DEVELOPMENT AND RESEARCH OF A NEW METHOD OF GAS CLEANING FROM PARTICLES LESS THAN 2.5 MICRON IN SIZE

Abstract

The relevance of the research is caused by the lack of effective methods and means of combating atmospheric pollution with particles less than 2,5 microns in size. The ultrasonic effect used for these purposes does not allow ensuring the degree of coarsening of dispersed particles sufficient for their sedimentation or capture by the existing gas cleaning equipment. Experimental studies show that even at the maximum sound pressure level (above which the reverse process – the dispersion of drops or the destruction of particle agglomerates – is initiated), the efficiency of ultrasonic coagulation is insufficient, especially at a low counting concentration of particles. This necessitates the identification of new physical effects and the development of new methods of ultrasonic exposure, providing an increase in the efficiency of coagulation of fine particles. The main aim: development of a method for increasing the efficiency of ultrasonic coagulation of particles less than 2,5 microns in size due to emerging vortex acoustic flows in a thin air gap between the emitter and the reflector and a device for its implementation. Results. The authors have proposed a new method and device for cleaning gases from dispersed particles less than 2,5 microns in size by increasing the time of ultrasonic action on each particle and creating zones of local increase in the concentration of fine and submicron particles. This is provided by the formation of vortex flows between the emitting (in the form of a flexural-vibrating disk) and the reflecting surfaces. A local zone of increased concentration of particles is formed in the peripheral region of the vortex, due to the drift of particles under the action of centrifugal particles from the central region of the vortex to its periphery. The proposed method provides the increase in efficiency from 13 to 50 %, depending on the initial concentration of dispersed particles.

Keywords

• ultrasonic
• ultrasonic coagulation
• radiator
• vortex flows
• aerosol