中文摘要：

为了研究活性焦颗粒在移动床内的流动特性，通过离散单元法直接数值模拟方法对活性焦即圆柱形颗粒在移动床内的流动进行了数值模拟。采用多元颗粒模型来描述圆柱形颗粒，即圆柱形颗粒通过几个叠加在一起的球元构成。建立了圆柱形颗粒的碰撞机制，分析了圆柱形颗粒在流动时的受力情况，并通过实验验证多元颗粒模型的可靠性。从宏观和微观2个方面，比较圆柱形颗粒2种构建方式（2球元和3球元1下的模拟结果。结果表明：2球元和3球元构建的圆柱形颗粒在动能、转动动能、变形量、碰撞力、碰撞次数等微观方面的差别较大。且通过比较颗粒位置图和下料率可以看出，3球元圆柱形颗粒的模拟结果与实际结果更加相符，因此，选择3球元作为圆柱形颗粒的构建方式。

英文摘要：

Discrete element model （DEM） was developed to simulate the cylindrical particles （active carbon） for studying the flow characteristic of active carbon flowing in the moving bed. Multi-element particle model was used to describe the cylindrical particle that means the cylindrical particle was constructed by several overlapping spheres. The contact detection algorithm of cylindrical particle was developed. Contact force and gravity force were considered when establishing the models, and the model was validated by the experiment results. Two-sphere representation of cylindrical particle and three-sphere representation were compared from Macro and Micro two aspects. The results show that, there is big difference between kinetic energy, rotational kinetic energy, deformation, and contact force and collision number of two representations. And it shows that the simulation result of three-sphere representation is more close to the experiment results according to the flow pattem and discharge rate. So the three-sphere representation was chosen in the simulation.