The aim of the present study is to numerically investigate the combustion characteristics of Heavy Fuel Oil (HFO) and NOx emissions inside a Calciner used in cement industry. The combustion model was based on the conserved scalar (mixture fraction) and prescribed Probability Density Function (PDF) approach. The (RNG) k-ε turbulence model has been used. The HFO droplet trajectories were predicted by solving the momentum equations for the droplets using Lagrangian treatment. The radiation heat transfer equation was solved using P1 method. A swirl number greater than 0.6 was found to be optimal for good combustion characteristics and NOx emissions concentration. Meanwhile, it was found that the HFO viscosity value assumption has a significant effect on the injection velocity and must be considered as a function of temperature during the analysis as this will significantly affect the combustion characteristics.

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