Two-Dimensional Experimental Study of Superadiabatic Combustion in a Packed Bed Burner

Abstract

High-efficiency use of low-concentration coal mine methane is favorable for energy savings and the reduction of greenhouse gas emissions. During the porous media combustion, abundant methane at extremely low concentrations will be used not through stable combustion, but through superadiabatic combustion, which transmits flames to the downstream. To study the superadiabatic combustion of low-concentration methane intuitively, we set two-dimensional (2D) temperature measuring points in the burners, extended the temperature measurements via a radial basis function (RBF) to the entire burner, and plotted a 2D temperature distribution. The effects of working conditions, pellet diameter, and burner length on the superadiabatic combustion of low-concentration methane then were investigated. The results show that unstable phenomena such as flame rupture and inclining occurred during the combustion wave propagation in the porous medium. The effects of the heat dissipation through burner walls and the heat dissipat...