Noise Control Measures for Pulverised Coal Mill

The proportion of the power plant using pulverized coal combustion is larger. Coal grinding is a necessary part of the flour milling system. Qualified pulverized coal and coarse powder are separated by separator after the implementation of coal grinding. The qualified pulverized coal discharge with the air instead of returning the pulverised coal mill to grind again in order to reduce the coal mill load and reduce the influence to the mill output. At the same time, coarse particles larger than a certain grain size were separated and return to the mill not affecting the combustion efficiency of the boiler.

Pulverised coal mill is mainly used in the coal industry, most of the tube mill and coal mill users reflect that mill produced a lot of noise when working. High noise in the use of the mill not only pollutes the environment but also seriously endangers the physical and mental health of the operation and maintenance personnel, so reducing mill noise has become one of the important research topics of noise and vibration control at home and abroad. Pulverised coal mill noise mainly comes from the following aspects (1) Mechanical noise caused by collision between steel balls, steel ball and a cylinder body, a steel ball and materials. (2) Mechanical transmission gear noise of a gear transmission part. (3) Electromagnetic and platoon wind noise generated by the motor's. The first noise is the main noise source.
How to reduce the noise in the work of the pulverised coal mill is very important. Here are two suggestions.
1 Reducing sound source noise of pulverised coal mill. There are a lot of methods to reduce the noise from the sound source, But the control method of the dry type high temperature tube mill can be adapted to the thermal power plant are follows: Damping vibration noise on the cylinder processing; laying elastic buffer between the inner wall of the cylinder and the lining plate; introducing floating lining board technology.
2 Control the noise through the noise transmission path. To develop a good fixed sound insulation cover or assembly type sound insulation cover which have good sound insulation effect.
The control of noise is an important and indispensable part in the whole noise control field. But such measures do not relate to the transformation of the source of noise, and therefore can not be considered as a positive measure and sometimes bring inconvenience for operation and maintenance of equipment. The most direct, effective and economical measure for noise control of the pulverised coal mill is to reduce the noise. So it is the development trend of the research on the noise control of the pulverised coal mill to reduce the noise from the noise source itself.