Numerical Simulation of the Formation of Nitrogen Oxides in Pulverized Furnaces

The object of research is the area of generation of nitrogen oxides of a pulverized coal torch. Theoretical and experimental studies of the combustion process in the combustion chamber of the boiler were performed. Multiparametric calculations using numerical simulation methods make it possible to obtain results that are fully compatible with experimental data, as well as to visualize the solutions obtained. Consideration of alternative technical solutions, analysis of existing methods to reduce the formation and emission of nitrogen oxides and consideration of the possibility of applying an integrated approach to the issue of reducing the formation of nitrogen oxides using the method of mathematical modelling in combination with experiment – all together represents a tool of this study. Based on a comparison of the results of theoretical calculations with experimental data, important conclusions on the formation of nitric oxide in pulverized furnaces were obtained. In the numerical simulation, the effect parameters such as fuel consumption, fuel temperature and air temperature on the nitrogen oxides’ formation processes are investigated. Increasing the concentration of oxygen from 16 to 18% significantly increases both the temperature and the formation of thermal nitrogen. The increase in the concentration of coal dust has a complex nature of dependence, for instance at values higher than 40 kg/h, there was a reduction in the formation of nitrogen oxides.