Analysis of grinding and pulverizing coke particles around raceway in an iron making blast furnace

我们的最终目标是估计炼铁高炉回旋区周围的焦粉数量。在本研究中，我们开发了数值模拟模型来定量地估计颗粒流中脆性物质的研磨速度。研磨速度是一个速度和压力两个因素。研磨速度与速度、压力成正比。在小型转鼓上进行了稳定颗粒流的磨矿试验。用离散单元法(DEM)分析了颗粒的运动。为了计算假设为连续介质的流型，在每个平均网格中对DEM的结果进行了时间和体积的平均。这些结果可以很容易地与普通连续介质处理颗粒流的结果进行比较。我们建立了两个基于研磨试验相互摩擦的研磨速度估算模型。一个模型用于DEM分析，另一个模型用于传统方法。计算了转鼓内石膏颗粒的粉碎率，计算结果与实测值吻合较好。

Our ultimate objective is the estimation of amount of ground coke around the raceway in an iron making blast furnace. In this study, we developed the numerical simulation model to estimate quantitatively the grinding rate of a granular flow of brittle material.The grinding rate of two of a grinding rate, velocity and pressure. The grinding rate was proportional to velocity, and pressure. It was influenced by the mechanical strength related to porosity.The grinding test using the small rotational drum caused stable granular flow was carried out. The particles' motion was analyzed by the Distinct Element Method (DEM) . To calculate the flow pattern assumed as a continuum, the results by the DEM were averaged for both time and volume in each averaging grid. These results can be easily compared with results given by an ordinary continuum treatment for the granular flow.We developed two models to estimate grinding rate based on the mutual friction of grinding test. One model was for an analysis by the DEM,the other was for the traditional method. We calculated the grinding rate of the gypsum particles in the drum, and the estimated results of the grinding rate were in good agreement with observed ones.