Characterization and Activity of Different Dolomites for Hot Gas Cleaning in Biomass Gasification

Abstract

The aim of this work is to identify if the type, origin or composition of the calcined dolomite has some influence on its activity for tar elimination in a hot flue gas coming from a biomass gasifier, bubbling fluidized bed type. For this purpose four different dolomites from four different quarries and Companies have been studied. Chemical analysis, adsorption isotherms, surface and pore size distributions both with nitrogen and by mercury porosimetry, etc,... have been made for three different samples of each dolomite. Activity tests for fresh tar destruction have been simultaneously carried out for each type of calcined dolomite in a fixed bed of 6 cm i.d. The tar elimination activity of the dolomite and the product distribution from it seem do not depend much on the composition or type of the dolomite used.