Abstract
Devolatilization of two eastern bituminous coals was studied under rapid heating conditions (∼104 K/s) in an entrained flow furnace. Experiments were conduced overa range of thermal flux conditions by varying the composition of the coal entraining, medium. Observed pyrolysis rates were dominated by the that transfer characteristics of the entraining gases. Experimental and numerical evidence presented illustrates the role of thermal transport during devolatilization. Chemical kinetic and certain and certain mass ransport mechanisms are intrinsically coupled with the thermal transport process. Coal particle temperatures therefore are a function of the heat flux and the instantaneous pyrolysis rate, with the rate being exponentially coupled to the temperature. This coupling obscures the resolution of coal particle-temperature history and complicates the interpretation of devolatilization behavior. It is suggested that relatively large discrepancies in reported devolatilization rates arise because, in general, no provisions are made to account for coupled chemical, mass, and thermal transport processes.
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