Optimization of Noise Prediction Method and Discussion on Noise Control Measures for High-level Water Collecting Natural Draft Wet Cooling Tower
A noise measurement is conducted for a High-level Water Collecting Natural Draft Wet Cooling Tower(HNDWCT)of a 660 MW coal-fired unit in Hubei province.The noise prediction method for HNDWCTs is optimized and verified based on the measurement.Noise control measures for HNDWCTs is also discussed.The results show that the optimized prediction method using a horizontal plane sound source at the noise position has better accuracy to predict the noise influence of HNDWCTs than the conventional prediction method using a vertical one.Although the measured noise level near the ground is 8 dB(A)lower than that of a Usual Natural Draft Wet Cooling Tower(UNDWCT),the reduction of sound power level(LW)by using the HNDWCTs could not reach 8 dB(A).Instead,for some special measuring points outside the boundary wall,the noise influence of HNDWCTs could be greater because of the higher source position.In terms of the noise control measures,the sound elimination diversion sheets and the noise barriers,which are generally applied for UNDWCTs,should be optimized and verified based on the actual situation of the sound source.And the noise source reduction measures could be studied from the aspects of improving the impact of water droplets on the inclined plate and the vibration noise of the inclined plate itself.
High-level Water Collecting Natural Draft Wet Cooling Tower(HNDWCT)noise influencenoise predictionnoise control
万方数据
维普
