CN103697718B - Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system - Google Patents

Abstract

The spray cooling system of the closed evaporative cooling water chiller for power plant air cooling disclosed by the present invention comprises a closed evaporative cooling water chiller, the closed evaporative cooling water chiller is connected to the water storage tank through the pipe, the water storage tank is through the pipe, the spray pipe a and the nozzle a Connection; the closed-type evaporative cooling chiller is connected to the feedwater pump through the condensate return pipe a, and the feedwater pump is connected to the high-pressure heater, boiler, superheater and steam turbine through the pipeline. The branch pipes are connected to the air-cooled radiator, condenser, and hybrid condenser, and the direct air-cooling device is connected to the condensate return pipe b, the pipe, and the condensate return pipe a through pipes. The cooling system of the present invention utilizes evaporative cooling technology and is combined with the air-cooling device of a thermal power plant to ensure safe, efficient, and economical operation of the air-cooling system of the power plant during high-temperature periods under a certain amount of water consumption, increase the power generation load of power plant generator sets during high-temperature periods, and improve the efficiency of the power plant. power generation benefits.

Description

Closed evaporative cooling chiller spray cooling system for power plant air cooling

technical field

The invention belongs to the technical field of air conditioning equipment, and relates to a spray cooling system of a closed evaporative cooling water chiller for power plant air cooling, in particular to a closed evaporative cooling water chiller, a direct air cooling device, an indirect cooling device of a surface condenser, a mixing The air-cooled spray cooling system of the power plant combined with the indirect cooling device of type condenser, water storage tank, spray equipment and related circulating water treatment equipment, boiler and steam turbine.

Background technique

In the dry area of Northwest my country, there are abundant coal resources, which is why thermal power plants are concentrated in this area, but the lack of water resources in dry areas poses a great test for the condensing system of thermal power plants. For thermal power plants in Northwest my country, it is forbidden to adopt the cooling form of traditional wet cooling cooling towers, which makes air cooling have great development potential.

According to the characteristics of natural resources in the area where thermal power plants are located in Northwest China, direct air cooling devices, surface condenser indirect cooling devices and hybrid condenser indirect cooling devices are currently used as the main methods of power plant condensation systems. According to the actual operation effect of the current air cooling device, during the high temperature period in summer, the heat exchange efficiency of the air cooling radiator decreases, the system back pressure increases, and the power generation load decreases, which has caused great troubles to the economic production of the power plant.

Evaporative cooling technology has the advantages of energy saving, environmental protection, water saving, and economical operation. It is especially suitable in dry areas and is deeply loved by users. In Northwest China, the evaporative cooling unit can treat the temperature of the circulating water to be lower than the wet bulb temperature of the outdoor air, which has a good promotion value compared with mechanical refrigeration. The spray cooling technology based on the principle of evaporative cooling technology can effectively use the lower temperature spray circulating water temperature of the evaporative cooling chiller, and has a better treatment effect on air spray cooling. In view of the phenomenon that the heat exchange efficiency of radiators decreases during the high temperature period of the air cooling system of the power plant, evaporative cooling chillers are used to treat desalted water and reduce the temperature of desalted water. The nozzle is atomized into small mist, which exchanges heat and moisture with the inlet air, reduces the temperature of the inlet air, improves the heat exchange efficiency of the radiator, and ensures that the air-cooled radiator can operate safely, economically and efficiently during high temperature periods, providing a guarantee for the high-load operation of the generator set , improve the economy of the power plant.

To sum up, for the air-cooling system of thermal power plants in Northwest China, the closed evaporative cooling chiller is used to cool down the desalinated water. Wet exchange reduces the inlet air temperature of the air-cooled radiator and improves the heat dissipation efficiency of the air-cooled radiator during high temperature periods.

Contents of the invention

The object of the present invention is to provide a spray cooling system for a closed evaporative cooling water chiller used in power plant air cooling, which improves the heat exchange efficiency of the air cooling radiator, the system back pressure and the power generation efficiency.

The technical scheme adopted in the present invention is that the spray cooling system of the closed evaporative cooling water chiller for power plant air cooling includes a closed evaporative cooling water chiller, the closed evaporative cooling water chiller is connected with the water storage tank through the pipeline _G1 , and the water storage tank passes through The pipe G ₂ and the spray pipe a are connected to the nozzle a in the direct air cooling device;

_The closed evaporative cooling chiller is connected to the feed water pump through the condensate return pipe a, and the feed water pump is connected to the high pressure heater, boiler, superheater and steam turbine in turn through the pipe G3. Connect the air-cooled radiator a in the direct air-cooling device, the condenser in the indirect cooling device of the surface condenser, and the hybrid condenser in the indirect cooling device of the hybrid condenser through the exhaust steam branch pipe, and the direct air-cooling device passes through Pipeline G ₄ is sequentially connected with condensate return pipe b, pipe G ₅ , and condensate return pipe a.

The present invention is also characterized in that,

The water storage tank is an insulated water storage tank.

A generator is arranged on one side of the steam turbine.

Condensate pumps, iron removers, condensate polishing devices, condensate booster pumps, low-pressure heaters and deaerators are arranged in sequence along the outlet direction of the hybrid condenser _on the pipeline G5.

The hybrid condenser indirect cooling device includes an air-cooling tower and a hybrid condenser. An air-cooled radiator c is installed on the opposite sides of the lower part of the air _- cooling tower. The lower part of the hybrid condenser is connected to the condensate return through the pipeline G The water pipe b is connected, and the air-cooled radiator c on one side is connected to the desalted water return pipe b and the desalted water supply pipe b respectively, the desalted water return pipe b is connected to the spray device in the hybrid condenser, and the desalted water supply pipe b The pipeline _G6 is connected, and a spray pipeline c with a nozzle c is provided near the air-cooled radiator c _on the other side, and the spray pipeline c is connected with the pipeline G2.

A spray water pump is arranged _on the pipeline G2.

The surface condenser indirect cooling device includes an air-cooling tower and a condenser. An air-cooling radiator b is arranged on the opposite sides of the lower part of the air-cooling tower. _The condenser is connected to the pipeline G4 through the pipeline G7 _. The air-cooled radiator b is respectively connected to the condenser through the desalted water return pipe a and the desalted water supply pipe a to form a closed circuit. The air-cooled radiator b on the other side is provided with a spray pipe b with a nozzle b. The spray pipe b is connected to the condenser. Spray pipe a connection.

The direct air cooling device includes an air cooling radiator a, and a direct air cooling exhaust fan and a nozzle a are arranged in the air cooling radiator a.

The air-cooling radiator a is a V-shaped air-cooling radiator.

The beneficial effects of the present invention are:

1. Utilize the power plant's own water treatment equipment to treat the excess amount of water, increase part of the tap water to be treated as desalinated water through the water treatment equipment, and then enter the spray cooling system of the closed-type evaporative cooling water chiller for power plant air cooling of the present invention, and use the closed-type The evaporative cooling chiller cools down the desalinated water, and the desalinated water after cooling is stored in the water storage tank. During the high temperature period in summer, the low-temperature water in the water storage tank is cooled by direct air cooling and indirect surface condenser under the action of the spray water pump. The air-cooled radiator inlet of the system and the hybrid condenser indirect cooling system is atomized, and the inlet air is humidified and cooled, which can improve the air-cooled heat exchange efficiency to a certain extent, thereby reducing the system back pressure, improving power generation efficiency and reducing coal consumption for power generation.

2. In the spray cooling system of the closed-type evaporative cooling chiller for power plant air cooling of the present invention, the closed-type evaporative cooling chiller is used to cool the desalinated water. Compared with the traditional mechanical refrigeration method of lowering the water temperature, the evaporative cooling technology is energy-saving and environmentally friendly. , The advantage of low energy consumption in operation, and the closed structure at the same time reduces the impact on the water quality of desalted water and ensures the safe and effective operation of the air-cooled radiator.

3. The spray cooling system of the closed-type evaporative cooling chiller used for air cooling of the power plant of the present invention is provided with a water storage tank, and heat preservation treatment is carried out at the same time, and the desalinated water is produced by using the surplus of the existing water treatment equipment of the power plant, and the desalinated water is passed through the closed-type evaporative cooling The chiller is cooled and stored in the water storage tank, which ensures that the air-cooled radiator has sufficient spray water at a lower temperature when the heat dissipation is insufficient.

Description of drawings

Fig. 1 is a schematic structural view of the spray cooling system of the closed-type evaporative cooling water chiller for power plant air cooling according to the present invention.

In the figure, 1. Spray water pump, 2. Water storage tank, 3. Closed evaporative cooling chiller, 4. Condensate return pipe a, 5. Condensate return pipe b, 6. Condensate pump, 7. Iron remover, 8. Condensate polishing device, 9. Condensate booster pump, 10. Low pressure heater, 11. Feed water pump, 12. Deaerator, 13. High pressure heater, 14. Boiler, 15. Superheater, 16. Steam turbine, 17. Generator, 18. Exhaust steam pipeline of steam turbine, 19. Direct air cooling device, 20. Direct air cooling exhaust fan, 21. Air cooling radiator a, 22. Nozzle a, 23. Spray pipe a, 24. Surface condenser Indirect cooling device, 25. Condenser, 26. Desalted water return pipe a, 27 Desalted water supply pipe a, 28. Air cooling radiator b, 29. Air cooling tower, 30. Spray pipe b, 31. Nozzle b, 32. Hybrid condenser indirect cooling device, 33. Hybrid condenser, 34. Desalted water return pipe b, 35. Desalted water supply pipe b, 36. Nozzle c, 37. Spray pipe c, 38. Air-cooled radiator c .

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The closed evaporative cooling chiller spray cooling system for power plant air cooling of the present invention has a structure as shown in Figure 1, including a closed evaporative cooling chiller 3, which is connected to the water storage tank 2 through the pipeline _G1 , the water storage tank ₂ is connected to the nozzle a22 in the direct air cooling device 19 through the pipeline G2 and the spray pipeline a23 in turn; the closed evaporative cooling chiller ₃ is connected to the feedwater pump 11 through the condensate return pipe a4, and the feedwater pump 11 is connected through the pipeline G3 Connect with high-pressure heater 13, boiler 14, superheater 15 and steam turbine 16 successively, steam turbine 16 is connected with steam turbine exhaust steam pipeline 18, steam turbine exhaust steam pipeline 18 passes exhaust steam branch pipe and the air-cooling radiator a21 in the direct air cooling device 19, The condenser 25 in the indirect cooling device 24 of the surface condenser is connected to the hybrid condenser 33 in the indirect cooling device 32 of the hybrid condenser, and the direct air cooling device ₁₉ is connected to the condensate return pipe b5 in turn through the pipeline G4 , pipeline G ₅ , and condensed water return pipe a4 are connected.

The water storage tank 2 is an insulated water storage tank.

A generator 17 is provided on one side of the steam turbine 16 .

Condensate pump 6 , iron remover 7 , condensate polishing device 8 , condensate booster pump 9 , low pressure heater 10 and deaerator 12 are arranged in sequence along the outlet direction of hybrid condenser 33 _on pipeline G5.

The hybrid condenser indirect cooling device 32 has a structure as shown in Figure 1, including an air-cooling tower 29 and a hybrid condenser 33, and an air-cooling radiator c38 is respectively arranged on the opposite sides of the lower part of the air-cooling tower 29. The lower part of the condenser 33 is connected to the condensed water return pipe b5 through the pipe G6, and the air-cooled radiator c38 _on one side is respectively connected to the desalted water return pipe b34, the desalted water supply pipe b35, the desalted water return pipe b34 and the hybrid condenser The spraying device in 33 is connected, the desalted water supply pipe b35 is connected to the pipe G6, and the air-cooled radiator c38 on the other side is provided with a spray pipe c37 with a nozzle _c36 , and the spray pipe _c37 is connected to the pipe G2.

A spray water pump ₁ is arranged on the pipeline G2.

Surface type condenser indirect cooling device 24, its structure is shown in Figure 1, comprises air-cooling tower 29 and condenser 25, and the opposite two sides of air-cooling tower 29 bottoms are respectively provided with an air-cooling radiator b28, condenser 25 _The pipe G7 is connected to the pipe G4, and the air _- cooled radiator b28 on one side is respectively connected to the condenser 25 through the desalted water return pipe a26 and the desalted water supply pipe a27 to form a closed circuit, and the place near the air-cooled radiator b28 on the other side A spray pipe b30 with a nozzle b31 is provided, and the spray pipe b30 is connected to the spray pipe a23.

The structure of the direct air cooling device 19 is shown in FIG. 1 , including an air cooling radiator a21, and a direct air cooling exhaust fan 20 and a nozzle a22 are arranged in the air cooling radiator a21.

The air-cooling radiator a21 is a V-shaped air-cooling radiator.

The working process of the spray cooling system of the closed evaporative cooling water chiller for power plant air cooling of the present invention is:

1. The tap water replenishment pipe enters the closed evaporative cooling chiller 3 after being processed by the water treatment equipment of the power plant. After being cooled by the closed evaporative cooling chiller 3, it is sent to the thermal insulation water storage tank 2 for storage. The heat dissipation in the air-cooled radiator a21 is insufficient. When the back pressure of the direct air-cooling device 19 increases and the condensate temperature is too high, the spray pipe 23 connected to the air-cooling radiator a21 is opened, and the outdoor air enters the lower part of the air-cooling radiator a21 through the direct air-cooling exhaust fan 20, and heats up with the atomized water droplets. Humidity exchange, humidification and cooling, the cooled air passes over the air-cooling radiator a21, and the unevaporated water droplets fall to the surface of the air-cooling radiator a21 with the air, strengthening the heat dissipation of the air-cooling radiator a21, and the air after absorbing heat is discharged out of the air-cooling radiator a21.

2. When the heat of the air-cooled radiator b28 in the indirect cooling device 24 of the surface condenser is insufficient, the temperature of the circulating cooling water in the system rises, and when the load rate of the system decreases, the desalted water at a lower temperature in the heat preservation water storage tank 2 is sprayed The water pump 1 is sent to the outer nozzle b31 of the air-cooled radiator b28 in the indirect cooling device 24 of the surface condenser. After the air induction effect of the natural cooling tower 29, the outdoor air will bring the atomized water droplets into the air-cooled cooling tower at the bottom of the air-cooling tower 29. Outside the radiator b28, the outdoor air is humidified and cooled, and the cooled air passes through the air-cooled radiator b28 and is discharged into the atmosphere through the natural cooling tower 29.

3. When the heat of the air-cooled radiator c38 in the indirect cooling device 32 of the hybrid condenser is insufficient, the temperature of the circulating cooling water in the hybrid condenser 33 rises, and when the condensation efficiency decreases, the lower temperature in the heat preservation water storage tank 2 The desalinated water is sent to the air-cooled radiator c38 in the hybrid condenser indirect cooling device 32 through the spray water pump 1 to the outer nozzle c36, and enters the air cooling tower 29 to induce wind, and the air exchanges heat and moisture with the atomized water droplets, humidifies and cools down. After cooling down, the air passes over the air-cooling radiator c38, and discharges the cooling tower 29 after absorbing heat.

4. The exhaust steam after the steam turbine 16 generates electricity is condensed in the direct air cooling device 19, the indirect cooling device 24 of the surface condenser, and the indirect cooling device 32 of the hybrid condenser through the exhaust steam pipeline 18 and the branch pipe of the steam turbine. After the water is treated by the water treatment equipment of the power plant, it is sent to the boiler 14 through the feed water pump 11, and the high-temperature and high-pressure steam obtained by the boiler 14 is sent to the steam turbine 16 after adiabatic expansion, and the exhausted steam returns to the air-cooled radiator b28 and air-cooled radiator c38 to complete the cycle .

In the spray cooling system of the closed evaporative cooling chiller for power plant air cooling according to the present invention, the closed evaporative cooling chiller 3 cools the demineralized water after being treated by the water treatment equipment of the power plant, and sends the cooled demineralized water to the water storage tank 2 , through the spray cooling system composed of the water storage tank 2 and the spray pipeline, combined with the direct air cooling device 19, the surface condenser indirect cooling device 24 and the hybrid condenser indirect cooling device 32 adopted in the power plant, the direct air cooling device 19 can operate efficiently and economically. Among them, the closed evaporative cooling chiller 3 is used to ensure the quality of desalinated water, and the tap water is processed in the spare time by using the surplus of water treatment equipment in the power plant. After being processed by the closed evaporative cooling chiller 3, it is sent to the water storage tank 2 with heat preservation function During the high temperature period in summer, the heat transfer efficiency of the air-cooled radiator decreases, and when the power generation load is limited, the desalted water at a lower temperature in the water storage tank 2 is sent to each air-cooled radiator through the spray pump 1, and then passed through the nozzle mist. After cooling, the inlet air temperature of the air-cooled radiator is reduced, the heat exchange efficiency of the air-cooled radiator is improved, and the back pressure of the device is increased, the power generation efficiency is improved, and the coal consumption of power generation is reduced.

Compared with the traditional simple air-cooled heat dissipation device, when the outdoor air temperature is high, the heat dissipation of the air-cooled radiator will often decrease, resulting in excessively high condensate temperature or an increase in the temperature of circulating cooling water, causing the load rate of the power plant generator set to decrease. In the case of decline, the spray cooling system can reduce the temperature of the air that passes over the air-cooled radiator during the high-temperature period to a certain extent, improve the heat exchange efficiency of the radiator, and then increase the power generation load.

The water storage tank 2 stores enough demineralized water at a lower temperature to ensure that the heat exchange efficiency of the air-cooled radiator is unstable due to sudden temperature rises and changes; the water consumption of spray cooling is small, and under the premise of a certain water consumption To ensure the safe and economical operation of the direct air cooling device 19, a relatively ideal effect can be achieved with a relatively small investment, which has certain promotional value.

The spray cooling system of the closed evaporative cooling water chiller for power plant air cooling of the present invention comprises the spray cooling system composed of the closed evaporative cooling water chiller 3, the water storage tank 2, the spray pipeline, the direct air cooling device 19, and the indirect cooling device of the surface condenser 24 combined with the hybrid condenser indirect cooling device 32, the evaporative cooling chiller in the northwest region can reduce the water temperature to be lower than the wet bulb temperature of the outdoor air, rationally utilize the natural resources in the northwest region, adopt spray cooling measures, and use closed evaporation Cooling chillers reduce the water temperature of sprayed desalinated water. By installing spray facilities at the inlet of air-cooled radiators, the air temperature at the inlet of air-cooled radiators can be reduced, the heat exchange efficiency of air-cooled radiators can be improved, and the operating efficiency of the air-cooling system of power plants can be improved to ensure the safety of generator sets. economic operation.

Claims (9)

1. Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system, is characterized in that, include enclosed evaporative cooling handpiece Water Chilling Units (3), and described enclosed evaporative cooling handpiece Water Chilling Units (3) is by pipeline G ₁be connected with storage tank (2), described storage tank (2) is successively by pipeline G ₂, spray pipe a (23) is connected with the nozzle a (22) in Direct Air-Cooled device (19);

Described enclosed evaporative cooling handpiece Water Chilling Units (3) is connected with feed pump (11) by solidifying water return pipe a (4), and described feed pump (11) is by pipeline G ₃successively with high-pressure heater (13), boiler (14), superheater (15) and steam turbine (16) connect, described steam turbine (16) is connected with exhaust steam in steam turbine pipeline (18), described exhaust steam in steam turbine pipeline (18) is respectively by the air cooling heat radiator a (21) in exhaust steam arm and Direct Air-Cooled device (19), condenser (25) in surface condenser indirect cooling device (24), direct-contact type condenser (33) in direct-contact type condenser indirect cooling device (32) connects, described Direct Air-Cooled device (19) is by pipeline G ₄successively with solidifying water return pipe b (5), pipeline G ₅, solidifying water return pipe a (4) connects.

2. Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system according to claim 1, it is characterized in that, described storage tank (2) is heat preservation storage water tank.

3. Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system according to claim 1, it is characterized in that, described steam turbine (16) side is provided with generator (17).

4. Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system according to claim 1, is characterized in that, described pipeline G ₅on to be disposed with condensate pump (6), tramp iron separator (7), precision processing device of condensation water (8), condensate water boosting water pump (9), low-pressure heater (10) and oxygen-eliminating device (12) along described direct-contact type condenser (33) water outlet direction.

5. Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system according to claim 1, it is characterized in that, described direct-contact type condenser indirect cooling device (32), include air cooling tower (29) and direct-contact type condenser (33), relative both sides, described air cooling tower (29) bottom are respectively provided with an air cooling heat radiator c (38), and described direct-contact type condenser (33) bottom is by pipeline G ₆be connected with described solidifying water return pipe b (5), the air cooling heat radiator c (38) of side is connected to demineralized water return pipe b (34), demineralized water feed pipe b (35), described demineralized water return pipe b (34) is connected with the spray equipment in direct-contact type condenser (33), described demineralized water feed pipe b (35) and described pipeline G ₆connect, be provided with the spray pipe c (37) of band nozzle c (36) near air cooling heat radiator c (38) place of opposite side, described spray pipe c (37) and described pipeline G ₂connect.

6. Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system according to claim 5, is characterized in that, described pipeline G ₂on be provided with spraying water pump (1).

7. Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system according to claim 1, it is characterized in that, described surface condenser indirect cooling device (24), include air cooling tower (29) and condenser (25), relative both sides, described air cooling tower (29) bottom are respectively provided with an air cooling heat radiator b (28), and described condenser (25) is by pipeline G ₇with described pipeline G ₄connect, the air cooling heat radiator b (28) of side connects and composes closed-loop path respectively by demineralized water return pipe a (26), demineralized water feed pipe a (27) with described condenser (25), be provided with the spray pipe b (30) of band nozzle b (31) near air cooling heat radiator b (28) place of opposite side, described spray pipe b (30) is connected with described spray pipe a (23).

8. Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system according to claim 1, it is characterized in that, described Direct Air-Cooled device (19), include air cooling heat radiator a (21), in described air cooling heat radiator a (21), be provided with Direct Air-Cooled exhaust blower (20) and nozzle a (22).

9. Electric Factory Air-Cooling enclosed evaporative cooling handpiece Water Chilling Units spray cooling system according to claim 8, it is characterized in that, described air cooling heat radiator a (21) is V-type air cooling heat radiator.