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通过离散元(DEM)法数值模拟软件对烧结混合料在圆筒中的制粒过程进行了数值模拟。模拟结果表明,圆筒混合机的适宜制粒参数为:充填率10%左右,圆筒转速满足N/N临=0.3左右。圆筒转速和充填率过大或过小均对制粒不利,适宜制粒参数的选择应该以物料产生层状瀑布式运动为标准进行判断。另外,模拟结果还表明,制粒主要包括两个过程:一个是颗粒长大,一个是颗粒破坏。当前者占主导时,制粒才能进行,当后者占主导时,制粒效果变差。颗粒的长大主要依靠颗粒滚动,而颗粒的破坏主要是由颗粒之间以及颗粒与筒壁之间的碰撞所致。
The granulation process of the sinter mixture in the cylinder was simulated by discrete element (DEM) numerical simulation software. The simulation results show that the optimum granulation parameters of the cylinder mixer are as follows: the filling rate is about 10% and the cylinder rotation speed is about N / N = 0.3. Cylinder speed and filling rate is too large or too small are unfavorable granulation, granulation parameters should be selected for the material to produce layered waterfall movement as the standard judge. In addition, the simulation results also show that the granulation mainly includes two processes: one is the growth of particles and the other is the destruction of particles. When the current dominant, granulation can be carried out, when the latter dominated, granulation effect worsened. Particle growth mainly depends on the particles rolling, and particle damage is mainly caused by the collision between the particles and between the particles and the cylinder wall.