Flue gas silencers

A constant source of noise with a strong impact on the surrounding area is air and gas duct systems, through which noise is radiated from gas turbines, draft and forced-draft machines, or generated by combustion processes.

 

Among power equipment, gas turbine units (GTUs) are one of the most powerful sources of continuous environmental noise.

 

The noise emitted by the GTU exhaust system is caused by the combustion process, the high velocity of gases passing through the turbine flow path, and gas flow turbulence. Low-frequency noise is the most difficult to mitigate.

 

The most effective way to reduce exhaust gas noise is the installation of special devices—flue gas silencers.

 

Flue gas silencers consist of one or more sections made up of rows of special devices (cassettes) of circular or rectangular cross-section, evenly spaced from each other. Basalt superfine fiber is used as the sound-absorbing material (SAM); it has high sound absorption and hygienic properties and is protected on both sides against blow-out by fiberglass (basalt fabric) and perforated sheets or mesh. To reduce aerodynamic resistance, special devices—fairings—are installed at the ends of the cassettes.

 

The operating principle of the silencer is based on partial attenuation and modification of acoustic vibrations as the air flow passes through the sound-absorbing material.

 

Installation of flue gas silencers makes it possible to reduce sound pressure levels to sanitary standards established by the relevant regulatory documents.