Water-saving dry-wet combined cooling system for auxiliary engine system of thermal power generating unit
By adopting a combined dry and wet cooling system in the auxiliary equipment system of thermal power plants, and combining the alternating arrangement of air-cooled radiators and wet-cooled radiators with a spray water system, the problem of high water and electricity consumption of wet cooling systems has been solved, achieving the effect of water and electricity saving.
Patent Information
- Application Number
- CN202520297716.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-24
AI Technical Summary
The existing wet cooling system of auxiliary equipment in thermal power plants consumes a lot of water and electricity, and has poor safety issues.
A combined dry and wet cooling system is adopted, which alternately arranges air-cooled radiators and wet radiators in the air-cooled cooling tower under natural ventilation, combined with a spray water system, to achieve combined dry and wet cooling of the auxiliary machine circulating water, and uses an expansion tank for pressure stabilization.
It reduced the plant's electricity and water consumption, and improved the system's safety and operating efficiency.
Smart Images
Figure CN223896610U_ABST
Abstract
Description
Technical Field
[0001] This utility model provides a water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units, belonging to the field of cooling system technology. Background Technology
[0002] Auxiliary equipment systems are an important part of thermal power plants. Currently, the auxiliary equipment cooling systems of thermal power plants that have been put into operation or are under construction usually adopt wet cooling systems. There are two main types of wet cooling systems: open-loop cooling systems and closed-loop cooling systems. They are located on top of the auxiliary equipment circulating water pumps and consume a lot of water throughout the year, especially in summer. Therefore, adopting a wet cooling system alone has the problems of high water consumption and high plant power consumption.
[0003] Therefore, considering the safety of auxiliary machine operation, saving plant power and water consumption, the heat of the circulating water in the auxiliary machine system is cooled by setting up a natural ventilation cooling tower and arranging radiators in the wet condenser around the tower. Utility Model Content
[0004] To address the problems of poor safety and high water and electricity consumption in existing wet cooling systems used in auxiliary equipment systems of thermal power plants, this invention proposes a water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units.
[0005] The technical solution adopted by this utility model is as follows: a water-saving dry and wet combined cooling system for auxiliary equipment systems of thermal power units, including an auxiliary cooler and a natural ventilation indirect air-cooled cooling tower, an auxiliary circulating water pipe is provided between the auxiliary cooler and the natural ventilation indirect air-cooled cooling tower, an auxiliary circulating water pump is provided on the auxiliary circulating water pipe, air-cooled radiator segments and wet-cooled radiator segments are alternately arranged in the natural ventilation indirect air-cooled cooling tower, and a spray water system is also arranged in the natural ventilation indirect air-cooled cooling tower. The spray water system includes spray pipes, and spray pipes are provided inside each wet-cooled radiator segment. Multiple nozzles are provided on the spray pipes.
[0006] An expansion tank is also installed in the natural ventilation indirect air-cooled cooling tower to regulate the pressure stability of the auxiliary system;
[0007] The auxiliary machine circulating water pipeline includes a main inlet pipe and a main return pipe located outside the natural ventilation indirect air-cooled cooling tower, and four branch pipes located inside the natural ventilation indirect air-cooled cooling tower. Two of the branch pipes are used to realize the water circulation of the air-cooled radiator fan section, and the other two branch pipes are used to realize the water circulation of the wet-cooled radiator fan section. The air-cooled radiator fan section is also connected to the return water pipe on the wet-cooled radiator fan section, so as to realize the complete circulation of auxiliary machine circulating water between the air-cooled radiator fan section, the wet-cooled radiator fan section, and the auxiliary machine cooler.
[0008] Furthermore, the inlet and outlet of the expansion tank are connected to one of the branch pipes of the air-cooled radiator fan section and the wet-cooled radiator fan section, respectively.
[0009] Furthermore, the spray water system also includes a spray water tank, a spray circulating water pipe and a spray circulating water pump installed in the natural ventilation indirect air-cooled cooling tower. One end of the spray circulating water pipe is connected to the spray water tank, and the other end of the spray circulating water pipe is arranged around the inner side of the air-cooled radiator fan segment and the wet-cooled radiator fan segment. The spray pipe corresponding to each wet-cooled radiator fan segment is connected to the spray circulating water pipe.
[0010] Furthermore, each air-cooled radiator segment and wet-cooled radiator segment is connected to a branch pipe via a corresponding branch pipe, and each branch pipe is equipped with a valve.
[0011] Furthermore, each air-cooled radiator fan segment and wet-cooled radiator fan segment is equipped with a valve.
[0012] Furthermore, the area of the air-cooled radiator is configured to handle at least 50% of the auxiliary machine exhaust heat during winter operation.
[0013] Furthermore, both the air-cooled radiator fan segments and the wet-cooled radiator fan segments are arranged on an elevated platform inside the natural ventilation indirect air-cooled cooling tower, and are arranged vertically, horizontally, or inclined around the natural ventilation indirect air-cooled cooling tower.
[0014] The advantages of this utility model compared to the prior art are as follows: Considering the purpose of saving plant power and water, the auxiliary machine cooling system of this utility model adopts a cooling method of indirect air cooling and wet condenser. The radiators of the air condenser and the wet condenser share a natural ventilation indirect air cooling tower. The cooling fan sections of the air condenser and the wet condenser are arranged alternately or at intervals in the indirect cooling tower, realizing the dry and wet combined series operation of the two cooling systems. This not only reduces plant power consumption, but also saves a lot of water. Attached Figure Description
[0015] The present invention will be further described below with reference to the accompanying drawings:
[0016] Figure 1 This is a schematic diagram of the structure of this utility model;
[0017] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;
[0018] In the diagram: 1 is the auxiliary machine cooler, 2 is the auxiliary machine circulating water pipe and valve, 3 is the auxiliary machine circulating water pump, 4 is the natural ventilation indirect air-cooled cooling tower, 5 is the expansion tank, 6 is the air-cooled radiator fan section, 7 is the wet-cooled radiator fan section, 8 is the spray circulating water pump, 9 is the spray circulating water pipe and valve, 10 is the spray pipe, and 11 is the spray water tank. Detailed Implementation
[0019] like Figure 1 and 2 As shown, this utility model provides a water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units, including an auxiliary cooler 1. The auxiliary circulating water is connected in series with the air-cooled radiator fan section 6 and the wet-cooled radiator fan section 7 in a natural draft indirect air-cooled cooling tower 4 through the auxiliary cooler 1, auxiliary circulating water pipes and valves 2, and auxiliary circulating water pump 3. In this embodiment, the auxiliary circulating water pump 3 can be arranged in the natural draft indirect air-cooled cooling tower 4. The radiators of the air-cooled condenser and the wet-cooled condenser share a natural draft indirect air-cooled cooling tower 4. The cooling fan sections of the air-cooled condenser and the wet-cooled condenser are arranged alternately or at intervals in the tower to realize the dry-wet combined series operation of the two cooling systems. Figure 1 The number of fan segments 6 in the hollow-core radiator is shown for illustration.
[0020] The natural draft indirect air-cooled cooling tower 4 is also equipped with a spray circulating water pump 8, spray circulating water pipes and valves 9, spray pipes 10 and spray water tank 11. The spray circulating water pipes and valves 9 are connected to the spray water tank 11. The other end of the spray circulating water pipes is arranged in a circle around the wet radiator fan section 7 inside the natural draft indirect air-cooled cooling tower 4, and a spray pipe 10 is installed on the inner side of each wet radiator fan section 7 (i.e. the side closer to the center of the tower). Each spray pipe 10 is connected to the spray circulating water pipes and valves 9, and each spray pipe 10 is equipped with multiple nozzles.
[0021] The water in the spray water tank 11 completes a spray water cycle through the spray circulating water pump 8, the spray circulating water pipe and valve 9, and the spray pipe 10. The spray water is sprayed from the inside to the outside of the tower through the spray pipe 10 on the inner side of the surface of the wet cooling radiator inside the tower.
[0022] The air-cooled radiator fan segment 6 and the wet-cooled radiator fan segment 7 are arranged vertically around the natural ventilation indirect air-cooled cooling tower 4, or they can be arranged horizontally or at a small angle on the elevated platform inside the natural ventilation indirect air-cooled cooling tower 4; the auxiliary system uses an expansion tank 5 for pressure stabilization and regulation, and the expansion tank 5 is placed inside the tower.
[0023] Four auxiliary machine circulating water pipes are installed in the natural ventilation indirect air-cooled cooling tower 4. Two pipes are used to connect to the air-cooled radiator fan section 6 to achieve circulation, and the other two pipes are used to connect to the wet-cooled radiator fan section 7 to achieve circulation. In this embodiment, the air-cooled radiator fan section 6 also needs to be connected to the return water pipe on the wet-cooled radiator fan section 7 to achieve complete circulation of auxiliary machine circulating water between the air-cooled radiator fan section 6, the wet-cooled radiator fan section 7, and the auxiliary machine cooler 1.
[0024] The area of the air-cooled radiator is configured according to the winter operating conditions (at least 50% of the auxiliary machine exhaust heat), and the wet cooling system is configured according to the remaining 50% of the auxiliary machine exhaust heat.
[0025] The principle of this utility model is as follows: the exhaust steam of the auxiliary machine system enters its respective auxiliary machine cooler 1. The exhaust steam cooling adopts a combined dry and wet cooling method of indirect air cooling system and wet cooling system in series. The auxiliary machine circulating water enters the auxiliary machine cooler 1 through the auxiliary machine circulating water pipe and valve 2, auxiliary machine circulating water pump 3, air-cooled radiator fan section 6, and wet cooling radiator fan section 7, forming a closed loop. The spray water completes one spray water loop through the spray circulating water pump 8, spray circulating water pipe and valve 9, and nozzle 10. During winter operation, the wet cooling radiator fan section 7 entering the wet condenser in the tower is closed, allowing the circulating water to enter the air-cooled radiator fan section 6 in the tower for cooling. During other seasons, the wet cooling radiator fan section 7 entering the tower is opened, allowing the circulating water to first enter the air-cooled radiator fan section 6 in the tower for cooling, and then enter the wet cooling radiator fan section 7 for cooling. The two cooling systems operate in series.
[0026] This utility model's auxiliary cooling system employs a combined cooling method of indirect air cooling and wet condenser. The radiators of both the air-cooled and wet condensers share a single natural draft indirect air-cooled cooling tower 4, changing the single cooling method of the auxiliary unit and achieving combined dry and wet operation of the two cooling systems in series. The auxiliary system is pressure-stabilized through an expansion tank 5, reducing water and electricity consumption and facilitating operation and management. It is suitable for 100MW to 1000MW thermal power units.
[0027] Regarding the specific structure of this utility model, it should be noted that the connection relationships between the various component modules adopted in this utility model are definite and achievable. Except as specifically described in the embodiments, their specific connection relationships can bring about corresponding technical effects and solve the technical problems proposed by this utility model without relying on the execution of corresponding software programs. The models of the components, modules, and specific components appearing in this utility model, the connection methods between them, and the conventional usage methods and expected technical effects brought about by the above-mentioned technical features, unless specifically described, are all publicly disclosed content in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by those skilled in the art before the application date, or belong to conventional technology, common knowledge, and other existing technologies in this field. There is no need to elaborate, which makes the technical solution provided in this case clear, complete, and achievable, and can reproduce or obtain corresponding physical products based on this technical means.
[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units, characterized in that: It includes an auxiliary machine cooler (1) and a natural ventilation indirect air-cooled cooling tower (4). An auxiliary machine circulating water pipe is provided between the auxiliary machine cooler (1) and the natural ventilation indirect air-cooled cooling tower (4). An auxiliary machine circulating water pump (3) is provided on the auxiliary machine circulating water pipe. Air-cooled radiator fan sections (6) and wet-cooled radiator fan sections (7) are alternately arranged in the natural ventilation indirect air-cooled cooling tower (4). A spray water system is also arranged in the natural ventilation indirect air-cooled cooling tower (4). The spray water system includes a spray pipe (10). A spray pipe (10) is provided inside each wet-cooled radiator fan section (7). Multiple nozzles are provided on the spray pipe (10). An expansion tank (5) for regulating the pressure stability of the auxiliary system is also installed in the natural ventilation indirect air-cooled cooling tower (4). The auxiliary machine circulating water pipeline includes an inlet main pipe and a return main pipe arranged outside the natural ventilation indirect air-cooled cooling tower (4), and four branch pipes arranged inside the natural ventilation indirect air-cooled cooling tower (4). Two of the branch pipes are used to realize the water circulation of the air-cooled radiator fan section (6), and the other two branch pipes are used to realize the water circulation of the wet-cooled radiator fan section (7). The air-cooled radiator fan section (6) is also connected to the return water pipe on the wet-cooled radiator fan section (7) to realize the complete circulation of auxiliary machine circulating water between the air-cooled radiator fan section (6), the wet-cooled radiator fan section (7), and the auxiliary machine cooler (1).
2. The water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units according to claim 1, characterized in that: The inlet and outlet of the expansion tank (5) are connected to one of the branch pipes of the air-cooled radiator segment (6) and the wet-cooled radiator segment (7), respectively.
3. A water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units according to claim 2, characterized in that: The spray water system also includes a spray water tank (11), a spray circulating water pipe and a spray circulating water pump (8) installed in the natural ventilation indirect air-cooled cooling tower (4). One end of the spray circulating water pipe is connected to the spray water tank (11), and the other end of the spray circulating water pipe is arranged around the inner side of the air-cooled radiator fan section (6) and the wet-cooled radiator fan section (7). The spray pipe (10) corresponding to each wet-cooled radiator fan section (7) is connected to the spray circulating water pipe.
4. A water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units according to claim 1, characterized in that: Each air-cooled radiator segment (6) and wet-cooled radiator segment (7) is connected to the branch pipe through the corresponding branch pipe, and each branch pipe is equipped with a valve.
5. A water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units according to claim 4, characterized in that: Each air-cooled radiator segment (6) and wet-cooled radiator segment (7) is equipped with a valve.
6. A water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units according to any one of claims 1-5, characterized in that: The area of the air-cooled radiator is configured to account for at least 50% of the exhaust heat of the auxiliary equipment under winter operating conditions.
7. A water-saving dry-wet combined cooling system for auxiliary equipment systems of thermal power units according to any one of claims 1-5, characterized in that: The air-cooled radiator fan section (6) and the wet-cooled radiator fan section (7) are both arranged on the elevated platform inside the natural ventilation indirect air-cooled cooling tower (4), and are arranged vertically, horizontally or inclined around the natural ventilation indirect air-cooled cooling tower (4).