The Application Of Coal Burning General Model In Precalciner Numerical Simulation

Precalciner is one of the most important machines in the most advanced cement manufacturing method. It has multi-phase flow; combustion of fuel; heat transfer and decomposition of carbonate co-exist in it. The main chemical reactions in a precalciner, namely the combustion of pulverized coal and the decomposition of carbonate, occur in a suspending state and interact with each other, which makes the researching jobs extremely tough. The researching methods always decide the level of researching jobs on precalciners. Traditional engineering research methods mostly adopt the ways of model experiments, and along with the developing of computing technology and methods, especially the CFD (Computational Fluid Dynamics) and its arithmetic, the native and overseas CFD numerical simulation research of precalciner has obtain great progress presently. Many researchers have made in-depth research with many sorts of precalciner and their reaction mechanism inside.Coal powder burning is the important course in the precalciner. The sufficient grasp of coal tar burning course is the key of burning. The existing precalciner simulation software cannot correctly predict the parameters of coal powder burning base on the industry analysis value. We add the macro-general rules of coal burning into the user-interface files, and developed new numerical simulation software. We have made research of the reliability of the models, with the conjoint methods of experiments and theory. We thought that the macro-general models and this software could be used to apply in the coal burning and carbonates decomposing in the precalciner.We used the numerical software to carry out a numeric simulation by taking the ejecting-revolving pipe precalciner designed by NCDRI (Nanjing Cement Design and Research Institute) as a geometric model. We analyzed the results, entirely and visually represented the raw meal decomposing, the coal powder burning, the temperature in the centerline, the CO density distributing, and the fields of the velocity, temperature and pressure.