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Computational study of coal combustion in an entrained flow furnace

The present study deals with reacting multiphase flow and its interaction with turbulence in a laboratory scale entrained flow furnace with a swirl burner configuration. The furnace inlet has an axial stream of air carrying coal particles surrounded by a co-flow of swirling air. Such flow configurations are encountered in many practical solid-fuel combustion systems. Lagrangian approach is employed for tracking coal particles and Eulerian approach for solving gas phase. Turbulence was modeled using the shear stress transport (SST) k-ω model. A two-way coupling of mass, momentum, energy and species of the dispersed phase with the continuum is considered. The developed computational model is validated against the reported experimental data. The results show that a considerably improved modeling of the sub-grid scale mixing is required, as compared to the present state-of-the-art, in order to obtain reasonable results, close to the burner that match well with the experimental data.