The new type swirl-spray precalciner used in cement plant is a large-scale and complex reactor in chemical engineering.In this work a full three-dimensional numerical simulation is carried out for swirl-spray precalciner
and at the same time a new method for particle trajectory in rectangular-structural grid is presented.The results of simulation disclose and predict the physicochemical process of precalciner and the numerical simulation results agree well with the experimental results.