Theoretical investigation of ignition and detonation of coal-particle gas mixtures

Physical and mathematical modeling of ignition of methane-air mixture in the presence of coal microparticles

“…The ignition of coal/air and methane/coal/air mixtures was calculated using the mathematical model [5][6][7][8][9][10][11]. As the particle ignition delay time we consider the time needed to reach the maximum particles temperature rise in time - Fig.…”

“…As shown in [2,3], hybrid mixtures are more easily flammable than each of the components individually. A lot of work has been devoted to a theoretical study of the problem of ignition of coal suspensions (see [4][5][6][7] and references therein). The studies were carried out within the framework of point models of ignition of coal particles, the provisions of the Semenov's thermal explosion theory were widely used to formulate the critical ignition / extinction conditions.…”

“…We assume, as in [5,6], that the processes of thermal destruction of coal particles occurs simultaneously with the release of volatiles into the gaseous phase, the ignition and combustion of volatiles in the gaseous phase, the heterogeneous reaction of oxidation of solid carbon (coke), the ignition and combustion of methane/air mixture. The mass rates of the pyrolysis reaction, oxidation reaction of solid carbon will be described in the form of diffusion-kinetic dependences presented in [5,7]. Kinetic constants for these dependences are presented in [5,8].…”

“…The mass rates of the pyrolysis reaction, oxidation reaction of solid carbon will be described in the form of diffusion-kinetic dependences presented in [5,7]. Kinetic constants for these dependences are presented in [5,8]. To describe the kinetics of ignition and combustion of gaseous volatile and methane/air mixtures we use the simplified detailed kinetic scheme [9].…”

Influence of coal particles on ignition delay times of methane-air mixture

“…As shown in [2,3], hybrid mixtures are more easily flammable than each of the components individually. A lot of work has been devoted to a theoretical study of the problem of ignition of coal suspensions (see [4][5][6][7] and references therein). The studies were carried out within the framework of point models of ignition of coal particles, the provisions of the Semenov's thermal explosion theory were widely used to formulate the critical ignition / extinction conditions.…”