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2015-04-08 - Colloque/Article dans les actes avec comité de lecture - Anglais - 10 page(s)

Nguyen Phuc Danh, Ghazal Ghassan, Gambale Alessandro, Lupant Delphine , Mosca Gabriele , "Combustion CFD of diluted combustion in pilot and industrial furnaces" in 10th european conference on industrial furnaces and boilers (INFUB-10), Porto, Portugal, 2015

  • Codes CREF : Recherche énergétique (DI2290), Transfert de chaleur (DI2211), Combustion (DI2212)
  • Unités de recherche UMONS : Thermique et Combustion (F704)
  • Instituts UMONS : Institut de Recherche en Energétique (Energie)

Abstract(s) :

(Anglais) Using auto-produced gases issued from steelmaking industry in steelmaking process itself has a very positive impact on the environment and the energy saving. Improving existing combustion systems or designing new combustion systems for less pollutant emissions and efficient utilization of steel gases is always a challenging task and the Computational Fluid Dynamics (CFD) can play a significant role in the design phase. Flameless combustion technology by diluting combustion or by staging air and/or fuel mixing with high degree of flue gases recirculation which limits peak flame temperature thereby reducing NOx formation rate is being deployed. Modelling diluted combustion is still challenging because detailed chemistry should be taken into account and the related heavy simulations should be run on massively parallel computers. An effort has been made in this study to model diluted combustion by using the Eddy Dissipation Concept (EDC) combustion model in the AnsysFluent® software coupled with the detailed chemical kinetics KEE58 (including 18 species and 58 elementary chemical reactions). The methodology was first validated on the labscale pilot 30kW flameless combustion furnace firing on the steelmaking Coke Oven Gas (COG). Experimental data such as energy balance, wall temperature, recorded OH chemiluminescence images, outlet species (CO2, H2O, O2, CO and N2) and temperature measurements were used for the validation of the numerical model. The validated method was then employed to calculate ArcelorMittal coke-making combustion ovens whose working conditions represent an important dilution between reactants and flue gases to improve heating process. An agreement was obtained between the numerical results and the industrial measurement data. The modelling method was then used to study different conditions for alternative underfiring gas.