Numerical Simulation of NOx Emission from Char Combustion with Detailed Gas Phase Mechanisms

Abstract

AbstractThe present paper proposed a mathematical model for the simulation of NOx emission from char combustion. The one‐dimensional two‐phase model developed by Kuo [9] was simplified, and a detailed gas‐phase reaction scheme was included, based on the work of Miller and Bowman [19] with updated reaction rates of some important reactions. The scheme includes 289 reactions and 51 species. Two global models for char oxidation were used and compared. The heterogeneous formation of NOx from char oxidation, the reaction of NOx destruction on the char surface, and the reaction of NO destruction by CO catalysed by char were taken into account during char combustion. Our work showed that NOx destruction is sensitive to the char oxidation rate. The heterogeneous reactions for both char oxidation and for NOx formation and destruction require further investigation.