Theoretical and Experimental Study of Chemical Transformations of a Methane–Hydrogen–Coal Particles Mixture in a Rapid-Compression Machine

Abstract

Results of an experimental and numerical study of the ignition of a stoichiometric methane–air mixture in the presence of coal particles of diameters 20–52 μm in the range of temperatures 850–1150 K and pressures 1.5–2.0 MPa are presented. It has been found that the particles begin to burn at a temperature of the oxidizing medium above 850 K. At a temperature above 1000 K, burning particles reduce the time and limiting temperature of ignition of the methane–air mixture. A comparison has been made of the calculated data on ignition-delay times of coal in an air–coal mixture and on ignition-delay times of methane and coal in a methane–air–coal mixture with the experimental data. A satisfactory agreement is shown between the data on ignition-delay times of coal and ignition-delay times of methane in all the mixtures in question.