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Methane/coal dust hybrid explosion is one of the common hazards in processand mining industries. In this study, methane detonation propagation in dilutecoal char particle suspensions is studied based on Eulerian-Lagrangian method.The effects of char combustion on methane detonation dynamics are focused on.The results show that propagation of the methane detonation wave in coalparticle suspensions are considerably affected by particle concentration andsize. Detonation extinction occurs when the coal particle size is small andconcentration is high. The averaged lead shock speed generally decreases withincreased particle concentration and decreased particle size. Mean structureand interphase coupling of hybrid detonation are analysed, based on the gas andparticle quantities. It is found that char combustion proceeds in the subsonicregion behind the detonation wave and heat release is relatively distributedcompared to that from gas phase reaction. The mass and energy transfer ratesincrease rapidly to the maximum near the reaction front in the induction zone.Moreover, for 1 {\mu}m particles, if the particle concentration is beyond athreshold value, detonation re-initiation occurs after it is quenched at thebeginning of the coal dust suspensions. This is caused by hot spots from theshock focusing along the reaction front in a decoupled detonation and theseshocks are generated from char combustion behind the lead shock.

Effects of dilute coal char particle suspensions on propagating methane detonation wave