How to reduce the noise of closed cooling tower

When the closed cooling tower is in operation, obvious noise will be generated due to the rapid fall of the spray water and the rotation of the fan. The noise is mainly caused by the vibration, and the noise of the closed cooling tower mainly includes the sound of water splashing, the noise of the fan and the vibration of the water pump. The influence range of noise resonance of closed cooling tower is very large, which can involve the surrounding 30-50 meters. After adding anechoic tile and sound insulation barrier, it returns to 60-70db. Therefore, the noise effect of closed cooling tower is more serious. And the solution to the noise mainly includes: blocking the noise transmission, increase the sound insulation cotton, replace with low speed fan and other methods.

1. Noise reduction principle of closed cooling tower;

   The noise transmission of closed cooling tower is mainly transmitted by three ways: air, building body and ground. The principle of noise reduction of the cooling tower is to block the propagation path of sound waves. The sound barrier is added around the cooling tower. When the sound meets the barrier, the sound reflection will occur, the greater the distance, the weaker the sound, and the greater the amount of refraction, the lower the decibel of the sound. Because the noise frequency wave produced by water noise and fan and pump sound is not the same, it is best to set the barrier in the noise area of the cooling tower to be close to the cooling tower. 

2. Cooling tower noise reduction barrier selection;

   The barrier required for noise reduction of closed cooling tower should be used according to the situation. More common are brick walls, glass reinforced plastics and aluminum alloys. The brick wall is designed with sand surface, with more noise on the surface, which can reflect the sound from different angles, and the service life of the brick wall is very reliable. The surface of aluminum alloy and FRP is relatively smooth, so a certain arc surface should be designed, reflect the sound downward as much as possible. The floating falling water energy dissipation and noise reduction device mainly consists of plastic parts or glass fiber reinforced plastic parts (stressed parts) formed by extrusion, injection molding or hot-pressing. Its material characteristics are lightweight structure, easy to handle, easy to install, anti-corrosion and durable.

3. Noise reduction techniques for fans and pumps;

   Fans and pumps are also the main sources of noise. The wind noise from the high-speed rotating fan is very loud. If it is only for the fan noise treatment, can be used to increase the air volume, reduce the speed of the method to achieve. Increase the air volume, can increase the fan page arc Angle. If the budget is sufficient, you can consider directly replacing the wind blade fan with low speed to reduce the noise. Or in the water pump and fan tuyere installation muffler screen, muffler screen noise reduction range of 20-30 decibels. The water pump can be designed on the outside of the water pump sound-proof cotton, sound-proof cotton can be very effective in reducing noise, and will not affect the heat dissipation of the water pump.

If the closed cooling tower is designed outdoors, the above methods are mainly used for noise reduction. If the cooling tower is designed indoors, the indoor design can be sound insulation treatment. Designed indoors, acoustic coatings can be used. In the process of designing the noise reduction of closed cooling tower, the ventilation and heat dissipation of the cooling tower should be considered. The designed sound insulation barrier and sound insulation cotton should not affect the ventilation of the cooling tower. The main transmission way of the dill sound of the closed cooling tower is also through the fan's fan. The cross-flow cooling tower has only one side air inlet, and the counter-flow cooling tower has an inlet grille around the bottom of the tower. The dill sound and the inlet wind form convection, which can reduce the noise propagation.

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