INTERACTIONS BETWEEN NO AND VOLATILE MATTER RELEASED BY COAL AND PETCOKE

摘要

Combustion of solid fuels at 800-1000℃ releases fuel NO that may be reduced either by homogeneous reactions with hydrocarbons or heterogeneous char reduction. The solid combustion starts with devolatilisation that releases volatiles, mainly CO and hydrocarbons from hydrogen to tars. A petcoke and a coal are here first pyrolyzed under nitrogen, at different temperatures, using an entrained flow reactor. The gases are sampled and analyzed. Experiments are then undertaken under atmosphere enriched in NO at various temperatures. The NO concentration decreases throughout the process. The relative contribution of homogeneous and heterogeneous NO reduction is then investigated using a numerical model.