3-D NUMERICAL-MODEL FOR PREDICTING NOX EMISSIONS FROM AN INDUSTRIAL PULVERIZED COAL COMBUSTOR

The paper describes a three-dimensional computer simulation developed to predict the behaviour of industrial pulverized coal furnaces. The model was applied to a 300 MWe front-wall fired boiler under different operating conditions. The main characteristics of the current model are the use of the Lagrangian framework to describe the particulate phase, the discrete transfer model to handle the radiation transmission, and the standard k-epsilon model for turbulence treatment. The turbulent dispersion of particles is described by a new stochastic self-stable strategy. The NO(x) formation mechanism is calculated in a post-processor routine. Measurements of NO(x) emissions were made in the flue gases; the results agree well with those obtained by the simulations.