Abstract

In this study, the effects of nearly three-wind pulverised coal sprayed into the decomposition furnace on the temperature and NO distribution were analysed using the numerical simulation method of Computational Fluid Dynamics (CFD) for the nitrogen oxides (NOx) emission problem of NST-type decomposition furnace in a cement production line in a particular place. By creating a geometric model and meshing the decomposition furnace, as well as by using the proper mathematical models and numerical solutions, the trajectory, temperature distribution, and NO formation of coal dust were all simulated. The findings indicate that the three winds and the kiln tail flue gas have an impact on the motion trajectory of the coal dust after it is sprayed into the decomposition furnace, which causes a localised high temperature phenomenon to arise. The pulverised coal’s trajectories varied according to the placements of the coal injection pipe, which in turn had an impact on the decomposition furnace’s temperature distribution. Furthermore, NO is produced by the quick combustion of pulverised coal with a high oxygen content upon injection, which aggravates the development of a localised high temperature zone. Additionally, it was discovered that a higher fraction of coal infusion would highlight the unequal distribution of NO within the decomposition furnace. To sum up, this research offers a valuable resource and theoretical backing for addressing NO emission issues in decomposition furnaces.