纳米碳纤维合成催化剂的停留时间分布特征

摘要

The effects of rotary kiln inclination height at both high and low rotating rates on the residence time of catalyst are studied.The catalyst residence time distribution function and parameters value with different speed and slope height are obtained by simulating experimental data using the function of Sigmoid (C).The results indicate that the average residence time of catalyst in the rotary kiln decreases linearly with the increase of inclination height at both high and low rotating rates.The average residence time decreases faster at high rotating rate then slower at a low rotating rate.At different inclination heights,the average residence time of catalyst is inversely proportional to the rotating rate.The distribution density of residence time becomes more concentrated as the rotate speed and the inclination height increase,and the converse is also true.%利用搭建的回转窑冷模模型,考察了回转窑反应器的转速和倾斜高度对纳米碳纤维(CNFs)合成催化剂停留时间分布的影响.利用Sigmoid函数C对实验数据进行数值模拟,得到了不同转速和倾斜高度下的催化剂停留时间分布函数和参数数值.结果表明:催化剂平均停留时间在转速较低和较高时都随倾斜高度线性递减,并且转速较高时递减速率较快,在回转窑倾斜高度一定时,催化剂平均停留时间与转速成反比关系.在回转窑转速一定时,回转窑倾斜度越高,催化剂停留时间分布密度越集中,反之,则越分散;在回转窑倾斜高度一定时,回转窑转速越高,催化剂停留时间分布密度越集中,反之,越分散.