| OCR Text |
Show The combustion model, COMO*, is discussed in this paper for each of the major processes involved in PC combustion. Predictions have been made for swirling methane combustion and nonswirling PC combustion in cylindrical furnaces. Discussion of these cases should benefit future studies and direct needs for modeling and experimental validation studies. COMBUSTION MODEL Several physical processes are involved in the combustion of PC: • Gas and Solid Phase Flow • Chemical Reaction of Released Volatiles • Oxidation of Char • Heat Transfer Simulation of PC combustion must account for each of these processes. The combustion model presented in this paper solves the conservation equations of mass, momentum, and energy for the gas and particle phases in an axisymmetric geometry. Application of the model requires specification of fuel chemical and optical properties as well as associated rate constants for the decomposition of the fuel and its intermediate products. The model has been formulated assuming that the furnace has no-slip walls and known injection velocities. In addition, the incoming gas (and particles) are of known composition, the inlet particle size, mass, and mass distribution are provided, and wall emissivity and wall temperature or heat flux are known. * An abbreviation for COmbustion MOdel. -3- |
