1. Analysis of noise source of cooling tower

Cooling tower is a kind of heat exchange equipment, its noise source mainly has three aspects:

1. Cooling tower fan noise

It is mainly divided into the mechanical noise of the cooling fan and the aerodynamic noise of the fan inlet and exhaust, and the characteristic is low frequency. The fan installed in the upper part of the cooling tower is mainly drawn out in reverse to achieve the purpose of cooling. The high-speed rotation of the fan will produce aerodynamic noise. The multiple blades in the rotation act on the air flow, and then cause the air pressure and movement speed to fluctuate. The imbalance of the rotating parts will cause the structure to vibrate, resulting in vibration noise. .

2. The noise of falling water in cooling tower

The circulating water of the cooling tower flows down from the upper spray pipe and will generate impact noise through the free fall, which is proportional to the square of the falling speed and inversely proportional to the fourth power of the impact water surface.

3. Cooling tower body noise

The noise of cooling tower machinery mainly comes from the vibration of machine parts. The parts of the machine will be elastically deformed during the work, and then generate vibration. When mechanical components with elasticity propagate vibration energy to the radiating surface, they will propagate out through the air, forming mechanical noise.

The comprehensive cooling tower noise control plan is mainly: the installation of a silencer at the outlet of the fan can effectively prevent aerodynamic noise; the installation of sound absorption and insulation barriers around the cooling tower to effectively reduce the water spray noise and mechanical noise; the installation of air inlet muffler shutters at the air inlet , It can ensure that the cooling tower can effectively control the noise propagation while normal ventilation and heat dissipation.