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Analysis of the shock wave ignition and detonation in bituminous coal-dust suspensions
A consistent mathematical model of detonation with regard for the ignition stage in a coal dust suspended in oxygen is developed in the paper. The model is based on two-velocity two-temperature approach of the heterogeneous media mechanics. The nonequilibrium processes of devolatilization and heterogeneous and homogeneous reactions of ignition and combustion are taken into account. The model is verified by the experimental data on the ignition delay times in transient shock waves. The analysis of the ignition process in bituminous coal-dust suspensions behind shock waves shows that the ignition stage in the mixture proceeds under the conditions of both velocity and temperature nonequilibrium between the phases. It is obtained a considerable effect of the particle surface heating due to flow deceleration that determines devolatilization process dynamics and, correspondingly, the ignition delay time. The detonation wave structures reveal relatively short period of ignition delay with respect to duration of the coke residue combustion. Nevertheless, since the velocity nonequilibrium effect plays an important role in ignition then it should be taken into account in investigations of detonation initiation and propagation in gas suspensions of coal particles of high volatile content.
Analysis of the shock wave ignition and detonation in bituminous coal-dust suspensions
A consistent mathematical model of detonation with regard for the ignition stage in a coal dust suspended in oxygen is developed in the paper. The model is based on two-velocity two-temperature approach of the heterogeneous media mechanics. The nonequilibrium processes of devolatilization and heterogeneous and homogeneous reactions of ignition and combustion are taken into account. The model is verified by the experimental data on the ignition delay times in transient shock waves. The analysis of the ignition process in bituminous coal-dust suspensions behind shock waves shows that the ignition stage in the mixture proceeds under the conditions of both velocity and temperature nonequilibrium between the phases. It is obtained a considerable effect of the particle surface heating due to flow deceleration that determines devolatilization process dynamics and, correspondingly, the ignition delay time. The detonation wave structures reveal relatively short period of ignition delay with respect to duration of the coke residue combustion. Nevertheless, since the velocity nonequilibrium effect plays an important role in ignition then it should be taken into account in investigations of detonation initiation and propagation in gas suspensions of coal particles of high volatile content.
Analysis of the shock wave ignition and detonation in bituminous coal-dust suspensions
Mathematische Analyse der Stoßwellenzündung und Detonation in Wolken aus bitumenreichem Kohlenstaub
Fedorov, A.V. (author) / Khmel, T.A. (author) / Fomin, V.M. (author)
Journal of Loss Prevention in the Process Industries ; 22 ; 140-144
2009
5 Seiten, 6 Bilder, 11 Quellen
Article (Journal)
English
Rock dust in bituminous-coal mines during 1930-33
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