Panel Bed Filters for Simultaneous Removal of Fly Ash and Sulfur Dioxide:

Abstract

Exploratory trials of three panel bed filters (using 16-30 mesh sand and operating at a face velocity around 12 ft/min) indicated a good probability that such a device can achieve 99% filtration efficiency on power-station fly ash. A “puff-back” technique was used to remove fly ash and a portion of the sand from the gas-entry face of a panel. Based upon the experimental results, a commercial design would appear to provide a gas-treating capacity per unit ground area on the order of four times greater than an electrostatic precipitator of comparable efficiency. The panel bed device also has the power to remove SO2 if a suitably reactive filter solid is provided.