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Reactive silencers
The Howden family of attenuators, or reactive silencers, has been developed specifically for applications where dust or moisture affect the attenuation properties of conventional absorptive silencers.


Conventional absorptive silencers have been used successfully over the years to handle clean air. However they do not perform as well in gas streams containing particulate matter and moisture as the absorptive material deteriorates and plate perforations become blocked.

Howden has developed a range of reactive silencers that are ideally suited for use with contaminated air and gases, or where there is moisture carry over. 

 


Standard features 
Our pure reactive silencers are based on the Helmholz resonator principle, and have a series of tuned resonator cavities that attenuates excessive and unwanted noise. Since there are no perforated plates or absorptive material that can deteriorate, the silencer will operate over the life of the plant with minimum maintenance. Equipment we installed over 25 years ago is still within the original specified aerodynamic and acoustics limits. Our reactive dissipative attenuators provide a lower cost alternative for handling contaminated air and gas streams. They incorporate reactive chambers for attenuation of specific frequencies and absorptive fill material for broadband attenuation. The downstream faces of the chambers are lined with absorptive fibreglass material to reduce broadband noise. The fibreglass is situated out of the air stream, shielding it from contamination by particulate matter.


Howden reactive dissipative attenuators provide a lower cost alternative for handling contaminated air and gas streams by incorporating both reactive chambers for attenuation of specific frequencies and absorptive fill material for broad band attenuation.

The splitters consist of a series of tuned acoustic chambers. Sound waves corresponding to the design frequencies are reflected out-of-phase to the incoming sound waves. As the reflected and incoming sound waves are directly opposite in their wave patterns, they have a cancelling effect on each other, reducing noise levels.

The upstream faces of the chambers are lined with absorptive fibreglass material to reduce broadband noise. The fibreglass is situated out of the air shielding it from contamination by particulate matter.

Detailed specifications

Long service life
Non-fouling design
Minimum maintenance
Easy cleaning
Low pressure drop
Flexibility of design
Suitable for high temperatures
Broad attenuation range
Available in various materials
Applications

Induced draught fan system
Contaminated gas streams
Saturated gas streams
Corrosive gas streams
High temperatures
Steam vent systems
Mine ventilation
Spare Parts

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