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Spouted bed collection of solid aerosols in the presence of electrical effects
Author(s) -
Balasubramanian M.,
Meisen A.,
Mathur K. B.
Publication year - 1978
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450560305
Subject(s) - aerosol , corona discharge , entrainment (biomusicology) , corona (planetary geology) , materials science , analytical chemistry (journal) , chemistry , meteorology , chromatography , electrode , physics , astrobiology , rhythm , acoustics , venus
A spouted bed of 1.7 mm cement clinker particles was previously found to be an efficient collector of liquid micronsize aerosols introduced into the bed with the spouting gas (1) With solid aerosols, however, collection efficiencies obtained were poor since these failed to adhere permanently to the target particles and were re‐entrained. The present paper describes experimental work to overcome the re‐entrainment problem by making use of electrostatic forces. Solid latex aerosol particles (0.79 μm dia.) were electrified by a negative corona discharge and collected in a 15 cm diameter spouted bed of ABS plastic particles (2.5 mm cubes). The variables studied included corona voltage (0 to 9500 V), bed depth (0.3 to 0.5 m) and superficial gas velocity (0.23 to 0.85 m/s). Spouted bed efficiencies with neutral aerosols ranged from 43 to 65% as against 72‐98% with charged aerosols The experimental results are interpreted using the two‐region model of a spouted bed, and invoking an enhancement factor for aerosol mass transfer due to electrical effects. The values of this factor ranged between 160 to 2300 under the conditions studied.