Using Reactive Silencers for Noise Protection

Aerzen uses reactive silencers to reduce the noise produced by screw compressors, positive displacement blowers and rotary lobe compressors at the gas discharge outlet. These are much better in many ways compared to the traditional dissipative silencers.

Aerzen Delta screw compressor models may produce noise at 170 to 190 dB, which means the use of a downstream silencer is mandatory. These sound waves also have a high frequency which leads to damaging vibrations of the pipelines and insulation materials within dissipative silencers used to damp the noise.

This micro friction thus degrades the silencer material with time and even stainless steel is eventually worn down, making the silencer less effective and producing fine particles by erosion. These may lead to process air contamination which could compromise hygiene in food production lines or block the tiny aeration pores of the aeration elements in the respective basin of wastewater treatment facilities.

To prevent this, downstream filtration must be provided, causing loss of pressure, poor efficiency, and increased energy usage, and altogether the cost of maintenance will go up.

Neutralization, not Absorption

Aerzen has brought out a line of patented reactive silencers (EP1857682) which reduces noise without causing any of the issues mentioned above. It consists of a specially designed piping system which creates a noise set to a defined level. This counter-noise is meant to superimpose the sound waves from the exhaust or compression outlet with a phase delay, leading to complete phase neutralization.

The length and diameter of the pipes in such a system require careful design depending on the sound source. Aerzen has accomplished this task with perfect mastery and has assemblies of pipes tailored for each process gas conveying system, with the silencer being supplied on its own as standard.

The success of this design has led Aerzen to fit even direct screw compressors with reactive silencers. These silencer modules are perfectly tuned for the application, never erode, do not require maintenance, and comply with international standards PED and ASME.

This silencer design is a proactive method to reduce noise emissions, meeting ATEX and TUV standards. Even in emergency situations, sparking in the danger zone is prevented with the use of an inbuilt spark arrester. This means the client need not install any spark arresters at all, which is a big advantage. Aerzen’s subsidiary Emmerthaler Apparatebau is in charge of manufacturing these vital parts, which allows for great adaptability and high quality, enabling them to meet all types of client requirements.

This information has been sourced, reviewed and adapted from materials provided by Aerzener Maschinenfabrik GmbH.

For more information on this source, please visit Aerzener Maschinenfabrik GmbH.

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