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Mathematical modeling of the heat treatment and combustion of a coal particle. IV. Ignition stage
Authors:Kh. Enkhjargal and V. V. Salomatov
Abstract:
The present paper is the continuation of the previous publications of the present authors in the Journal of Engineering Physics under the general title in which three sequential stages of the thermal preparation of a carbon particle for combustion are considered: heating, drying, and the yield of volatiles. The present paper is devoted to a detailed investigation of the stage of ignition of a carbon particle under the conditions of external radiative-convective supply that most adequately reflects the furnace medium. The characteristics of thermal ignition of a carbon matrix were studied with the aid of the adiabatic method. Such parameters as time and the heating temperature, the time of induction, the total time and the temperature of ignition of a carbon particle, the scale temperature, etc. have been found. The degree of dependence of the time of ignition on the initial temperature of the particle, the temperature of the external medium, heat transfer coefficient, and other inlet data has been analyzed.
Keywords:
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