The press gas of the filter press of Dongqu Coal Preparation Plant instantaneously emerged during the venting stage, which was equivalent to the release of pressure from the pressure vessel. The noise was large and lasted for a long time, which was harmful to the physical and mental health of the workers, and also made the production environment dirty. In response to this situation, the research and design of noise reduction facilities, the use of traditional filter-type silencer and expansion silencer combined noise reduction principle, reduced the noise situation of the plant in the production process, improved the work experience of personnel, effectively controlled the discharge of sewage pipelines that environmental pollution caused.