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MODELING POWDERED SORBENT INJECTION IN COMBINATION WITH FABRIC FILTER FOR THE CONTROL OF MERCURY EMISSIONS ABSTRACT

By Joseph R. V. Flora, Richard A. Hargis, William J. O’dowd, Henry W. Pennline and Radisav D. Vidic

Abstract

A two-stage mathematical model for mercury removal using powdered activated carbon injection upstream of a baghouse filter was developed, with the first stage accounting for removal in the ductwork and the second stage accounting for additional removal due to the retention of carbon particles on the filter. This model incorporates key mass transfer and equilibrium processes that govern adsorption of mercury vapors on activated carbon in the duct and on the fabric filter. Most of the kinetic parameters were estimated from literature correlations and manufacturers specifications, while adsorption equilibrium parameters were determined by fitting the model to a set of experimental data obtained from a pilot-scale coal combustor system. Predictive capability of the model was demonstrated using experimental measurements on the same pilot-scale system. The model shows that removal in the ductwork is minimal, and the additional carbon detention time from the entrapment of the carbon particles in the fabric filter enhances the mercury removal from the gas phase. A sensitivity analysis on the model shows that mercury removal is dependent on the isotherm parameters, the carbon pore radius and tortuosity, the carbon to mercury ratio, and the carbon particle radius

Year: 2012
OAI identifier: oai:CiteSeerX.psu:10.1.1.212.443
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