Abstract
Methods are analyzed for decreasing the airborne noise at power plants in the presence of many noise sources. The main sources of noise at thermal power plants (TPPs) and means of their control have been known for a long time and are described in detail in the literature. Despite the apparent knowledge, simplicity, and recognition of the problem, it has not yet been solved at TPPs. Sound levels can exceed the standard limits by as much as 20 dB or more. Cases are known when “low-noise” imported equipment (in particular, gas turbine units) emit elevated noise levels in the rooms of power plants, despite the application of modern acoustic insulation and sound absorption means. There are low-frequency components in the octave bands of 63 and 125 Hz in the noise excess spectrum in the case of poor performance of available soundproofing and sound-absorbing materials. Today, additional low-frequency infrasonic sources of elevated airborne noise with a frequency of several hertz have appeared at TPPs. They are related with the application of many large low-speed fans of dry cooling towers. A soundproof coating is proposed for solving this problem, and experimental confirmation of this option is given. The possibility of reducing noise at low frequencies (starting from 20 Hz) by ten times or more using special low-frequency sound insulation is demonstrated. Correlations for the estimation of its efficiency are given. Laboratory tests of this sound insulation have revealed that a difference in sound pressure levels inside and outside the sound insulation is as great as 30 dB or more in the range above 20 Hz. The design of an acoustic enclosure with holes for equipment air cooling is examined. The possibilities of the application of these structures at thermal power plants and ways for improving their efficiency are discussed. The results of a laboratory experiment on the active suppression of the discrete noise component at 37.5 Hz are reported.
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Funding
The work was supported by the Russian Science Foundation (project no. 21-19-00311 dated April 20, 2021).
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Translated by T. Krasnoshchekova
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Kiryukhin, A.V., Bobrov, S.P., Taran, V.A. et al. Improving the Efficiency of Acoustic Insulation for Power Equipment. Therm. Eng. 69, 925–932 (2022). https://doi.org/10.1134/S0040601522120047
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DOI: https://doi.org/10.1134/S0040601522120047