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Numerical Simulation of Particle Agglomeration and Bed Shrink in Sintering Process

机译：烧结过程中颗粒团聚和床缩的数值模拟

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The motions of the particles and the gas in the actual scale sintering bed were simulated to elucidate the mechanism of the bed structure changes, the bed shrink and the local void formations by the simultaneous calculation of Navier-Stokes equations and the Lagrangian DEM equations based on the simple sintering model in which the phase change of particles and the cohesion forces due to the liquid bridges among particles were considered.rnThe bed shrink rate decreased with the moving downward of the melting zone. This is mainly because the weight of the particle bed increases with increasing the bed height. The gap of the particle motions occurred between the zones of which the content and the contact number were largely different. The gap separates contact particles and the crack appears. The shrinks of the beds with the large particles (MEBIOS particle) were smaller than that of the bed without the large particles. The reasons are that the large particles do not change the particle volume and also the high void region around the large particles is formed. The crack did not occur in the particle bed placing the large particles. The large scale zones of which the content and the contact number are largely different are cut off by the large particles and the small crack originated from the separation of contact points between iron ore particles does not grow by the existence of the large particles. After the sintering the high number density areas on the large particles and the void areas under the large particles were formed. This is because the large particles with smaller particle density relatively ascend among the small particles with the larger particle density. The void areas under the large particles advance the aggregation among the small particles which do not contact with the large particles.
机译：通过同时计算Navier-Stokes方程和Lagrangian DEM方程，模拟了实际规模烧结床中颗粒和气体的运动，以阐明床结构变化，床收缩和局部空隙形成的机理。考虑了颗粒之间的相变和颗粒间的液桥作用而产生的内聚力，采用简单的烧结模型。床层收缩率随熔融区的向下移动而减小。这主要是因为颗粒床的重量随着床高度的增加而增加。粒子运动的间隙出现在含量和接触数相差很大的区域之间。间隙将接触颗粒分开，出现裂纹。具有大颗粒（MEBIOS颗粒）的床的收缩比没有大颗粒的床的收缩小。原因是大颗粒不改变颗粒体积，并且在大颗粒周围形成高空隙区域。在放置大颗粒的颗粒床上没有出现裂纹。含量和接触数相差很大的大面积区域被大颗粒切断，而由于大颗粒的存在，由铁矿石颗粒之间的接触点分离引起的小裂纹不会增长。烧结之后，在大颗粒上形成高密度区域，在大颗粒下形成空隙区域。这是因为，具有较小颗粒密度的大颗粒在具有较大颗粒密度的小颗粒中相对地上升。大颗粒下面的空隙区域促进了不与大颗粒接触的小颗粒之间的聚集。

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