CN107796238B - Air distribution structure of bottom blowing type cooling tower - Google Patents

Abstract

The invention discloses an air distribution structure of a bottom blowing cooling tower, comprising an air distribution structure arranged between a packing layer of the cooling tower and a blower, the air distribution structure comprising an upper air distribution plate, a lower air distribution plate, and a connecting plate , the upper ends of the upper air distribution plate and the lower air distribution plate are alternately arranged equidistantly along the circumference of the connecting plate, the lower ends of the upper air distribution plate and the lower air distribution plate are connected to the air guide tube around the blower, the upper air distribution plate, the lower air distribution plate The lower end of the air distribution plate is inclined to the side wall of the cooling tower, and there is a certain gap between the upper air distribution plate and the lower air distribution plate, so that the circulating water can flow into the bottom of the tower along the inclined upper and lower air distribution plates. The water collection tank prevents the circulating water from dripping onto the motor. At the same time, the setting of the upper air distributor and the lower air distributor reduces the falling height of the circulating water and reduces the noise of water spraying. At the same time, the cold air blown by the blower passes through the gap and directly passes through the packing layer. The circulating water is used for cooling, which improves the heat transfer efficiency of the cooling tower.

Description

Bottom blowing cooling tower air distribution structure

technical field

The invention relates to the technical field of cooling towers, in particular to a cooling tower air distribution structure.

Background technique

The cooling tower (The cooling tower) is a device that uses water as a circulating coolant to absorb heat from a system and discharge it to the atmosphere to reduce the water temperature; its cooling is to use water and air flow to exchange heat and cold to generate steam, and the steam volatilizes It is an evaporative cooling device that takes away heat to achieve evaporation, convective heat transfer and radiation heat transfer to dissipate waste heat generated in industry or in refrigeration and air conditioning to reduce water temperature, so as to ensure the normal operation of the system. The device is generally barrel-shaped, so called a cooling tower.

At present, mechanical ventilation cooling towers are widely used in many fields such as large shopping malls, hotels, gas stations, etc., but cooling towers will generate a lot of noise during operation, and the noise pollution sound source intensity can generally reach more than 80dB(A) Even bigger, affecting the normal life of surrounding staff and residents. With the gradual progress of society and the continuous development of science, people's requirements for the living environment and working environment have also been continuously improved, and the harmfulness of noise to people has gradually been recognized by people. So some scientific researchers engaged in cooling tower related industries began to study how to realize the noise reduction of cooling towers, especially how to ensure the noise reduction effect of cooling towers without affecting the heat transfer performance of cooling towers. Therefore, the control of cooling tower noise has become an urgent problem to be solved in the cooling tower industry.

In some special occasions, the installation height of the cooling tower is also limited. Based on some of the above requirements, a closed bottom blast cooling tower structure is proposed. This structure can solve the above-mentioned problems and reach the standard of environmental noise. But at the same time, there are also some research and development problems. The closed bottom blowing cooling tower installs the fan, motor and other transmission components at the bottom of the cooling tower, and adopts the bottom blowing method to make the external cold air enter the tower, and at the same time, the filling The circulating water in the layer should flow from the top to the bottom, and the external cold air enters the tower to cool down the circulating water flowing through the packing layer. At the same time, it is necessary to ensure that the air volume blown in cannot be too large, which will cause fine water droplets to be blown out from the top of the tower by the wind. If it is too small, the circulating water cannot be cooled (failure to meet the design requirements), and it must be ensured that the circulating water flowing down from the packing layer cannot flow from the fan and motor to the ground, and can only return to the sump at the bottom of the tower.

The noise of the bottom blast cooling tower mainly includes water spray noise, fan noise, mechanical noise, and tower body noise. The steady-state noise generated by the continuous falling water droplets hitting the bottom sump is called the water spray noise of the cooling tower. . The process of water spray noise is the impact noise caused by the circulating water in the cooling tower flowing from top to bottom, passing through the packing layer, and then falling into the water tank at the bottom of the cooling tower, which is called water spray noise. The noise intensity of spraying water is related to the volume, flow rate and falling water height of circulating water flowing through it per unit time.

Contents of the invention

The technical problem to be solved by the present invention is to provide a bottom blowing cooling tower air distribution structure, which can reduce noise and ensure cooling effect at the same time.

The structure of the existing diversion device will cause the wind speed of the cooling wind to be disordered and uneven, and there is a certain difficulty in installation, and there is no good diversion direction for the circulating water. The air distribution structure of the bottom blowing cooling tower of the present invention can not only ensure that the circulating water passing through the packing layer can only return to the sump at the bottom of the cooling tower, instead of falling on the fan motor and then flowing to the ground, and at the same time ensures The cooling air blasted from the bottom enters the tower body and directly contacts with the circulating water for cooling.

The technical solution adopted in the present invention is: the air distribution structure of the bottom blowing cooling tower, including the air distribution structure arranged between the packing layer of the cooling tower and the blower, the air distribution structure includes an upper air distribution plate and a lower air distribution plate , the connection plate, the upper ends of the upper air distribution plate and the lower air distribution plate are alternately arranged equidistantly along the circumference of the connection plate, the lower ends of the upper air distribution plate and the lower air distribution plate are connected to the air guide tube around the blower, and the upper air distribution plate The plate, the lower air distribution plate, the air guide tube and the connecting plate will isolate the circulating water after passing through the packing layer from the blower, the motor, etc., and the lower ends of the upper air distribution plate and the lower air distribution plate are inclined to the side wall of the cooling tower, so that the circulation Water can flow into the sump at the bottom of the tower along the inclined upper and lower air distribution plates, which play the role of diversion. At the same time, the setting of the upper and lower air distribution plates reduces the falling height of circulating water and slows down The speed of water when it falls to the sump is reduced, thereby reducing the noise of water spraying. There is a certain gap between the upper air distribution plate and the lower air distribution plate, so that the cold air blown by the blower can directly cool the circulating water passing through the packing layer through the gap. , improve the heat transfer efficiency of the cooling tower.

Furthermore, the inclination angle of the upper air distribution plate is 20 to 50°, which ensures that the circulating water can fall into the sump, and at the same time slows down the speed of falling water into the sump.

Furthermore, the inclination angle of the lower air distribution plate is 20 to 50°, which ensures that the circulating water can fall into the sump, and slows down the speed of falling water into the sump.

Furthermore, both the upper air distribution plate and the lower air distribution plate are made of aluminum to further cool the cooling water.

Further, the width of the upper air distribution plate and the lower air distribution plate is gradually widened from the upper end to the lower end, so as to ensure that there is only a small gap between the upper air distribution plate and the lower air distribution plate, so as to prevent circulating water from falling into the air guide On the blower inside the cylinder, the middle is lower than the two sides, so that the circulating water can fall into the sump along the upper and lower air distribution plates, ensuring the diversion of the circulating water.

The beneficial effects of the present invention are:

(1) The structural setting of the upper and lower air distribution plates of the present invention plays a diversion effect on the circulating water, making it return to the sump at the bottom of the cooling tower to prevent the circulating water from falling onto the bottom blower, motor, and reducer. It protects the motor from short circuit and prolongs the service life of the motor and blower.

(2) The structural setting of the upper and lower air distribution plates of the present invention can make the cooling air blown by the fan at the bottom enter the tower, and directly contact with the circulating water for cooling. Water is used for cooling, which improves the cooling efficiency of the cooling tower.

(3) The structural arrangement of the upper and lower air distribution plates of the present invention reduces the water spraying height of the circulating water, thereby reducing the water spraying noise.

Description of drawings

Fig. 1 is the structural representation of cooling tower of the present invention.

Figure 2 is a front view of the air distribution structure.

Fig. 3 is a top view of the air distribution structure.

Fig. 4 is a bottom view of the air distribution structure.

Fig. 5 is a front view of the upper air distribution plate.

Figure 6 is a right side view of the upper air distribution plate.

Fig. 7 is a structural schematic diagram of the connecting plate.

Marked in the figure: 1-cooling tower, 2-filling layer, 4-upper air distribution plate, 5-lower air distribution plate, 6-connection plate, 7-air guide tube, 8-motor, 9-water inlet pipe, 10 - Knuckle, 11-threaded hole, 12-threaded hole, 13-threaded hole, 14-water eliminator, 15-water collection tank.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

The bottom blast cooling tower is mainly composed of a supporting part, a heat dissipation part, a water inlet system, and a water collection system. The air distribution structure of the present invention is not only a heat dissipation part, but also a component part of a water collection system.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, the bottom blowing type cooling tower air distribution structure of the present invention includes the packing layer 2 and the blower ( Not shown in the figure) between the air distribution structure, the motor 8 is connected with the blower below, and the top of the cooling tower 1 is also provided with a water eliminator 14, which is used to remove unnecessary water vapor in the cooling tower 1, and the air distribution structure includes The upper air distribution plate 4, the lower air distribution plate 5, the connecting plate 6, the upper air distribution plate 4, and the lower air distribution plate 5 are all air distribution plates whose width gradually widens from the upper end to the lower end and the middle is lower than the two sides. Specifically, the upper air distribution plate 4 and the lower air distribution plate 5 can be set as trapezoidal and arc-shaped air distribution plates, and the upper air distribution plate 4 and the lower air distribution plate 5 can be made of materials with better heat transfer coefficients. As, preferably, aluminum can be used to increase the contact area between the circulating water and the heat transfer medium, and improve the heat transfer efficiency; the upper and lower air distribution plates 5, the connecting plate 6, and the air guide tube 7 form a semi-closed space, Isolate the blower and motor 8 from falling water to prevent circulating water from falling on the blower and motor 8; The lower end of the air distribution plate 5 is connected to the air guide tube 7 on the side of the blower, and the lower ends of the upper air distribution plate 4 and the lower air distribution plate 5 are inclined to the side wall of the cooling tower 1. In order to adapt to different working conditions, especially When the amount of circulating water changes, the flow rate of the circulating water can be changed by adjusting the inclination angle of the upper and lower air distribution plates 5 so as to achieve the purpose of controlling the flow, that is, the noise of water spraying is reduced. Preferably, the inclination of the upper and lower air distribution plates The angle is 45°, which ensures the diversion effect.

As shown in Figure 1, Figure 2, Figure 3, and Figure 4, there is a certain gap between the upper air distribution plate 4 and the lower air distribution plate 5. Specifically, the lower end of the lower air distribution plate 5 can be welded to the bottom of the air guide tube 7. On the inner side, the lower end of the upper air distribution plate 4 is welded on the inner side of the air guide tube 7, so that the upper and lower air distribution plates 5 have the same circumferential gap, and the radial gap gradually becomes smaller from the blower to the packing layer 2. The gap The cooling air blown by the blower can be allowed to enter the inside of the cooling tower 1 to cool the circulating water.

As shown in Figure 5 and Figure 6, a 45° knuckle 10 is provided on the upper end of the upper and lower air distribution plates 5, and four threaded holes 13 are set on the knuckle 10, as shown in Figure 7, preferably, the connecting plate 6 is Circular, the connecting plate 6 is provided with inner and outer two circles of threaded holes 11, 12 and the threaded holes on the knuckle 10 are connected by bolts, and each circle of threaded holes on the connecting plate 6 is evenly distributed along the circumference, the purpose is to make A uniform gap is formed between the connected upper and lower air distribution plates 5, and the angle of the knuckle 10 can be adjusted according to different working conditions to meet the needs of different circulating water flow rates of the cooling tower 1. After the upper and lower air distribution plates 5 and the connecting plate 6 are assembled as a whole, the entire air distribution structure does not need to be disassembled, and has a long service life and is easy to clean. When it needs to be used, it can be directly welded to the air guide tube 7 , easy to install and remove.

Specifically, the water inlet system sprays the circulating water from the nozzle evenly downwards through the water inlet pipe 9, and drips onto the packing layer 2. The packing layer 2 cools down by increasing the contact area with the circulating water, and the circulating water flows through the packing layer 2. Then it contacts with the cooling air blasted from the bottom for secondary cooling, and the cooled circulating water falls onto the upper and lower air distribution plates 5, and then along the upper and lower air distribution plates 5, finally falls into the bottom of the cooling tower 1. In the sump 15.

Claims (4)

1. Bottom blast type cooling tower cloth wind structure, its characterized in that: including setting up the wind distribution structure between packing layer (2) and the air-blower of cooling tower (1), this wind distribution structure includes grid plate (4), lower grid plate (5), link plate (6), the upper end of grid plate (4), lower grid plate (5) is along link plate (6) circumference equidistance alternate arrangement, on wind-guiding tube (7) of air-blower week side are connected to the lower extreme of grid plate (4), the lower extreme of grid plate (5) sets up to cooling tower (1) lateral wall slope, have certain clearance between grid plate (4) and the grid plate (5) down, grid plate (4) are grid plate that the width is widened gradually from upper end to its lower extreme down, the centre is less than both sides and transversal arc setting down.

2. The bottom blowing cooling tower air distribution structure of claim 1, wherein: the inclination angle of the upper air distribution plate (4) is 20-50 degrees.

3. The bottom blowing cooling tower air distribution structure of claim 1, wherein: the inclination angle of the lower air distribution plate (5) is 20-50 degrees.

4. The bottom blowing cooling tower air distribution structure of claim 1, wherein: the upper air distribution plate (4) and the lower air distribution plate (5) are made of aluminum.

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