Environmental and radiative characteristics of cylindrical Ni-Al burners for LPG combustion

Abstract

This paper presents experimentally studied environmental and radiation parameters of hollow cylindrical burners during operation with LPG-air fuel mixture. Two combustion modes have been examined – an external combustion mode where the flame anchored near the outer surface of the burner, and an internal combustion mode when the combustion takes place in the inner cavity of the burner. The dependences of CO/NOx emissions and radiation efficiency on a firing rate in the range of 160-420 kW/m2, air-fuel equivalence ratio in the range of 1.0 - 1.4, as well as the porous structure of a burner have been analyzed. An influence of a flow deflector installed in front of the burner inlet in order to distribute the flow over the inner cavity of the cylindrical burner on environmental characteristics of the burner is discussed. The necessary condition that ensures CO emission below 50 ppm, NOx emission below 20 ppm and radiation efficiency in the range of 45-55 % is described in the paper.