ID#: 52
Abstract Title: To the Theory of Ignition and Detonation of Coal Particle Gas Mixtures
Session Title: Poster Session I
Session Date: 7/31/01
Session Start Time: 2:50 PM
Contributing Author: Fedorov, A.V.
Organization: Institute of Theoretical and Applied Mechanics RAS
Country: Russia
Authors: A.Fedorov, T.A. Khmel', Yu. A. Gosteev
Short Abstract: The urgency of the problem of coal - gas mixture ignition and detonation is caused by this medium wide use as fuel mixture in power facilities and by the problems of the combustion and fire safety in coal-mining and power industries. The mathematical model of ignition of a multicomponent coal aerosuspension is presented within a point-wise approach of mechanics of heterogeneous media. The problem of coal - gas mixture ignition behind a reflection shock wave is solved as an application. The distinctive variants of the mixture thermal history realized under various proportions between relaxation times of nonequilibrium processes are shown: heterogeneous ignition due to coke oxidation reaction, homogeneous ignition by means of gas phase volatiles matters reaction, hybrid ignition due to coke and volatile matter oxidation processes simultaneously. The model verification is realized using the experimental data relating to the ignition delay times of the mixture of the coal particles with air and oxygen under conditions behind reflecting shock wave. The second part of the paper is devoted to the problem of mathematical modelling of detonation processes in coal particle - gas mixtures. The model of detonation of small coal particle aerosuspension is developed taking into account processes of pyrolysis, coal volative matter combustion, and coke combustion. The model is verified by experimental data on the dependence of detonation velocity on initial particle concentration. The stationary detonation structures are analyzed.