Numerical Simulation Research on Dropping Behavior of Lump Coal from the Gasifier Dome
Abstract: Several correlative models were developed to evaluate heat and mass transfer phenomenon and dropping behaviour of lump coal from the gasifier dome. Some programs were used to acquire si-mulation result. The result shows that the dropping time of lump coal from the gasifier dome is very short. The acceleration speed decreases while the speed is increasing during the process of dropping. Temperature changes of lump coal are obvious in the dropping process of lump coal. Temperature changes focus on external node of lump coal. The temperature of internal node of lump coal is almost constant. Temperature change of outside surface of lump coal is obvious and the heating rate is high at the beginning of dropping of lump coal. However the heating rate decreases later and the temperature of lump coal increases slowly. Increase of internal node temperature of lump coal is slow because of influence of heat transfer. The surface moisture evaporates rapidly at the beginning of dropping of lump coal. The moisture evaporation rate of internal node of lump coal is faster than that of external node. The nearer the note to the core of lump coal, the lower the evaporation rate. The volatile removal of internal node of lump coal shows the ladder-like distribution. The density of lump coal decreases in the process of dropping.
文章引用: 王玉明 , 徐万仁 , 张 群 , 孙伟庆 (2015) 块煤在气化炉拱顶下落过程的数值模拟研究。 冶金工程， 2， 122-131. doi: 10.12677/MEng.2015.23018
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