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

Abstract

The invention 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an auxiliary engine cooling sector, and the auxiliary engine cooling sector is an independent sector capable of being withdrawn and started and stopped; a plurality of main engine cooling sectors and one or more auxiliary engine cooling sectors are sequentially arranged in the indirect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] The present invention relates to the technical field of electrical equipment, and more particularly to an indirect air cooling system for main and auxiliary machines arranged on the same tower. Background Art

[0002] This section aims to provide background or context for the embodiments of the present application described in the claims. The description herein is not admitted to be prior art that has been publicly disclosed merely by including it in this section.

[0003] In a million-kilowatt coal-fired unit, a cooling system is required to provide stable cooling for the main machine (such as a steam turbine) and auxiliary machines (such as fans and pump bearings). Traditional solutions mostly adopt a split-tower or split-system design. In arid regions, an air cooling system is preferentially adopted to save water. However, when a natural draft indirect air cooling tower (intercooling tower) for the cooling of the main machine coexists with a mechanical draft cooling tower for the cooling of the auxiliary machines, there is a waste of site and resources.

[0004] For a conventional thermal power air cooling unit, at present, the closed-circuit circulating water of the auxiliary machine dissipates heat through a mechanical draft cooling tower, and an axial flow fan is configured for each section to force convection. For the layout of a conventional 1000MW thermal power auxiliary machine closed-circuit mechanical draft cooling tower, see Figure 1 , Figure 1 The top view is shown in (a) of Figure 1 The front view and partial sectional view are shown in (b) of Figure 1 A number of independent fan devices are provided in the conventional thermal power auxiliary machine closed-circuit mechanical draft cooling tower shown in Summary of the Invention

[0005] The object of the present invention is an indirect air cooling system for main and auxiliary machines arranged on the same tower, which is convenient to use natural ventilation to replace mechanical fans and can achieve energy conservation and emission reduction.

[0006] The present application discloses an indirect air cooling system for main and auxiliary machines arranged on the same tower, including an intercooling tower, a cooling sector and a circulating water system: the intercooling tower is a natural draft indirect air cooling tower, the cooling sector includes a main machine cooling sector for cooling the main machine and an auxiliary machine cooling sector for cooling the auxiliary machine, and the auxiliary machine cooling sector is an independent fan section that can be withdrawn and started and stopped; a plurality of the main machine cooling sectors and one or more of the auxiliary machine cooling sectors are arranged in sequence along the circumference inside the intercooling tower, there are a plurality of radiators laid along the circumference of the tower bottom at the bottom of the cooling sector of the intercooling tower, and adjustable louvers that can be automatically adjusted according to the temperature are provided on the outer periphery of the radiators;

[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 sectors inside the indirect cooling tower. The cooling sector water pipe system connects the equipment in the cooling sectors and the main water pipe. Valves are provided on each pipeline of the main water pipe and the cooling sector water pipe system;

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

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

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

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

[0012] In a preferred example, the area occupied by one cooling sector for the auxiliary equipment is less than the area occupied by one cooling sector for the main equipment, and the area occupied by one cooling sector for the main equipment is less than the area occupied by two cooling sectors for the auxiliary equipment.

[0013] In a preferred example, the main water pipe, the cooling sector water pipe system, the main and auxiliary equipment water pipe system, the auxiliary water pipe system, the water filling and drainage system, and the pressure stabilizing and water replenishing system respectively providing corresponding supporting facilities for the main equipment and the auxiliary equipment includes:

[0014] The main water pipe includes a main equipment hot water inlet main pipe, an auxiliary equipment hot water inlet main pipe, a main equipment cold water outlet main pipe, and an auxiliary equipment cold water outlet main pipe. The main equipment hot water inlet main pipe and the main equipment cold water outlet main pipe are used to cool the main equipment, and the auxiliary equipment hot water inlet main pipe and the auxiliary equipment cold water outlet main pipe are used to cool the auxiliary equipment;

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

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

[0017] The auxiliary water pipe system is provided with a bypass pipe and a bypass valve for each main or auxiliary engine to directly return water to the circulating water system, and an emergency drain pipe capable of quickly discharging water;

[0018] The water filling and draining system includes a water filling pump and a water storage tank. The water filling pump includes a main engine water filling pump for filling water into the main engine and an auxiliary engine water filling pump for filling water into the auxiliary engine. The water storage tank includes a main engine water storage tank for storing water for the main engine and an auxiliary engine water storage tank for storing water for the auxiliary engine;

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

[0020] In a preferred example, the diameter of the water pipe header changes according to the needs of water distribution and collection.

[0021] In a preferred example, the bypass pipe and the bypass valve are provided at the end of one or more branch loops of each water pipe system of each main or auxiliary engine in the indirect cooling tower.

[0022] In a preferred example, the bypass pipe and the bypass valve are provided at the ends of two branch loops of each water pipe system of each main or auxiliary engine in the indirect cooling tower.

[0023] In a preferred example, the branch loop is located in the cooling sector of the indirect cooling tower and connects to the water pipe header.

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

[0025] In a preferred embodiment, the two emergency drain water pipes are respectively arranged in the water pipe systems of each main engine or auxiliary engine in the indirect cooling tower.

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

[0027] In a preferred embodiment, one vent pipe is provided for each of the hot water inlet pipe of the main engine cooling sector, the cold water return pipe of the main engine cooling sector, the hot water inlet pipe of the auxiliary engine cooling sector, and the cold water return pipe of the auxiliary engine cooling sector.

[0028] In a preferred embodiment, a connecting pipe is provided at the top of the radiator, and the connecting pipe is connected to the exhaust pipe of each cooling sector to discharge the gas into the atmosphere when the radiator is filled with water.

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

[0030] The water storage tank is arranged underground under the indirect cooling tower. The filling pipe and valves are used to connect the water storage tank, the filling water pump and the circulating water system, and the draining pipe and valves are used to connect the circulating water system and the drain outlet.

[0031] In a preferred embodiment, the voltage stabilizing and water replenishing system further includes a connecting pipe. The water replenishing pump is arranged in a pump pit beside the water storage tank. The expansion tank is located above the radiator in height. The water replenishing pump automatically controls the water replenishment 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 water replenishment.

[0033] In a preferred embodiment, a cleaning system is further included. The cleaning system uses demineralized water as the flushing water and adopts the structural form of a vertical rectangular frame as the cleaning device. The cleaning device stands on the inner circumference of the radiator, and a set of intelligent cleaning robots capable of moving up and down at fixed times and points in real time is configured on the frame.

[0034] In a preferred embodiment, the cleaning robot is equipped with gears capable of adsorbing and climbing walls, a nozzle row capable of moving at fixed points, and a cleaning function with a 60° rotating spray.

[0035] In a preferred embodiment, an auxiliary engine spray water pump is further provided, and the auxiliary engine spray water pump is arranged in a pump pit beside the water storage tank.

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

[0037] In a preferred embodiment, the pressure stabilizing and makeup water system is arranged in the central area of the inner circumference of the indirect cooling tower, and the water storage tank in the water filling and drainage system is arranged around the central area. The auxiliary unit water storage tank is a single-section structure, and the main unit water storage tank is a multi-section connected structure, which is overall in a superior sector shape in cross-section. The auxiliary unit water storage tank is inside the main unit water storage tank. The charging pump is connected from the pump pit in the central area to the water storage tank. The periphery of the main unit water storage tank is a water pipe header, and the periphery of the water pipe header is a cooling sector. The main unit cooling sectors are arranged side by side and connected. The main unit water pipe system communicates the water pipe header 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 communicates the water pipe header 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 sectors, the auxiliary unit cooling sectors are also arranged side by side and connected, and the auxiliary unit water pipe system communicates the water pipe header 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 their effects between the embodiments of the present invention and the prior art are as follows:

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

[0040] Furthermore, it reduces the floor area, lowers energy consumption and noise, and reduces the maintenance cost;

[0041] Furthermore, it is convenient for the main unit cooling sectors and the auxiliary unit cooling sectors to not interfere with each other and be used flexibly.

[0042] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present 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 elaborated one by one here. Description of the Drawings

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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

[0045] Figure 2 It is a schematic cross-sectional view of an indirect cooling tower according to an embodiment of the present application.

[0046] Figure 3 It is a schematic diagram of a partial specific structure of the cross-section of an indirect cooling tower according to an embodiment of the present application. Among them Figure 3 (a) is a schematic diagram of the specific structure of the main machine cooling sector; Figure 3 (b) is a schematic diagram of the specific structure of the auxiliary machine cooling sector; Figure 3 (c) is a schematic diagram of a partial specific structure of the water filling and drainage system; Figure 3 (d) is a schematic diagram of the specific structure of the expansion tank; Figure 3 (e) is a schematic diagram of a partial specific structure of the main and auxiliary machine water pipe system.

[0047] Figure 4 It is a schematic diagram of a longitudinal sectional view of an indirect cooling tower according to an embodiment of the present application.

[0048] In each of the drawings, the various markings are as follows:

[0049] 1 - Fan device;

[0050] 2 - Indirect cooling tower;

[0051] 3 - Cooling sector;

[0052] 301 - Main machine cooling sector;

[0053] 302 - Auxiliary machine cooling sector;

[0054] 303 - Radiator;

[0055] 304 - Louver;

[0056] 4 - Circulating water system;

[0057] 401 - Water pipe header;

[0058] 402 - Cooling sector water pipe system;

[0059] 402.1 - Exhaust pipe;

[0060] 403 - Main and auxiliary engine water pipe systems;

[0061] 403.1 - Main engine water pipe system;

[0062] 403.2 - Auxiliary engine water pipe system;

[0063] 404 - Auxiliary water pipe system;

[0064] 404.1 - Bypass pipe and bypass valve;

[0065] 404.2 - Emergency drain water pipe;

[0066] 405 - Water filling and drainage system;

[0067] 405.1 - Water filling pump;

[0068] 405.2 - Water storage tank;

[0069] 405.3 - Water filling pipeline;

[0070] 406 - Pressure stabilizing and water replenishing system;

[0071] 406.1 - Water replenishing pump;

[0072] 406.2 - Expansion water tank;

[0073] 407 - Valves. Detailed implementation manners

[0074] In the following description, many technical details are provided to help readers better understand the present application. However, those of ordinary skill in the art can understand that the claimed technical solutions of the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0075] Explanation of some concepts

[0076] Main and auxiliary engine cooling systems in thermal power plants: Key facilities to ensure the safe operation of power generation equipment. The main engine is often cooled by a circulating water cooling system or an air cooling system, and waste heat is discharged through a condenser or a cooling tower. For example, a condenser is used to cool the steam after the steam turbine does work. The auxiliary engine is usually cooled by an independent circulating water system to cool the equipment. For example, a water cycle is used to cool the bearings of fans and pumps.

[0077] Indirect air cooling system: A cooling system used in thermal power plants that transfers the heat of steam indirectly through circulating water, and the cooling water medium does not directly contact the air. Its working principle is as follows: After the steam heats the circulating water, the circulating water is cooled by air through the finned tube radiators around the indirect air cooling tower, forming a closed cycle. The core components include the tower body, radiator, and surface condenser, which have the advantages of water conservation (significantly lower than wet cooling systems), no white fog, and adaptability to arid environments, but have the disadvantages of high initial cost and reduced efficiency in high-temperature environments, and are widely used in water-scarce areas.

[0078] Cooling sector: A cooling sector is an important part of an indirect air cooling tower. Each cooling sector includes a radiator (a cooling triangle is a form of radiator), shutters, a water pipe system, valves, etc. It can be divided into a main unit cooling sector and an auxiliary unit cooling sector according to whether it provides cooling for the main unit or the auxiliary unit.

[0079] Cooling triangle: A cooling triangle consists of multiple cooling units. Each cooling unit usually 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 cooling system is put into operation, and drain the water in the system during shutdown and maintenance.

[0081] Voltage stabilizing and make-up water system: Used to maintain the stable water pressure in the circulating water system, and make a small amount of make-up water in time when the water pressure drops to maintain normal water circulation.

[0082] To make the purpose, technical solutions, and advantages of this application clearer, the following will further describe the implementation manners of this application in detail with reference to the accompanying drawings.

[0083] This application discloses a main and auxiliary unit indirect air cooling system with co-located towers, as Figure 2 shown, including an indirect air cooling tower 2, cooling sectors 3, and a circulating water system 4: The indirect air cooling tower 2 is a natural draft indirect air cooling tower. The cooling sectors 3 include 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 fan section that can be withdrawn and started and stopped. A plurality of main unit cooling sectors 301 and one or more auxiliary unit cooling sectors 302 are arranged in sequence along the circumference inside the indirect air cooling tower 2. There are a plurality of radiators 303 laid along the circumference of the bottom of the cooling sectors 3 of the indirect air cooling tower 2, and shutters 304 that can be automatically adjusted according to temperature are provided on the outer periphery of the radiators 303;

[0084] The cooling sector 3 is the main heat dissipation area in the indirect cooling tower 2. The circulating water system 4 provides pipeline connections to support the operation of the indirect air cooling system. The radiator 303 is mainly used to achieve the heat exchange between the circulating water and the air. To avoid freezing in winter, a louver 304 is provided on the outer periphery of the radiator 303. The opening degree of the louver 304 can be automatically adjusted according to the outlet water temperature of the tower. In winter, the air flow passing through the radiator 303 is controlled by adjusting the opening degree of the louver 304 for anti-freezing, ensuring that the outlet water temperature of the tower cannot be too low and preventing the radiator 303 from freezing. In other seasons, the louver 304 should be in the fully open position.

[0085] The radiators 303 of the main machine and the auxiliary machine are integrated into a single natural draft indirect cooling tower 2. The newly added auxiliary machine cooling sector 302 in the indirect cooling tower 2 can share the tower body wind pressure gradient with the original main machine cooling sector 301. The tower body wind pressure gradient refers to the rate of change of the wind pressure on the tower body surface with height or position. Compared with the traditional design in which the main machine and the auxiliary machine are mostly designed in separate towers or separate systems, it reduces the waste of site and resources, reduces energy consumption and noise, and reduces maintenance costs; completely cancels the fan device of the auxiliary machine mechanical ventilation cooling tower, and uses natural ventilation to replace forced convection, which can achieve energy conservation and emission reduction; the radiator 303 of the auxiliary machine is divided into independent fan segments, supporting partial withdrawal operation (anti-freezing) in winter and flexible start-stop in summer, facilitating the non-interference between the main machine cooling sector 301 and the auxiliary machine cooling sector 302 and flexible use according to needs.

[0086] The circulating water system 4 includes a water pipe header 401 and a cooling sector water pipe system 402. The water pipe header 401 is arranged in a circle along the sectors in the indirect cooling tower 2. The cooling sector water pipe system 402 connects the equipment in the cooling sector 3 and the water pipe header 401. Valves 407 are provided on each pipeline of the water pipe header 401 and the cooling sector water pipe system 402;

[0087] The circulating water system 4 further includes a main-auxiliary machine water pipe system 403, an auxiliary water pipe system 404, a water filling and drainage system 405, and a pressure stabilizing and water replenishing system 406. The water pipe header 401, the cooling sector water pipe system 402, the main-auxiliary machine water pipe system 403, the auxiliary water pipe system 404, the water filling and drainage system 405, and the pressure stabilizing and water replenishing system 406 respectively provide corresponding supporting facilities for the main machine and the auxiliary machine. The circulating water system 4 enables water to continuously circulate in the system through a series of equipment and pipelines to achieve the cooling function. The circulating water system 4 in this application provides supporting facilities for the auxiliary machine and the main machine respectively. Compared with the design of sharing pipelines, it can avoid the chaos caused by parallel connection and facilitate the balanced management of water volume and rapid targeted adjustment.

[0088] In one embodiment, as Figure 2As shown in the figure, a pressure stabilizing and make-up water system 406 is arranged in the central area of the inner circumference of the indirect cooling tower 2, and a water storage tank 405.2 in the water filling and drainage system 405 is arranged around the central area. Among them, the auxiliary machine water storage tank 405.2 is of a single-section structure, and the main machine water storage tank 405.2 is of a multi-section connected structure, and is in an excellent fan shape as a whole in the cross section; the auxiliary machine water storage tank 405.2 is inside the main machine water storage tank 405.2; the water filling pump 405.1 is connected from the pump pit in the central area to the water storage tank 405.2; the outer periphery of the main machine water storage tank 405.2 is a water pipe header 401, and the outer periphery of the water pipe header 401 is a cooling sector 3. The main machine cooling sectors 301 are arranged side by side. The main machine water pipe system 403.1 communicates with the water pipe header 401 and the main machine outside the indirect cooling tower 2 on one side of one of the main machine cooling sectors 301; if there is one auxiliary machine cooling sector 302, the auxiliary machine water pipe system 403.2 communicates with the water pipe header 401 and the auxiliary machine outside the indirect cooling tower 2 on one side of the auxiliary machine cooling sector 302; if there is more than one auxiliary machine cooling sector 302, the auxiliary machine cooling sectors 302 are also arranged side by side, and the auxiliary machine water pipe system 403.2 communicates with the water pipe header 401 and the auxiliary machine outside the indirect cooling tower 2 on one side of one of the auxiliary machine cooling sectors 302. Such an arrangement can make the most effective use of space while meeting the performance requirements. The auxiliary machine cooling sectors 302 are arranged side by side, which is convenient for the staff to carry out centralized maintenance and management, convenient for connecting with the auxiliary machine supporting equipment, and improves the cooling efficiency.

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

[0090] In one embodiment, the outer diameter of the radiator 303 laid along the circumference of the tower bottom is 150m - 160m, and the height of the indirect cooling tower 2 is 205 - 215m. The outer diameter of the radiator 303 of the conventional main machine indirect cooling tower 2 is about 145m - 150m, and the height of the conventional main machine indirect cooling tower 2 is about 195m. Due to the integration of the auxiliary machine cooling sector 302, the outer diameter and height are expanded to meet the performance requirements, but compared with the separate tower or separate system design, the floor area is still effectively reduced.

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

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

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

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

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

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

[0097] The inlet header or inlet pipe is used to convey the cooled water in the bottom pool of the cooling equipment (such as a cooling tower) to the equipment that needs to be cooled (such as a condenser, an oil cooler, etc.). The return header or return pipe is used to send the circulating water whose temperature has risen after absorbing heat by the cooling equipment (such as a condenser, an oil cooler, etc.) back to the cooling equipment (such as a cooling tower) for cooling, and it is further distinguished according to whether it provides cooling for the main equipment or the auxiliary equipment.

[0098] The auxiliary water pipe system 404 respectively sets up a bypass pipe and a bypass valve 404.1 for each main or auxiliary equipment to directly return water to the circulating water system 4, and an emergency drain pipe 404.2 that can quickly drain water; the auxiliary water pipe system 404 can more conveniently adjust the flow mode or water volume in the circulating water system 4 when special needs arise.

[0099] The water filling and draining 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 engine water filling pump for filling water for the main engine and an auxiliary engine water filling pump for filling water for the auxiliary engine. The water storage tank 405.2 includes a main engine water storage tank for storing water for the main engine and an auxiliary engine water storage tank for storing water for the auxiliary engine; Figure 3 (d) in it is a schematic diagram of the partial specific structure of the water filling and draining system.

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

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

[0102] In one embodiment, the bypass pipe and bypass valve 404.1 are provided at the end of one or more branch loops of each water pipe system of the main engine or auxiliary engine in the indirect cooling tower 2. 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, the bypass pipe and bypass valve 404.1 are provided at the ends of two branch loops of each water pipe system of the main engine or auxiliary engine in the indirect cooling tower 2.

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

[0105] In one embodiment, one or more emergency drain water pipes 404.2 are provided in each water pipe system of the main engine or auxiliary engine in the indirect cooling tower 2. The emergency drain water pipe 404.2 is used for situations where immediate water discharge is urgently required.

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

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

[0108] In one embodiment, an emptying water pipe is provided for each of the main engine cooling sector hot water inlet pipe, the main engine cooling sector cold water return pipe, the auxiliary engine cooling sector hot water inlet pipe, and the auxiliary engine cooling sector cold water return pipe.

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

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

[0111] The water storage tank 405.2 is arranged underground under the ground of the indirect cooling tower 2. The water filling pipe 405.3 and the valve 407 are used to connect the water storage tank 405.2, the water filling pump 405.1 and the circulating water system 4, and the drain pipe and the valve 407 are used to connect the circulating water system 4 and the drain port. Generally, the drain pipe has a diameter equivalent to that of the water filling pipe 405.3 and is close in position, which is not marked in the figure.

[0112] Figure 4 It is a schematic vertical sectional view of the indirect cooling tower 2 in an embodiment of the present application. The positions of the exhaust pipe and the water storage tank 405.2 can be seen. The exhaust pipe is up to about 49 m above the ground in the tower, and the water storage tank 405.2 is as low as about 35 m above the ground in the tower, and the ground is paved with thick gravel.

[0113] In one embodiment, the pressure stabilizing and water replenishing system 406 further includes a connecting pipe. The makeup water pump 406.1 is arranged in a pump pit beside the water storage tank 405.2, and the expansion tank 406.2 is located above the radiator 303 in height. The makeup water pump 406.1 automatically controls the water replenishment 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, to prevent scaling, desalted water is used for water replenishment.

[0115] Since thermal power air-cooled units are mostly located in dry northern regions with harsh climates and frequent sandstorm weather, the radiator 303 is vulnerable to sand and dust pollution. Therefore, each indirect cooling tower 2 is equipped with a cleaning system (not shown in the figure). The cleaning system can clean the ash and dirt deposited between the fins of the radiator 303 to maintain good heat dissipation performance of the radiator 303.

[0116] In one embodiment, a cleaning system is further included. The cleaning system uses desalted water as the flushing water and adopts a vertical rectangular frame structure type as the cleaning device. The cleaning device stands on the inner circumference of the radiator 303, and a set of intelligent cleaning robots that can move up and down for cleaning at fixed times and fixed points in real time is configured on the frame.

[0117] In one embodiment, the cleaning device is a set, which moves around in the intercooler 2. In one embodiment, the cleaning robot has gears that can climb the wall by suction, a nozzle row that can move at a fixed point, and a cleaning function with a 60° rotating spray. Because the design working condition of the auxiliary system (35°C in summer) requires the inlet water temperature not to exceed 44°C and the outlet water temperature not to exceed 38°C, when the ambient temperature is greater than 35°C, it is necessary to take spraying and showering (if necessary) cooling measures.

[0118] In one embodiment, an auxiliary machine spray water pump (not shown in the figure) is also provided, and the auxiliary machine spray water pump is arranged in a pump pit next to the water storage tank 405.2. Demineralized water is used for spraying, and water can be directly drawn from the demineralized water supply pipe outside the tower and then sprayed around the auxiliary machine air-cooled radiator 303, thereby reducing the ambient temperature around the auxiliary machine air-cooled radiator 303 by evaporative cooling.

[0119] The design that the make-up water pump 406.1, the charging water pump 405.1 and the auxiliary machine spray water pump are all 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, and a single intercooling tower 2 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 a total of 10 sectors, and the auxiliary unit has a total of 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 water tanks and 1×100% auxiliary unit high-level expansion water tanks, and 2×100% auxiliary unit spray water pumps.

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

[0122] The "50%" in "2×50% host high-level expansion water tanks" refers to two host high-level expansion water tanks. The volume of each water tank is 50% of the maximum expansion volume of the entire water system of the host under design conditions due to temperature changes and other factors. The two water tanks work together to fully accommodate the expansion of the water volume of the host system. The use of two 50% capacity water tanks instead of a larger water tank is based on considerations such as space layout, system maintenance convenience or cost. It also provides a certain degree of redundancy. When a water tank has a problem, the other water tank can still take on part of the expansion adjustment function.

[0123] "100%" in "1×1 00% Auxiliary High-level Expansion Water Tank" means that the volume of this auxiliary high-level expansion water tank can meet all the expansion requirements of the entire water system of the auxiliary equipment under the design conditions, that is, it can completely accommodate the maximum change in water volume caused by thermal expansion and contraction during the operation of the auxiliary equipment system without the assistance of other expansion water tanks 406.2, and independently undertakes the expansion adjustment function of the auxiliary equipment system.

[0124] Comparative Example 1

[0125] Currently, the auxiliary equipment cooling of conventional 1000MW thermal power air-cooled units uses mechanical draft cooling towers, which have a large footprint (the plane size is about 60m×35m, and no ground buildings can be arranged within a certain range around), high fan energy consumption (the power of a single fan is 132kW, and 12 fans for 2 units reach 1584kW), an annual operating electricity cost of about 1.76 million yuan (calculated based on the power generation cost electricity price), and high noise.

[0126] In an indirect air-cooling system for main and auxiliary equipment arranged in the same tower in this application, a single 1000MW unit shares a natural draft cooling tower 2, and 2 new auxiliary equipment cooling sectors 302 are added. The outer diameter of the bottom radiator 303 is extended from about 145 - 150m of the conventional main equipment cooling tower 2 to 156m, and the tower height is increased from about 195m of the conventional main equipment cooling tower 2 to 210m. There are a total of 172 cooling triangles in a single cooling tower 2. Among them, the main equipment occupies 155 cooling triangles, the auxiliary equipment occupies 17 cooling triangles, there are a total of 10 main equipment cooling sectors 301, and a total of 2 auxiliary equipment cooling sectors 302. This technical solution has the following advantages:

[0127] 1) Energy conservation and consumption reduction: Cancel the fan group of the auxiliary equipment mechanical draft cooling tower (132kW×12 units / 2×1000MW units), the energy consumption approaches zero, and the annual electricity cost savings are about 1.76 million yuan.

[0128] 2) Occupied land optimization: Integrate the main and auxiliary equipment systems, save the land occupied by the mechanical draft cooling tower 2160m 2 / 2×1000MW units, and reduce the construction costs of roads and pipelines.

[0129] 3) Noise reduction and reliability: Replace mechanical fans with natural ventilation, reduce the plant noise by 30dB(A), reduce rotating equipment, and shorten the equipment failure link.

[0130] 4) Economy in the whole life cycle: The initial investment increases by about 30 million yuan, but the annual operating cost decreases by 1.76 million yuan. The overhaul and maintenance costs are not included. The static payback period is about 17 years, and it also has environmental benefits.

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

[0132] All documents mentioned in this invention are cited herein by reference as if each individual document was cited by reference. In addition, it should be understood that after reading the above teachings of this invention, those skilled in the art can make various changes or modifications to this invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. An indirect air cooling system for main and auxiliary machines arranged in the same tower, characterized in that: The invention comprises an intercooling tower (2), a cooling sector (3) and a circulating water system (4): the intercooling tower (2) is a natural ventilation indirect air cooling tower; the cooling sector (3) comprises a main engine cooling sector (301) for providing cooling for the main engine and an auxiliary engine cooling sector (302) for providing cooling for the auxiliary engine; the auxiliary engine cooling sector (302) is an independent sector that can be withdrawn and started and stopped; a plurality of the main engine cooling sectors (301) and one or more auxiliary engine cooling sectors (302) are sequentially arranged along the circumference of the intercooling tower (2); a plurality of radiators (303) are arranged along the circumference of the bottom of the tower at the bottom of the cooling sector (3) of the intercooling tower (2); and a shutter (304) that can be automatically adjusted according to the temperature is provided on the outer periphery of the radiator (303); The circulating water system (4) comprises a water pipe mother pipe (401) and a cooling sector water pipe system (402), wherein the water pipe mother pipe (401) is arranged in a circle along the sectors in the intercooling tower (2), and the cooling sector water pipe system (402) is connected to the equipment in the cooling sector (3) and the water pipe mother pipe (401), and valves (407) are provided on each pipe of the water pipe mother pipe (401) and the cooling sector water pipe system (402); The circulating water system (4) also includes a main engine and auxiliary engine water pipe system (403), an auxiliary water pipe system (404), a water filling and drainage system (405) and a pressure stabilizing water replenishment system (406); the water pipe mother pipe (401), the cooling sector water pipe system (402), the main engine and auxiliary engine water pipe system (403), the auxiliary water pipe system (404), the water filling and drainage system (405) and the pressure stabilizing water replenishment system (406) respectively provide corresponding supporting facilities for the main engine and the auxiliary engine.

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

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

5. The main and auxiliary machine indirect air cooling system according to claim 1, characterized in that: The water main pipe (401), the cooling sector water pipe system (402), the main engine and auxiliary engine water pipe system (403), the auxiliary water pipe system (404), the water filling and drainage system (405) and the pressure stabilizing water replenishment system (406) respectively provide corresponding supporting facilities for the main engine and the auxiliary engine, including: The water pipe mother pipe (401) comprises a main machine hot water inlet mother pipe, an auxiliary machine hot water inlet mother pipe, a main machine cold water outlet mother pipe and an auxiliary machine cold water outlet mother pipe, wherein the main machine hot water inlet mother pipe and the main machine cold water outlet mother pipe are used to provide cooling for the main machine, and the auxiliary machine hot water inlet mother pipe and the auxiliary machine cold water outlet mother pipe are used to provide cooling for the auxiliary machine; The cooling sector water pipe system (402) comprises a main engine cooling sector hot water inlet pipe, a main engine cooling sector cold water return pipe, an auxiliary engine cooling sector hot water inlet pipe and an auxiliary engine cooling sector cold water return pipe, the main engine cooling sector hot water inlet pipe connects the equipment in the main engine cooling sector (301) with the main engine hot water inlet main pipe, the main engine cooling sector cold water return pipe connects the equipment in the main engine cooling sector (301) with the main engine cold water outlet main pipe, the auxiliary engine cooling sector hot water inlet pipe connects the equipment in the auxiliary engine cooling sector (302) with the auxiliary engine hot water inlet main pipe, and the auxiliary engine cooling sector cold water return pipe connects the equipment in the auxiliary engine cooling sector (302) with the auxiliary engine cold water outlet main pipe; The main engine and auxiliary engine water pipe system (403) comprises a main engine water pipe system (403.1) and an auxiliary engine water pipe system (403.2), wherein the main engine water pipe system (403.1) connects the main engine with the main engine hot water inlet main pipe and the main engine cold water outlet main pipe, and the auxiliary engine water pipe system (403.2) connects the auxiliary engine with the auxiliary engine hot water inlet main pipe and the auxiliary engine cold water outlet main pipe; The auxiliary water pipe system (404) is provided for each main machine or auxiliary machine with a bypass pipe and a bypass valve (404.1) for allowing water to flow directly back to the circulating water system (4), and an emergency discharge pipe (404.2) for quickly discharging water; The water filling and drainage system (405) comprises a water filling pump (405.1) and a water storage tank (405.2), wherein the water filling pump (405.1) comprises a main machine water filling pump for filling water for the main machine and an auxiliary machine water filling pump for filling water for the auxiliary machine, and the water storage tank (405.2) comprises a main machine water storage tank for storing water for the main machine and an auxiliary machine water storage tank for storing water for the auxiliary machine; The pressure-stabilizing water replenishment system (406) comprises a water replenishment pump (406.1) and an expansion water tank (406.2). The water replenishment pump (406.1) comprises a main machine water replenishment pump for replenishing water for the main machine and an auxiliary machine water replenishment pump for replenishing water for the auxiliary machine. The expansion water tank (406.2) comprises a main machine high-position expansion water tank configured for the main machine and an auxiliary machine high-position expansion water tank configured for the auxiliary machine.

6. The main and auxiliary machine indirect air cooling system according to claim 5, characterized in that: The water filling and drainage system (405) further comprises 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 intercooling tower (2); the water filling pipe (405.3) and the valve (407) are used to connect the water storage tank (405.2), the water filling pump (405.1) and the circulating water system (4); and the drainage pipe and the valve (407) are used to connect the circulating water system (4) and the drainage outlet.

7. The main and auxiliary machine indirect air cooling system according to claim 5, characterized in that: The pressure-stabilizing water replenishment system (406) further comprises a connecting pipe, the water replenishment pump (406.1) is arranged in a pump pit next to the water storage tank (405.2), the expansion water tank (406.2) is located at the upper part of the radiator (303) in terms of height, and the water replenishment pump (406.1) automatically controls the replenishment of water to the circulating water system (4) through the connecting pipe according to the water level of the expansion water tank (406.2).

8. The main and auxiliary machine indirect air cooling system according to claim 1, characterized in that: It also includes a cleaning system, which uses desalted water as flushing water and a vertical rectangular frame structure as a cleaning device. The cleaning device stands on the inner circumference of the radiator (303), and the frame is equipped with an intelligent cleaning robot that can move up and down in real time to clean at a fixed time and point.

9. The main and auxiliary machine indirect air cooling system according to claim 8, characterized in that: The cleaning robot is provided with gears capable of adsorbing and climbing walls, a nozzle row capable of moving at a fixed point, and a cleaning function capable of 60° rotating spraying.

10. The main and auxiliary machine indirect air cooling system according to claim 1, characterized in that: An auxiliary machine spray water pump is also provided, and the auxiliary machine spray water pump is arranged in a pump pit next to the water storage tank (405.2).

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