Numerical Simulations of Combustion Characteristics and NO_x Emissions for Two Configurations of Swirl Coal Burners in a 300 MWe Wall-Fired Boiler

Abstract

We studied both experimentally and numerically the pulverized-coal combustion process and NO _x emissions in a 300 MW_e wall-fired boiler burning bituminous coal. In simulations of an enhanced ignition-dual register (EI-DR) burner arrangement, results gave values of 6.39% and 861.43 mg/m³ at 6% O₂ for combustible material content in the fly ash and NO _x concentration at the furnace outlet, respectively. Meanwhile, simulations with a centrally fuel rich (CFR) swirl burner arrangement gave similar results of 3.63% and 695.36 mg/m³ at 6% O₂. Comparing the two, the NO _x concentration of the latter had decreased by 19.28%.

Acknowledgments

This work was supported by the Hi-Tech Research and Development Program of China (contract no. 2007AA05Z301), Heilongjiang Province via 2005 Key Projects (contract no. GC05A314), the Changjiang Scholars and Innovative Research Team in University (IRT0914).