CN100462659C - Cooling tower water temperature control method - Google Patents

Abstract

The invention discloses a method for regulating and controlling temperature of water in a cooling tower in a power plant. A circle of water pipes and a plurality of water-cooling blows are arranged outside an air inlet port of a cooling tower, a plurality of branch water pipes are equipped in the water-cooling blower, and cold water is introduced into the branch water pipes of the blower from the circle of water pipes. An induced fan and a blast blower are disposed in the water-cooling blower, and the surrounding air is introduced by the induced fan in the blower, subjected to heat exchange with the cold water in the branch water pipes, and then blew to the lower part of the cooling tower by the blast blower. The inventive method converts surrounding air to strong cold air that can be used as cold air source for cooling the cooling water temperature. Meanwhile, the invention improves the sprinkling device, so as to further cool the cooling water. The invention has the advantages of environmentally friendless, no pollution, low cost, good energy-saving effect, long service life, and high social benefit.

Description

Cooling tower water temperature control method

1. Technical field

The invention belongs to cooling tower temperature control technology, in particular to a water temperature control method of a hyperbolic cooling tower in a power plant.

2. Background technology

Whether the cooling tower of a power plant can work well in summer is a necessary condition for full-load power generation and safe power generation. Only when the cooling tower has sufficient cooling effect and provides enough cooling water to the condenser of the turbogenerator can the condensation be guaranteed. The necessary vacuum degree of the device, so as to ensure the normal operation of the turbogenerator set. The lower the temperature of the cooling water, the greater the work done by the same amount of steam, and the higher its effective utilization rate. Whether the cooling tower can achieve its due efficiency is the key to whether the power plant can save coal and electricity, save energy, and reduce power generation costs. It is an important condition and a key issue affecting the economic benefits of enterprises. At present, the cooling water of cooling towers in power plants is cooled by natural wind, and its efficiency is very low when the temperature is high in summer.

The water distribution system of the cooling tower in the power plant is as follows: the inlet water of the cooling tower flows through the vertical shaft through the pressure pipe, diverts it to each water distribution tank, and then forms fine and uniform water drops on the spraying filler through the spraying device. The main part of the exchange is the water spray filler, which blocks the splashing and falling water droplets, forms a water film and raindrops with a large surface area, fully contacts with the surrounding air, completes heat exchange by evaporation, conduction and convection, and makes the circulating water get chilled. In the current technology, the top of the shaft and the water distribution tank are all open, relying on the natural cooling of the falling and splashing process of water droplets, and the temperature, wind speed, humidity, atmospheric pressure, etc. all have a great influence on the water cooling effect. In summer, the actual temperature of the cooling water is much higher than the design temperature, which is far from the economic cooling water temperature requirement. At present, the more commonly used splash cooling device is the "water nozzle-splashing dish device", which uses the hydrostatic head formed by a certain water depth to make the water form a jet downward, shoot to the splashing dish, and splash the jet Scatter into uniform water drops and sprinkle them on the water-sprinkling filler, which can reduce the cooling range of circulating water by 5-15%. Its disadvantage is that the unit volume of splashed water droplets is large, and the cooling efficiency is low.

3. Contents of the invention

The purpose of the present invention is to provide a cooling tower water temperature control method, which uses strong cold wind to replace the existing natural wind, so as to improve the working efficiency of the cooling tower and achieve the purpose of saving energy and reducing consumption. The technical solution adopted in the present invention is: install a circle of water pipeline and multiple water cooling fans outside the air inlet of the cooling tower, the circle of water pipeline is connected with each water cooling fan, and a plurality of branch water pipes are arranged in the water cooling fan, and the cold water enters the fan from the circle of water pipeline in the branch water pipe. There are induced draft fan and blower in the water-cooled fan. The external air is introduced through the induced draft fan. After heat exchange with the cold water in the branch water pipe in the fan, the blower blows into the lower part of the cooling tower, so that the lower part of the cooling tower can get strong cold air.

When the temperature is high in summer, the water cooling fan is turned on, and the cold water enters the branch water pipes of the fan through a week of water pipes, and is sprayed from the outlet of each branch water pipe into the tower from the nozzle, as a supplementary water source for cooling tower water evaporation loss. The branch water pipes in the air duct continuously emit a large amount of cold air, and the air introduced by the induced draft fan enters the water cooling fan to generate eddy currents, sweeping the cold air, and the powerful cold air is transported to the tower by the blower to cool down the cooling water.

The method of the invention is environment-friendly, pollution-free, low in cost, good in energy-saving effect, long in service period and great in social benefits.

4. Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the structural representation of water cooling fan;

Fig. 4 is a left side view of Fig. 3 .

5. Specific implementation

On the outside of the air inlet of cooling tower 1, set a round water pipeline 2 and a plurality of water cooling fans 3, and the round water pipeline 2 communicates with each water cooling fan 3. The cold water source comes from the supplementary water source of the cooling tower, and enters the branch water pipes of the fan through the round water pipeline. , the water flows to the end and is sprayed into the tower by the nozzle. Chinese patent application "quick spray freezing cold protection method" (200510085723.7) introduces a method for cooling towers to prevent cold in winter. Higher efficiency operation, saving energy and prolonging the service life of equipment. "Quick Spray Icing Protection Method"

(200510085723.7) in the periphery of cooling tower 1, a water pipeline 2 is set, and the air inlet of the cooling tower is surrounded by metal mesh 4, and branch water pipeline 5 and water nozzle 6 are set. The weekly water pipeline 2 here can be shared with the present invention to reduce investment and cost.

The improvement of the water distribution and splashing device is that the vertical shaft 7 and the water distribution tank are all closed to form a closed circulation pipeline 8, and a plurality of adjustable spray nozzles 9 are installed below the circulation pipeline 8, and the spouts of the spray nozzles 9 face the horizontal direction. The water sources of the vertical shaft 7 flow through the water distribution pipelines respectively, relying on the flow and pressure of the vertical shaft water sources, they are provided to the adjustable spray nozzle 9 to be sprayed out, and the direction of spraying is lateral spraying, and sprinkled on the water spraying filler 10, so that The distance of spraying water droplets can be extended in the same space, which wins time for the cooling of water. The water drops that adjustable spray nozzle 9 sprays can be large or small, and can be adjusted to the big raindrops of moderate rain from the water drops of fine mist, adapt to the needs of different seasons, in order to reduce evaporation loss, the water drops size of spraying should be in Minimal evaporation loss, maximum cooling efficiency is moderate. Compared with the splash device used in the existing production, the adjustable spray nozzle 9 can greatly improve the cooling efficiency under the same natural conditions, so as to achieve the purpose of fast and efficient cooling. In order to prevent the cooling tower from temporarily shutting down in winter, an air intake valve 11 is provided on the circulation pipeline 8 to facilitate the discharge of accumulated water in the pipeline.

The water-cooling fan 3 has a horizontal fan cylinder 12 with one end large and the other end small, the large end faces the outside, and the small end faces the cooling tower 1. There is a ring-shaped water tank 13 at the air inlet at the outer end of the cylinder 12, and a plurality of them are connected to the center of the fan. The two ends of the vertical branch water pipe 14 communicate with the annular water tank 13, and there is an induced draft fan 15 inside the annular water tank. The side wall branch water pipe 16 is arranged, and the outer end of the side wall branch water pipe 16 is connected with the annular water tank 13, and the inner end is equipped with a nozzle towards the cooling tower; the blower 17 is located at the air outlet at the inner end of the fan cylinder. During work, cold water enters the annular water tank 13 of water cooling fan through the water pipe 18 that is connected with one week water pipeline 2, flows into each branch water pipe 14,16 respectively, radiates a large amount of cold air. The air from the outside is introduced by the induced draft fan 15 into the water-cooling fan, and the vortex is generated to sweep the cold air. The cold air is sent to the end of the water-cooling fan, and is discharged into the cooling tower by the blower 17. The cold water is flowing water, which flows from the outer end of the water-cooling fan to the inside. end, ejected from the nozzle. The number of nozzles and the flow rate of water depend on the total amount of cooling tower water evaporation loss.

Claims (4)

1. cooling column water temperature regulate and control method, comprise cooling wind regime and spraying and splashing facility, it is characterized in that: one all water lines (2) and a plurality of water-cooled blower fan (3) are installed in cooling tower (1) the air inlet outside, one all water lines (2) are communicated with water-cooled blower fan (3), the water-cooled blower fan is provided with a plurality of minutes branching pipes in (3), and cold water is entered in the branch branching pipe of described water-cooled blower fan (3) by all water lines (2); In water-cooled blower fan (3), air-introduced machine and air blast are arranged, outside air is introduced, in described water-cooled blower fan (3) with after dividing cold water in the branching pipe to carry out heat exchange, be blown into the cooling tower bottom by air blast again by air-introduced machine.

2. cooling column water temperature regulate and control method according to claim 1, it is characterized in that: said spraying and splashing facility is that vertical shaft (7) upper end and distribution channel are all sealed, form enclosed circulation pipeline (8), a plurality of spray nozzles (9) are installed below circulation pipeline (8), and the spout of spray nozzle (9) is towards horizontal direction.

3. cooling column water temperature regulate and control method according to claim 2 is characterized in that: on the circulation pipeline (8) that the distribution channel sealing forms air inlet pipe (11) is installed.

4. cooling column water temperature regulate and control method according to claim 1, it is characterized in that: said water-cooled blower fan (3) has the water-cooled blower fan cylindrical shell (12) that a horizontal end is big, an end is little, big end toward the outer side, small end is towards cooling tower, there is ring-type water tank (13) at the air intake vent place in water-cooled blower fan cylindrical shell (12) outer end, many are communicated with ring-type water tank (13) with vertical branch branching pipe (14) two ends of water-cooled blower fan (3) central axis, in ring-type water tank (13) inboard air-introduced machine (15) are arranged; Also be provided with along water-cooled blower fan barrel is inboard how row's sidewalls divide branching pipe (16) week, sidewall divides the outer end of branching pipe (16) to be communicated with ring-type water tank (13), and nozzle is equipped with towards cooling tower in the inner; Air blast (17) is positioned at the inner air outlet of water-cooled blower fan cylindrical shell place.

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