G061061 Nongray radiation simulation of a pulverized coal combustion field by the ^-distribution method

Abstract

To clarify the effect of radiation on the ignition of clouds of pulverized coal particles, the k - distribution nongray radiation method is incorporated into the multi-phase simulation tool developed by NETL, and then the coal jet flame experiments by Taniguchi et al. (2000) are simulated. Special attention is paid to the effects of scattering of the particles and soot derived from devolatilization of coal particles during the ignition process. It is shown that the presence of soot affects significantly the gas and particle temperatures after the ignition whereas the scattering of the coal particles has unimportant effects on the temperatures as well as the radiative heat sources.