Numerical Simulation of Oxygen-Enriched Combustion of Low-Quality Coal in Cement Rotary Kiln

Abstract

On the basis of the original four-channel burner, the oxygen-enriched channel is added to control the oxygen-enriched rate by adjusting the opening of the valve at the entrance of the oxygen-enriched channel. In actual production, the oxygen concentration in rotary kiln can be adjusted more flexibly to meet the combustion needs of different coal types in kiln and realize oxygen-enriched combustion under different oxygen concentration. A physical model of rotary kiln - burner is established in this paper, using FLUENT to increase the oxygen - channel rotary kiln burner structure for numerical simulation of combustion of pulverized coal. The distribution of velocity field, combustion temperature and component concentration field in kiln were analyzed, and the combustion characteristics of pulverized coal in kiln were compared between two kinds of burners. The calculation results show that the addition of oxygen-enriched channels will not cause significant changes in the velocity field in the rotary kiln, and can promote the combustion of pulverized coal in the rotary kiln, thus verifying the feasibility of adding oxygen-enriched channels.