CFD Investigation on Pollutant Production in a Cement Industrial Furnace

Pollutant emissions are considered as the most active factors in the acid rains production and ozone destruction process, studies and analyses of their production mechanisms may improve pollution reduction techniques and contribute to the developments of the measures and control systems. The present work deals with a CFD modeling of the thermal NO production issued from the natural gas (NG) combustion in an industrial furnace designed for cement production. Correlation between the NO production rate and the furnace operating conditions will be achieved .The non premixed turbulent combustion of the NG/Air mixture will be analyzed by some CFD software (Gambit, CEA, and Fluent) using a finite volume approach to solve the reacting flow equations written in a Favre averaging form on an axisymetric model of the furnace. A single step chemistry will be adopted for this combustion case, the closure of the system will be ensured by a ω − k two equations model with a limited Pope correction to account for the spreading rate dynamics of the oxidant jets. Algebraic (Magnussen) model for the reaction rate is adopted, in addition, primary and co-flow jets configuration effects on the NO production are examined and correlated to the overall efficiency of the combustion process.