The report gives results of a pilot scale investigation to determine the technoeconomic feasibility of applying a fabric filter dust collector to coal fired industrial boilers. The pilot facility, on a slip stream of a 60,000 lb/hr boiler, was capable of handling 11,000 acfm at an air-to-cloth (A/C) ratio of 6/1. Filter media evaluated were Nomex felt, Teflon felt (two styles), Gore-Tex, and Dralon-T. Fractional efficiency was determined using an Andersen inertial impactor for the four filter media at three A/C levels. The effect of reverse air volume on outlet loading and pressure drop across the bags was evaluated for Nomex felt. Nomex felt achieved the lowest outlet dust concentrations while Teflon felt operated at the lowest pressure drop. All media tested achieved outlet loadings well within allowable limits. Higher collection efficiencies were achieved with Nomex felt by discontinuing reverse air cleaning. Increasing the amount of air used for cleaning does reduce the pressure drop across the bags. Installed annual operating and total annualized costs for a fabric filter and an electrostatic precipitator, capable of handling 70,000 acfm of flue gas from a coal fired boiler, are presented.

Performed by Enviro-Systems and Research, Inc. under EPA contract no. 68-02-1093, ROAP no. 21ADM-033, program element no. 1AB012. "August 1975." "EPA/650-2-74-058a." Project officer: James H. Turner. Includes bibliographical references.