MEGA2003.doc-AlliedEnvironmentalTechnologies,Inc.docVIP

Multi-Stage Collector Development Paper # 9 Henry V. Krigmont, QEP Allied Environmental Technologies, Inc. 15182 Bolsa Chica Road, Suite D. Huntington Beach, CA 92649 USA Abstract The Multi Stage Collector (MSC?) concept for ultra-fine particulate control offers significant improvements over current state-of-the-art technology. The new MSC? design provides a synergistic combination of both single- and two-stage electrostatic precipitation while incorporating an additional collector-stage by filtering the gas exiting the collector through a barrier collector-zone. This arrangement ensures that essentially all dust would be detained in this final stage. The MSC? contains multiple narrow and wide zones formed by parallel corrugated plates. Enclosed in the narrow zones are discharge electrodes. These electrodes provide a non-uniform electric field leading to corona discharge. The corona discharge causes particulate matter in the gas flow to become charged. Wide regions contain barrier filters thus creating the two-stage precipitator with relatively uniform electric field. In these regions, particles are collected on both plates and on the porous barrier elements, which also act as the final filtering stage. Results of the applications analyses and future development work are discussed. The gas flow analyses with an aid of the CFD model are presented below. Introduction Ancient Romans used perforated plates of silver and bronze to strain wine for their wealthy merchants; and filtered it for the poor through linen or other fabric. The Chinese, too, apparently knew something about filtration for they sipped the heady nectar of grape as far back as 2000 B.C.; and it is certain that long before that time the prehistoric Cro-Magnon, the tall erect men who lived in the caves of Dordogne in France and in other parts of Europe, enjoyed purified water. Thus, the straining of liquids as well as filtering air and gases to hold back solids is a very old story. It is well