Water-saving dry-wet combined cooling system for direct air-cooling thermal power generating unit
By introducing a combined dry and wet cooling system into direct air-cooled thermal power units, and combining direct air cooling and wet cooling systems, the problems of high equipment cost, weak wind resistance, and high pressure for winter frost prevention have been solved, achieving the effects of reduced equipment cost, reduced water consumption, and increased power generation.
Patent Information
- Application Number
- CN202520297717.0
- 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
Existing direct air-cooled thermal power units have high equipment costs, weak resistance to strong winds in summer, and high pressure to prevent freezing in winter, and their system configuration is unreasonable.
A water-saving dry-wet combined cooling system is adopted, which combines the direct air cooling system and the wet cooling system. By sharing an air cooling platform, direct air cooling and wet condensers are configured separately. The direct air cooling fan and the wet cooling fan are used for combined cooling. Combined with the vacuum and spray water systems, the system can be operated in parallel.
It reduced the overall cost of equipment and water consumption, improved the unit's ability to withstand strong winds in summer, increased power generation, and ensured safe and economical operation throughout the year.
Smart Images
Figure CN223896615U_ABST
Abstract
Description
Technical Field
[0001] This utility model provides a water-saving dry-wet combined cooling system for direct air-cooled thermal power units, belonging to the field of cooling system technology. Background Technology
[0002] Direct air-cooling systems are a crucial component of thermal power plants. Currently, all operational and under-construction thermal power plant units utilize a single direct air-cooled condenser at the cold end. The air-cooled radiators are located on an air-cooled platform outside the turbine hall. While direct air-cooling systems require no water consumption, they are significantly affected by ambient wind, especially high temperatures and strong winds. Most power plants require peak-load modifications to expand their cooling capacity. However, during winter operation, for anti-freezing purposes, the direct air-cooling system is often oversized, resulting in excessive capacity. Therefore, direct air-cooling systems suffer from high equipment costs, weak resistance to strong winds in summer, and significant anti-freezing pressure in winter.
[0003] Since wet cooling systems have strong resistance to strong winds in summer and high heat exchange efficiency, this utility model proposes a water-saving dry-wet combined cooling system for direct air cooling. Utility Model Content
[0004] To address the problems of high equipment cost, weak resistance to strong winds in summer, and high pressure for antifreeze in winter associated with the use of a single direct air-cooling system in thermal power plants currently under construction and already in operation, this utility model proposes a water-saving dry-wet combined cooling system for direct air-cooled thermal power units. The aim is to combine the advantages of both direct air-cooling and wet cooling systems, thereby reducing the overall equipment cost, saving plant power consumption, improving the unit's resistance to strong winds in summer, and increasing the unit's power generation.
[0005] The technical solution adopted by this utility model is as follows: a water-saving dry and wet combined cooling system for direct air-cooled thermal power units, including an air-cooled platform, at least one set of direct air-cooled condensers and at least one set of wet condensers are provided on the air-cooled platform, a direct air-cooled fan unit is provided on the top of the direct air-cooled radiator of the direct air-cooled condenser, a wet-cooled fan unit is provided on the top of the wet-cooled radiator of the wet condenser, and a vacuum pipe is provided above the direct air-cooled radiator and the wet-cooled radiator;
[0006] The exhaust steam at the tail end of the main steam turbine of the thermal power unit is connected to one end of the main exhaust steam pipe, and the other end of the main exhaust steam pipe is connected to two exhaust steam branch pipes respectively. One exhaust steam branch pipe is connected to the direct air-cooled radiator, and the other exhaust steam branch pipe is connected to the wet-cooled radiator.
[0007] Direct air condensers are also connected to a condensate system, and wet condensers are also connected to a spray water system.
[0008] Valves are installed on the vacuum pipe and the two exhaust branch pipes.
[0009] Furthermore, both exhaust branch pipes are located on the air-cooled platform.
[0010] Furthermore, the vacuum pipe is connected to a vacuum system.
[0011] Furthermore, the direct air condenser is connected to the condensate header and condensate pump via condensate pipes and then into the condensate system.
[0012] Furthermore, the direct air condenser and the wet condenser can share a single vacuum system.
[0013] Furthermore, the spray water system includes a circulating water pipe, a wet-cooled circulating water pump, and a wet-cooled circulating water pump forebay. The circulating water pipe enables the spray water to circulate within the wet-cooled circulating water pump forebay via the wet-cooled circulating water pump.
[0014] Furthermore, valves are installed on the circulating water pipes.
[0015] Furthermore, the air-cooled platform is elevated outside the main turbine room of the thermal power unit.
[0016] Furthermore, the condensate header is located below the air-cooled platform.
[0017] Furthermore, the area of the direct air-cooled radiator is configured to account for at least 50% of the unit's exhaust heat.
[0018] The advantages of this utility model compared to the prior art are as follows: This utility model can combine the advantages of direct air cooling and wet cooling systems. At the same time, considering that the direct air cooling system needs different air cooling configuration scales and turbine cold end heat matching in summer and winter, the design scale of the direct air cooling system is configured according to the winter operating conditions. At the same time, a certain scale of wet cooling system (closed-loop cooling or open-closed-loop cooling) is connected in parallel to ensure that the unit can operate safely and economically under different operating conditions throughout the year. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings:
[0020] Figure 1 This is a schematic diagram of the structure of this utility model;
[0021] In the diagram: 1 is a direct air-cooled radiator, 2 is the main exhaust pipe and valve, 3 is the direct air-cooled fan unit, 4 is the exhaust branch pipe and valve, 5 is the wet-cooled radiator, 6 is the wet-cooled fan unit, 7 is the wet-cooled circulating water pump, 8 is the wet-cooled circulating water pump forebay, 9 is the circulating water pipe and valve, 10 is the air-cooled platform, 11 is the condensate header, 12 is the condensate pipe and valve, 13 is the vacuum pipe and valve, 14 is the condensate pump, 15 is the condensate system, and 16 is the vacuum system. Detailed Implementation
[0022] like Figure 1 As shown, this utility model provides a water-saving dry-wet combined cooling system for direct air-cooled thermal power units, including a direct air-cooling system, a wet cooling system, a condensate system 15, a vacuum system 16, and a spray water system. The direct air-cooling system includes a direct air-cooled radiator 1 of a direct air-cooled condenser, a direct air-cooled fan unit 3, and an air-cooled platform 10. The wet cooling system includes a wet-cooled radiator 5 of a wet condenser, a wet-cooled fan unit 6, and the spray water system includes a wet-cooled circulating water pump 7 and a wet-cooled circulating water pump forebay 8. Figure 1 The direct air-cooled radiator 1 and the wet-cooled radiator 5 are only shown as one set, but multiple sets can also be arranged.
[0023] The wet-cooled radiator 5 and the direct air-cooled radiator 1 share an air-cooled platform 10, which is elevated on the open ground outside the turbine hall. The exhaust heat of the main turbine is cooled by both the wet-cooled radiator 5 and the direct air-cooled radiator 1. The wet-cooled circulating water pump 7 and the wet-cooled circulating water pump forebay 8 can be arranged on or below the air-cooled platform 10. The condensate header 11 is arranged below the air-cooled platform 10.
[0024] The direct air-cooled fan unit 3 is arranged on top of the direct air-cooled radiator 1, which is arranged horizontally or inverted triangularly; the wet-cooled fan unit 6 is arranged on top of the wet-cooled radiator 5, which is arranged horizontally or inclined; the condensate system 15 of the two systems can be shared or not, depending on whether it is an open or closed circulating water system, and the vacuum system 16 can be shared.
[0025] When the thermal power unit is running, the exhaust steam from the tail of the main turbine rises to the height of the air-cooled platform 10 through the main exhaust pipe and valve 2, and is divided into two branches. One branch exhaust steam pipe and valve 4 connect to the direct air-cooled radiator 1, and is cooled by the direct air-cooled fan unit 3 arranged on the top of the direct air-cooled radiator 1. The cooled condensate is connected to the condensate header 11 through the condensate pipe and valve 12, and is sent to the condensate system 15 by the condensate pump 14. Air is sent to the vacuum system 16 at the top of the direct air-cooled radiator 1 through the vacuum pipe and valve 13. The other branch exhaust steam pipe and valve 4 connect to the wet-cooled radiator 5, and is cooled by the wet-cooled fan unit 6 arranged on the top of the wet-cooled radiator 5. The spray water completes a cycle through the circulating water pipe and valve 9, the wet-cooled circulating water pump 7, and the wet-cooled circulating water pump forebay 8. Air is collected at the top of the wet-cooled radiator 5 through the vacuum pipe and valve 13 and sent to the vacuum system 16 of the direct air-cooled radiator.
[0026] In this embodiment, the area of the direct air-cooled radiator 1 is configured according to the winter operating conditions (at least 50% of the unit's exhaust heat). No valves are required on each steam distribution pipe entering the direct air-cooled system; only valves are needed on the exhaust branch pipes. The wet cooling system is configured according to the remaining 50% of the unit's exhaust heat. The wet cooling system can be either an open or closed circulating water system, depending on the actual water surplus of the power plant. The wet cooling system completes one cycle by spraying water through the circulating water pipes and valves 9, the wet cooling circulating water pump 7, and the wet cooling circulating water pump forebay 8, and together with the wet cooling fan unit 6, it completes the cooling of the exhaust heat of the wet cooling system. The direct air-cooled condenser operates year-round, and the wet cooling system can also operate year-round or be adjusted according to the ambient temperature (e.g., operating from May to October each year).
[0027] This invention changes the original single cooling method of the direct air-cooled system by allowing the radiators of the direct air-cooled condenser and the wet cooling system to share a single air-cooling platform 10. It achieves parallel operation of the two cooling systems (dry and wet), reducing total equipment cost, water consumption, and electricity consumption, while increasing power plant output and facilitating operation and management. It is applicable to direct air-cooled thermal power units ranging from 100MW to 1000MW.
[0028] 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.
[0029] 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 direct air-cooled thermal power units, characterized in that: Includes an air-cooled platform (10), on which at least one set of direct air-cooled condensers and at least one set of wet condensers are provided. A direct air-cooled fan unit (3) is provided on the top of the direct air-cooled radiator (1) of the direct air-cooled condenser, and a wet condenser fan unit (6) is provided on the top of the wet condenser (5). A vacuum pipe is provided above the direct air-cooled radiator (1) and the wet condenser (5). The exhaust steam at the tail end of the main steam turbine of the thermal power unit is connected to one end of the main exhaust steam pipe, and the other end of the main exhaust steam pipe is connected to two exhaust steam branch pipes respectively. One exhaust steam branch pipe is connected to the direct air-cooled radiator (1), and the other exhaust steam branch pipe is connected to the wet-cooled radiator (5). The direct air condenser is also connected to a condensate system (15), and the wet condenser is also connected to a spray water system. Valves are installed on the vacuum pipe and the two exhaust branch pipes.
2. The water-saving dry-wet combined cooling system for direct air-cooled thermal power units according to claim 1, characterized in that: Both exhaust branch pipes are located on the air-cooled platform (10).
3. A water-saving dry-wet combined cooling system for direct air-cooled thermal power units according to claim 1, characterized in that: The vacuum pipe is connected to a vacuum system (16).
4. A water-saving dry-wet combined cooling system for direct air-cooled thermal power units according to claim 1, characterized in that: The direct air condenser is connected to the condensate header (11) and condensate pump (14) via a condensate pipeline and then connected to the condensate system (15).
5. A water-saving dry-wet combined cooling system for direct air-cooled thermal power units according to claim 1, characterized in that: Direct air condensers and wet condensers can share a single vacuum system (16).
6. A water-saving dry-wet combined cooling system for direct air-cooled thermal power units according to claim 1, characterized in that: The spray water system includes a circulating water pipe, a wet-cooled circulating water pump (7) and a wet-cooled circulating water pump forebay (8). The circulating water pipe realizes the circulation of spray water in the wet-cooled circulating water pump forebay (8) through the wet-cooled circulating water pump (7).
7. A water-saving dry-wet combined cooling system for direct air-cooled thermal power units according to claim 6, characterized in that: Valves are installed on the circulating water pipeline.
8. A water-saving dry-wet combined cooling system for direct air-cooled thermal power units according to claim 1, characterized in that: The air-cooled platform (10) is located outside the main turbine room of the thermal power unit via an elevated structure.
9. A water-saving dry-wet combined cooling system for direct air-cooled thermal power units according to claim 4, characterized in that: The condensate manifold (11) is located below the air-cooled platform (10).
10. A water-saving dry-wet combined cooling system for direct air-cooled thermal power units according to any one of claims 1-9, characterized in that: The area of the direct air-cooled radiator (1) is configured according to at least 50% of the unit's exhaust heat.