Abstract
The article analyzes the features of noise emission from high-capacity mechanical-draft cooling towers. Dry cooling towers equipped high-speed fans of the FANS and AVG types, and wet cooling towers equipped with low-speed fans of the VG-104 type are considered. To analyze the noise impact produced by mechanical-draft cooling towers, a thermal power plant mathematical model was developed in the Acoustics Computerized Workplace computer program, and acoustic calculations were carried out. In performing acoustic calculations, a change in the power plant output from 116 to 464 MW was considered. The sound level (SL) and sound pressure level (SPL) dependences are constructed for different power plant outputs in using various types of mechanical-draft cooling towers, and the noise emission features from the used fans are analyzed. It has been found that in the case of using high-speed fans, the maximum values by which the sound levels exceed their standardized value can make 9–20 dBA depending on the power plant output. In the case of using low-speed fans, no excess of sanitary standards is observed at the design points over the entire power variation range. It has been shown that mechanical-draft cooling towers equipped with high-speed fans are noisier than those equipped with fans driven by low-speed motors (by 21-27 dBA depending on the plant power and type of the high-speed fan used). Matters of tiered noise emission from high-speed fans are considered. Maps with a height of 100 m with noise level isolines have been constructed, and the tiers of the considered cooling towers with the largest contribution of noise to the design points have been determined.
Published Version
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