Abstract
This paper presents experimental results obtained with a prototype of wet electrostatic scrubber suitably designed to remove fine and ultrafine particles from exhaust gases. Experiments were carried out on a model combustion gas containing particles with diameters from 10 to 450nm, which can be negatively charged in a specially designed corona charging unit. A full-cone spray nozzle with induction electrode was used to generate positively-charged water droplets (5% of the Rayleigh limit) with a mean diameter of about 290μm. The particles removal efficiency was determined for different magnitudes of electric charges on particles and droplets and for two values of liquid-to-gas ratio, equal to 0.88 and 1.15. The experiments revealed that when both particles and droplets were left uncharged, the removal efficiency was very small. When only droplets were charged, the efficiency was of about 35% in number. The highest efficiency, overcoming 91%, was achieved when both particles and droplets were oppositely charged.
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