Abstract
The results of numerical investigation of the ignition of a stoichiometric methane-air mixture in the presence of carbon particles with diameters of 20-52 μm in the temperature range 950-1150 K and pressures of 1.5-2.0 MPa are presented. The calculated data of the ignition delay times of coal particles in the coal particles/air mixture and of the ignition delay times of methane and coal particles in the methane/coal particles /air mixture are compared with the experimental ones. A satisfactory agreement of the data on the coal particles ignition delay times and methane ignition delay times in all the mixtures considered is shown.
Highlights
Investigation of the ignition and combustion of disperse systems consisting of a gas suspension of reactive particles in a mixture of gaseous fuels and oxidizer is relevant from the point of view of explosion and fire safety, for example in the coal mining industry
Let us consider a space filled with the gas suspensions of coal microparticles with the diameters from 26 to 52 microns in air or in methane-air mixture, with high initial state parameters
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]
Summary
Investigation of the ignition and combustion of disperse systems consisting of a gas suspension of reactive particles in a mixture of gaseous fuels and oxidizer is relevant from the point of view of explosion and fire safety, for example in the coal mining industry. 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. Investigation of this phenomenon is interesting from the point of view of controlling the process of ignition of the gas mixture, which can become the scientific basis for creating new combustion regimes for traditional fuels
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