Cooling tower high efficiency heat recovery system

Abstract

A high-efficiency heat recovery system for cooling towers comprises a cooling tower group exhaust heat circulation water path, a primary hot water extraction path, and a water source heat pump circulation water path, including the cooling tower itself. The system is characterized in that the cooling tower group exhaust heat circulation water path starts from the cooling tower's liquid receiving pan, passes through the exhaust heat circulation pump, the hot end of the pre-exchange heat exchanger, and then through the water source heat pump evaporator, returning to the cooling tower group's spray heads; the primary hot water extraction path starts from the cold water inlet, passes through the cold end of the pre-exchange heat exchanger, and connects to the inlet of the insulated hot water tank; the water source heat pump circulation water path starts from the circulation outlet of the insulated water tank, passes through the heat extraction circulation pump, passes through the water source heat pump condenser, and ends at the circulation inlet of the insulated water tank; the exhaust heat circulation water path includes at least a hot water pipe section, a cooling water pipe section, and a cooling water pipe section; the primary hot water extraction path includes at least a cold water pipe section and a primary temperature water pipe section; and the water source heat pump circulation water path includes at least a medium temperature water pipe section and a hot water pipe section. The system achieves efficient recovery and utilization of cooling tower waste heat through secondary heat recovery.

Description

Technical Field

[0001] This utility model relates to manufacturing enterprises and buildings that install cooling towers, such as those in ammonia refrigeration systems, pharmaceutical industries, food industries, and hotels with central air conditioning. When refrigeration equipment and central air conditioning systems operate, they discharge waste heat into the atmosphere, resulting in heat waste and air pollution. This invention utilizes a water source heat pump unit evaporator to recover a portion of the heat discharged from conventional cooling towers, producing industrial or domestic hot water, thereby reducing the workload of the cooling tower and achieving energy conservation and emission reduction. This system belongs to the field of low-temperature heat recovery and utilization technology. Background Technology

[0002] Refrigeration technology is becoming increasingly widespread and mature. However, some problems have arisen in its market application, such as:

[0003] (1) Building or factory central air conditioning often only focuses on the cooling process. The heat generated by the process needs to be dissipated by a heat dissipation system, which not only has high operating costs, but also causes heat pollution in summer and wastes water resources.

[0004] (2) Existing industrial ammonia refrigeration systems experience high cooling tower loads and high compressor operating pressures during summer cooling, resulting in low refrigeration efficiency ratios. This is especially true in humid southern regions.

[0005] (3) The pharmaceutical industry, cold drink companies and food processing companies need to use hot water for ingredient preparation, but the low-quality heat generated during the production process is discharged into the atmosphere through cooling towers, causing waste and thermal pollution.

[0006] (4) Hotel bathing requires the production of hot water, but the waste heat generated by the central air conditioning is discharged into the atmosphere through the cooling tower, causing waste and thermal pollution.

[0007] In 2010, the applicant of this invention filed a utility model patent for a "waste heat collection device for ammonia refrigeration system" (ZL201020124930.5), the purpose of which was to collect heat from the cooling water in the cooling tower through a water source heat pump. Although the principle of this device is reasonable, its energy efficiency is low.

[0008] This utility model improves upon the existing design by introducing a new process: cold water is initially heated by exchanging heat with the carrier water before being injected into an insulated water tank. The water in the tank is then circulated by a water source heat pump to draw heat from the cooled carrier water for secondary heating. This system offers high thermal efficiency in hot water production and a significant reduction in the temperature of the carrier water.

[0009] To the best of the applicant's knowledge, no such device has yet appeared or been used on the market, nor has any similar documented or patented. Summary of the Invention

[0010] A two-stage heat recovery system for producing hot water from low-temperature hot water in a cooling tower is installed. The process is as follows: Low-temperature hot water is drawn from the cooling tower's liquid receiving basin by a heat exchanger pump, where it exchanges heat with cold water in a pre-heat exchanger. After passing through a water source heat pump evaporator to release heat, it returns to the cooling tower spray heads. Cold water undergoes preliminary heating in the pre-heat exchanger and is then injected into an insulated hot water tank until it is full. Medium-temperature water is drawn from the insulated tank by a heat recovery pump pump, heated by a water source heat pump condenser, and then returned to the insulated tank. This cycle is repeated until the water temperature in the tank reaches a set value, at which point the system shuts down. The hot water produced in the insulated tank is delivered to the point of use. After the tank is emptied, it is refilled and put back into operation. This system enables efficient recovery and utilization of waste heat from the cooling tower.

[0011] The technical solution of this utility model is as follows:

[0012] A high-efficiency heat recovery system for cooling towers comprises a cooling tower group heat exhaust circulation water circuit including 1-8 cooling towers, a primary heat extraction water circuit, and a water source heat pump circulation water circuit. The system is characterized in that the cooling tower group heat exhaust circulation water circuit starts from the cooling tower's liquid receiving pan, passes through the heat exhaust circulation pump, the hot end of the pre-heat exchanger, and then through the water source heat pump evaporator, returning to the cooling tower group's spray head; the primary heat extraction water circuit starts from the cold water inlet, passes through the cold end of the pre-heat exchanger, and connects to the inlet of the insulated hot water tank; the water source heat pump circulation water circuit starts from the circulation outlet of the insulated water tank, passes through the heat extraction circulation pump, passes through the water source heat pump condenser, and ends at the circulation inlet of the insulated water tank; the heat exhaust circulation water circuit includes at least a hot water pipe section, a cooling water pipe section, and a cooling water pipe section; the primary heat extraction water circuit includes at least a cold water pipe section and a primary temperature water pipe section; and the water source heat pump circulation water circuit includes at least a medium temperature water pipe section and a hot water pipe section.

[0013] The present invention is further characterized in that: 1 to 8 heat exchangers are allowed to be installed in the front, and if there is more than 1 heat exchanger, the heat exchangers are installed in parallel.

[0014] The present invention is further characterized in that: 1 to 18 water source heat pumps are allowed to be installed. When more than one water source heat pump is installed, the water source side is connected in parallel. The heating side is allowed to be connected in either series or parallel, or a combination of series and parallel methods is also allowed.

[0015] The present invention is further characterized in that: the water source heat pump allows the use of cascade units.

[0016] The present invention is further characterized in that: when the cooling tower group includes multiple cooling towers, each equipment heat-carrying branch pipe section is allowed to be connected to the heat-carrying main pipe section in one of two ways, either in series or in parallel, or both in series and in parallel are allowed to be connected to the heat-carrying main pipe section at the same time.

[0017] The present invention is further characterized by allowing for an increase in the number of circulating pumps, the number of insulated water tanks, and the number of equipment cross-lines in the heat exhaust circulation pipeline, the primary heat extraction pipeline, and the water source heat pump circulation pipeline.

[0018] The present invention is further characterized in that it allows the connection of functional components such as pipe fittings, valves, filters, shock absorbers, expansion tanks, drain outlets, insulation facilities, flow meters, heating elements, temperature measuring elements, pressure measuring elements, frequency converters, automatic control systems, and monitoring devices into the heat exhaust circulation pipeline, the primary heat extraction pipeline, and the water source heat pump circulation pipeline.

[0019] The beneficial effects of this utility model are:

[0020] (1) To recover and utilize part or all of the heat discharged from the cooling tower at low cost, so as to achieve the goal of energy conservation and emission reduction.

[0021] (2) High operating COP value reduces cooling tower water loss and fan power consumption.

[0022] (3) For the refrigeration system, the compressor operating conditions are significantly improved in summer, reducing power consumption and power consumption. Attached Figure Description

[0023] Appendix Figure 1 Process flow of a high-efficiency heat recovery system with a single heat exchanger and a single water source heat pump cooling tower.

[0024] Appendix Figure 2 Process flow of a high-efficiency heat recovery system with two heat exchangers and a single water source heat pump cooling tower.

[0025] Appendix Figure 3 A high-efficiency heat recovery system process involving a single heat exchanger, two water source heat pumps, and a parallel cooling tower at the heating end.

[0026] Appendix Figure 4 A high-efficiency heat recovery system process consisting of a single heat exchanger, two water source heat pumps connected in series at the heating end, and a cooling tower.

[0027] Appendix Figure 5 The process of a high-efficiency heat recovery system for a single heat exchanger and four water source heat pumps, with the heating ends connected in pairs in series and then in parallel, using a cooling tower.

[0028] Appendix Figure 6 The process of a high-efficiency heat recovery system for a cooling tower consists of two heat exchangers and four water source heat pumps, with the heating ends connected in parallel in pairs and then in series.

[0029] In the picture:

[0030] 1. Main cold water pipe; 2. Cold water outlet branch pipe

[0031] 2. Main inlet water pipe 2.1. Branch inlet water pipe

[0032] 3. Insulated water tank inlet

[0033] 4.2 Medium-temperature water main pipe; 4.2 Medium-temperature water outlet branch pipe

[0034] 5. Hot water main pipe 5.1 Hot water inlet branch pipes

[0035] 6. Main hot water pipe; 6.1 Inlet branch pipe; 6.2 Outlet branch pipe

[0036] 7. Cooling water main pipe 7.1 Cooling water inlet branch pipe 7.2 Cooling water outlet branch pipe

[0037] 8. Cooling water main pipe 8.1 Cooling water inlet branch pipe 8.2 Cooling water outlet branch pipe

[0038] 9. Intermediate heat pipe; 9.1. Front branch of heat pipe; 9.2. Rear branch of heat pipe.

[0039] 10. Heat exchanger; 11. Heat collection circulation pump; 12. Heat exhaust circulation pump

[0040] 13. Liquid receiving tray; 14. Spray head; 20. Insulated water tank

[0041] 30. Water source heat pump; 31. Evaporator; 32. Condenser Detailed Implementation

[0042] The design principle of this system is to draw hot water from the liquid receiving tray of one or more cooling towers as a heat source, and heat the cold water to a set temperature through a two-stage heating process. The hot water in the tank is then delivered to the point of use as needed. The specific process is as follows:

[0043] A heat exhaust circulation loop is set up, starting from the cooling tower's liquid receiving pan, passing through the heat exhaust circulation pump, the hot end of the preceding heat exchanger, then through the water source heat pump evaporator, and returning to the cooling tower group's spray heads. A water source heat pump circulation water circuit is set up, starting from the insulated water tank's circulation outlet, passing through the heat collection circulation pump, through the water source heat pump condenser, and ending at the insulated water tank's circulation inlet. A primary heat collection water circuit is set up, starting from the cold water inlet, passing through the cold end of the preceding heat exchanger, and entering the insulated water tank through the inlet of the insulated hot water tank.

[0044] The heat exhaust circulation loop is equipped with one pre-exchange heat exchanger, or multiple heat exchangers can be connected in parallel, with a maximum of eight units. The hot end inlet of the pre-exchange heat exchanger is connected to the outlet of the heat exhaust circulation pump via a hot water pipe, and the hot end outlet is connected to the inlet of the water source heat pump evaporator via a cooling water pipe; the inlet of the heat exhaust circulation pump is connected to the cooling tower's liquid receiving tray via a hot water pipe; and the outlet of the water source heat pump evaporator is connected to the cooling tower's spray nozzle via a cooling water pipe.

[0045] Multiple cooling towers form a cooling tower group, corresponding to multiple liquid receiving trays and spray heads. The outlets of multiple liquid receiving trays are connected in parallel to the inlet of the heat exhaust circulation pump; the inlets of multiple spray heads are connected in parallel to the hot end outlet of the preheater.

[0046] In the case of multiple pre-exchange heat exchangers, all equipment is connected in parallel. The cold end inlet is connected in parallel to the cold water inlet, and the cold end outlet is connected in parallel to the inlet of the insulated water tank; the hot end inlet is connected in parallel to the outlet of the heat exhaust circulation pump, and the hot end outlet is connected in parallel to the inlet of the water source heat pump evaporator.

[0047] In the case of multiple water source heat pumps, all evaporators on one side can be connected in parallel, while the condensers on the other side can be connected in series, in parallel, or in a mixed series-parallel configuration (either parallel first and then series, or series first and then parallel).

[0048] A water source heat pump circulation circuit is set up, wherein the outlet of the insulated water tank is connected to the inlet of the heat pump circulation pump through a medium-temperature water pipe, the outlet of the heat pump circulation pump is connected to the inlet of the water source heat pump condenser through a medium-temperature water pipe, and the return water outlet of the insulated water tank is connected to the outlet of the water source heat pump condenser through a hot water pipe.

[0049] In the case of multiple water source heat pumps, the inlets of the condensers of each water source heat pump can be connected in parallel to the outlet of the heat circulation pump, or in series to the outlet of the heat circulation pump, or they can be connected in a mixed manner to the outlet of the heat circulation pump; the outlets of the condensers of each water source heat pump can be connected in parallel to the return inlet of the insulated water tank, or in series to the return inlet of the insulated water tank, or they can be connected in a mixed manner to the return inlet of the insulated water tank.

[0050] A primary hot water supply circuit is set up, starting from the cold water inlet, and connected to the cold end inlet of the heat exchanger in front of the cold water pipe. The cold end outlet of the heat exchanger in front of the heat exchanger is connected to the water inlet of the insulated hot water tank through the primary temperature water pipe.

[0051] When multiple preheater exchanges coexist, they are all connected in parallel. The cold end inlet of each preheater exchanger is connected in parallel and then connected to the cold water inlet; the cold end outlet of each preheater exchanger is connected in parallel and then connected to the water inlet of the insulated water tank.

[0052] The specific embodiments of this utility model will be described below with reference to specific examples.

[0053] All embodiments of the cooling tower assembly are illustrated as three cooling towers connected in parallel. This corresponds to three liquid collection trays and three spray heads. Components unrelated to the cooling towers are not described.

[0054] Example 1: Flowchart of a high-efficiency heat recovery system for a single heat exchanger and a single water source heat pump cooling tower. (See attached diagram) Figure 1 .

[0055] Appendix Figure 1 This is a typical high-efficiency heat recovery system process for a cooling tower. It consists of one pre-exchange heat exchanger and one water source heat pump unit. The process is extremely simple.

[0056] The outlets of the three liquid receiving trays 13 are connected in parallel via heat transfer water branch pipes 6.1 and converge into the heat transfer main pipe 6, which is connected to the heat exhaust circulation pump 12. The heat transfer main pipe 6 is also connected to the hot end inlet of the preceding heat exchanger 10. The hot end outlet of the preceding heat exchanger 10 is connected to the inlet of the evaporator 31 of the water source heat pump 30 via the cooling water main pipe 7. The three spray heads 14 of the cooling tower assembly are connected to the cooling water main pipe 8 via three cooling water branch pipes 8.2, which are then connected to the outlet of the evaporator 31. This equipment constitutes the heat exhaust circulation water circuit.

[0057] The circulating water outlet of the insulated water tank 20 is connected to the inlet of the heat source circulation pump via the medium-temperature water main pipe 4. The outlet of the heat source circulation pump is connected to the inlet of the condenser 32 of the water source heat pump 30 via the medium-temperature water main pipe 4. The outlet of the condenser 32 is connected to the return water outlet of the insulated water tank 20 via the hot water main pipe 5. The above equipment constitutes the water source heat pump circulating water circuit.

[0058] The cold water main pipe 1 is connected to the cold end inlet of the preheater 10, and the cold end outlet of the preheater 10 is connected to the water inlet 3 of the insulated water tank 20 through the primary temperature water main pipe 2, thus forming the primary hot water intake circuit.

[0059] During operation, cold water exchanges heat with hot water in the preheater 10 and then enters the insulated water tank 20, stopping when full. The cold water is heated to an initial temperature. The waste heat circulation circuit draws warm water from the cooling tower group's liquid receiving pan 13 via the waste heat circulation pump 12, exchanges heat with cold water in the preheater 10, and the warm water becomes cooled water. The cooled water enters the evaporator 31 of the water source heat pump 30, is heated by the heat pump, and becomes cooling water, returning to the cooling tower group's spray heads 14 to spray and cool the heat-carrying fluid entering the cooling tower group. The medium-temperature water in the insulated water tank 20 is drawn by the heat recovery circulation pump 11 and heated by the condenser 32 of the water source heat pump 30 to become hot water, returning to the insulated water tank 20. Through continuous circulation, the water temperature in the tank rises to a set value, at which point the water source heat pump circulation circuit stops operating. The hot water is sent to the point of use, the insulated water tank 20 is emptied, and then refilled and heated. This continuous operation achieves efficient recovery of waste heat from the cooling tower.

[0060] The principle of heat pump heating is well known: it can efficiently recover heat from a low-temperature heat source to produce hot water. Therefore, it will not be elaborated upon here.

[0061] This process not only recovers and utilizes the waste heat of the cooling tower group, but also reduces the cooling water temperature and improves the operating conditions of the cooling tower.

[0062] Example 2: Flowchart of a high-efficiency heat recovery system for a single water source heat pump cooling tower with two heat exchangers. (See attached diagram) Figure 2 .

[0063] Appendix Figure 2 The diagram shows a system with two heat exchangers connected in parallel. This solution is adopted when one heat exchanger cannot meet the process load requirements, or when a spare heat exchanger is needed.

[0064] The difference between this system and Embodiment 1 is that two preheater heat exchangers are connected in parallel. The main hot water pipe 6 splits into two after the heat dissipation circulation pump 12, with each branch pipe (6.2) leading to the hot end inlet of one of the two preheater heat exchangers 10. The hot end outlets of the two preheater heat exchangers 10 are connected to the cooling water branch pipes 7.1, which then merge into the cooling water main pipe 7, and finally connect to the evaporator 31 inlet of the water source heat pump 30. The main cold water pipe 1 splits into two, with each branch pipe (1.2) leading to the cold end inlet of one of the preheater heat exchangers 10. The cold end outlets of the two preheater heat exchangers 10 are connected to the initial temperature water branch pipes 2.1, which then merge into the initial temperature water main pipe 2, and finally connect to the water inlet 3 of the insulated water tank 20. Everything else is exactly the same as in Embodiment 1.

[0065] During system operation, the difference from Embodiment 1 is as follows: after the hot water flows through the heat dissipation circulation pump 12, it is split and flows through two parallel preheater heat exchangers 10 to exchange heat with the cold water before converging and entering the inlet of the evaporator 31 of the water source heat pump 30; the cold water is split and flows through two parallel preheater heat exchangers 10 to exchange heat with the hot water before converging and entering the insulated water tank 20 through the water inlet 3. The rest of the operation is exactly the same as in Embodiment 1.

[0066] Three or more front-end heat exchangers can be connected in parallel, and so on.

[0067] Example 3: Flowchart of a high-efficiency heat recovery system with a single heat exchanger, two water source heat pumps connected in parallel at the heating end, and a cooling tower. (See attached diagram) Figure 3 .

[0068] Appendix Figure 2 The diagram shows a system with two water source heat pumps connected in parallel. This solution is adopted when one water source heat pump cannot meet the process load requirements, or when a standby water source heat pump is needed.

[0069] The difference between this system and Example 1 is that two water source heat pumps are connected in parallel. The cooling water main 7 is split into two branches, each connected via a cooling water outlet branch 7.2 to the inlet of the evaporator 31 of the two water source heat pumps 30. The outlets of the evaporators 31 of the two water source heat pumps 30 are connected to the cooling water inlet branch 8.1, and then converge into the cooling water main 8, which is then connected to the three spray heads 14 of the cooling tower assembly via the cooling water outlet branch 8.2. The medium-temperature water main 4 after the heat recovery circulation pump 11 is split into two branches, each connected via a medium-temperature water outlet branch 4.2 to the inlet of the condenser 32 of the water source heat pump 30. The outlets of the condensers 32 of the two water source heat pumps 30 are connected to the hot water inlet branch 5.1, and then converge into the hot water main 5, which is then connected to the circulation return port of the insulated water tank 20. Everything else is exactly the same as in Example 1.

[0070] During system operation, the difference from Example 1 is as follows: the cooling water is split and flows out after absorbing heat through the evaporators 31 of the two parallel water source heat pumps 30, and then converges into the three spray heads 14 of the cooling tower group; the medium-temperature water is split and heated through the condensers 32 of the two parallel water source heat pumps 30, and then converges into the insulated water tank 20 through the circulating return port. The rest of the operation is exactly the same as in Example 1.

[0071] Three or more water source heat pumps connected in parallel, and so on.

[0072] Example 4: Flowchart of a high-efficiency heat recovery system with a single heat exchanger, two water source heat pumps connected in series at the heating end, and a cooling tower. (See attached diagram) Figure 4 .

[0073] Appendix Figure 4 The diagram shows a system with two water source heat pumps connected in series at the heating end. This system is used when the process requires a higher product hot water temperature.

[0074] The difference between this system and Example 3 is that the heating ends of two water source heat pumps are connected in series. The medium-temperature water main pipe 4 after the heat collection circulation pump 11 is connected to the inlet of the condenser 32 of the primary water source heat pump 30. The outlet of the condenser 32 of the primary water source heat pump 30 is connected to the inlet of the condenser 32 of the secondary water source heat pump 30 through an intermediate heat pipe 9. The outlet of the condenser 32 of the secondary water source heat pump 30 is then connected to the circulation return port of the insulated water tank 20 through a hot water main pipe 5. Everything else is exactly the same as in Example 3.

[0075] During system operation, the difference from Example 1 is that: medium-temperature water is heated to intermediate hot water by the condenser 32 of the primary water source heat pump 30, and then heated to high-temperature hot water by the condenser 32 of the secondary water source heat pump 30, before entering the insulated water tank 20 through the circulation return port. The rest of the operation is exactly the same as in Example 3.

[0076] Three or more water source heat pumps are connected in series at the heating end, and so on.

[0077] Example 5: A high-efficiency heat recovery system flow chart for a single heat exchanger with four water source heat pumps, connected in series in pairs and then in parallel at the heating ends, and a cooling tower. See attached diagram. Figure 5 .

[0078] This system consists of four heat pumps connected in series and parallel. This approach is used when the process requires a high product hot water temperature and a large heat load.

[0079] This system differs from the parallel superposition of two heat pump circulating water circuits in Example 4. Compared to Example 4, the exhaust heat circulating water circuit is changed from a one-to-two parallel connection to a one-to-four parallel connection; the water source heat pump circulating water circuit is changed from one circuit to two parallel circuits; the primary heat extraction water circuit remains unchanged.

[0080] Compared to Example 4, the operating method differs in that: medium-temperature water is drawn from the insulated water tank 20, divided into two parts, and heated into high-temperature hot water by two water source heat pumps 30 connected in series before returning to the insulated water tank 20. The two-stage water source heat pumps are connected in parallel on the water source side. The hot water flow in the heat dissipation circulation path is doubled; the heating water flow in the heat pump circulation path is doubled. Theoretically, the hot water production is also doubled.

[0081] Compared to Example 4, the water source heat pump circulation circuit can be divided into three, four, or more parts, and so on. Further details will not be provided here.

[0082] Example 6: A high-efficiency heat recovery system flow chart for a cooling tower with two heat exchangers and four water source heat pumps, initially connected in parallel in pairs and then in series. (See attached diagram) Figure 6 .

[0083] This system consists of four heat pumps connected in series and parallel. This approach is used when the process requires a high product hot water temperature and a large heat load.

[0084] This system has two front-end heat exchangers connected in parallel, and the structure and operation of the heat dissipation circulation water circuit are similar to those in Example 2. The difference is that the cooling water main pipe 7 is divided into four cooling water outlet branches 7.2, which are respectively connected to the inlet of the four water source heat pump evaporators 31. The outlets of the four water source heat pump evaporators 31 are respectively connected to four cooling water inlet branches 8.1, which then converge into the cooling water main pipe 8. Its operation is a four-way parallel heat dissipation system.

[0085] Three or more pre-exchange heat exchangers are connected in parallel in this system, and so on.

[0086] This system's water source heat pump circulation circuit is equivalent to the scheme of two heat pump circulation circuits connected in series and superimposed in Example 3. Here, if we consider the two parallel water source heat pumps as a whole, the structure and operation of the heat pump circulation circuit are similar to Example 4.

[0087] The operation of the water source heat pump circulating water circuit is similar to that in Example 4. Medium-temperature water is drawn from the insulated water tank 20 and heated to intermediate hot water by two parallel water source heat pumps 30. This water then converges to the intermediate heat pipe via the front branch pipe 9.1, and then enters the condensers of the two parallel water source heat pumps via the rear branch pipe 9.2. After being heated to high-temperature hot water in the second stage, the water converges to the main hot water pipe 5 via the hot water inlet branch pipe 5.1, and then returns to the insulated water tank 20 via the circulating return port. The heat dissipation circulating water circuits are first connected in parallel and then in series, doubling the hot water exchange flow; the heating water flow of the heat pump circulating water circuit also doubles. Theoretically, the hot water production also doubles.

[0088] An even number of water source heat pumps are first connected in parallel in pairs, then in series in multiple stages, and so on.

[0089] Three or more water source heat pumps can be connected in parallel at the heating end first, then in series in multiple stages, and so on.

[0090] Other types that differ from the six structures mentioned above will not be listed or described individually. In the above embodiments, the water source heat pump can be entirely a cascade generator, or it can partially use a cascade generator.

Claims

1. A high-efficiency heat recovery system for cooling towers, comprising a cooling tower group heat recovery circulation water circuit including 1-8 cooling towers, a primary heat recovery water circuit, and a water source heat pump circulation water circuit, characterized in that the cooling towers... The heat exchange circulation water circuit starts from the cooling tower's liquid receiving pan, passes through the heat exchange circulation pump, the hot end of the preheater, and then through the water source heat pump evaporator, returning to the cooling tower's spray head; the primary hot water circuit starts from the cold water inlet, passes through the cold end of the preheater, and connects to the insulated hot water tank's inlet; the water source heat pump circulation water circuit starts from the insulated water tank's circulation outlet, passes through the heat exchange circulation pump, goes through the water source heat pump condenser, and ends at the insulated water tank's circulation inlet; the heat exchange circulation water circuit includes at least a hot water pipe section, a cooling water pipe section, and a cooling water pipe section; the primary hot water circuit includes at least a cold water pipe section and a primary temperature water pipe section; the water source heat pump circulation water circuit includes at least a medium temperature water pipe section and a hot water pipe section.

2. The high-efficiency heat recovery system for cooling towers according to claim 1, characterized in that 1 to 8 heat exchangers are allowed to be installed in the front, and if there is more than 1 heat exchanger, the heat exchangers are installed in parallel.

3. The high-efficiency heat recovery system for cooling towers according to claim 1, characterized in that: Water source heat pumps are allowed to be installed in numbers from 1 to 18. If more than one water source heat pump is installed, the water source side shall be connected in parallel. The heating side is allowed to be connected in either series or parallel, or a combination of series and parallel connections is also allowed.

4. The high-efficiency heat recovery system for cooling towers according to claim 1, characterized in that: Water source heat pumps are permitted to use cascade units.

5. The high-efficiency heat recovery system for cooling towers according to claim 1, characterized in that: When a cooling tower group contains multiple cooling towers, each equipment's heat-carrying branch pipe section is allowed to be connected to the main heat-carrying pipe section in either series or parallel mode, or both series and parallel modes are allowed to be connected to the main heat-carrying pipe section simultaneously.

6. The high-efficiency heat recovery system for cooling towers according to claim 1, characterized in that: It is permissible to increase the number of circulating pumps, the number of insulated water tanks, and the number of equipment jumpers in the heat exhaust circulation pipeline, the primary heat extraction pipeline, and the water source heat pump circulation pipeline.

7. The high-efficiency heat recovery system for cooling towers according to claim 1, characterized in that: It is permissible to connect the following functional components to the heat exhaust circulation pipeline, primary heat extraction pipeline, and water source heat pump circulation pipeline: pipe fittings, valves, filters, shock absorbers, expansion tanks, drain outlets, insulation facilities, flow meters, heating elements, temperature measuring elements, pressure measuring elements, frequency converters, automatic control systems, and monitoring devices.

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