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Numerical Modelling of Emissions of Nitrogen Oxides in Solid Fuel Combustion

Among combustion products, nitrogen oxides are one of the main contributors to negative impact to the environment, participating in harmful processes such as tropospheric ozone and acid rains production. The main source of emissions of nitrogen oxides is the human combustion of fossil fuels. Their formation models are investigated and implemented with the goal of obtaining a tool for studying the nitrogen- containing pollutant production. In this work, numerical simulation of solid fuel combustion was carried out on a three- dimensional model of a drop tube furnace by using the commercial software FIRE. This code was used for simulating turbulent fluid flow and temperature field, concentrations of the reactants and products as well as the fluid- particles interaction by numerically solving the integro- differential equations that govern these processes. Chemical reactions mechanisms for the formation of nitrogen oxides were implemented by the user functions. To achieve reasonable calculation times for running the simulations, as well as efficient coupling with the turbulent mixing process, the nitrogen scheme is limited to sufficiently few homogeneous reactions and species. Turbulent fluctuations that affect the reaction rates of nitrogen oxides’ concentration are modelled by probability density function approach.

Solid fuel combustion, nitrogen oxides, drop tube, CFD

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