Abstract
An electric utility was receiving complaints about noise from their power plant from residences nearly 2 miles away. An onsite and off-site noise survey confirmed the neighbors complaints, and indicated that the sound was coming from the plant ID fans via the stack. Most of the complaints occurred when the plant went to low load at night. A study was therefore undertaken to determine how the fan sound level varied with plant load. A simple, reliable, and inexpensive means was sought to make repeatable fan sound pressure level measurements without penetrating the stack. Both narrow-band and 1/3-oct band measurements were taken from fixed and scanned microphone locations at the fans, in the stack annulus, and on the boiler roof during boiler ramp ups and ramp downs. A sampling methodology was developed with a high degree of precision allowing reliable measurements of ID fan blade pass frequency tone level versus plant load. Subsequent noise measurements evaluated modifications to the fan inlet, cutoff, blade tips, and fan speed with a relatively high degree of precision.
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