The operation of thermal power facilities is associated with the negative impact on the environment and humans of such factors as air, water, soil pollution, electromagnetic radiation, and noise. This article is devoted to improving the noise reduction efficiency of gas and air paths of boilers of thermal power plants. In world practice, to reduce noise in gas-air ducts, dissipative noise silencers are used. The authors propose a new design of sound attenuation elements for dissipative plate-type silencers. The article defines the acoustic and aerodynamic characteristics of noise silencers with new sound attenuation elements. We compare the characteristics of silencers made of new silencing elements and the characteristics of silencers consisting of plates of common design with flat surfaces of the side walls, and demonstrate an increase in acoustic efficiency and a decrease in pressure loss when using the proposed new silencing elements in noise silencers. Recommendations on the use of dissipative plate-type silencers with developed sound attenuation elements for gas-air paths of boilers are given.

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During exploitation of heat exchange equipment, the inner surface of tubes is exposed to the working environment negative effects, that leads to corrosion, abrasion and destruction. Currently, an urgent task is to develop a technology for recovery and protection of heat exchange tubes without complete replacement of the tube bundle, that will allow to reduce repair costs and improve the heaters’ efficiency. Existing devices for applying protective coatings have a number of flaws: bulkiness, low mobility, the need to use a 380 V network, the inability to use photopolymers. All these factors limit possibility to use these methods and devices. In order to eliminate such drawbacks, the present work developed a special device, allowing to protect and restore damaged surfaces of heat exchange tubes.

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