user unit form a heating return water heating loop to heat the heating return water. Step 2: Under summer cooling conditions, the lithium bromide absorption heat pump unit uses steam extraction from the turbine generator set to drive heat exchange. The lithium bromide absorption heat pump unit and the heating and air conditioning user unit form an air conditioning chilled water return cooling circuit to reduce the air conditioning chilled water return temperature. The lithium bromide absorption heat pump unit and the cooling tower form a cooling water circuit to remove the heat inside the lithium bromide absorption heat pump unit.

[0013] Further, step 1 specifically involves: closing the first air conditioning chilled water valve, the second air conditioning chilled water valve, the first cooling water valve, and the second cooling water valve; and opening the steam valve, the first waste hot water valve, the second waste hot water valve, the first heating water valve, and the second heating water valve. The extracted steam from the turbine generator unit serves as the driving heat source, entering the generator of the lithium bromide absorption heat pump unit via the extraction steam pipeline. After heat exchange, the steam condensate returns to the condenser via the steam condensate pipeline. The power plant circulating water flows through the condenser, is heated, and then, via the waste hot water supply pipeline, is pressurized by the waste hot water circulation pump and sent to the evaporator of the lithium bromide absorption heat pump unit for heat exchange. After heat exchange, it returns to the condenser via the waste hot water return pipeline, reducing the circulating water temperature. The heating and air conditioning user units send heating return water through the heating return water pipeline, which is pressurized by the heating water circulation pump and sent to the absorber and condenser of the lithium bromide absorption heat pump unit, where it is heated. The water is then sent to the heating and air conditioning user units via the heating supply water pipeline.

[0014] Further, step 2 specifically involves: closing the first waste hot water valve, the second waste hot water valve, the first heating water valve, and the second heating water valve; and opening the steam valve, the first air conditioning chilled water valve, the second air conditioning chilled water valve, the first cooling water valve, and the second cooling water valve. The extracted steam from the turbine generator unit serves as the driving heat source and enters the generator of the lithium bromide absorption heat pump unit via the extraction steam pipeline. After heat exchange, the steam condensate returns to the condenser via the steam condensate pipeline. The air conditioning chilled water return from the heating and air conditioning user units is then... After being pressurized by the air conditioning chilled water circulation pump, the chilled water return pipe enters the evaporator of the lithium bromide absorption heat pump unit for heat exchange and cooling. Then, it is sent back to the heating and air conditioning user unit through the air conditioning chilled water supply pipe. The heat from the absorber and condenser of the lithium bromide absorption heat pump unit is carried away through the cooling water circuit. The cooling water from the absorber and condenser of the lithium bromide absorption heat pump unit enters the cooling tower through the cooling water return pipe for cooling. Then, it is sent back to the absorber and condenser of the lithium bromide absorption heat pump unit through the cooling water supply pipe and the cooling water pump.

[0015] The beneficial technical effects of this invention are as follows: This invention connects a steam turbine generator set, a lithium bromide absorption heat pump unit, a cooling tower, a condenser, and related pipelines. Valves are installed on these pipelines, and by controlling the switching of these valves, the system can recover waste heat from secondary circulating water to produce heating hot water in winter and use the cooling tower as a cooling device for refrigeration in summer. This achieves dual functionality, reducing the types and number of equipment compared to traditional heating and air conditioning heat sources, improving equipment utilization, and enabling waste heat recovery.

[0016] This invention utilizes the low-temperature waste heat of the secondary circulation cooling system and the cooling tower equipment, which can reduce the footprint and the types and quantities of HVAC heat source equipment, improve equipment utilization, reduce the consumption of steam for heating and electricity for cooling in power plants, and reduce the temperature of secondary circulating water by recovering waste heat, thereby reducing the thermal impact on the environment and making it more beneficial to the operation of power plants. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an integrated cold and heat source system for a secondary circulation cooling power plant heating and air conditioning system provided by the present invention.

[0018] In the diagram: 1. Steam turbine generator set; 2. Cooling tower; 3. Condenser; 4. Lithium bromide absorption heat pump unit; 5. Heating and air conditioning user unit; 6. Heating water circulation pump; 7. Air conditioning chilled water circulation pump; 8. Waste hot water circulation pump; 9. Cooling water pump; 10. First waste hot water valve; 11. Second waste hot water valve; 12. First air conditioning chilled water valve; 13. Second air conditioning chilled water valve; 14. First heating water valve; 15. Second heating water valve; 16. First cooling water valve ; 17. Second cooling water valve; 18. Steam valve; 19. Steam extraction pipeline; 20. Steam condensate pipeline; 21. Waste hot water supply pipeline; 22. Waste hot water return pipeline; 23. Heating return pipeline; 24. Heating supply pipeline; 25. Air conditioning chilled water return pipeline; 26. Air conditioning chilled water supply pipeline; 27. Cooling water return pipeline; 28. Cooling water supply pipeline; 29. ​​Exhaust steam pipeline; 30. Secondary circulating water return pipeline; 31. Secondary circulating water supply pipeline. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] A lithium bromide absorption heat pump unit is a water-based chiller that uses water as the refrigerant (water evaporates at 4°C under vacuum) and lithium bromide solution as the absorbent. It follows the second law of thermodynamics and employs a reverse Carnot cycle: a small amount of steam enters the generator as the driving force, absorbing waste heat from low-grade heat sources (in the evaporator) to generate a large amount of high-grade heat energy (in the absorber and condenser). Cooling and heating are achieved by setting different evaporation / condensation temperatures in winter and summer.

[0021] like Figure 1 As shown, the present invention provides an integrated heating and air conditioning system for a secondary circulation cooling power plant, comprising: a steam turbine generator set 1, a cooling tower 2, a condenser 3, and a lithium bromide absorption heat pump unit 4.

[0022] The steam turbine generator set 1 is connected to the condenser 3, and the cooling tower 2 forms a secondary circulating water cooling circuit with the condenser 3. The secondary circulating water cools the exhaust steam of the steam turbine generator set 1, and the cooling tower 2 cools the secondary circulating water after it has been heated from the condenser 3.

[0023] The lithium bromide absorption heat pump unit 4 uses the steam extraction of the turbine generator unit 1 to drive the heat exchange. The lithium bromide absorption heat pump unit 4 and the condenser 3 form a power plant circulating water heat exchange loop to generate waste heat of the circulating water. The lithium bromide absorption heat pump unit 4 and the heating and air conditioning user unit 5 form a heating return water heating loop to heat the heating return water.

[0024] The lithium bromide absorption heat pump unit 4 uses the steam extraction of the turbine generator unit 1 to drive the heat exchange. The lithium bromide absorption heat pump unit 4 and the heating and air conditioning user unit 5 form an air conditioning chilled water return cooling circuit to reduce the air conditioning chilled water return temperature. The lithium bromide absorption heat pump unit 4 and the cooling tower 2 form a cooling water circuit to remove the heat from the cooling water of the lithium bromide absorption heat pump unit 4.

[0025] The turbine generator set 1 is connected to the condenser 3 via the exhaust steam pipeline 29. The condenser 3 is connected to the cooling tower 2 via the secondary circulating water return pipeline 30 and the secondary circulating water supply pipeline 31. After the power plant steam enters the turbine generator set 1 to generate electricity, the exhaust steam enters the condenser 3 via the exhaust steam pipeline 29 for condensation. The secondary circulating water is heated from the condenser 3 and then enters the cooling tower 2 via the secondary circulating water return pipeline 30 to cool down. It then returns to the condenser 3 via the secondary circulating water supply pipeline 31, forming a secondary circulating water cooling circuit, which is used to cool the exhaust steam of the turbine generator set 1 and cool the secondary circulating water.

[0026] During winter heating operation, when heating the heating return water, the connections between the steam turbine generator set 1, condenser 3, lithium bromide absorption heat pump unit 4, heating and air conditioning user unit 5, and related pipelines are as follows: The steam turbine generator set 1 is connected to the generator of the lithium bromide absorption heat pump unit 4 through the extraction steam pipeline 19. The generator of the lithium bromide absorption heat pump unit 4 is connected to the condenser 3 through the steam condensate pipeline 20. This allows the extracted steam from the steam turbine generator set 1 to return to the condenser 3 through the extraction steam pipeline 19, the generator of the lithium bromide absorption heat pump unit 4, and the steam condensate pipeline 20. This steam is used to drive the heat exchange of the extracted steam from the steam turbine generator set 1, converting the extracted steam from the steam turbine generator set 1 into steam condensate. Condenser 3 is connected to the evaporator of lithium bromide absorption heat pump unit 4 through waste hot water supply pipeline 21 and waste hot water return pipeline 22, so that the power plant circulating water returns to condenser 3 through condenser 3, waste hot water supply pipeline 21, evaporator of lithium bromide absorption heat pump unit 4 and waste hot water return pipeline 22, forming a heat exchange loop for power plant circulating water, which is used for heat exchange of power plant circulating water and generates waste heat of circulating water; The heating and air conditioning user unit 5 is connected to the absorber and condenser of the lithium bromide absorption heat pump unit 4 through the heating return water pipe 23 and the heating supply water pipe 24; so that the heating return water returns to the heating and air conditioning user unit 5 through the heating and air conditioning user unit 5, the heating return water pipe 23, the absorber and condenser of the lithium bromide absorption heat pump unit 4, and the heating supply water pipe 24, forming a heating return water heating loop for heating the heating return water.

[0027] Under summer cooling conditions, when lowering the chilled water return temperature of the air conditioner, the connections between the turbine generator set 1, cooling tower 2, condenser 3, lithium bromide absorption heat pump unit 4, heating and air conditioning user unit 5, and related pipelines are as follows: The steam turbine generator set 1 is connected to the generator of the lithium bromide absorption heat pump unit 4 through the extraction steam pipeline 19. The generator of the lithium bromide absorption heat pump unit 4 is connected to the condenser 3 through the steam condensate pipeline 20. This allows the extracted steam from the steam turbine generator set 1 to return to the condenser 3 through the extraction steam pipeline 19, the generator of the lithium bromide absorption heat pump unit 4, and the steam condensate pipeline 20. This steam is used to drive the heat exchange of the extracted steam from the steam turbine generator set 1, converting the extracted steam from the steam turbine generator set 1 into steam condensate. The heating and air conditioning user unit 5 is connected to the evaporator of the lithium bromide absorption heat pump unit 4 through the air conditioning chilled water return pipe 25 and the air conditioning chilled water supply pipe 26. This allows the air conditioning chilled water return to return to the heating and air conditioning user unit 5 through the heating and air conditioning user unit 5, the air conditioning chilled water return pipe 25, the evaporator of the lithium bromide absorption heat pump unit 4, and the air conditioning chilled water supply pipe 26, forming an air conditioning chilled water return cooling loop for heat exchange and cooling of the air conditioning chilled water return. The absorber and condenser of the lithium bromide absorption heat pump unit 4 are connected to the cooling tower 2 through the cooling water return pipe 27 and the cooling water supply pipe 28. This allows the cooling water from the absorber and condenser of the lithium bromide absorption heat pump unit 4 to return to the absorber and condenser of the lithium bromide absorption heat pump unit 4 after being cooled by the cooling water return pipe 27, the cooling tower 2, and the cooling water supply pipe 28, forming a cooling water loop to remove the heat from the absorber and condenser of the lithium bromide absorption heat pump unit 4.

[0028] In one specific embodiment, a heating water circulation pump 6 is installed on the heating return water pipeline 23. The heating return water is pressurized by the heating water circulation pump 6 through the heating return water pipeline 23 and enters the absorber and condenser of the lithium bromide absorption heat pump unit 4.

[0029] An air conditioning chilled water circulation pump 7 is installed on the air conditioning chilled water return pipe 25. The air conditioning chilled water return water is pressurized by the air conditioning chilled water circulation pump 7 through the air conditioning chilled water return pipe 25 and enters the evaporator of the lithium bromide absorption heat pump unit 4.

[0030] A waste hot water circulation pump 8 is installed on the waste hot water supply pipeline 21. After the power plant's circulating water is heated by the condenser 3, it is pressurized by the waste hot water supply pipeline 21 and the waste hot water circulation pump 8 before entering the evaporator of the lithium bromide absorption heat pump unit 4.

[0031] A cooling water pump 9 is installed on the cooling water supply pipeline 28. The cooling water is pressurized by the cooling water pump 9 through the cooling water supply pipeline 28 and enters the absorber and condenser of the lithium bromide absorption heat pump unit 4.

[0032] A steam valve 18 is installed on the steam extraction pipeline 19; a second waste hot water valve 11 is installed on the waste hot water supply pipeline 21; a first waste hot water valve 10 is installed on the waste hot water return pipeline 22; a second heating water valve 15 is installed on the heating return pipeline 23; a first heating water valve 14 is installed on the heating supply pipeline 24; a second air conditioning cold water valve 13 is installed on the air conditioning cold water return pipeline 25; a first air conditioning cold water valve 12 is installed on the air conditioning cold water supply pipeline 26; a second cooling water valve 17 is installed on the cooling water return pipeline 27; and a first cooling water valve 16 is installed on the cooling water supply pipeline 28.

[0033] This invention also provides an integrated operation method for the heating and air conditioning cold and heat source of a secondary circulation cooling power plant, which adopts the above-mentioned integrated heating and air conditioning cold and heat source system for a secondary circulation cooling power plant, specifically including the following steps: Step 1: Under winter heating conditions, the lithium bromide absorption heat pump unit 4 uses the steam extraction of the turbine generator unit 1 to drive heat exchange. The lithium bromide absorption heat pump unit 4 and the condenser 3 form a power plant circulating water heat exchange loop to generate waste heat of the circulating water. The lithium bromide absorption heat pump unit 4 and the heating and air conditioning user unit 5 form a heating return water heating loop to heat the heating return water. Close the first air conditioning chilled water valve 12, the second air conditioning chilled water valve 13, the first cooling water valve 16, and the second cooling water valve 17, and open the steam valve 18, the first residual hot water valve 10, the second residual hot water valve 11, the first heating water valve 14, and the second heating water valve 15.

[0034] Steam extracted from turbine generator unit 1 serves as the driving heat source, entering the generator of lithium bromide absorption heat pump unit 4 via extraction steam pipeline 19. After heat exchange, the steam condensate returns to condenser 3 via steam condensate pipeline 20. Power plant circulating water flows through condenser 3, is heated, and then pressurized by waste hot water supply pipeline 21 and waste hot water circulation pump 8 before being sent to the evaporator of lithium bromide absorption heat pump unit 4 for heat exchange. After heat exchange, it returns to condenser 3 via waste hot water return pipeline 22, reducing the circulating water temperature. Heating and air conditioning user unit 5 sends out 45°C heating return water via heating return water pipeline 23, which is pressurized by heating water circulation pump 6 and sent to the absorber and condenser of lithium bromide absorption heat pump unit 4, where it is heated to 70°C. Then, it is sent to heating and air conditioning user unit 5 via heating water supply pipeline 24.

[0035] Step 2: Under summer cooling conditions, the lithium bromide absorption heat pump unit 4 uses the steam extraction of the turbine generator unit 1 to drive heat exchange. The lithium bromide absorption heat pump unit 4 and the heating and air conditioning user unit 5 form an air conditioning chilled water return cooling circuit to reduce the air conditioning chilled water return temperature. The lithium bromide absorption heat pump unit 4 and the cooling tower 2 form a cooling water circuit to remove the heat inside the lithium bromide absorption heat pump unit 4.

[0036] Close the first residual hot water valve 10, the second residual hot water valve 11, the first heating water valve 14, and the second heating water valve 15; open the steam valve 18, the first air conditioning cold water valve 12, the second air conditioning cold water valve 13, the first cooling water valve 16, and the second cooling water valve 17.

[0037] Steam extracted from turbine generator set 1 serves as the driving heat source and enters the generator of lithium bromide absorption heat pump unit 4 via extraction steam pipeline 19. After heat exchange, the steam condensate returns to condenser 3 via steam condensate pipeline 20. The 12°C chilled water return from heating and air conditioning user unit 5 is pressurized by air conditioning chilled water circulation pump 7 via air conditioning chilled water return pipeline 25 and enters the evaporator of lithium bromide absorption heat pump unit 4 for heat exchange and cooling to 7°C. Then, it is sent back to heating and air conditioning user unit 5 via air conditioning chilled water supply pipeline 26. The heat from the absorber and condenser of lithium bromide absorption heat pump unit 4 is carried away through the cooling water circuit. The cooling water from the absorber and condenser of lithium bromide absorption heat pump unit 4 enters the cooling tower 2 via cooling water return pipeline 27 for cooling and is then sent back to the absorber and condenser of lithium bromide absorption heat pump unit 4 via cooling water pump 9 via cooling water supply pipeline 28.

[0038] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A dual-cycle cooling power plant heating and air conditioning integrated cold and heat source system, characterized in that, include: The turbine generator set (1), cooling tower (2), condenser (3), and lithium bromide absorption heat pump unit (4) are connected. The turbine generator set (1) is connected to the condenser (3), and the cooling tower (2) and the condenser (3) form a secondary circulating water cooling loop. The secondary circulating water cools the exhaust steam of the turbine generator set (1), and the cooling tower (2) cools the secondary circulating water after it has been heated from the condenser (3). The lithium bromide absorption heat pump unit (4) uses the extracted steam of the turbine generator set (1) to drive heat exchange. The lithium bromide absorption heat pump unit (4) and the condenser (3) form a power plant circulation loop. The circulating water heat exchange loop generates waste heat from the circulating water. The lithium bromide absorption heat pump unit (4) and the heating and air conditioning user unit (5) form a heating return water heating loop to heat the heating return water. The lithium bromide absorption heat pump unit (4) uses the extraction steam of the steam turbine generator unit (1) to drive the heat exchange. The lithium bromide absorption heat pump unit (4) and the heating and air conditioning user unit (5) form an air conditioning cold water return water cooling loop to reduce the air conditioning cold water return water temperature. The lithium bromide absorption heat pump unit (4) and the cooling tower (2) form a cooling water loop to remove the heat from the cooling water of the lithium bromide absorption heat pump unit (4).

2. The integrated cold and heat source system for secondary circulation cooling power plant heating and air conditioning according to claim 1, characterized in that, The turbine generator set (1) is connected to the condenser (3) through the exhaust steam pipeline (29). The condenser (3) is connected to the cooling tower (2) through the secondary circulating water return pipeline (30) and the secondary circulating water supply pipeline (31) to form a secondary circulating water cooling circuit, which is used to cool the exhaust steam of the turbine generator set (1) and cool the secondary circulating water.

3. The integrated cold and heat source system for secondary circulation cooling power plant heating and air conditioning according to claim 1, characterized in that, The steam turbine generator set (1) is connected to the generator of the lithium bromide absorption heat pump unit (4) through the extraction steam pipeline (19). The generator of the lithium bromide absorption heat pump unit (4) is connected to the condenser (3) through the steam condensate pipeline (20) for the extraction steam of the steam turbine generator set (1) to drive heat exchange and convert the extraction steam of the steam turbine generator set (1) into steam condensate. The condenser (3) is connected to the evaporator of the lithium bromide absorption heat pump unit (4) through the waste hot water supply pipeline (21) and the waste hot water return pipeline (22) to form a power plant circulating water heat exchange loop for power plant circulating water heat exchange and generate circulating water waste heat. The heating and air conditioning user unit (5) is connected to the absorber and condenser of the lithium bromide absorption heat pump unit (4) through the heating return water pipeline (23) and the heating supply water pipeline (24) to form a heating return water heating loop for heating the heating return water.

4. The integrated cold and heat source system for secondary circulation cooling power plant heating and air conditioning according to claim 1, characterized in that, The steam turbine generator set (1) is connected to the generator of the lithium bromide absorption heat pump unit (4) through the extraction steam pipeline (19). The generator of the lithium bromide absorption heat pump unit (4) is connected to the condenser (3) through the steam condensate pipeline (20) for the extraction steam of the steam turbine generator set (1) to drive heat exchange and convert the extraction steam of the steam turbine generator set (1) into steam condensate. The heating and air conditioning user unit (5) is connected to the air conditioning chilled water return pipeline (25) and the air conditioning chilled water return pipeline (25). The water supply pipeline (26) is connected to the evaporator of the lithium bromide absorption heat pump unit (4) to form an air conditioning chilled water return cooling circuit for air conditioning chilled water return heat exchange and cooling; the absorber and condenser of the lithium bromide absorption heat pump unit (4) are connected to the cooling tower (2) through the cooling water return pipeline (27) and the cooling water supply pipeline (28) to form a cooling water circuit for carrying away the heat of the cooling water of the absorber and condenser of the lithium bromide absorption heat pump unit (4).

5. A secondary circulation cooling power plant heating and air conditioning integrated cold and heat source system according to any one of claims 3 or 4, characterized in that, A heating water circulation pump (6) is installed on the heating return water pipeline (23). The heating return water is pressurized through the heating return water pipeline (23) and the heating water circulation pump (6) and enters the absorber and condenser of the lithium bromide absorption heat pump unit (4). An air conditioning cold water circulation pump (7) is installed on the air conditioning cold water return water pipeline (25). The air conditioning cold water return water is pressurized through the air conditioning cold water return water pipeline (25) and the air conditioning cold water circulation pump (7) and enters the evaporator of the lithium bromide absorption heat pump unit (4). A waste hot water circulation pump (8) is installed on the waste hot water supply pipeline (21). After the power plant circulating water is heated by the condenser (3), it is pressurized by the waste hot water supply pipeline (21) and the waste hot water circulation pump (8) and enters the evaporator of the lithium bromide absorption heat pump unit (4). A cooling water pump (9) is installed on the cooling water supply pipeline (28). The cooling water is pressurized by the cooling water supply pipeline (28) and the cooling water pump (9) and enters the absorber and condenser of the lithium bromide absorption heat pump unit (4).

6. The integrated cold and heat source system for secondary circulation cooling power plant heating and air conditioning according to claim 5, characterized in that, A steam valve (18) is installed on the steam extraction pipeline (19), a second waste hot water valve (11) is installed on the waste hot water supply pipeline (21), a first waste hot water valve (10) is installed on the waste hot water return pipeline (22), a second heating water valve (15) is installed on the heating return pipeline (23), a first heating water valve (14) is installed on the heating supply pipeline (24), a second air conditioning cold water valve (13) is installed on the air conditioning cold water return pipeline (25), a first air conditioning cold water valve (12) is installed on the air conditioning cold water supply pipeline (26), a second cooling water valve (17) is installed on the cooling water return pipeline (27), and a first cooling water valve (16) is installed on the cooling water supply pipeline (28).

7. A method for integrated operation of heating and air conditioning cold and heat source in a secondary circulation cooling power plant, employing the integrated heating and air conditioning cold and heat source system for a secondary circulation cooling power plant as described in claim 6, characterized in that... include: Step 1: Under winter heating conditions, the lithium bromide absorption heat pump unit (4) uses the steam extraction of the turbine generator unit (1) to drive heat exchange. The lithium bromide absorption heat pump unit (4) and the condenser (3) form a power plant circulating water heat exchange loop to generate waste heat of the circulating water. The lithium bromide absorption heat pump unit (4) and the heating and air conditioning user unit (5) form a heating return water heating loop to heat the heating return water. Step 2: Under summer cooling conditions, the lithium bromide absorption heat pump unit (4) uses the steam extraction of the steam turbine generator set (1) to drive heat exchange. The lithium bromide absorption heat pump unit (4) and the heating and air conditioning user unit (5) form an air conditioning chilled water return cooling circuit to reduce the air conditioning chilled water return temperature. The lithium bromide absorption heat pump unit (4) and the cooling tower (2) form a cooling water circuit to remove the heat inside the lithium bromide absorption heat pump unit (4).

8. The integrated operation method of heating and air conditioning cold and heat source in a secondary circulation cooling power plant according to claim 7, characterized in that, Step 1 specifically involves: closing the first air conditioning chilled water valve (12), the second air conditioning chilled water valve (13), the first cooling water valve (16), and the second cooling water valve (17); and opening the steam valve (18), the first waste hot water valve (10), the second waste hot water valve (11), the first heating water valve (14), and the second heating water valve (15); the extracted steam from the turbine generator set (1) is used as a driving heat source and enters the generator of the lithium bromide absorption heat pump unit (4) through the extraction steam pipeline (19); after heat exchange, the steam condensate returns to the condensate through the steam condensate pipeline (20). Steam generator (3); The circulating water of the power plant flows through the condenser (3) and is heated. It is then pressurized by the waste hot water supply pipeline (21) and sent to the evaporator of the lithium bromide absorption heat pump unit (4) for heat exchange. After heat exchange, it returns to the condenser (3) through the waste hot water return pipeline (22) to reduce the temperature of the circulating water. The heating and air conditioning user unit (5) sends out the heating return water through the heating return water pipeline (23). After being pressurized by the heating water circulation pump (6), it is sent to the absorber and condenser of the lithium bromide absorption heat pump unit (4) and heated. Then it is sent to the heating and air conditioning user unit (5) through the heating water supply pipeline (24).

9. The integrated operation method of heating and air conditioning cold and heat source in a secondary circulation cooling power plant according to claim 7, characterized in that, Step 2 specifically involves: closing the first waste hot water valve (10), the second waste hot water valve (11), the first heating water valve (14), and the second heating water valve (15); and opening the steam valve (18), the first air conditioning chilled water valve (12), the second air conditioning chilled water valve (13), the first cooling water valve (16), and the second cooling water valve (17); the extracted steam from the turbine generator set (1) is used as a driving heat source and enters the generator of the lithium bromide absorption heat pump unit (4) through the extraction steam pipeline (19); after heat exchange, the steam condensate returns to the condenser (3) through the steam condensate pipeline (20); and the air conditioning chilled water of the heating and air conditioning user unit (5) is used as a driving heat source. The return water, after being pressurized by the air conditioning chilled water circulation pump (7) through the air conditioning chilled water return pipeline (25), enters the evaporator of the lithium bromide absorption heat pump unit (4) for heat exchange and cooling, and is then sent back to the heating and air conditioning user unit (5) through the air conditioning chilled water supply pipeline (26). The heat of the absorber and condenser of the lithium bromide absorption heat pump unit (4) is carried away through the cooling water circuit. The cooling water of the absorber and condenser of the lithium bromide absorption heat pump unit (4) enters the cooling tower (2) through the cooling water return pipeline (27) for cooling, and is then sent back to the absorber and condenser of the lithium bromide absorption heat pump unit (4) through the cooling water pump (9) through the cooling water supply pipeline (28).

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