Oscillating combustion of different fuel types for NOX reduction in grate furnaces and coal burners

Oscillating combustion is a method to reduce NOX emissions and is to be understood as a time-resolved staged combustion where either the fuel or the secondary air supply is oscillated. These two operating options with oscillating combustion have been the focus of the research group behind this paper for several years. In this work, experimental investigations of an oscillating air supply demonstrate nitrogen oxide reductions in the combustion of hard coal, lignite, wood pellets and waste wood chips by up to 35 %. Investigations were carried out in a test facility for pulverized fuel called BRENDA, in a laboratory fixed bed reactor called KLEEA and an industrial vibrating-grate firing system.