Abstract
Some trouble of low frequency vibration had been occurred at the new refuse incineration plant. Low frequency noise and vibration were induced around the forced draft fan when the draft fan was operated in the condition of low flow rate by controlling the floe valve. It was practically estimated with depending on the result of some measurements and analysis on the site that the acoustic resonance in the air supply duct and the vibrant resonance on the delivery silencer were excited by the low frequency pulsation of the discharge flow from the centrifugal fan. This trouble has been resolved by the reinforcement of the silencer and by the additional set up of the returning by-pass duct from the outlet to the suction side of the fan. It would be the next stage problem for solutions that mechanisms of low frequency pressure fluctuations induced by the special fan with high pressure and wide range of flow rate are made clear.
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