Emission Control of Particles and Gaseous Pollutants with a High-Temperature Granular Bed Filter

Abstract

The combined collection of fine dusts and the sorption of gaseous pollutants at high temperatures have been experimentally and theoretically investigated. The results of the fractional separation efficiency measurements and the experimentally determined breakthrough curves have revealed that excellent SO2 and HCl sorption characteristics exist under conditions which also yield high particle collection efficiencies. New concepts have been developed to describe the measured fractional collection efficiency curves in the inertia dominated size range, which are based on particle trajectory calculations using a simple flow model. During the sorption, conversions of over 80% can be achieved when using a reactive bed consisting of pellets agglomerated from fine limestone particles. The application of such beds in a counter-current mode can even yield solid conversions of nearly 100%. The mathematical prediction of the conversion time behaviour under differential conditions and the breakthrough characteristics in a fixed bed are in reasonable agreement with the experimentally measured data.