阅读说明：本技术 一种基于电厂循环水的空调系统及其运行方法 (Air conditioning system based on circulating water of power plant and operation method thereof ) 是由 王春磊 张先提 杨锋斌 黄燕娜 于 2021-08-03 设计创作，主要内容包括：本发明涉及电厂余热利用技术领域,尤其涉及一种基于电厂循环水的空调系统及其运行方法,包括冷热源系统、热循环系统和用户系统。冷热源系统包括汽轮机、凝汽器、循环水泵、冷却水塔、冷却水池和阀门。热循环系统包括管道和内能交换装置。用户系统包括冷热水循环泵、冷热用户以及阀门。将带有电厂中排出的带有内能的水蒸气通过汽轮机和凝汽器将内能传递至系统中的冷却水,在供热循环下,带有内能的冷却水通过热能交换装置供用户系统制热后,失去内能的冷却水回到系统中再利用；在制冷循环下,在冷却水塔、冷却池和热能交换装置的作用下,冷却水吸收用户系统的内能使用户系统实现制冷,带走用户系统的内能的冷却水回到冷却水塔中再循环使用。(The invention relates to the technical field of waste heat utilization of power plants, in particular to an air conditioning system based on circulating water of a power plant and an operation method thereof. The cold and heat source system comprises a steam turbine, a condenser, a circulating water pump, a cooling water tower, a cooling water pool and a valve. The heat cycle system comprises a pipeline and an internal energy exchange device. The user system comprises a cold and hot water circulating pump, a cold and hot user and a valve. The method comprises the following steps that (1) steam with internal energy discharged from a power plant is transmitted to cooling water in a system through a steam turbine and a condenser, and under the condition of heat supply circulation, the cooling water with the internal energy is supplied to a user system for heating through a heat energy exchange device, and then the cooling water losing the internal energy returns to the system for reuse; under refrigeration circulation, under the action of the cooling water tower, the cooling pool and the heat energy exchange device, cooling water absorbs the internal energy of the user system to refrigerate the user system, and cooling water taking away the internal energy of the user system returns to the cooling water tower for recycling.)

1. An air conditioning system based on power plant circulating water, comprising:

the cold and heat source system comprises a steam turbine, a condenser, a circulating water pump, a cooling water tower, a cooling water pool, a hot water switching valve, a cold water return valve and a hot water return valve, wherein the output end of the steam turbine is connected with the first input end of the condenser, the input end of the hot water switching valve, the second output end of the condenser and the output end of the cold water return valve are connected with the input end of the cooling water tower, the input end of the cold water switching valve is connected with the output end of the circulating water pump, the output end of the hot water return valve is connected with the output end of the cooling water tower, and the cooling water pool is arranged between the circulating water pump and the output end of the cooling water tower;

the heat circulation system comprises a cold water input pipe, a hot water input pipe, a cold water output pipe, a hot water output pipe and an internal energy exchange device, wherein the output end of the hot water switching valve is connected with the input end of the hot water input pipe, the output end of the cold water switching valve is connected with the input end of the cold water input pipe, the input end of the cold water return valve is connected with the output end of the hot water output pipe, and the input end of the hot water return valve is connected with the output end of the cold water output pipe;

and the user system comprises a cold and hot water circulating pump, a cold and hot user and a plurality of valves.

2. The power plant circulating water-based air conditioning system according to claim 1, further comprising a control system, wherein the control system comprises control elements such as a temperature sensor, a pressure sensor, a flow sensor and a central controller, which are respectively arranged on inlet and outlet pipelines of each device.

3. The power plant circulating water-based air conditioning system according to claim 1, wherein the heat cycle system comprises an input main pipe, an output main pipe and a water collecting and distributing device, an output end of the hot water switching valve and an output end of the cold water switching valve are connected to an input end of the input main pipe, an input end of the cold water return valve and an input end of the hot water return valve are connected to an output end of the output main pipe, and the water collecting and distributing device is used for controlling water flow delivery of the input main pipe, the output main pipe, the cold water input pipe, the hot water input pipe, the cold water output pipe and the hot water output pipe.

4. The power plant circulating water based air conditioning system of claim 3, the water dividing and collecting device comprises a first water dividing and collecting device, a second water dividing and collecting device, a third water dividing and collecting device and a fourth water dividing and collecting device, the heat cycle system comprises a first switching valve, a second switching valve and a water source heat pump machine with an evaporation side and a condensation side, the first water separator is connected with the input header pipe, the input end of the evaporation side and the input end of the condensation side, the second water dividing collector is connected with the output header pipe, the output end of the evaporation side and the output end of the condensation side, the third water distribution and collection device is connected with the output end of the user system, the input end of the evaporation side and the input end of the condensation side, the fourth water collector is connected with the input end of the user system, the output end of the evaporation side and the output end of the condensation side.

5. The power plant circulating water-based air conditioning system of claim 4, wherein the water source heat pump machine comprises a compressor, a condenser, an expansion valve, an evaporator and inlet and outlet water valves, the evaporator is arranged on the evaporation side, the condenser is arranged on the condensation side, the compressor and the expansion valve are arranged between the evaporator and the condenser, and the inlet and outlet water valves are used for controlling water inlet and outlet of the water source heat pump machine.

6. The power plant circulating water based air conditioning system of claim 4, wherein there are at least two water source heat pump machines, and two of the water source heat pump machines are connected in parallel.

7. The power plant circulating water-based air conditioning system according to claim 1, wherein the number of the hot and cold users is at least two, a plurality of the hot and cold users are connected in parallel, and each hot and cold user is provided with the valve.

8. The power plant circulating water-based air conditioning system of claim 1, wherein the hot and cold water circulating pump is a variable frequency water pump.

9. The power plant circulating water-based air conditioning system according to claim 1, wherein an output end of the condenser is connected with an input end of a power plant boiler.

10. A method for operating a power plant circulating water based air conditioning system according to any one of claims 1 to 9, characterized in that the method comprises,

heating circulation:

firstly, converting superheated steam output by a power plant into dead steam with kinetic energy through the steam turbine;

secondly, the exhaust steam converts kinetic energy into internal energy of cooling water through the condenser, and circulating cooling water with the internal energy flows to the internal energy exchange device after being input to the hot water input pipe through the hot water switching valve;

thirdly, after the internal energy in the circulating cooling water is converted into a usable state of a user system through the internal energy exchange device, the internal energy is output to the cold and hot users through the cold and hot water circulating pump to realize heating;

fourthly, the heated circulating cooling water is output to the hot water return valve through the cold water output pipe under the action of the circulating water pump and flows to the cooling water pool;

after cooling by the cooling water pool, cooling water flows back to the condenser to complete heating circulation;

refrigeration cycle:

firstly, converting superheated steam output by a power plant into dead steam with kinetic energy through the steam turbine;

secondly, the exhaust steam is converted into the internal energy of circulating cooling water through the condenser, and the circulating cooling water with the internal energy is cooled by the cooling water tower and the cooling water pool, is input into the cold water input pipe through the cold water switching valve and then flows to the internal energy exchange device;

absorbing the internal energy in the user system in the internal energy exchange device so as to realize refrigeration of the user system;

fourthly, the circulating cooling water absorbing the internal energy in the user system is output to the cold water return valve through the hot water output pipe under the action of the circulating water pump and flows to the cooling water tower;

and fifthly, after cooling by the cooling water tower and the cooling water pool, circulating cooling water flows back to the condenser to complete refrigeration circulation.

Technical Field

The invention belongs to the technical field of waste heat utilization of power plants, and particularly relates to an air conditioning system based on circulating water of a power plant and an operation method thereof.

Background

In the process of thermal power generation, for improving the vacuum degree of the condenser and improving the power generation efficiency, cooling water is often adopted to cool the condenser, the heat of the condenser is taken away by cooling water energy, and the exhaust vacuum degree of the steam turbine is improved. Generally, the heat carried away by the cooling water is released to the atmosphere by heat exchange between the cooling water tower and the air. Research shows that the energy utilization efficiency of a large coal-fired power plant is about 40%, more than 30% of heat can be discharged into the environment through circulating cooling water, a large amount of energy is wasted, and the local ecological environment is also influenced.

Disclosure of Invention

Based on the air conditioning system, the air conditioning system based on the circulating water of the power plant can efficiently utilize the internal energy in the circulating water of the power plant.

The technical scheme of the invention is as follows: the utility model provides an air conditioning system based on power plant's circulating water, includes cold and heat source system, thermal cycle system and user's system, wherein:

the cold and heat source system comprises a steam turbine, a condenser, a circulating water pump, a cooling water tower, a cooling water pool, a hot water switching valve, a cold water return valve and a hot water return valve, wherein the output end of the steam turbine is connected with the first input end of the condenser, the input end of the hot water switching valve, the second output end of the condenser and the output end of the cold water return valve are connected with the input end of the cooling water tower, the input end of the cold water switching valve is connected with the output end of the circulating water pump, the output end of the hot water return valve is connected with the output end of the cooling water tower, and the cooling water pool is arranged between the circulating water pump and the output end of the cooling water tower;

the heat circulation system comprises a cold water input pipe, a hot water input pipe, a cold water output pipe, a hot water output pipe and an internal energy exchange device, wherein the output end of the hot water switching valve is connected with the input end of the hot water input pipe through a second water outlet of a first water distribution collector, the output end of the cold water switching valve is connected with the input end of the cold water input pipe through a first water outlet of the first water distribution collector, the input end of the cold water return valve is connected with the output end of the hot water output pipe through a second water inlet of a second water distribution collector, and the input end of the hot water return valve is connected with the output end of the cold water output pipe through a third water inlet of the second water distribution collector;

and the user system comprises a cold and hot water circulating pump, a cold and hot user and a plurality of valves.

Optionally, the system further comprises a control system, wherein the control system comprises control elements, such as a temperature sensor, a pressure sensor, a flow sensor, a central controller and the like, which are respectively arranged on the inlet and outlet pipelines of each device.

Optionally, the heat cycle system includes an input main pipe, an output main pipe and a water collecting and collecting device, an output end of the hot water switching valve and an output end of the cold water switching valve are connected to an input end of the input main pipe, an input end of the cold water return valve and an input end of the hot water return valve are connected to an output end of the output main pipe, and the water collecting and collecting device is configured to control water flow delivery of the input main pipe, the output main pipe, the cold water input pipe, the hot water input pipe, the cold water output pipe and the hot water output pipe.

Optionally, the water diversion and collection device includes a first water diversion and collection device, a second water diversion and collection device, the heat cycle system includes a first switching valve, a second switching valve, and a water source heat pump with an evaporation side and a condensation side, the first water diversion and collection device is connected to the input header, the input of the evaporation side, and the input of the condensation side, the second water diversion and collection device is connected to the output header, the output of the evaporation side, and the output of the condensation side, the third water diversion and collection device is connected to the output of the user system, the input of the evaporation side, and the input of the condensation side, and the fourth water diversion and collection device is connected to the input of the user system, the output of the evaporation side, and the output of the condensation side.

Optionally, the water source heat pump machine includes compressor, condenser, expansion valve, evaporimeter and import and export water valve, the evaporimeter is located the evaporation side, the condenser is located the condensation side, the compressor with the expansion valve is located the evaporimeter with between the condenser, import and export water valve is used for controlling water source heat pump machine's business turn over water.

Optionally, the number of the water source heat pump machines is at least two, and the two water source heat pump machines are connected in parallel.

Optionally, the number of the cold and hot users is at least two, the cold and hot users are connected in parallel, and each cold and hot user is provided with the valve.

Optionally, the cold and hot water circulating pump is a variable frequency water pump.

Optionally, the output end of the condenser is connected with the input end of the power plant boiler.

The operation method of the air conditioning system based on the circulating water of the power plant comprises the following steps,

heating circulation:

firstly, converting superheated steam output by a power plant into dead steam with kinetic energy through the steam turbine;

secondly, the exhaust steam converts kinetic energy into internal energy of cooling water through the condenser, and circulating cooling water with the internal energy flows to the internal energy exchange device after being input to the hot water input pipe through the hot water switching valve;

thirdly, after the internal energy in the circulating cooling water is converted into a usable state of a user system through the internal energy exchange device, the internal energy is output to the cold and hot users through the cold and hot water circulating pump to realize heating;

outputting the heated circulating cooling water to the hot water return valve through the output header pipe and flowing to the cooling water pool under the action of the circulating water pump;

after cooling by the cooling water pool, cooling water flows back to the condenser to complete heating circulation;

refrigeration cycle:

firstly, converting superheated steam output by a power plant into dead steam with kinetic energy through the steam turbine;

secondly, the exhaust steam is converted into the internal energy of circulating cooling water through the condenser, and the circulating cooling water with the internal energy is cooled by the cooling water tower and the cooling water pool, is input into the input header pipe through the cold water switching valve and then flows to the internal energy exchange device;

absorbing the internal energy in the user system in the internal energy exchange device so as to realize refrigeration of the user system;

fourthly, the circulating cooling water absorbing the internal energy in the user system is output to the cold water return valve through the output main pipe and flows to the cooling water tower under the action of the circulating water pump;

and fifthly, after cooling by the cooling water tower and the cooling water pool, circulating cooling water flows back to the condenser to complete refrigeration circulation.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

according to the air conditioning system based on the circulating water of the power plant, the internal energy of the steam with the internal energy discharged from the power plant is transferred to the cooling water in the system through the steam turbine and the condenser, and under the condition of heat supply circulation, the cooling water with the internal energy is supplied to a user system for heating through the heat energy exchange device, and then the cooling water losing the internal energy returns to the system for reuse; under refrigeration circulation, under the action of the cooling water tower, the cooling pool and the heat energy exchange device, cooling water absorbs the internal energy of the user system to refrigerate the user system, and cooling water taking away the internal energy of the user system returns to the cooling water tower for recycling.

Drawings

Fig. 1 is a schematic structural diagram of an air conditioning system based on circulating water of a power plant according to an embodiment of the invention.

Fig. 2 is a schematic structural diagram of a heating cycle of an air conditioning system based on circulating water of a power plant according to an embodiment of the invention.

Fig. 3 is a schematic structural diagram of a refrigeration cycle of an air conditioning system based on circulating water of a power plant according to an embodiment of the invention.

Description of reference numerals:

100. an air conditioning system based on circulating water of a power plant,

1. a steam turbine is provided with a steam turbine,

2. 2-1 parts of a condenser, 2-2 parts of a first input end of the condenser, 2-3 parts of a first output end of the condenser, 2-4 parts of a second output end of the condenser and a second input end of the condenser,

3. a cooling water tower is arranged in the water tank,

4. a water cooling tank is arranged in the water tank,

5. a water circulating pump is arranged on the water tank,

6. a hot water switching valve is arranged on the hot water tank,

7. a cold water switching valve is arranged on the water tank,

8. a first water dividing collector 8-1, a first water inlet 8-2, a first water outlet 8-3 and a second water outlet,

9. 9-1 parts of a second water collector, 9-2 parts of a third water outlet, 9-3 parts of a third water inlet and a second water inlet,

10. a third water dividing collector 10-1, a fourth water inlet 10-2, a fourth water outlet 10-3 and a fifth water outlet,

11. a fourth water collector 11-1, a sixth water outlet 11-2, a sixth water inlet 11-3 and a fifth water inlet,

12. a cold and hot water circulating pump,

13. a first water source heat pump machine 13-1, a compressor 13-2, a condenser 13-3, an expansion valve 13-4, an evaporator 13-5, inlet and outlet water valves,

14. a second water source heat pump machine which is connected with the water source heat pump machine,

15. a third water source heat pump machine which is connected with the water source heat pump machine,

16. a first switching valve is arranged on the base plate,

17. a second switching valve for switching the first switching valve,

18. a third switching valve for the second switching valve,

19. a fourth switching valve for switching the first and second switching valves,

20. a fifth switching valve for switching the first and second switching valves,

21. a sixth switching valve for switching the first and second switching valves,

22. a seventh switching valve for switching the switching valve,

23. an eighth switching valve for switching the switching valve,

24. the temperature of the user can be controlled by the user,

25. a cold water return valve is arranged on the water tank,

26. a hot water return valve is arranged on the hot water tank,

27. a cold water input pipe is arranged on the cold water tank,

28. a hot water input pipe is arranged on the hot water tank,

29. a hot water output pipe is arranged on the hot water tank,

30. a cold water output pipe is arranged on the cold water tank,

31. a temperature sensor is arranged at the bottom of the shell,

32. the central control unit is used for controlling the central control unit,

33. an input header pipe is connected with the input end of the air conditioner,

34. an output main pipe is arranged at the upper part of the main pipe,

A. a cold and heat source system, a heat circulation system, a user system.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In addition, the terms "first", "second", and the like are employed in the present invention to describe various information, but the information should not be limited to these terms, which are used only to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

Referring to fig. 1 and fig. 2, this embodiment provides an air conditioning system 100 based on circulating water of a power plant, which includes a cold and heat source system a, a heat circulation system B, and a user system C, wherein the cold and heat source system a includes a steam turbine 1, a steam condenser 2, a cooling water tower 3, a cooling water tank 4, a circulating water pump 5, a hot water switching valve 6, a cold water switching valve 7, a cold water return valve 25, and a hot water return valve 26, a first input end steam inlet 2-1 of the steam condenser 2 is connected to an output end of the steam turbine 1 through a pipeline, a second output end cooling water outlet 2-3 of the steam condenser 2 is connected to an input end of the cooling water tower 3 through a pipeline, an output end of the cooling water tower 3 is connected to the cooling water tank 4, the cooling water tank 4 is connected to an input end of the circulating water pump 5, an output end of the circulating water pump 5 is connected to a second input end water inlet 2-4 of the cooling water of the steam condenser 2 through a pipeline, a cooling cycle is formed. The input end of the hot water switching valve 6 and the output end of the cold water return valve 25 are connected with the input end of the cooling water tower 3, the input end of the cold water switching valve 7 is connected with the output end of the circulating water pump 5, and the output end of the hot water return valve 26 is connected with the output end of the cooling water tower 3.

The heat circulation system B comprises a cold water input pipe 27, a hot water input pipe 28, a cold water output pipe 30, a hot water output pipe 29 and a heat energy exchange device, wherein the output end of the hot water switching valve 6 is connected with the input end of the hot water input pipe 28, the output end of the cold water switching valve 7 is connected with the input end of the cold water input pipe 27, the input end of the cold water return valve 25 is connected with the output end of the hot water output pipe 29, and the input end of the hot water return valve 26 is connected with the output end of the cold water output pipe 30.

The user system C comprises a hot and cold water circulation pump 12, a hot and cold user 24 and several valves.

The method comprises the following steps that (1) steam with internal energy discharged from a power plant is transmitted to circulating cooling water in a system through a steam turbine 1 and a condenser 2, and the circulating cooling water with the internal energy returns to the system for reuse after being supplied to a user system for heating through a heat energy exchange device under heating circulation; under the refrigeration cycle, under the action of the cooling water tower 3, the cooling pool 4 and the heat energy exchange device, the circulating cooling water absorbs the internal energy of the user system to refrigerate the user system, and the circulating cooling water taking away the internal energy of the user system returns to the cooling water tower for recycling.

Preferably, in this embodiment, the air conditioning system 100 based on the circulating water of the power plant further includes a control system, the control system includes control elements, such as a temperature sensor 31, a pressure sensor, a flow sensor, and a central controller 32, which are respectively disposed on the inlet and outlet pipelines of each device, and some of the sensors are not shown in the figure. The air conditioning system can be adjusted and monitored in real time through the control system.

Preferably, in this embodiment, the heat cycle system B includes an input manifold 33, an output manifold 34 and a water collecting and distributing device, the output end of the hot water switching valve 6 and the output end of the cold water switching valve 7 are connected to the input end of the input manifold 33, the input end of the cold water returning valve 25 and the input end of the hot water returning valve 26 are connected to the output end of the output manifold 34, and the water collecting and distributing device is used for controlling the water flow delivery of the input manifold 33, the output manifold 34, the cold water input pipe 27, the hot water input pipe 28, the cold water output pipe 30 and the hot water output pipe 29. The pipelines in the heat circulation system are gathered and sorted through the input main pipe 33, the output main pipe 34 and the water collecting and distributing device, so that materials used in the system can be reduced, and the pipeline layout in the system can be more reasonable.

Preferably, in the present embodiment, the water collecting and dividing device includes a first water collecting and dividing device 8, a second water collecting and dividing device 9, a third water collecting and dividing device 10 and a fourth water collecting and dividing device 11. Specifically, in this embodiment, each water dividing and collecting device has three openings: the first water inlet 8-1 of the first water collecting sub-collector 8 is connected with the input header pipe 33, the second water inlet 9-3 of the second water collecting sub-collector 9 is connected with one end of the hot water output pipe 29 and controlled by the third switching valve 18, the third water inlet 9-2 of the second water collecting sub-collector 9 is connected with one end of the cold water output pipe 30 and controlled by the fourth switching valve 19, the fourth water inlet 10-1 of the third water collecting sub-collector 10 is connected with the output end of the user system, the fifth water inlet 11-3 of the fourth water collecting sub-collector 11 is connected with the other end of the hot water output pipe 29 and controlled by the seventh switching valve 22, the sixth water inlet 11-2 of the fourth water collecting sub-collector 11 is connected with the other end of the cold water output pipe 30 and controlled by the eighth switching valve 23, the first water outlet 8-2 of the first water collecting sub-collector 8 is connected with one end of the cold water input pipe 27 and controlled by the first switching valve 16, the second water outlet 8-3 of the first water collecting sub-collector 8 is connected with one end of the hot water input pipe 28 and controlled by the second switching valve 28 The valve 17 is controlled, the third water outlet 9-1 of the second sub-collector 9 is connected with the output header pipe 34, the fourth water outlet 10-2 of the third sub-collector 10 is connected with the other end of the cold water input pipe 27 and is controlled by the fifth switching valve 20, the other end of the fifth water outlet 10-3 of the third sub-collector 10 is connected with the hot water input pipe 28 and is controlled by the sixth switching valve 21, and the sixth water outlet 11-1 of the fourth sub-collector 11 is connected with the input end of the user system.

The heat cycle system B comprises a first water source heat pump machine 13 with an evaporation side and a condensation side, the first water source heat pump machine 13 comprises a compressor 13-1, a condenser 13-2, an expansion valve 13-3, an evaporator 13-4 and an inlet and outlet water valve 13-5, the evaporator 13-4 is arranged at the evaporation side, the condenser 13-2 is arranged at the condensation side, the compressor 13-1 and the expansion valve 13-3 are arranged between the evaporator 13-4 and the condenser 13-2, and the inlet and outlet water valve 13-5 is used for controlling water inlet and outlet of the first water source heat pump machine 13. The input of the evaporation side is connected to a hot water input pipe 28, the output of the evaporation side is connected to a cold water output pipe 30, the input of the condensation side is connected to a cold water input pipe 27, and the output of the condensation side is connected to a hot water output pipe 29.

During the heating cycle, the circulating cooling water with internal energy flows into the evaporation side of the first water source heat pump machine 13 from the hot water input pipe 28, transfers the internal energy to the condensation side through the compressor 13-1 and the expansion valve 13-3, and transfers the internal energy to the user system through the hot water output pipe 29.

During the refrigeration cycle, the tail-end circulating water with internal energy in the user system flows into the evaporation side of the first water-source heat pump machine 13 through the hot water input pipe 28, the internal energy is transmitted to the condensation side through the compressor 13-1 and the expansion valve 13-3, the internal energy is transmitted to the cold and heat source system through the hot water output pipe 29, and the internal energy is dissipated to the atmosphere through the cooling water tower 3. The tail-end circulating water losing the internal energy enters the user system to continuously take away the heat of the user, and refrigeration of the user system is realized.

Preferably, in this embodiment, there are at least two water source heat pump machines. Specifically, in the present embodiment, the number of the water-source heat pump machines is three, and the three water-source heat pump machines are connected in parallel and are respectively referred to as a first water-source heat pump machine 13, a second water-source heat pump machine 14, and a third water-source heat pump machine 15. The first water source heat pump machine 13, the second water source heat pump machine 14 and the third water source heat pump machine 15 have the same structure and operation mode, the second water source heat pump machine 14 and the third water source heat pump machine 15 are represented by the first water source heat pump machine 13, and the number of the water source heat pump machines can be increased or decreased according to actual conditions. The water valves at the inlet and the outlet and the running state of the unit can be controlled by the central controller 32, so that one unit can run independently or multiple units can run jointly, and the efficiency of the refrigeration cycle and the heating cycle in the system can be improved.

Preferably, in this embodiment, there are at least two hot and cold users, and a plurality of hot and cold users are connected in parallel, and each hot and cold user is provided with a valve. Specifically, a fourth water collecting sub-collector water inlet 11-1 is connected with an inlet of a cold and hot water circulating pump 12, user water inlets of a first cold and hot user 24-1, a second cold and hot user 24-2 and a third cold and hot user 24-3 … … nth cold and hot user 24-n are connected with a sixth water outlet 11-1 through a cold and hot circulating water pump 12, and a user water outlet is connected with a fourth water inlet 10-1 of a third water collecting sub-collector 10 through a pipeline so as to realize water circulation at the tail end of a user system, and independent control and adjustment are realized through valves arranged on each cold and hot user.

Preferably, in this embodiment, the cold and hot water circulating pump is a variable frequency water pump, and the flow rate of the water pump can be automatically adjusted by the central controller 32 according to the temperature difference between the supply water and the return water, which is indicated by the temperature difference sensor, so as to maintain the temperature of the supply water and the return water constant.

Preferably, in this embodiment, the first output end 2-2 of the condenser 2 is connected to the input end of the power plant boiler. The cooled cooling water can be reused by power plants.

The invention discloses an operation method of an air conditioning system based on the circulating water of a power plant, which comprises a refrigeration cycle and a heating cycle, wherein,

the heating cycle includes:

firstly, converting superheated steam output by a power plant into dead steam with kinetic energy through a steam turbine 1;

secondly, the kinetic energy of the exhaust steam is converted into the internal energy of cooling water through the condenser 2, and the circulating cooling water with the internal energy is input into the hot water input pipe 28 through the hot water switching valve 6 and then flows to the heat energy exchange device;

thirdly, after the internal energy in the circulating cooling water is converted into a usable state of a user system through the heat energy exchange device, the internal energy is output to a cold and hot user through the cold and hot water circulating pump 12 to realize heating;

fourthly, the heated cooling water is output to a hot water return valve 26 through an output header pipe under the action of a circulating water pump 5 and flows to the cooling water pool 4;

after being cooled by the cooling water pool 4, cooling water flows back to the condenser 2 to complete heating circulation;

the refrigeration cycle includes:

firstly, converting superheated steam output by a power plant into dead steam with kinetic energy through a steam turbine 1;

secondly, the exhaust steam is converted into the internal energy of the circulating cooling water through the condenser 2, and the circulating cooling water with the internal energy is cooled through the cooling water tower 3 and the cooling water tank 4, is input into the input header pipe 33 through the cold water switching valve 7 and then flows to the heat energy exchange device;

absorbing internal energy in the user system in the heat energy exchange device, thereby realizing refrigeration of the user system;

fourthly, the circulating cooling water absorbing the internal energy in the user system is output to the cold water return valve 25 through the output main pipe 34 and flows to the cooling water tower 3 under the action of the circulating water pump 5;

fifthly, cooling water flows back to the condenser 2 after being cooled by the cooling water tower 3 and the cooling water pool 4, and the refrigeration cycle is completed.

In particular, the method comprises the following steps of,

firstly, referring to fig. 2, in the heating cycle, the opened valves include a hot water switching valve 6, a second switching valve 17, a fourth switching valve 19, a hot water return valve 26, a fifth switching valve 20, a seventh switching valve 22, and a first water source heat pump unit water valve 13-5;

the closed valves include a cold water switching valve 7, a first switching valve 16, a third switching valve 18, a cold water returning valve 25, a sixth switching valve 21, and an eighth switching valve 23.

The heating cycle comprises heat exchange between the cold and heat source system A and the heat circulation system B, and heat exchange between the heat circulation system B and the user system C.

Wherein, the heat exchange between the cold and heat source system A and the heat circulation system B comprises: the exhaust steam of the steam turbine 1 is condensed by the condenser 2 to release heat. The heat released by the condenser 2 is taken away by circulating cooling water, and the water coming out from the second output end 2-3 of the condenser 2 is divided into two paths: one path exchanges heat with air in the cooling water tower 3 and is released to the atmospheric environment; the other path enters an input header pipe 33 through a hot water switching valve 6, flows into a first water dividing collector 8 through a first water inlet 8-1, flows out through a second water outlet 8-3 of the first water dividing collector, enters a first water source heat pump unit evaporator 13-4 through a second switching valve 17 to release heat, enters a second water dividing collector 9 through a fourth switching valve 19 and a third water inlet 9-2, flows through a hot water return valve 26 through a third water outlet 9-1 of the second water dividing collector, enters the output end of a cooling water tower 3, flows into a cooling water tank 4, and is sent to a second input end 2-4 of a condenser through a circulating water pump 5 to complete circulation.

The heat exchange between the heat cycle system B and the user system C comprises the following steps: after flowing out from the cold and hot users, the tail-end circulating water flows into the third water dividing collector 10 through the fourth water inlet 10-1, flows into the condenser 13-2 of the first water source heat pump machine 13 through the fourth water outlet 10-2 to absorb heat, flows to the fourth water dividing collector 11 through the seventh switching valve 22, flows back to the cold and hot users through the sixth water outlet 11-1 of the fourth water dividing collector 11, and completes circulation.

Referring to fig. 3, in the refrigeration cycle, the opened valves include a cold water switching valve 7, a first switching valve 16, a third switching valve 18, a cold water return valve 25, a sixth switching valve 21, an eighth switching valve 23, and a first water source heat pump unit water valve 13-5;

closed valve: a hot water switching valve 6, a second switching valve 17, a fourth switching valve 19, a fifth switching valve 20, a seventh switching valve 22, and a hot water return valve 26.

The refrigeration cycle comprises heat exchange between the cold and heat source system A and the heat circulation system B, and heat exchange between the heat circulation system B and the user system C.

Wherein, the heat exchange between the cold and heat source system A and the heat circulation system B comprises: the exhaust steam of the steam turbine 1 is condensed by the condenser 2 to release heat. The heat released by the condenser 2 is taken away by the circulating cooling water. A second output end 2-3 of the condenser 2 is connected with a water feeding port of the cooling water tower 3 through a pipeline; the water outlet of the cooling water tower 3 is connected with a cooling water pool 4; the cooling water pool 4 is connected with the inlet of a circulating water pump 5; the outlet of the circulating water pump 5 is divided into two paths: one path is connected with a second input end 2-4 of the condenser 2; the other path is connected with a cold water switching valve 7. The heat released by the condenser 2 and the water source heat pump system is taken away by circulating cooling water, exchanges heat with air in the cooling water tower 3 and is released to the atmospheric environment to form a cooling cycle. The cooling water of the water source heat pump enters the input header pipe 33 through the cold water switching valve 7, flows to the first water dividing collector 8 through the first water inlet 8-1, flows out from the first water outlet 8-2, is sent to the condenser 13-2 of the first water source heat pump 13 through the first switching valve 16, takes away the condensation heat of the heat circulation system B, then passes through the hot water output pipe 29 and the third switching valve 18 to the second water inlet 9-3, then passes through the third water outlet 9-1 and the cold water return valve 25, is sent to the input end of the cooling water tower 3, and exchanges heat with the air through the cooling water tower 3 to form a cooling circulation.

The heat exchange between the heat cycle system B and the user system C comprises the following steps: after the tail-end circulating water flows out from the cold and hot users, the fourth water inlet 10-1 flows into the third water dividing collector 10, flows into the evaporator 13-4 of the first water source heat pump machine 13 through the fifth water outlet 10-3 to release heat, flows to the fourth water dividing collector 11 through the eighth switching valve 23, flows back to the cold and hot users through the sixth water outlet 11-1 of the fourth water dividing collector 11, and the circulation is completed.

The air conditioning system based on the circulating water of the power plant has the following beneficial effects:

the circulating water of the power plant is combined with the air conditioning system through a heat pump technology, waste heat of circulating cooling water of the power plant is fully recovered, comprehensive energy utilization efficiency is improved, carbon emission is reduced, and the influence of the waste heat of the power plant on the ecological environment is reduced.

The system has the advantages of low energy consumption, high enrichment degree, reduction of occupied area of a central air-conditioning system, easiness in implementation, completion of a refrigeration cycle and a heating cycle through one water source heat pump machine, and realization of the function of one machine with multiple purposes.

And a central automatic control system is arranged, so that the temperature, the pressure and the flow can be monitored in real time, automatic control can be performed according to the temperature, loading and unloading of the unit, switching of the operation mode and adjustment of variable flow are realized, chain alarm and shutdown are realized for the conditions of over-temperature, over-pressure and the like, the comfort level of heat supply and cold supply is fully ensured, and the energy consumption is saved to the maximum extent.

The foregoing is directed to the preferred embodiment of the present invention, and it is understood that various changes and modifications may be made by one skilled in the art without departing from the spirit of the invention, and it is intended that such changes and modifications be considered as within the scope of the invention.