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RESEARCHES ON AIR PURIFICATION USING ULTRASONIC FILTERS

Conf.dr.ing. Nitoi Dan Florin, Prof.dr.ing. Amza Gheorghe, Prof.dr.ing. Semenescu Augustin, Conf.dr.ing. Chivu Oana Roxana, Sef lucr.dr.ing. Amza Zoia

Abstract

The paper presents the need for the purification of polluted air from the highly polluting processing technology of an industrial shop. (paint shops, foundries, welding constructions, forging, etc.). The advantages of using ultrasounds in the pollutant air filtration and purification process and an ultrasonic filter designed are presented. The main computational and construction elements of the ultraacoustic system used in the design of the air filter are presented in the paper. Paper insists in the design of the main part of the ultrasonic system represented by ultrasonic transducer. In this case, the transducer that is used consist in two asymmetrical passive elements (reflector and radiant element). The design steps and calculating elements taken in the analysis are: the mechanical resonance condition; the electromechanical resonance condition; the acoustic power emitted by the resonance; acoustic power emitted at low frequencies; the acoustic power frequency characteristic; the electrical impedance of the transducer; electro-acoustical, acoustical- mechanic and electromechanical efficiency; the sensitivity of the low frequency transducer; the transducer sensitivity frequency characteristic and the resonance sensitivity of the transducer. Experimental researches have shown an increased efficiency of using this type of filter (retention of microparticles larger than 1.0 ?m, smoke retention and increase of duration of filter operation more than 3 ... 5 times).

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DOI resolver: doi.org/10.5593/sgem2017h/43/s19.061

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