Abstract
Pulverized coal particles experience devolatilization processes during their early stages of combustion in a furnace. The volatile matter released from the particles affects the ignition, flame stability, and pollutant emission of pulverized coal combustion. The particle devolatilization rates are strongly dependent on the particle temperature; the instantaneous particle temperature is influenced by the turbulent gas fluctuation. Thus, it is necessary to explore further the effects of gas temperature fluctuation on the instantaneous devolatilization of pulverized coal particles. For most pulverized coal particles burning in a furnace or combustor, rapid devolatilization and fast release of volatiles occur usually when the particle temperature reaches 1000-1200 K. The instantaneous particle devolatilization processes are numerically computed for this temperature range. The particle under investigation is a single one suspended in a hot gas. A fixed relative velocity between the particle and the gas flow is assumed. The gas flow has a uniform but fluctuating temperature.
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