System and method for supplying cascade energy using waste heat from power plant during production

Abstract

The present application relates to a system and method for supplying cascade energy using waste heat from a power plant during production. The waste heat from the power plant during production is connected to a heat source inlet of a lithium-bromide absorption chiller and to a waste water inlet of a waste water heat exchanger, and a heat source outlet of the lithium-bromide absorption chiller is connected to the waster water inlet of the waste water heat exchanger and to a water return port of the waste heat from the power plant during production; the lithium-bromide absorption chiller is connected to a chilled water intake line, a chilled water output line, a cooled water intake line and a cooled water discharge line, the cooled water discharge line is connected to a clean water side inlet of the waste water heat exchanger, and a clean water side outlet of the waste water heat exchanger is sequentially connected to a water purification device and a hot water tank; the clean water side inlet of the waste water heat exchanger is connected to a heating water return line, and the clean water side outlet of the waste water heat exchanger is connected to a heating water supply line; and a water outlet of the waste heat from the power plant during production is further connected to a heat source inlet of a solution regenerator, and a waste water outlet of the solution regenerator is connected to the water return port of the waste heat from the power plant during production. The system of the present application has high energy utilization efficiency, thus effectively expanding the range of waste-water waste heat utilization.

Description

A system and method for supplying cascade energy using waste heat from power plant production processes

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to a Chinese patent application filed with the Patent Office of China on February 5, 2024, with application number 202410165291.3 and invention name “A system and method for supplying cascade energy using waste heat from power plant production processes,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the field of waste heat utilization technology, and relates to a system and method for supplying cascade energy by utilizing waste heat from the production process of a power plant. Background Art

[0004] Power plants generate significant amounts of waste heat during their production processes, some reaching temperatures around 90°C. This waste heat is typically discharged directly or used to produce medium- and low-temperature hot water. While this approach is simple, its application is limited. Power plants are large and typically include considerable auxiliary production rooms, which require cooling in the summer and heating in the winter. Using electric air conditioning increases the plant's operating costs. Hot water-type lithium bromide units can produce high-temperature chilled water using a 90°C heat source. Combined with a dehumidifier, this can meet the summer air conditioning needs of office buildings. The hygroscopic solution in dehumidifiers loses its dehumidifying capacity after a certain level of operation and requires regeneration for continued use. This regeneration process consumes a considerable amount of heat. Currently, there is no system that fully and systematically utilizes waste heat from power plant production processes to provide hot water, heating, air conditioning, and solution regeneration.

[0005] Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the present application provides a system and method for supplying cascade energy by utilizing waste heat from the production process of a power plant, which can effectively utilize industrial waste heat to supply domestic hot water, and can also utilize waste heat for air conditioning, heating and regeneration of working fluids, thereby improving the economic benefits of the waste heat utilization system.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted in this application is: a system for supplying cascade energy by utilizing waste heat from the production process of a power plant, comprising waste heat from the production process of the power plant, a bromide chiller, a wastewater heat exchanger, a water purification device, a hot water tank, a solution regenerator, a liquid storage tank and a dehumidification device; the waste heat from the production process of the power plant is connected to the heat source inlet of the bromide chiller and the sewage inlet of the wastewater heat exchanger, and the heat source outlet of the bromide chiller is respectively connected to the sewage inlet of the wastewater heat exchanger and the waste heat return port of the production process of the power plant; the bromide chiller is connected to the chilled water inlet Water pipeline, chilled water outlet pipeline, cooling water inlet pipeline and cooling water discharge pipeline. The cooling water discharge pipeline is connected to the clean water side inlet of the wastewater heat exchanger, and the clean water side outlet of the wastewater heat exchanger is connected to the water purification device and the hot water tank in sequence; the clean water side inlet of the wastewater heat exchanger is connected to the heating return water pipeline, and the clean water side outlet of the wastewater heat exchanger is connected to the heating water supply pipeline. The waste heat outlet of the power plant production process is also connected to the heat source inlet of the solution regenerator, and the wastewater outlet of the solution regenerator is connected to the waste heat return water outlet of the power plant production process.

[0008] Optionally, the bromide refrigeration machine is connected to the cooling water discharge pipeline through a cooling water outlet three-way valve, the bypass outlet of the cooling water outlet three-way valve is connected to the clean water side inlet of the wastewater heat exchanger, and the cooling water outlet three-way valve is an automatic valve controlled by a liquid level signal.

[0009] Optionally, a bromide chiller inlet valve is set between the waste heat from the power plant production process and the heat source inlet of the bromide chiller, a regeneration heat source valve is set between the waste heat outlet of the power plant production process and the heat source inlet of the solution regenerator, a wastewater bypass valve is set between the waste heat from the power plant production process and the sewage inlet of the wastewater heat exchanger, a heat exchanger wastewater bypass valve is set between the heat source outlet of the bromide chiller and the return water outlet of the waste heat from the power plant production process, a heating return water valve is set between the clean water side inlet of the wastewater heat exchanger and the heating return water pipeline, and a heating water supply valve is set between the clean water side outlet of the wastewater heat exchanger and the heating water supply pipeline.

[0010] Optionally, the wastewater bypass valve, the heating return water valve, and the heating water supply valve form a group of interlocking valves, and the bromide refrigeration machine water inlet valve and the regenerative heat source valve form a group of interlocking valves.

[0011] Optionally, a flow meter is provided at the outlet of the heat exchanger wastewater bypass valve, and the heat exchanger wastewater bypass valve is an automatic valve controlled by a liquid level signal.

[0012] Optionally, the solution outlet of the solution regenerator is connected to the liquid storage tank and the dehumidification device in sequence, the solution outlet of the dehumidification device is connected to the solution inlet of the solution regenerator, the air inlet of the dehumidification device is connected to the air inlet duct, and the air outlet of the dehumidification device is connected to the exhaust duct.

[0013] Optionally, a liquid level measuring device and a temperature measuring device are provided in the hot water tank.

[0014] Optionally, the wastewater heat exchanger is an anti-corrosion and anti-scaling heat exchanger.

[0015] An operating method for utilizing waste heat from a power plant production process to supply cascade energy, applied to the above-mentioned system, includes:

[0016] In summer, the pipeline from the power plant's production process waste heat to the bromide chiller is connected, the pipeline between the power plant's production process waste heat and the solution regenerator is connected, and the pipeline between the power plant's production process waste heat and the wastewater heat exchanger is disconnected; the cooling water discharge pipeline of the bromide chiller's cooling water outlet is connected, and the pipeline from the bromide chiller's heat source outlet to the power plant's production process waste heat is connected, and the wastewater from the power plant's production process waste heat enters the bromide chiller to drive its operation, and the wastewater then returns to the power plant's production process waste heat. The bromide chiller prepares chilled water to supply air-conditioning users, and the cooling water takes away the heat from the bromide chiller and is discharged from the system; the wastewater from the power plant's production process waste heat enters the solution regenerator and then dehumidifies the solution for regeneration, and the failed dehumidification solution is sent to the solution regenerator for regeneration;

[0017] In winter, the pipeline from the power plant's production process waste heat to the wastewater heat exchanger is connected, and the heating return water pipeline and the heating water supply pipeline are both connected to the wastewater heat exchanger; the pipeline from the power plant's production process waste heat to the bromide chiller and the solution regenerator is disconnected; the cooling water discharge pipeline at the cooling water outlet of the bromide chiller is connected, and the pipeline from the bromide chiller to the power plant's production process waste heat is disconnected. The wastewater enters the wastewater heat exchanger and exchanges heat with the heating water, and then returns to the power plant's production process waste heat, and the heating water returns to the air-conditioning users. The liquid level measuring device does not work, and the hot water tank is always full.

[0018] Optionally, in summer, the regenerated solution is sent to a storage tank and then to a dehumidification device to dehumidify the wet air, and then the dry air is sent to air-conditioning users;

[0019] The liquid level measuring device measures the liquid level status of the hot water tank. When the liquid level in the hot water tank is too low, the flow of waste heat from the bromide chiller to the power plant production process is reduced, and the flow from the bromide chiller cooling water drainage pipeline to the wastewater heat exchanger is increased. Part of the cooling water discharged from the bromide chiller is sent to the wastewater heat exchanger for heating, and then the waste water returns to the power plant production process waste heat. The hot water is treated by the water purification device and sent to the hot water tank for user use. When the liquid level in the hot water tank is too high, the flow regulation method of the bromide chiller heat source outlet and the cooling water outlet is opposite.

[0020] Compared with the existing technology, the present application has at least the following beneficial effects: utilizing the waste heat of wastewater flushing to provide domestic hot water, saving the domestic hot water expenses of the power plant; being able to provide a suitable cold source for air conditioning in summer, saving the air conditioning power consumption of the power plant; being able to provide hot water for heating in winter, further broadening the scope of waste heat utilization; being able to provide heat for the regeneration of dehumidification solution, saving the energy consumption required for the regeneration of dehumidification solution; having a reasonable structural design, a unique conception, a stable operation and good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of a system for utilizing waste heat from flushing wastewater to supply multiple energy sources in an embodiment of the present application.

[0022] In the figure: 1. Waste heat from the power plant production process; 2. Bromine chiller inlet valve; 3. Wastewater bypass valve; 4. Bromine chiller; 5. Wastewater heat exchanger; 6. Heat exchanger wastewater bypass valve; 7. Chilled water inlet pipeline; 8. Chilled water outlet pipeline; 9. Cooling water inlet pipeline; 10. Cooling water outlet three-way valve; 11. Cooling water discharge pipeline; 12. Water purification device; 13. Hot water tank; 14. Liquid level measuring device; 15. Regenerative heat source valve; 16. Solution regenerator; 17. Liquid storage tank; 18. Dehumidification device; 19. Air inlet duct; 20. Exhaust duct; 21. Heating return valve; 22. Heating supply valve. DETAILED DESCRIPTION

[0023] The present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are intended to explain the present application but the present application is not limited to the following examples.

[0024] Example

[0025] Referring to Figure 1, the system for utilizing waste heat from flushing wastewater to supply multiple energy sources in this embodiment includes power plant production process waste heat 1, a bromide chiller inlet valve 2, a wastewater bypass valve 3, a bromide chiller 4, a wastewater heat exchanger 5, a heat exchanger wastewater bypass valve 6, a chilled water inlet pipeline 7, a chilled water outlet pipeline 8, a cooling water inlet pipeline 9, a cooling water outlet three-way valve 10, a cooling water discharge pipeline 11, a water purification device 12, a hot water tank 13, a liquid level measuring device 14, a regenerative heat source valve 15, a solution regenerator 16, a liquid storage tank 17, a dehumidifier 18, an air inlet duct 19, an exhaust duct 20, a heating return water valve 21, and a heating water supply valve 22. The wastewater heat exchanger 5 is typically an anti-corrosion and anti-scaling heat exchanger. The power plant production process waste heat 1 can also be broadly understood as equipment that generates waste heat from the power plant production process or equipment that centrally processes waste heat from the power plant production process.

[0026] The water outlet of the waste heat 1 from the production process of the power plant in this embodiment is respectively connected to the inlet of the bromide chiller water inlet valve 2 and the inlet of the wastewater bypass valve 3, the outlet of the bromide chiller water inlet valve 2 is connected to the heat source inlet of the bromide chiller 4, the outlet of the wastewater bypass valve 3 is respectively connected to the sewage inlet of the wastewater heat exchanger 5 and the inlet of the wastewater bypass valve 6 of the heat exchanger, the heat source outlet of the bromide chiller 4 is also respectively connected to the sewage inlet of the wastewater heat exchanger 5 and the inlet of the wastewater bypass valve 6 of the heat exchanger, the sewage outlet of the wastewater heat exchanger 5 is connected to the return water port of the waste heat 1 from the production process of the power plant, the outlet of the wastewater bypass valve 6 of the heat exchanger is connected to the return water port of the waste heat 1 from the production process of the power plant, the chilled water inlet pipeline 7 is connected to the chilled water of the bromide chiller 4 The inlet is connected, the chilled water outlet of the bromide refrigerator 4 is connected to the chilled water outlet pipeline 8, the cooling water inlet pipeline 9 is connected to the cooling water inlet of the bromide refrigerator 4, the cooling water outlet of the bromide refrigerator 4 is connected to the inlet of the cooling water outlet three-way valve 10, the straight-through outlet of the cooling water outlet three-way valve 10 is connected to the cooling water discharge pipeline 11, the bypass outlet of the cooling water outlet three-way valve 10 is connected to the clean water side inlet of the wastewater heat exchanger 5, the clean water side outlet of the wastewater heat exchanger 5 is connected to the inlet of the water purification device 12, the outlet of the water purification device 12 is connected to the inlet of the hot water tank 13, and the liquid level measuring device 14 is installed in the hot water tank 13; the outlet of the water purification device 12 is also connected to the inlet of the heating water supply valve 22.

[0027] The water outlet of the power plant production process waste heat 1 in this embodiment is also connected to the inlet of the regenerative heat source valve 15, the outlet of the regenerative heat source valve 15 is connected to the heat source inlet of the solution regenerator 16, the wastewater outlet of the solution regenerator 16 is connected to the return water outlet of the power plant production process waste heat 1, the solution outlet of the solution regenerator 16 is connected to the inlet of the liquid storage tank 17, the outlet of the liquid storage tank 17 is connected to the solution inlet of the dehumidification device 18, the solution outlet of the dehumidification device 18 is connected to the solution inlet of the solution regenerator 16, the air inlet duct 19 is connected to the air inlet of the dehumidification device 18, and the air outlet of the dehumidification device 18 is connected to the exhaust duct 20.

[0028] The outlet of the heating return water valve 21 in this embodiment is connected to the clean water side inlet of the wastewater heat exchanger 5 , and the clean water side outlet of the wastewater heat exchanger 5 is also connected to the inlet of the heating water supply valve 22 .

[0029] As an optional embodiment of the present application, the outlet of the waste heat 1 from the power plant production process can also be connected to a solution-type humidity control air conditioning system, and the waste liquid outlet of the solution-type humidity control air conditioning system is also connected to the return water outlet of the waste heat 1 from the power plant production process.

[0030] The system for supplying cascade energy by utilizing waste heat from the production process of a power plant in this embodiment includes the following channels: waste water is discharged from the waste heat 1 of the production process of the power plant, enters the bromide refrigeration machine 4, then enters the waste water heat exchanger 5, and then returns to the waste heat 1 of the production process of the power plant to form a waste heat utilization channel in summer; waste water is discharged from the waste heat 1 of the production process of the power plant, passes through the waste water bypass valve 3, then enters the waste water heat exchanger 5, and then returns to the waste heat 1 of the production process of the power plant to form a waste heat utilization channel in winter; waste water discharged from the bromide refrigeration machine 4 returns to the waste heat 1 of the production process of the power plant through the waste water bypass valve 6 of the heat exchanger to form a waste water heat exchanger bypass channel; cooling water enters the bromide refrigeration machine 4 and is discharged to form a cooling water channel. channel; after the cooling water is discharged from the bromide chiller 4, it enters the wastewater heat exchanger 5, then enters the water purification device 12, and is finally sent to the hot water tank 13 to form a domestic hot water preparation channel; the chilled water enters the bromide chiller 4 and is discharged, forming a chilled water channel; the heating water enters the wastewater heat exchanger 5 after passing through the heating return water valve 21, and then returns through the heating water supply valve 22 to form a heating water channel; the waste water is discharged from the waste heat 1 of the power plant production process, passes through the regenerative heat source valve 15, enters the solution regenerator 16, is sent to the liquid storage tank 17, and then is sent to the dehumidification device 18, and then returns to the solution regenerator 16 to form a dehumidification solution circulation channel; the humid air enters the solution regenerator 16 and is discharged, forming a dehumidified air channel.

[0031] The operating steps of the system for supplying cascade energy using waste heat from a power plant production process in this embodiment are as follows:

[0032] In summer, the bromide chiller water inlet valve 2 and the regenerative heat source valve 15 are opened at the same time, the wastewater bypass valve 3, the heating return water valve 21, and the heating water supply valve 22 are interlocked and closed, the cooling water outlet three-way valve 10 is in the straight-through part, the heat exchanger wastewater bypass valve 6 is opened, and the wastewater from the power plant production process waste heat 1 enters the bromide chiller 4 to drive its operation, and the wastewater then returns to the power plant production process waste heat 1. The bromide chiller 4 prepares chilled water to supply air-conditioning users, and the cooling water takes away the heat of the bromide chiller 4 and is discharged from the system; the wastewater from the power plant production process waste heat 1 enters the solution regenerator 16 and the dehumidified solution is regenerated. The regenerated solution is sent to the liquid storage tank 17 and sent to the dehumidification device 18 in time to dehumidify the wet air. Then the dry air is sent to the air-conditioning users, and the failed dehumidification solution is sent to the solution regenerator 16 for regeneration.

[0033] Optionally, the liquid level measuring device 14 can measure the liquid level status of the hot water tank 13 and make a judgment. When the liquid level of the hot water tank 13 is too low, the opening of the heat exchanger waste water bypass valve 6 is reduced and the opening of the bypass part of the cooling water outlet three-way valve 10 is increased. Part of the cooling water discharged from the bromide refrigeration machine 4 is sent to the waste water heat exchanger 5 for heating, and then the waste water returns to the power plant production process waste heat 1. The hot water is treated by the water purification device 12 and sent to the hot water tank 13 for user use. When the liquid level of the hot water tank 13 is too high, the adjustment methods of the heat exchanger waste water bypass valve 6 and the bypass part of the cooling water outlet three-way valve 10 are opposite.

[0034] In winter, the wastewater bypass valve 3, the heating return water valve 21, and the heating water supply valve 22 are opened at the same time, the bromide refrigeration machine water inlet valve 2 and the regenerative heat source valve 15 are interlocked and closed, the cooling water outlet three-way valve 10 is in the straight-through part, the heat exchanger wastewater bypass valve 6 is closed, the wastewater enters the wastewater heat exchanger 5 and exchanges heat with the heating water and then returns to the power plant production process waste heat 1, and the heating water returns to the air-conditioning user, the liquid level measuring device 14 does not work, and the hot water tank 13 is always in a full state.

[0035] In summary, the present application provides a system for supplying multiple energy sources using industrial waste heat, which broadens the scope of utilization of waste heat and waste heat from power plant production. The present application can effectively utilize industrial waste heat to supply domestic hot water, and can also utilize waste heat for air conditioning, heating, and regeneration of working fluids, thereby improving the economic benefits of the waste heat utilization system. The present application first utilizes industrial waste heat to provide domestic hot water, saving the domestic hot water expenses of the power plant; second, it can provide a suitable cold source for air conditioning in the summer, saving the power consumption of air conditioning in the power plant; third, it can provide hot water for heating in the winter, broadening the scope of waste heat utilization; fourth, it can provide heat for the regeneration of dehumidification solution, saving the energy consumption required for the regeneration of dehumidification solution. The system for supplying multiple energy sources of the present application has high energy utilization efficiency and good economic benefits, and can well broaden the scope of utilization of waste heat and waste heat from the production process of power plants.

[0036] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of this application. Any equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of this application are included in the protection scope of this patent. Technicians in the technical field of this application can make various modifications or supplements to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of this application or exceed the scope defined by the claims, they should fall within the protection scope of this application.

Claims

1. A system for supplying cascade energy using waste heat from a power plant production process, characterized by: The invention comprises a power plant production process waste heat (1), a bromide refrigeration machine (4), a wastewater heat exchanger (5), a water purification device (12), a hot water tank (13), a solution regenerator (16), a liquid storage tank (17) and a dehumidification device (18); the power plant production process waste heat (1) is connected to the heat source inlet of the bromide refrigeration machine (4) and the sewage inlet of the wastewater heat exchanger (5); the heat source outlet of the bromide refrigeration machine (4) is respectively connected to the sewage inlet of the wastewater heat exchanger (5) and the return water port of the power plant production process waste heat (1); the bromide refrigeration machine (4) is connected to a chilled water inlet pipe (7), a chilled water outlet pipe (8), a cooling water inlet pipe (9), and a cooling water outlet pipe (10). The water pipeline (9) and the cooling water discharge pipeline (11) are connected to the clean water side inlet of the wastewater heat exchanger (5), and the clean water side outlet of the wastewater heat exchanger (5) is connected to the water purification device (12) and the hot water tank (13) in sequence; the clean water side inlet of the wastewater heat exchanger (5) is connected to the heating return water pipeline, and the clean water side outlet of the wastewater heat exchanger (5) is connected to the heating water supply pipeline. The outlet of the waste heat (1) of the power plant production process is also connected to the heat source inlet of the solution regenerator (16), and the waste water outlet of the solution regenerator (16) is connected to the return water outlet of the waste heat (1) of the power plant production process.

2. The system for supplying cascade energy using waste heat from power plant production processes according to claim 1 is characterized in that: The bromide refrigeration machine (4) is connected to the cooling water discharge pipeline (11) through the cooling water outlet three-way valve (10), and the bypass outlet of the cooling water outlet three-way valve (10) is connected to the clean water side inlet of the wastewater heat exchanger (5). The cooling water outlet three-way valve (10) is an automatic valve controlled by a liquid level signal.

3. The system for supplying cascade energy using waste heat from power plant production processes according to claim 1 is characterized in that: A bromide refrigeration machine water inlet valve (2) is provided between the power plant production process waste heat (1) and the heat source inlet of the bromide refrigeration machine (4); a regeneration heat source valve (15) is provided between the power plant production process waste heat (1) and the heat source inlet of the solution regenerator (16); a wastewater bypass valve (3) is provided between the power plant production process waste heat (1) and the sewage inlet of the wastewater heat exchanger (5); a heat exchanger wastewater bypass valve (6) is provided between the bromide refrigeration machine (4) heat source outlet and the power plant production process waste heat (1) return water outlet; a heating return water valve (21) is provided between the clean water side inlet of the wastewater heat exchanger (5) and the heating return water pipeline; and a heating water supply valve (22) is provided between the clean water side outlet of the wastewater heat exchanger (5) and the heating water supply pipeline.

4. The system for supplying cascade energy using waste heat from power plant production processes according to claim 3 is characterized in that: The wastewater bypass valve (3), the heating return water valve (21), and the heating water supply valve (22) form a group of interlocking valves, and the bromide refrigeration machine water inlet valve (2) and the regenerative heat source valve (15) form a group of interlocking valves.

5. The system for supplying cascade energy using waste heat from power plant production processes according to claim 3 is characterized in that: A flow meter is provided at the outlet of the heat exchanger wastewater bypass valve (6), which is an automatic valve controlled by a liquid level signal.

6. The system for supplying cascade energy using waste heat from power plant production processes according to claim 1 is characterized in that: The solution outlet of the solution regenerator (16) is connected to the liquid storage tank (17) and the dehumidification device (18) in sequence, the solution outlet of the dehumidification device (18) is connected to the solution inlet of the solution regenerator (16), the air inlet of the dehumidification device (18) is connected to the air inlet duct (19), and the air outlet of the dehumidification device (18) is connected to the exhaust duct (20).

7. The system for supplying cascade energy using waste heat from power plant production processes according to claim 1 is characterized in that: A liquid level measuring device (14) and a temperature measuring device are provided in the hot water tank (13).

8. The system for supplying cascade energy using waste heat from power plant production processes according to claim 1 is characterized in that: The wastewater heat exchanger (5) is an anti-corrosion and anti-scaling heat exchanger.

9. An operating method for supplying cascade energy using waste heat from a power plant production process, applied to a system according to any one of claims 1 to 8, characterized in that: The operation method includes: In summer, the pipeline from the waste heat (1) of the power plant production process to the bromide refrigeration machine (4) is connected, the pipeline between the waste heat (1) of the power plant production process and the solution regenerator (16) is connected, and the pipeline between the waste heat (1) of the power plant production process and the waste water heat exchanger (5) is disconnected; the cooling water discharge pipeline of the cooling water outlet of the bromide refrigeration machine (4) is connected, and the pipeline from the heat source outlet of the bromide refrigeration machine (4) to the waste heat (1) of the power plant production process is connected, and the waste water of the waste heat (1) of the power plant production process enters the bromide refrigeration machine (4) to drive its operation, and the waste water then returns to the waste heat (1) of the power plant production process, and the bromide refrigeration machine (4) prepares chilled water to supply air conditioning users, and the cooling water takes away the heat of the bromide refrigeration machine (4) and is discharged from the system; the waste water of the waste heat (1) of the power plant production process enters the solution regenerator (16) and then the dehumidification solution is regenerated, and the failed dehumidification solution is sent to the solution regenerator (16) for regeneration; In winter, the pipeline from the power plant production process waste heat (1) to the waste water heat exchanger (5) is connected, and the heating return water pipeline and the heating water supply pipeline are both connected to the waste water heat exchanger (5); the pipeline from the power plant production process waste heat (1) to the bromide refrigeration machine (4) and the solution regenerator (16) is disconnected; the cooling water discharge pipeline at the cooling water outlet of the bromide refrigeration machine (4) is connected, and the pipeline from the bromide refrigeration machine (4) to the power plant production process waste heat (1) is disconnected, and the waste water enters the waste water heat exchanger (5) and exchanges heat with the heating water and then returns to the power plant production process waste heat (1), and the heating water returns to the air conditioning user, the liquid level measuring device (14) does not work, and the hot water tank (13) is always in a full state.

10. The operating method according to claim 9, characterized in that: In summer, the regenerated solution is sent to the liquid storage tank (17) and then to the dehumidification device (18) to dehumidify the wet air, and then the dry air is sent to the air-conditioning users; The liquid level measuring device (14) measures the liquid level of the hot water tank (13). When the liquid level of the hot water tank (13) is too low, the flow rate from the bromide refrigeration machine (4) to the power plant production process waste heat (1) is reduced, and the flow rate from the bromide refrigeration machine (4) cooling water drainage pipeline to the waste water heat exchanger (5) is increased. Part of the cooling water discharged from the bromide refrigeration machine (4) is sent to the waste water heat exchanger (5) for heating, and then the waste water is returned to the power plant production process waste heat (1). The hot water is processed by the water purification device (12) and sent to the hot water tank (13) for user use. When the liquid level of the hot water tank (13) is too high, the flow rate regulation mode of the heat source outlet and the cooling water outlet of the bromide refrigeration machine (4) is opposite.

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