РАЗРАБОТКА И ИССЛЕДОВАНИЕ УЛЬТРАЗВУКОВОГО КОАГУЛЯТОРА, ОСНОВАННОГО НА ВИХРЕВЫХ АКУСТИЧЕСКИХ ПОТОКАХ

Abstract

The paper presents a new method and design of gas cleaning equipment, consisting of an ultrasonic coagulator providing increased efficiency in separating particles smaller than 2.5 μm from the gaseous medium and a cyclone for subsequent capture of coarse particles at the coagulator outlet. An increase in the efficiency of particle trapping is achieved through a combination of two acoustic mechanisms: exposure in a standing wave and the formation of vortex acoustic flows. For the practical implementation of the ultrasonic coagulator, a flat flexural-oscillating disk radiator was used. It has been experimentally revealed that when the size of the air gap between the radiator and the reflector is a multiple of half the wavelength, vortex acoustic flows are formed in it. In this case, dispersed particles are involved in oscillatory motion, and the particles are repeatedly redirected along the gas flow lines. This provides a local increase in the concentration of dispersed particles in the peripheral region of the vortex and their mutual movement within the nodal regions and between them. The results of the experimental studies have shown that the combined action of two acoustic mechanisms provides an increase in the probability of collision of particles and their residence time in the ultrasonic field. The experiments performed have shown that the efficiency of capturing 2.5 µm particles by the developed gas cleaning equipment increases from 50% to 96%.