Numerical simulation on influence factors of thermal working conditions in carbon rotary kilns

Taking a φ2.3 m×55 m carbon rotary kiln for example, numerical simulations were conducted on the gas and solid spaces of the kiln using the Fluent and Matlab softwares.The influences of parameters such as the secondary and tertiary air inlet positions and air flow,turn-down rigs on the kiln lining, filling ratio of solids, rotation speed of the kiln on the kiln temperature were predicted.The results indicate that, if the secondary and tertiary air inlet positions and air flow,or the size and the number of the turn-down rigs are reasonably designed, the kiln temperature will be increased, resulting in the improvement for the quality of the calcined cokes.In addition, properly increasing the filling ratio of solids or rotation speed can increase the kiln output and ensure the quality of the calcined cokes at the same time.