Development of numerical model for estimation of grinding rate of particles under the fluidization

An accumulation of coke fine in blast furnace which caused by an operation with pulverized coal injection, makes decrease of air permeability in the furnace. One of the factors of this problem is that coke particles are impacting each other and coke fine generates in the raceway. However, it is so high temperature and pressure in raceway that it is very difficult to admeasure various parameters of coke grinding phenomenon. Therefore, a numerical model for estimation of grinding rate is required. We developed a numerical model for estimation of the grinding rate using result of both analysis of gypsum particles behavior and grinding experiment with gypsum particles. The model is based on grinding energy calculated by combining measured grinding rate of gypsum particles in a rotational drum with analyzed data of behavior of the particles. Additionally, we examine the validity of the numerical model to apply to a spouted bed. Thereby we verified qualitative validity of the model.