CFD simulation of reactive flow in parallel flow regenerative shaft kilns using porous media model
2021
Understanding the flow pattern of the gas jets in packed beds can have
considerable significance in improving reactor design and process
optimization. This study researches the fuel diffusion in the radial
direction and the flame length in a packed bed of a Parallel Flow
Regenerative (PFR) Shaft kiln. This kiln is characterized that the fuel is
injected vertically in the packed bed using a lot of lances in the
cross-section while the combustion air is distributed continuously. Such a
large, packed bed has to be approximated as a porous media. This assumption
is used to model the reactive flow in the kilns. Using a box with 700
spheres of 52 mm spheres in Body-Centered Cube (B.C.C.) arrangement the
local concentrations of injected nitrogen in airflow were measured. The
measured values match approximately with those calculated with the Porous
Media Model (PMM). The studied parameters are the number of burners and
burner arrangements. The radial mixing of fuel and air in a packed bed is
relatively bad. Therefore, a lot of burners are needed for better
temperature homogenization in the cross-section.
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