Abstract
Electrostatic and ultrasonic precipitators have been put to good use in many industries in the manufacture of iron, cement, nonferrous metals, petrochemicals, cellulose, etc. However, the efficiency of using dust collectors based on externally applied fields (electrostatic and ultrasonic) varies widely with physicochemical behaviour of an airborne particulate system. The capture efficiency of airborne particulates of different type is influenced by the precipitation device design. The fact that suspended aerosol particles are polysized and their precipitation rate in the air stream is different, also poses a special difficulty. In these days, the capture efficiency of aerosol particulates is under improvement through combining several kinds of exposure applied to aerosol particulates at a time.
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