Abstract
The conversion of a 650‐MW power station unit from oil to coal included conversion from forced to balanced draft boiler operation and the addition of two induced draft fans rated at over one million CFM each. The fans required 25 dB tonal noise reduction to meet nondegradation noise criteria. Two tuned reactive/absorptive discharge duct silencers were purchased. Detailed performance tests were required in the purchase specification and were conducted on a prototype silencer to assure the manufacturer's guarantee would be met. Several performance indices were measured: insertion loss, noise reduction, attenuation, and pressure drop. Narrow‐band frequency analysis was utilized. Community noise measurements were made following silencer installation. They indicated the silenced fans were inaudible.
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