CN104457317A - Stand-pipe indirect-direct two-stage evaporative cooling tower - Google Patents

Abstract

The invention discloses a stand-pipe indirect-direct two-stage evaporative cooling tower, comprising a two-stage evaporative cooling tower. The two-stage evaporative cooling tower is connected with a surface type condenser respectively through a water supply pipe and a discharging tube, and the surface type condenser is sequentially connected with a steam turbine, a boiler, a high-pressure heater, a feed pump a, an deaerator, a low-pressure heater, a condensate booster pump, a condensate polishing device and a condensate pump by pipelines to form a closed loop. The stand-pipe indirect-direct two-stage evaporative cooling tower has the characteristics of low water and electric consumption and high refrigerating efficiency.

Description

Standpipe indirect plus direct two-stage evaporative cooling tower

technical field

The invention belongs to the technical field of air-conditioning and refrigeration equipment, and in particular relates to a vertical-pipe indirect plus direct two-stage evaporative cooling tower.

Background technique

Traditionally, air-cooled and water-cooled forms of exhaust steam condensation have been adopted in power plants in my country. Air-cooled cooling has high condensing temperature, high energy consumption, and low cooling efficiency; water-cooled circulating water pumps and fans consume a lot of power, and the cooling system occupies a large area and consumes a lot of water.

As energy saving has become the main task of today's society, especially in the northwest region where my country's water resources are scarce, there are serious deficiencies in the application of air cooling and water cooling, so cooling tower technology is needed in the power generation industry, but the existing cooling towers have energy-consuming Too much water, high power consumption and low efficiency.

Contents of the invention

The object of the present invention is to provide a vertical pipe indirect plus direct two-stage evaporative cooling tower, which has the characteristics of low water consumption, low power consumption and high refrigeration efficiency.

The technical scheme adopted in the present invention is that the standpipe directly adds a two-stage evaporative cooling tower, including a two-stage evaporative cooling tower, and the two-stage evaporative cooling tower is connected with a surface condenser, and the surface condenser passes through The pipeline is connected with the steam turbine, boiler, high-pressure heater, feed water pump a, deaerator, low-pressure heater, condensate booster pump, condensate polishing device and condensate pump in sequence to form a closed loop.

The present invention is also characterized in that:

The steam turbine is connected to the generator.

Two-stage evaporative cooling tower, including a cooling tower body, the cooling tower body is equipped with an internal cooling tower, and the lower part of the internal cooling tower is equipped with a plurality of vertical tube type indirect evaporative coolers around the outside of the internal cooling tower, each vertical tube type indirect The side wall of the cooling tower close to the evaporative cooler is correspondingly provided with a primary air inlet, the lower part of each primary air inlet is provided with a secondary air inlet, and the top of the cooling tower body is provided with an air outlet.

The internal cooling tower is a direct evaporative cooler.

The direct evaporative cooler includes packing, and the top of the packing is provided with water distributor b and water receiver in sequence. The water distributor b is composed of the first spray pipe and multiple downward spraying pipes evenly arranged on the first spray pipe. Composed of nozzles, the first spray pipe is connected to the surface condenser through the water supply pipe; there is a water storage tank under the filler, and the water storage tank is connected to the surface condenser through the outlet pipe; the first spray pipe is formed between the filler and the water storage tank. air duct.

A circulating water pump b is arranged on the water outlet pipe.

The cross-section of the packing is circular.

A secondary air exhaust duct is formed between the side wall of the cooling tower body and the side wall of the inner cooling tower, and between the top of the standpipe type indirect evaporative cooler and the air exhaust port.

The standpipe indirect evaporative cooler includes a heat exchange device, an air filter is arranged between the heat exchange device and the corresponding primary air inlet, and a water distributor a is arranged above the heat exchange device, and the water distributor a is provided by the first Two spray pipes and a plurality of downward spray nozzles evenly arranged on the second spray pipe; a circulating water tank is arranged under the heat exchange device, and the circulating water tank is connected with the second spray pipe through a water pipe; the heat exchange device and the second spray pipe are connected. A second air duct is formed between the circulating water tanks; the second air duct is set correspondingly to the secondary air inlet.

The air filter is a coarse-effect filter; the heat exchange device is composed of a plurality of vertically arranged heat exchange tubes; the water pipe is provided with a circulating water pump a.

The beneficial effects of the present invention are:

1) The two-stage evaporative cooling tower of the present invention adopts the combined form of indirect evaporative cooling and direct evaporative cooling, so that the temperature drop of the primary air after cooling is greater, and then the temperature drop of the hot water sprayed by the water distributor of the inner cooling tower is increased, saving Reduce the consumption of circulating water and save the construction area of the cooling tower.

2) In the two-stage evaporative cooling tower of the present invention, the indirect evaporative cooler adopts a standpipe type, which reduces the size in the horizontal direction and saves the floor space of the cooling tower. service life.

3) The two-stage evaporative cooling tower of the present invention utilizes the natural ventilation formed by the hyperbolic cooling tower, which saves the secondary exhaust fan of the standpipe type indirect evaporative cooler, saving initial investment and operating costs.

4) In the two-stage evaporative cooling tower of the present invention, the temperature of the secondary exhaust air is lower than the external temperature, and the secondary exhaust air passage has isolated the heat transfer between the outside world and the internal cooling tower, thereby reducing the heat loss during the cooling process of the circulating water in the tower. amount of dissipation.

Description of drawings

Fig. 1 is the structural representation of the direct two-stage evaporative cooling tower with standpipe indirect of the present invention;

Fig. 2 is a sectional view of A-A in Fig. 1 .

In the figure, 1. Air filter, 2. Heat exchange device, 3. Water distributor a, 4. Secondary air exhaust duct, 5. Internal cooling tower, 6. Water eliminator, 7. Filler, 8. Cloth Water tank b, 9. Generator, 10. Steam turbine, 11. Boiler, 12. High pressure heater, 13. Feed water pump a, 14. Deaerator, 15. Low pressure heater, 16. Condensate booster pump, 17. Condensate polishing device, 18. Condensate pump, 19. Surface condenser, 20. Water storage tank, 21. Circulating water pump a, 22. Circulating water pump b, 23. Circulating water tank, 24. Water supply pipe, 25. Outlet pipe, 26. air outlet, 27. first air duct, 28. second air duct, 29. secondary air air inlet.

Detailed ways

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

The standpipe of the present invention directly adds two-stage evaporative cooling tower, and its structure is as shown in Figure 1, comprises two-stage evaporative cooling tower, and two-stage evaporative cooling tower is connected with surface condenser 19, and surface condenser The device 19 is sequentially connected with the steam turbine 10, the boiler 11, the high pressure heater 12, the feed water pump a13, the deaerator 14, the low pressure heater 15, the condensate booster pump 16, the condensate polishing device 17 and the condensate pump 18 through pipelines form a closed loop.

The steam turbine 10 can also be connected to a generator 9 .

The two-stage evaporative cooling tower has a structure as shown in Figure 1, including a cooling tower body, the center of the cooling tower body is provided with an inner cooling tower 5, and the lower part of the inner cooling tower 5 is provided with a plurality of vertical cooling towers around the outer side of the inner cooling tower 5. In the tube-type indirect evaporative cooler, a primary air inlet is provided on the side wall of the cooling tower body corresponding to each vertical pipe-type indirect evaporative cooler, and a secondary air inlet 29 is provided at the lower part of each primary air inlet, and the cooling An air outlet 26 is arranged on the top of the tower body.

The inner cooling tower 5 is a direct evaporative cooler.

The structure of the direct evaporative cooler is shown in Figure 1. It includes a packing 7, and above the packing 7, a water distributor b8 and a water collector 6 are sequentially arranged. The water distributor b8 is arranged uniformly on the The first spray pipe is composed of a plurality of downward spraying nozzles, the first spray pipe is connected with the surface condenser 19 through the water supply pipe 24; the water storage tank 20 is arranged under the packing 7, and the packing 7 and the water storage tank 20 A first air passage 27 is formed between them, and the water storage tank 20 is connected to the surface condenser 19 through a water outlet pipe 25, and a circulating water pump b22 is arranged on the water outlet pipe 25.

As shown in FIG. 2 , the filler 7 has a circular cross section.

A secondary air exhaust duct 4 is formed between the side wall of the cooling tower body and the side wall of the inner cooling tower 5 , and between the top of the standpipe type indirect evaporative cooler and the air exhaust port 26 .

The standpipe type indirect evaporative cooler includes a heat exchange device 2, an air filter 1 is arranged between the heat exchange device 2 and the corresponding primary air inlet, and a water distributor a3 is arranged above the heat exchange device 2, and the water distributor The device a3 is composed of a second spray pipe and a plurality of downward spray nozzles evenly arranged on the second spray pipe; a circulating water tank 23 is arranged under the heat exchange device 2, and the circulating water tank 23 is connected with the second spraying pipe through the water pipe. The pipe is connected, and the water pipe is provided with a circulating water pump a21.

A second air duct 28 is formed between the heat exchange device 2 and the circulating water tank 23 ; the second air duct 28 is arranged corresponding to the secondary air inlet 29 .

The heat exchange device 2 is composed of a plurality of vertically arranged heat exchange tubes.

The effect of each component in the standpipe indirect plus direct two-stage evaporative cooling tower of the present invention is as follows:

The air filter 1 can be selected as a coarse-effect filter to filter the air and reduce water pollution.

The standpipe indirect evaporative cooler performs isohumid cooling of the primary air, reducing the wet bulb temperature of the primary air.

The hot water generated by the boiler 11 is used to supply the inner cooling tower 5, and the hot water is sprayed out from the nozzle of the water distributor b8 to form a thin film on the packing 7, so that the primary air can exchange heat sufficiently in reverse flow.

Combining standpipe indirect evaporative cooling and direct evaporative cooling achieves the goals of water saving, energy saving and enhanced cooling efficiency.

The high-pressure heater 12, feed water pump a13, deaerator 14, low-pressure heater 15, condensed water booster pump 16, condensed water polishing device 17 and condensed water pump 18 connected to the boiler 11 are all used to treat the water delivered by the boiler 11. Water quality, easy to spray directly from the nozzle.

The working process of the standpipe indirect plus direct two-stage evaporative cooling tower of the present invention:

The wind system workflow is:

1) Primary air system:

After the primary air enters through the primary air inlet, it is filtered by the air filter 1 and then enters the vertical tube indirect evaporative cooler, where it is cooled outside the heat exchange tube in the heat exchange device 2, and the air after the humidity cooling enters the inner cooling tower 5 , first contact with the falling water on the lower side of the filler 7 to exchange heat and moisture, then directly contact the circulating water film on the surface of the filler 7 to cool down, and finally collect the water through the water eliminator 6 and discharge it to the outside of the cooling tower through the air outlet 26.

2) Secondary air system:

The secondary air enters the standpipe type indirect evaporative cooler through the secondary air inlet 29, flows into the heat exchange device 2 through the second air channel 28, and directly contacts the circulating water film attached to the inner wall of the heat exchange tube for heat exchange, and The primary air outside the heat exchange tube is subjected to indirect heat exchange, and finally enters the secondary air exhaust channel 4, and is discharged to the outside of the cooling tower through an exhaust port 26 under the action of natural convection.

The water system workflow is:

1) The working process of the circulating water of the standpipe indirect evaporative cooler:

The circulating water on the secondary air side is sent to the first spray pipe of the water distributor a3 through the circulating water pump a21, sprayed with water through multiple nozzles arranged on the first spray pipe, and then enters the cooling system in the standpipe indirect evaporative cooler. In the heat device 2, after heat and moisture exchange with the secondary air, it falls into the circulating water tank 23, and the cycle reciprocates.

2) The working process of circulating water in the inner cooling tower 5:

The hot water passing through the surface condenser 19 is sent to the water distributor b8 through the action of pressure, and through the water distributor b8, the hot water is sprayed onto the filler 7 by multiple nozzles on the second spray pipe, and the water is mixed with the primary air. The temperature of the heat and moisture exchange decreases, and falls into the water storage tank 20 under the action of gravity, and finally is sent to the surface condenser 19 for heat exchange under the action of the circulating water pump b22, and the cycle reciprocates.

The standpipe indirect plus direct two-stage evaporative cooling tower of the present invention organically combines components such as the air filter 1, the standpipe indirect evaporative cooler, and the direct evaporative cooler. The exterior of the cooling tower body adopts a hyperbolic layout, and the cooling tower body forms a double-layer arrangement. The inner layer circulates the primary air that exchanges heat with the circulating water, and the outer layer circulates the secondary air, so that the internal exchange through the indirect evaporative cooler through the standpipe The secondary air of the heating device is discharged by the method of natural exhaust after the temperature and humidity treatment, which saves the use of the secondary exhaust fan; in addition, the standpipe of the present invention directly adds a two-stage evaporative cooling tower, which has a simple structure and increases The temperature drop of the circulating water is increased, the water consumption is reduced, and the efficiency of the cooling tower and thermal power generation is improved.

Claims (10)

1. standpipe adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, include double-level evaporation-type cooling tower, described double-level evaporation-type cooling tower is connected with surface condenser (19), and described surface condenser (19) connects and composes closed-loop path with steam turbine (10), boiler (11), high-pressure heater (12), feed pump a (13), oxygen-eliminating device (14), low-pressure heater (15), condensate booster pump (16), precision processing device of condensation water (17) and condensate pump (18) successively by pipeline.

2. standpipe according to claim 1 adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, described steam turbine (10) is connected with generator (9).

3. standpipe according to claim 1 and 2 adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, described double-level evaporation-type cooling tower, include cooling column body, interior cooling tower (5) is provided with in described cooling column body, the lower peripheral of described interior cooling tower (5) has multiple standpipe type indirect evaporation cooler around interior cooling tower (5) arranged outside, on the cooling column body sidewall that each standpipe type indirect evaporation cooler is close, correspondence is provided with a First air air inlet, each First air air inlet bottom is provided with a Secondary Air air inlet (29), described cooling column body top is provided with exhaust outlet (26).

4. standpipe according to claim 3 adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, described interior cooling tower (5) is direct-evaporation-type cooler.

5. standpipe according to claim 4 adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, described direct-evaporation-type cooler includes filler (7), the top of described filler (7) is disposed with water-locator b (8) and water collection device (6), described water-locator b (8) is made up of the first shower and the nozzle that is evenly arranged at multiple downward spray on the first shower, and described first shower is connected with surface condenser (19) by feed pipe (24);

The below of described filler (7) is provided with storage tank (20), and described storage tank (20) is connected with surface condenser (19) by outlet pipe (25);

The first air channel (27) is formed between described filler (7) and storage tank (20).

6. standpipe according to claim 5 adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, described outlet pipe (25) is provided with water circulating pump b (22).

7. standpipe according to claim 5 adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, the cross section of described filler (7) is circular.

8. standpipe according to claim 5 adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, between described cooling column body sidewall and interior cooling tower (5) sidewall, between the top of standpipe type indirect evaporation cooler and exhaust outlet (26), form auxiliary air exhausting duct (4).

9. the standpipe according to claim 5 or 8 adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, described standpipe type indirect evaporation cooler, include heat-exchanger rig (2), air cleaner (1) is provided with between described heat-exchanger rig (2) and corresponding First air air inlet, the top of described heat-exchanger rig (2) is provided with water-locator a (3), and described water-locator a (3) is made up of the second shower and the shower nozzle that is evenly arranged at multiple downward spray on the second shower; The below of described heat-exchanger rig (2) is provided with cyclic water tank (23), and described cyclic water tank (23) is connected with the second shower by water pipe;

The second air channel (28) is formed between described heat-exchanger rig (2) and cyclic water tank (23); Described second air channel (28) is corresponding with Secondary Air air inlet (29) to be arranged.

10. standpipe according to claim 9 adds direct double-level evaporation-type cooling tower indirectly, it is characterized in that, described air cleaner (1) is low efficient filter;

Described heat-exchanger rig (2) is made up of the heat exchanger tube that many are vertically arranged;

Described water pipe is provided with water circulating pump a (21).