Main and auxiliary engine indirect air cooling system arranged on same tower

Abstract

The utility model relates to the field of electrical equipment, and discloses a main and auxiliary engine indirect air cooling system arranged on the same tower, an indirect cooling tower is a natural ventilation indirect air cooling tower, a cooling sector comprises a main engine cooling sector and an auxiliary engine cooling sector, and the auxiliary engine cooling sector is an independent sector capable of being withdrawn and started and stopped; a plurality of main engine cooling sectors and one or more auxiliary engine cooling sectors are sequentially arranged in the indirect cooling tower along the circumference, a plurality of radiators are arranged at the bottoms of the cooling sectors of the indirect cooling tower, and shutters capable of being automatically adjusted along with the temperature are arranged on the peripheries of the cooling sectors of the indirect cooling tower; the circulating water system comprises a water pipe mother pipe and a cooling sector water pipe system, the water pipe mother pipe is circumferentially arranged along the sector in the indirect cooling tower, the cooling sector water pipe system is communicated with equipment in the cooling sector and the water pipe mother pipe, and each pipeline is provided with a valve; and each system in the circulating water system provides corresponding supporting facilities for the main machine and the auxiliary machine respectively. The main cooling system and the auxiliary cooling system are arranged on the same tower, a mechanical fan is replaced with natural ventilation, and energy conservation and emission reduction can be achieved.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, and more specifically to an indirect air-cooled system for main and auxiliary units arranged in the same tower. Background Technology

[0002] This section is intended to provide background or context for the embodiments of this application as set forth in the claims. The description herein is not intended to imply that it is prior art that has been disclosed, simply because it is included in this section.

[0003] In megawatt-class coal-fired power units, a cooling system is required to provide stable cooling for the main unit (such as the steam turbine) and auxiliary units (such as fans and pump bearings). Traditional solutions often employ a separate tower or system design. In arid regions, air-cooled systems are preferred to save water. However, when the main unit's cooling system uses natural ventilation indirect air-cooled towers (indirect cooling towers) and the auxiliary units' cooling system uses mechanical ventilation cooling towers, there is a waste of space and resources.

[0004] For conventional air-cooled thermal power units, the auxiliary equipment currently uses closed-loop circulating water for cooling via mechanical ventilation cooling towers, with each section equipped with axial flow fans for forced convection. See the appendix for details on the layout of closed-loop mechanical ventilation cooling towers for conventional 1000MW thermal power auxiliary equipment. Figure 1 , Figure 1 Image (a) shows a top view. Figure 1 (b) shows the front view and a partial cross-sectional view. Figure 1 The conventional closed-loop mechanical ventilation cooling tower for auxiliary thermal power plants shown in the figure has multiple independent fan units, which occupy a large amount of space. The fans have prominent energy consumption and noise problems, and the maintenance costs are high. Summary of the Invention

[0005] The purpose of this invention is to provide an indirect air-cooled system for main and auxiliary units arranged in the same tower, which facilitates the use of natural ventilation to replace mechanical fans and can achieve energy conservation and emission reduction.

[0006] This application discloses an indirect air-cooled system for main and auxiliary units arranged in the same tower, including an indirect cooling tower, cooling sectors, and a circulating water system: the indirect cooling tower is a natural ventilation indirect air-cooled cooling tower, the cooling sectors include a main unit cooling sector for cooling the main unit and an auxiliary unit cooling sector for cooling the auxiliary unit, the auxiliary unit cooling sector being a removable and startable independent sector; multiple main unit cooling sectors and one or more auxiliary unit cooling sectors are arranged sequentially along the circumference inside the indirect cooling tower, and multiple radiators are arranged along the circumference of the bottom of the cooling sectors of the indirect cooling tower, the outer periphery of the radiators being provided with louvers that can be automatically adjusted according to temperature;

[0007] The circulating water system includes a main water pipe and a cooling sector water pipe system. The main water pipe is arranged in a circle along the sector inside the indirect cooling tower. The cooling sector water pipe system connects the equipment in the cooling sector with the main water pipe. Valves are provided on each pipe of the main water pipe and the cooling sector water pipe system.

[0008] The circulating water system also includes a main unit and auxiliary unit water pipe system, an auxiliary water pipe system, a water filling and drainage system, and a pressure stabilizing and replenishing water system. The main water pipe, the cooling sector water pipe system, the main unit and auxiliary unit water pipe system, the auxiliary water pipe system, the water filling and drainage system, and the pressure stabilizing and replenishing water system provide corresponding supporting facilities for the main unit and the auxiliary unit, respectively.

[0009] In a preferred embodiment, the valve is an electric butterfly valve.

[0010] In a preferred embodiment, the outer diameter of the radiator laid out along the circumference of the tower base is 150m-160m, and the height of the indirect cooling tower is 205-215m.

[0011] In a preferred embodiment, the number of auxiliary cooling sectors is one-fifth the number of main cooling sectors.

[0012] In a preferred embodiment, the area occupied by one of the auxiliary cooling sectors is smaller than the area occupied by one of the main cooling sectors, and the area occupied by one of the main cooling sectors is smaller than the area occupied by two of the auxiliary cooling sectors.

[0013] In a preferred embodiment, the main water pipe, the cooling sector water pipe system, the main unit and auxiliary unit water pipe system, the auxiliary water pipe system, the water filling and drainage system, and the pressure stabilizing water supply system provide corresponding supporting facilities for the main unit and the auxiliary unit, respectively, including:

[0014] The water pipe header includes a main unit hot water inlet header, an auxiliary unit hot water inlet header, a main unit cold water outlet header, and an auxiliary unit cold water outlet header. The main unit hot water inlet header and the main unit cold water outlet header are used to provide cooling for the main unit, and the auxiliary unit hot water inlet header and the auxiliary unit cold water outlet header are used to provide cooling for the auxiliary unit.

[0015] The cooling sector water pipe system includes a hot water inlet pipe for the main cooling sector, a cold water return pipe for the main cooling sector, a hot water inlet pipe for the auxiliary cooling sector, and a cold water return pipe for the auxiliary cooling sector. The hot water inlet pipe for the main cooling sector connects the equipment in the main cooling sector to the main hot water inlet header. The cold water return pipe for the main cooling sector connects the equipment in the main cooling sector to the main cold water outlet header. The hot water inlet pipe for the auxiliary cooling sector connects the equipment in the auxiliary cooling sector to the auxiliary hot water inlet header. The cold water return pipe for the auxiliary cooling sector connects the equipment in the auxiliary cooling sector to the auxiliary cold water outlet header.

[0016] The main unit and auxiliary unit water pipe system includes a main unit water pipe system and an auxiliary unit water pipe system. The main unit water pipe system connects the main unit to the main unit's hot water inlet header and the main unit's cold water outlet header. The auxiliary unit water pipe system connects the auxiliary unit to the auxiliary unit's hot water inlet header and the auxiliary unit's cold water outlet header.

[0017] The auxiliary water pipe system consists of a bypass pipe and a bypass valve for each main unit or auxiliary unit to allow water to flow directly back to the circulating water system, and an emergency drain pipe that can quickly discharge water.

[0018] The water filling and drainage system includes a water filling pump and a water storage tank. The water filling pump includes a main unit water filling pump for filling the main unit and an auxiliary unit water filling pump for filling the auxiliary unit. The water storage tank includes a main unit water storage tank for storing water in the main unit and an auxiliary unit water storage tank for storing water in the auxiliary unit.

[0019] The pressure stabilizing water supply system includes a water supply pump and an expansion tank. The water supply pump includes a main unit water supply pump for supplying water to the main unit and an auxiliary unit water supply pump for supplying water to the auxiliary unit. The expansion tank includes a main unit high-level expansion tank for the main unit and an auxiliary unit high-level expansion tank for the auxiliary unit.

[0020] In a preferred embodiment, the diameter of the main water pipe is varied according to the needs of water distribution and collection.

[0021] In a preferred embodiment, the bypass pipe and bypass valve are located at the end of one or more branch loops of the water piping system of each main unit or auxiliary unit within the indirect cooling tower.

[0022] In a preferred embodiment, the bypass pipe and bypass valve are located at the end of two branch loops of the water pipe system of each main unit or auxiliary unit within the indirect cooling tower.

[0023] In a preferred embodiment, the branch loop is located within the cooling sector of the indirect cooling tower and connects to the main water pipe.

[0024] In a preferred embodiment, one or more emergency drain pipes are provided in each water pipe system of the main unit or auxiliary unit within the indirect cooling tower.

[0025] In a preferred embodiment, the two emergency drain pipes are respectively installed in the water pipe system of each main unit or auxiliary unit within the indirect cooling tower.

[0026] In a preferred embodiment, the emergency drain pipe connects the cooling sector water pipe system and the water storage tank.

[0027] In a preferred embodiment, each of the main unit cooling sector hot water inlet pipe, the main unit cooling sector cold water return pipe, the auxiliary unit cooling sector hot water inlet pipe, and the auxiliary unit cooling sector cold water return pipe is provided with a drain pipe.

[0028] In a preferred embodiment, the top of the radiator is provided with a connecting pipe, which is connected to the exhaust pipe of each of the cooling sectors, so that the gas is discharged into the atmosphere when the radiator is filled with water.

[0029] In a preferred embodiment, the water filling and drainage system further includes a water filling pipe, a drainage pipe, and valves;

[0030] The water storage tank is located below the ground of the cooling tower. The water filling pipe and valve are used to connect the water storage tank, the water filling pump and the circulating water system. The drainage pipe and valve are used to connect the circulating water system and the drain outlet.

[0031] In a preferred embodiment, the pressure-stabilizing water supply system further includes a connecting pipe, the water supply pump is arranged in a pump pit next to the water storage tank, the expansion tank is located above the radiator in height, and the water supply pump automatically supplies water to the circulating water system through the connecting pipe according to the water level of the expansion tank.

[0032] In a preferred embodiment, demineralized water is used for makeup water.

[0033] In a preferred embodiment, the system further includes a cleaning system that uses demineralized water as rinsing water and a vertical rectangular frame structure as a cleaning device. The cleaning device is positioned on the inner circumference of the radiator, and a set of intelligent cleaning robots capable of real-time, timed, and fixed-point up-and-down cleaning is mounted on the frame.

[0034] In a preferred embodiment, the cleaning robot has gears that can adhere to and climb walls, a nozzle array that can move in a fixed position, and a cleaning function with 60° rotating spray.

[0035] In a preferred embodiment, an auxiliary spray water pump is also provided, which is arranged in a pump pit next to the water storage tank.

[0036] In a preferred embodiment, each 1000MW unit shares a natural draft intercooling tower. Each intercooling tower has a total of 172 cooling triangles, including 155 cooling triangles for the main unit and 17 cooling triangles for the auxiliary unit. The main unit has 10 sectors and the auxiliary unit has 2 sectors. Each unit is equipped with 2×100% main unit water filling pumps and 2×100% auxiliary unit water filling pumps, 2×100% main unit makeup water pumps, 2×50% main unit high-level expansion tanks and 1×100% auxiliary unit high-level expansion tank, and 2×100% auxiliary unit spray water pumps.

[0037] In a preferred embodiment, the pressure-stabilizing water supply system is arranged in the central area of ​​the inner circumference of the indirect cooling tower, and a water storage tank in the water filling and drainage system is arranged around the central area. The auxiliary water storage tank is a single-section structure, while the main unit water storage tank is a multi-section connected structure, forming an overall fan shape in cross-section. The auxiliary water storage tank is located inside the main unit water storage tank. The water filling pump is connected to the water storage tank from a pump pit in the central area. A main water pipe surrounds the main unit water storage tank, and cooling fan zones are located around the main water pipe. The main unit cooling fan zones are arranged side-by-side. The main unit water pipe system is connected to the main water pipe and the main unit outside the indirect cooling tower on one side of one of the main unit cooling sectors; if there is one auxiliary unit cooling sector, the auxiliary unit water pipe system is connected to the main water pipe and the auxiliary unit outside the indirect cooling tower on one side of the auxiliary unit cooling sector; if there are more than one auxiliary unit cooling sector, the auxiliary unit cooling sectors are also connected side by side, and the auxiliary unit water pipe system is connected to the main water pipe and the auxiliary unit outside the indirect cooling tower on one side of one of the auxiliary unit cooling sectors.

[0038] The main differences and effects of the embodiments of the present invention compared with the prior art are as follows:

[0039] It can achieve energy conservation and emission reduction;

[0040] Furthermore, it reduces the footprint, energy consumption and noise, and maintenance costs;

[0041] Furthermore, it facilitates the independent and flexible use of the main unit cooling sector and the auxiliary unit cooling sector.

[0042] It should be understood that, within the scope of this invention, the above-described technical features of this invention and the technical features specifically described below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be described in detail here. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of a closed-loop mechanical ventilation cooling tower for thermal power auxiliary equipment according to an embodiment of the prior art.

[0045] Figure 2 This is a schematic cross-sectional view of an indirect cooling tower according to one embodiment of this application.

[0046] Figure 3 This is a partial structural schematic diagram of the cross-section of an indirect cooling tower according to one embodiment of this application. Figure 3 (a) in the diagram is a schematic diagram of the specific structure of the host cooling sector; Figure 3 (b) is a schematic diagram of the specific structure of the auxiliary cooling sector; Figure 3 (c) is a schematic diagram of a specific part of the water filling and drainage system; Figure 3 (d) in the diagram is a schematic diagram of the specific structure of the expansion tank; Figure 3 (e) in the diagram is a partial structural diagram of the main engine and auxiliary water pipe system.

[0047] Figure 4 This is a schematic diagram of a vertical cross-section of an indirect cooling tower according to one embodiment of this application.

[0048] The labels in each of the attached figures are as follows:

[0049] 1- Fan unit;

[0050] 2-Insulated cooling tower;

[0051] 3-Cooling sectors;

[0052] 301 - Host Cooling Sector;

[0053] 302 - Auxiliary Equipment Cooling Sector;

[0054] 303 - Radiator;

[0055] 304-Venetian blinds;

[0056] 4- Circulating water system;

[0057] 401 - Main water pipe;

[0058] 402 - Cooling sector water piping system;

[0059] 402.1 - Exhaust pipe;

[0060] 403 - Main and auxiliary water piping system;

[0061] 403.1 - Main unit water piping system;

[0062] 403.2 - Auxiliary machine water piping system;

[0063] 404 - Auxiliary water pipe system;

[0064] 404.1 - Bypass pipes and bypass valves;

[0065] 404.2 - Emergency drain pipe;

[0066] 405 - Water filling and drainage system;

[0067] 405.1 - Water filling pump;

[0068] 405.2 - Water storage tank;

[0069] 405.3 - Water-filled pipes;

[0070] 406 - Pressure Stabilizing Water Supply System;

[0071] 406.1 - Water supply pump;

[0072] 406.2 - Expansion tank;

[0073] 407 - Valve. Detailed Implementation

[0074] In the following description, many technical details are presented to help the reader better understand this application. However, those skilled in the art will understand that the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0075] Explanation of some concepts

[0076] Cooling systems for main and auxiliary equipment in thermal power plants: key facilities to ensure the safe operation of power generation equipment. Main equipment cooling often uses circulating water cooling or air cooling systems, and waste heat is discharged through condensers or cooling towers, such as using condensers to cool the steam after the turbine has done work. Auxiliary equipment cooling often uses independent circulating water systems to cool the equipment, such as using water circulation to cool the bearings of fans and pumps.

[0077] Indirect air-cooled systems: These are cooling systems used in thermal power plants. They indirectly transfer heat from steam through circulating water, ensuring the cooling water medium does not directly contact the air. The working principle is as follows: steam heats the circulating water, which is then cooled by air through finned tube radiators surrounding the indirect air-cooled tower, forming a closed loop. Core components include the tower body, radiators, and surface condensers. Advantages include water saving (significantly lower than wet cooling systems), no white fog, and adaptability to drought. However, disadvantages include high initial cost and efficiency issues in high-temperature environments. They are widely used in water-scarce regions.

[0078] Cooling sectors: Cooling sectors are an important component of indirect cooling towers. Each cooling sector includes a radiator (a cooling triangle is a type of radiator), louvers, water pipe system, and valves, etc. Depending on whether it provides cooling for the main unit or the auxiliary unit, it can be divided into main unit cooling sectors and auxiliary unit cooling sectors.

[0079] Cooling triangle: The cooling triangle consists of multiple cooling units. Each cooling unit typically includes heat dissipation tube bundles, tube boxes, support structures, etc. Multiple cooling units form a triangular structure.

[0080] Water filling and drainage system: used to fill the pipes and radiators with water before the air-cooled system is put into operation, and to drain the water from the system when it is shut down or under maintenance.

[0081] Pressure stabilizing and water replenishment system: Used to maintain stable water pressure in the circulating water system and replenish a small amount of water in a timely manner when the water pressure drops, so as to maintain normal water circulation.

[0082] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0083] This application discloses an indirect air-cooled system for main and auxiliary units arranged in the same tower, such as Figure 2 As shown, it includes an indirect cooling tower 2, cooling sector 3, and a circulating water system 4. The indirect cooling tower 2 is a natural ventilation indirect air-cooled cooling tower. The cooling sector 3 includes a main unit cooling sector 301 that provides cooling for the main unit and an auxiliary unit cooling sector 302 that provides cooling for the auxiliary unit. The auxiliary unit cooling sector 302 is an independent sector that can be removed and started / stopped. Multiple main unit cooling sectors 301 and one or more auxiliary unit cooling sectors 302 are arranged sequentially along the circumference inside the indirect cooling tower 2. At the bottom of the cooling sector 3 of the indirect cooling tower 2, there are multiple radiators 303 laid out along the circumference of the bottom of the tower. The outer periphery of the radiator 303 is provided with louvers 304 that can be automatically adjusted according to the temperature.

[0084] Cooling sector 3 is the main heat dissipation area in the indirect air cooling tower 2. The circulating water system 4 provides piping connections to support the operation of the indirect air cooling system. The radiator 303 is mainly used to realize heat exchange between the circulating water and the air. To prevent freezing in winter, louvers 304 are provided around the outer perimeter of the radiator 303. The opening of the louvers 304 can be automatically adjusted according to the outlet water temperature of the tower. In winter, the airflow through the radiator 303 is controlled by adjusting the opening of the louvers 304 to prevent freezing and ensure that the outlet water temperature is not too low, thus preventing the radiator 303 from freezing. In other seasons, the louvers 304 should be in the fully open position.

[0085] The radiators 303 of the main unit and auxiliary unit are integrated into a single natural ventilation indirect cooling tower 2. The newly added auxiliary unit cooling sector 302 in the indirect cooling tower 2 can share the tower body wind pressure gradient with the original main unit cooling sector 301. The tower body wind pressure gradient refers to the rate at which the wind pressure on the tower surface changes with height or position. Compared with the traditional design of separate towers or systems for the main unit and auxiliary unit, this reduces the waste of space and resources, reduces energy consumption and noise, and reduces maintenance costs. The mechanical ventilation cooling tower fan device of the auxiliary unit is completely eliminated, and natural ventilation is used to replace forced convection, which can achieve energy saving and emission reduction. The radiator 303 of the auxiliary unit is divided into independent sector sections, which supports partial withdrawal operation in winter (anti-freeze) and flexible start and stop in summer, so as to facilitate the non-interference between the main unit cooling sector 301 and the auxiliary unit cooling sector 302 and flexible use as needed.

[0086] The circulating water system 4 includes a water pipe main pipe 401 and a cooling sector water pipe system 402. The water pipe main pipe 401 is arranged in a circle along the sector inside the intercooling tower 2. The cooling sector water pipe system 402 connects the equipment in the cooling sector 3 with the water pipe main pipe 401. Each pipe of the water pipe main pipe 401 and the cooling sector water pipe system 402 is equipped with a valve 407.

[0087] The circulating water system 4 also includes a main unit and auxiliary unit water pipe system 403, an auxiliary water pipe system 404, a water filling and drainage system 405, and a pressure stabilizing and replenishing water system 406. The main water pipe 401, the cooling sector water pipe system 402, the main unit and auxiliary unit water pipe system 403, the auxiliary water pipe system 404, the water filling and drainage system 405, and the pressure stabilizing and replenishing water system 406 provide corresponding supporting facilities for the main unit and auxiliary unit, respectively. The circulating water system 4, through a series of devices and pipes, continuously circulates water within the system to achieve the cooling function. The circulating water system 4 in this application provides separate supporting facilities for the auxiliary and main units. Compared to a shared pipe design, this avoids the confusion caused by mixed use and facilitates balanced water management and targeted, rapid adjustments.

[0088] In one embodiment, such as Figure 2As shown, a pressure-stabilizing water supply system 406 is arranged in the central area of ​​the inner circumference of the indirect cooling tower 2. A water storage tank 405.2 in the water filling and drainage system 405 is arranged around the central area. The auxiliary water storage tank 405.2 is a single-section structure, while the main unit water storage tank 405.2 is a multi-section connected structure, forming an overall fan shape in cross-section. The auxiliary water storage tank 405.2 is located inside the main unit water storage tank 405.2. A water filling pump 405.1 connects to the water storage tank 405.2 from the pump pit in the central area. The main unit water storage tank 405.2 is surrounded by a water pipe header 401, and the cooling sector 3 is located around the main unit. Cooling sectors 301 are arranged side-by-side and connected. The main unit water pipe system 403.1 connects to the main unit outside the indirect cooling tower 2 via the main water pipe header 401 on one side of one of the main unit cooling sectors 301. If there is one auxiliary unit cooling sector 302, the auxiliary unit water pipe system 403.2 connects to the auxiliary unit outside the indirect cooling tower 2 via the main water pipe header 401 on one side of the auxiliary unit cooling sector 302. If there are more than one auxiliary unit cooling sector 302, they are also arranged side-by-side and connected, with the auxiliary unit water pipe system 403.2 connecting to the auxiliary unit outside the indirect cooling tower 2 via the main water pipe header 401 on one side of one of the auxiliary unit cooling sectors 302. This arrangement maximizes space utilization while meeting performance requirements. The side-by-side connection of the auxiliary unit cooling sectors 302 facilitates centralized maintenance and management, facilitates connection with auxiliary equipment, and improves cooling efficiency.

[0089] In one embodiment, valve 407 is an electric butterfly valve. Valve 407 facilitates switching operations under different operating conditions.

[0090] In one embodiment, the outer diameter of the radiator 303 arranged along the circumference of the tower base is 150m-160m, and the height of the indirect cooling tower 2 is 205-215m. The outer diameter of the radiator 303 in a conventional main unit indirect cooling tower 2 is approximately 145m-150m, and the height is approximately 195m. Because it integrates the auxiliary cooling sector 302, the outer diameter and height are expanded to achieve the desired performance, but compared to separate tower or separate system designs, it still effectively reduces the floor space required.

[0091] In one embodiment, the number of auxiliary cooling sectors 302 is one-fifth the number of main cooling sectors 301.

[0092] In one embodiment, the area occupied by one auxiliary cooling sector 302 is smaller than the area occupied by one main cooling sector 301, and the area occupied by one main cooling sector 301 is smaller than the area occupied by two auxiliary cooling sectors 302. The area occupied by the auxiliary cooling sector 302 is approximately half the area occupied by the main cooling sector 301.

[0093] In one embodiment, such as Figure 3As shown, the main water pipe 401, cooling sector water pipe system 402, main unit and auxiliary unit water pipe system 403, auxiliary water pipe system 404, water filling and drainage system 405, and pressure stabilizing water supply system 406 provide corresponding supporting facilities for the main unit and auxiliary unit, including:

[0094] The water pipe header 401 includes a hot water inlet header for the main unit, a hot water inlet header for the auxiliary unit, a cold water outlet header for the main unit, and a cold water outlet header for the auxiliary unit. The hot water inlet header for the main unit and the cold water outlet header for the main unit are used to provide cooling for the main unit, and the hot water inlet header for the auxiliary unit and the cold water outlet header for the auxiliary unit are used to provide cooling for the auxiliary unit.

[0095] The cooling sector water pipe system 402 includes a hot water inlet pipe for the main cooling sector, a cold water return pipe for the main cooling sector, a hot water inlet pipe for the auxiliary cooling sector, and a cold water return pipe for the auxiliary cooling sector. The hot water inlet pipe for the main cooling sector connects the equipment in the main cooling sector 301 to the main hot water inlet header. The cold water return pipe for the main cooling sector connects the equipment in the main cooling sector 301 to the main cold water outlet header. The hot water inlet pipe for the auxiliary cooling sector connects the equipment in the auxiliary cooling sector 302 to the auxiliary hot water inlet header. The cold water return pipe for the auxiliary cooling sector connects the equipment in the auxiliary cooling sector 302 to the auxiliary cold water outlet header. Figure 3 (a) is a schematic diagram of the specific structure of the host cooling sector 301. Figure 3 (b) is a schematic diagram of the specific structure of the auxiliary cooling sector 302.

[0096] The main unit and auxiliary unit water pipe system 403 includes the main unit water pipe system 403.1 and the auxiliary unit water pipe system 403.2. The main unit water pipe system 403.1 connects the main unit to the main unit hot water inlet header and the main unit cold water outlet header, and the auxiliary unit water pipe system 403.2 connects the auxiliary unit to the auxiliary unit hot water inlet header and the auxiliary unit cold water outlet header. Figure 3 (c) is a partial structural diagram of the main unit and auxiliary water pipe system 403.

[0097] The inlet header or inlet pipe is used to transport cooled water from the bottom pool of the cooling equipment (such as the cooling tower) to the equipment that needs cooling (such as the condenser, oil cooler, etc.). The return header or return pipe is used to send the circulating water, which has been heated by absorbing heat from the cooling equipment (such as the condenser, oil cooler, etc.), back to the cooling equipment (such as the cooling tower) for cooling. It is further distinguished according to whether it provides cooling for the main machine or the auxiliary machine.

[0098] The auxiliary water pipe system 404 provides each main unit or auxiliary unit with a bypass pipe and bypass valve 404.1 for direct water return to the circulating water system 4, and an emergency drain pipe 404.2 for rapid water discharge; the auxiliary water pipe system 404 makes it easier to adjust the flow mode or water volume in the circulating water system 4 when special needs are required.

[0099] The water filling and drainage system 405 includes a water filling pump 405.1 and a water storage tank 405.2. The water filling pump 405.1 includes a main unit water filling pump for filling the main unit and an auxiliary unit water filling pump for filling the auxiliary unit. The water storage tank 405.2 includes a main unit water storage tank for storing water in the main unit and an auxiliary unit water storage tank for storing water in the auxiliary unit. Figure 3 (d) in the diagram is a schematic diagram of a specific part of the water filling and drainage system.

[0100] The pressure stabilizing water supply system 406 includes a water supply pump 406.1 and an expansion tank 406.2. The water supply pump 406.1 includes a main unit water supply pump for supplying water to the main unit and an auxiliary unit water supply pump for supplying water to the auxiliary unit. The expansion tank 406.2 includes a main unit high-level expansion tank configured for the main unit and an auxiliary unit high-level expansion tank configured for the auxiliary unit. Figure 3 (e) in the diagram is a schematic diagram of the specific structure of the expansion tank 406.2.

[0101] In one embodiment, the diameter of the main water pipe 401 varies according to the needs of water distribution and collection.

[0102] In one embodiment, a bypass pipe and bypass valve 404.1 are located at the end of one or more branch loops of the water piping system within the intercooling tower 2 for each main or auxiliary unit. The bypass pipe and bypass valve 404.1 are generally used for bypass operation during the initial operation of the system in winter.

[0103] In one embodiment, a bypass pipe and a bypass valve 404.1 are provided at the end of two branch loops of the water pipe system of each main unit or auxiliary unit within the intercooling tower 2.

[0104] In one embodiment, the branch loop is located within the cooling sector 3 of the indirect cooling tower 2 and is connected to the main water pipe 401.

[0105] In one embodiment, one or more emergency drain pipes 404.2 are provided in the water piping systems of each main unit or auxiliary unit within the intercooling tower 2. The emergency drain pipe 404.2 is used in cases where immediate water release is required in an emergency.

[0106] In one embodiment, two emergency drain pipes 404.2 are respectively installed in the water pipe system of each main unit or auxiliary unit in the indirect cooling tower 2.

[0107] In one embodiment, the emergency drain pipe 404.2 connects the cooling sector water pipe system 402 and the water storage tank 405.2.

[0108] In one embodiment, each of the main unit cooling sector hot water inlet pipe, the main unit cooling sector cold water return pipe, the auxiliary unit cooling sector hot water inlet pipe, and the auxiliary unit cooling sector cold water return pipe is provided with a drain pipe.

[0109] In one embodiment, a connecting pipe is provided on the top of the radiator 303, and the connecting pipe is connected to the exhaust pipe 402.1 of each cooling sector 3. When the radiator 303 is filled with water, the gas is discharged into the atmosphere to improve the heat dissipation performance.

[0110] In one embodiment, the water filling and drainage system 405 further includes a water filling pipe 405.3, a drainage pipe, and a valve 407;

[0111] Water storage tank 405.2 is located underground in the cooling tower 2. Water filling pipe 405.3 and valve 407 connect water storage tank 405.2, water filling pump 405.1, and circulating water system 4. Drainage pipe and valve 407 connect circulating water system 4 to the drain outlet. The drainage pipe generally has a similar diameter to water filling pipe 405.3 and is located close to it; it is not shown in the diagram.

[0112] Figure 4 This is a schematic elevation sectional view of the indirect cooling tower 2 according to one embodiment of this application. The positions of the exhaust pipe and the water storage tank 405.2 can be seen. The exhaust pipe extends to approximately 49m above the ground inside the tower, and the water storage tank 405.2 extends to approximately 35m below the ground inside the tower. The ground is paved with thick gravel.

[0113] In one embodiment, the pressure stabilizing water supply system 406 further includes a connecting pipe, and a water supply pump 406.1 is arranged in a pump pit next to the water storage tank 405.2. The expansion tank 406.2 is located above the radiator 303 in height. The water supply pump 406.1 automatically supplies water to the circulating water system 4 through the connecting pipe according to the water level of the expansion tank 406.2.

[0114] In one embodiment, demineralized water is used for makeup water to prevent scaling.

[0115] Because thermal power air-cooled units are mostly located in dry northern regions with harsh climates and frequent sandstorms, radiators 303 are easily contaminated by sand and dust. Therefore, each air-cooled tower 2 is equipped with a cleaning system (not shown in the figure). The cleaning system can clean the dust and dirt deposited between the fins of radiator 303 and maintain the good heat dissipation performance of radiator 303.

[0116] In one embodiment, a cleaning system is also included. The cleaning system uses demineralized water as rinsing water and adopts a vertical rectangular frame structure as a cleaning device. The cleaning device is erected on the inner circumference of the radiator 303, and an intelligent cleaning robot that can perform real-time timed and fixed-point up-and-down cleaning is configured on the frame.

[0117] In one embodiment, the cleaning device is a single unit that moves throughout the cooling tower 2. In another embodiment, the cleaning robot has gears that can adhere to and climb walls, a nozzle array that can move in a fixed position, and a cleaning function with 60° rotating spray. Because the auxiliary system is designed to operate at temperatures not exceeding 44°C and not exceeding 38°C in summer (35°C), cooling measures such as spraying and misting (if necessary) are required when the ambient temperature exceeds 35°C.

[0118] In one embodiment, an auxiliary spray water pump (not shown in the figure) is also provided, which is arranged in a pump pit next to the water storage tank 405.2. The spray uses demineralized water, which can be drawn directly from the demineralized water supply pipe outside the tower and sprayed around the auxiliary air-cooled radiator 303 to reduce the ambient temperature around the auxiliary air-cooled radiator 303 through evaporative cooling.

[0119] The design of having the water supply pump 406.1, the water filling pump 405.1, and the auxiliary spray water pump all located in the pump pit will facilitate centralized water adjustment and maintenance.

[0120] In one embodiment, a single 1000MW unit shares a natural ventilation intercooling tower 2, with a total of 172 cooling triangles per tower 2, including 155 cooling triangles for the main unit and 17 cooling triangles for the auxiliary unit. The main unit has 10 sectors and the auxiliary unit has 2 sectors. Each unit is equipped with 2×100% main unit water filling pumps and 2×100% auxiliary unit water filling pumps, 2×100% main unit water replenishment pumps, 2×50% main unit high-level expansion tanks and 1×100% auxiliary unit high-level expansion tank, and 2×100% auxiliary unit spray water pumps.

[0121] The "100%" in "2×100% main unit water supply pumps" means that each main unit is equipped with two water supply pumps. The flow rate of a single pump can meet the entire water supply and pressure stabilization system of the main unit under the design conditions. That is, each pump has the ability to independently undertake 100% water supply tasks of the main unit system. When the two pumps work at the same time, they can provide twice the water supply capacity. This design is for redundancy and backup considerations to improve the reliability of the system. When one pump fails, the other pump can still ensure the normal water supply of the main unit system.

[0122] The "50%" in "2×50% main unit high-level expansion tanks" refers to two main unit high-level expansion tanks. Each tank's volume is 50% of the maximum expansion volume of the entire main unit's water system under design conditions due to factors such as temperature changes. The two tanks work together to fully accommodate the expansion of the main unit's water volume. Using two 50% capacity tanks instead of one larger tank is for considerations such as space layout, system maintenance convenience, and cost. It also provides redundancy; if one tank malfunctions, the other can still handle some of the expansion regulation.

[0123] The "100%" in "1×100% Auxiliary High-Level Expansion Tank" means that the volume of the auxiliary high-level expansion tank can meet all the expansion requirements of the entire auxiliary water system under the design conditions. That is, it can fully accommodate the maximum change in water volume caused by thermal expansion and contraction during the operation of the auxiliary system, without the need for other expansion tanks 406.2, and independently undertake the expansion regulation function of the auxiliary system.

[0124] Comparative Example 1

[0125] Currently, the auxiliary cooling of conventional 1000MW-class air-cooled thermal power units uses mechanical ventilation cooling towers, which occupy a large area (approximately 60m×35m in plan size, and no ground buildings can be placed within a certain range around them), have high fan energy consumption (132kW per fan, 1584kW for 2 units with 12 fans), annual operating electricity costs of approximately 1.76 million yuan (based on the cost of electricity generation), and generate significant noise.

[0126] This application discloses an indirect air-cooled system for main and auxiliary units arranged in the same tower. This system allows a single 1000MW unit to share a natural draft indirect cooling tower 2, adding two auxiliary unit cooling sectors 302. The outer diameter of the bottom radiator 303 is expanded from approximately 145-150m in a conventional main unit indirect cooling tower 2 to 156m, and the tower height is increased from approximately 195m to 210m. A single indirect cooling tower 2 has a total of 172 cooling triangles. The main unit occupies 155 cooling triangles, and the auxiliary units occupy 17 cooling triangles, totaling 10 main unit cooling sectors 301 and 2 auxiliary unit cooling sectors 302. This technical solution has the following advantages:

[0127] 1) Energy saving and consumption reduction: The auxiliary mechanical ventilation cooling tower fan group (132kW×12 units / 2×1000MW units) was eliminated, and the energy consumption approached zero, saving an average of about 1.76 million yuan in electricity costs per year.

[0128] 2) Optimized floor space: Integrating the main and auxiliary systems saves 2160m² of space occupied by the mechanical ventilation cooling tower. 2 / 2×1000MW units, reducing road and pipeline construction costs.

[0129] 3) Noise reduction and reliability: Natural ventilation replaces mechanical fans, reducing factory noise by 30 dB(A), reducing rotating equipment, and shortening equipment failure links.

[0130] 4) Economic efficiency throughout the entire life cycle: The initial investment increases by about 30 million yuan, but the annual operating cost decreases by 1.76 million yuan. The maintenance and repair costs are calculated separately. The static payback period is about 17 years, which also has environmental benefits.

[0131] It should be noted that in the claims and specification of this patent, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0132] All documents mentioned in this invention are incorporated herein by reference as if each document were individually incorporated by reference. Furthermore, it should be understood that after reading the foregoing teachings of this invention, those skilled in the art can make various alterations or modifications to this invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A main and auxiliary unit indirect air-cooling system arranged in the same tower, characterized in that, The system includes an indirect cooling tower (2), cooling sectors (3), and a circulating water system (4): the indirect cooling tower (2) is a natural ventilation indirect air-cooled cooling tower; the cooling sector (3) includes a main unit cooling sector (301) that provides cooling for the main unit and an auxiliary unit cooling sector (302) that provides cooling for the auxiliary unit; the auxiliary unit cooling sector (302) is an independent sector that can be removed and started / stopped; multiple main unit cooling sectors (301) and one or more auxiliary unit cooling sectors (302) are arranged sequentially along the circumference inside the indirect cooling tower (2); the bottom of the cooling sector (3) of the indirect cooling tower (2) has multiple radiators (303) laid out along the circumference of the bottom of the tower; the outer periphery of the radiator (303) is provided with louvers (304) that can be automatically adjusted according to the temperature. The circulating water system (4) includes a main water pipe (401) and a cooling sector water pipe system (402). The main water pipe (401) is arranged in a circle along the sector inside the intercooling tower (2). The cooling sector water pipe system (402) connects the equipment in the cooling sector (3) and the main water pipe (401). Each pipe of the main water pipe (401) and the cooling sector water pipe system (402) is equipped with a valve (407). The circulating water system (4) also includes a main unit auxiliary water pipe system (403), an auxiliary water pipe system (404), a water filling and drainage system (405), and a pressure stabilizing water supply system (406). The main water pipe (401), the cooling sector water pipe system (402), the main unit auxiliary water pipe system (403), the auxiliary water pipe system (404), the water filling and drainage system (405), and the pressure stabilizing water supply system (406) provide corresponding supporting facilities for the main unit and the auxiliary unit, respectively.

2. The main and auxiliary machine indirect air-cooling system according to claim 1, characterized in that, The outer diameter of the radiator (303) laid out along the circumference of the bottom of the tower is 150m-160m, and the height of the indirect cooling tower (2) is 205-215m.

3. The main and auxiliary machine indirect air-cooling system according to claim 1, characterized in that, The number of auxiliary cooling sectors (302) is one-fifth the number of main cooling sectors (301).

4. The main and auxiliary machine indirect air-cooling system according to claim 1, characterized in that, The area occupied by one of the auxiliary cooling sectors (302) is smaller than the area occupied by one of the main cooling sectors (301), and the area occupied by one of the main cooling sectors (301) is smaller than the area occupied by two of the auxiliary cooling sectors (302).

5. The main and auxiliary machine indirect air-cooling system according to claim 1, characterized in that, The main water pipe (401), the cooling sector water pipe system (402), the main unit and auxiliary unit water pipe system (403), the auxiliary water pipe system (404), the water filling and drainage system (405), and the pressure stabilizing water supply system (406) provide corresponding supporting facilities for the main unit and the auxiliary unit, respectively: The water pipe header (401) includes a hot water inlet header for the main unit, a hot water inlet header for the auxiliary unit, a cold water outlet header for the main unit, and a cold water outlet header for the auxiliary unit. The hot water inlet header for the main unit and the cold water outlet header for the main unit are used to provide cooling for the main unit, and the hot water inlet header for the auxiliary unit and the cold water outlet header for the auxiliary unit are used to provide cooling for the auxiliary unit. The cooling sector water pipe system (402) includes a hot water inlet pipe for the main cooling sector, a cold water return pipe for the main cooling sector, a hot water inlet pipe for the auxiliary cooling sector, and a cold water return pipe for the auxiliary cooling sector. The hot water inlet pipe for the main cooling sector connects the equipment in the main cooling sector (301) to the main hot water inlet header. The cold water return pipe for the main cooling sector connects the equipment in the main cooling sector (301) to the main cold water outlet header. The hot water inlet pipe for the auxiliary cooling sector connects the equipment in the auxiliary cooling sector (302) to the auxiliary hot water inlet header. The cold water return pipe for the auxiliary cooling sector connects the equipment in the auxiliary cooling sector (302) to the auxiliary cold water outlet header. The main unit and auxiliary unit water pipe system (403) includes a main unit water pipe system (403.1) and an auxiliary unit water pipe system (403.2). The main unit water pipe system (403.1) connects the main unit to the main unit's hot water inlet header and the main unit's cold water outlet header. The auxiliary unit water pipe system (403.2) connects the auxiliary unit to the auxiliary unit's hot water inlet header and the auxiliary unit's cold water outlet header. The auxiliary water pipe system (404) is provided for each main unit or auxiliary unit to have a bypass pipe and bypass valve (404.1) for direct water return to the circulating water system (4), and an emergency drain pipe (404.2) for rapid water discharge. The water filling and drainage system (405) includes a water filling pump (405.1) and a water storage tank (405.2). The water filling pump (405.1) includes a main unit water filling pump for filling the main unit and an auxiliary unit water filling pump for filling the auxiliary unit. The water storage tank (405.2) includes a main unit water storage tank for storing water in the main unit and an auxiliary unit water storage tank for storing water in the auxiliary unit. The pressure stabilizing water supply system (406) includes a water supply pump (406.1) and an expansion tank (406.2). The water supply pump (406.1) includes a main unit water supply pump for supplying water to the main unit and an auxiliary unit water supply pump for supplying water to the auxiliary unit. The expansion tank (406.2) includes a main unit high-level expansion tank configured for the main unit and an auxiliary unit high-level expansion tank configured for the auxiliary unit.

6. The main and auxiliary machine indirect air-cooling system according to claim 5, characterized in that, The water filling and drainage system (405) also includes a water filling pipe (405.3), a drainage pipe, and a valve (407); The water storage tank (405.2) is arranged under the ground of the cooling tower (2). The water filling pipe (405.3) and valve (407) are used to connect the water storage tank (405.2), the water filling pump (405.1) and the circulating water system (4). The drainage pipe and valve (407) are used to connect the circulating water system (4) and the drain outlet.

7. The main and auxiliary machine indirect air-cooling system according to claim 5, characterized in that, The pressure stabilizing water supply system (406) also includes a connecting pipe. The water supply pump (406.1) is arranged in a pump pit next to the water storage tank (405.2). The expansion tank (406.2) is located above the radiator (303) in height. The water supply pump (406.1) automatically supplies water to the circulating water system (4) through the connecting pipe according to the water level of the expansion tank (406.2).

8. The indirect air-cooled system for main and auxiliary machines according to claim 1, characterized in that, It also includes a cleaning system, which uses demineralized water as rinsing water and adopts a vertical rectangular frame structure as a cleaning device. The cleaning device is located on the inner circumference of the radiator (303), and a set of intelligent cleaning robots that can perform real-time timed and fixed-point up-and-down cleaning are configured on the frame.

9. The main and auxiliary machine indirect air-cooling system according to claim 8, characterized in that, The cleaning robot is equipped with gears that can adhere to and climb walls, a nozzle array that can move in a fixed position, and a cleaning function with 60° rotating spray.

10. The main and auxiliary machine indirect air-cooling system according to claim 1, characterized in that, It also has an auxiliary spray water pump, which is located in the pump pit next to the water storage tank (405.2).

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