A numerical Computational Fluid Dynamics (CFD) model has been used to simulate the fluid flow, heat transfer and combustion in a Ceramic Recuperative Radiant Tube Burner (RTB). The influence of various parameters such as furnace temperature, firing rate, airfactor and burner geometry on ceramic tube temperature uniformity and peak temperature as well as on the burner efficiency has been studied. This study shows that the thermal efficiency increases with decreasing furnace temperature, airfactor and firing rate. In the outer tube a hot-band-region exists close to the burner top at the ending of the inner tube. It was found that the outer tube temperature becomes more uniform at higher furnace temperatures. Tube temperature uniformity and burner efficiency can be significantly enhanced by changes in burner dimensions. Predicted tube temperatures and burner efficiencies are in good agreement with measured data.
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