Abstract
Limestone incorporation to coal feed during coal atmospheric fluidized bed combustion (AFBC) to control legislated emissions promotes the polyaromatic hydrocarbon (PAH) emissions. This is a fact that has been corroborated working in a laboratory pilot plant at the same conditions used at the coal FBC power stations. PAH emissions increase one order of magnitude but, is it due to a Ca catalytic effect or is it due to limestone is a porous material?The aim of this work was to check the role played by limestone and it is concluded that, at the working conditions, the PAH emissions promotion is due to the limestone porosity. No Ca catalytic activity was found at the coal AFBC standard conditions.
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