内置活动内构件回转窑内二元颗粒的运动混合研究

doi:10.16085/j.issn.1000-6613.2017-1046

化工进展 ›› 2018, Vol. 37 ›› Issue (03): 845-852.DOI: 10.16085/j.issn.1000-6613.2017-1046

内置活动内构件回转窑内二元颗粒的运动混合研究

张立栋, 韦庆文, 李连好, 王擎, 李少华, 秦宏

东北电力大学能源与动力工程学院, 吉林吉林 132012

收稿日期:2017-06-02 修回日期:2017-07-30 出版日期:2018-03-05 发布日期:2018-03-05
通讯作者: 张立栋(1980-),男,博士,副教授,主要研究方向为油页岩综合利用及回转装置混合与分离。
基金资助:
教育部长江学者和创新团队发展计划（IRT_17R19）、吉林省自然科学基金（20150101033JC）及吉林市科技计划（201464044）及吉教科合字2015-237项目。

Research on motion and mixing of binary particles in rotary kiln installed with unfixed internals

ZHANG Lidong, WEI Qingwen, LI Lianhao, WANG Qing, LI Shaohua, QIN Hong

School of Energy Resource and Power Engineering, Northeast Electric Power University, Jilin 132012, Jilin, China

Received:2017-06-02 Revised:2017-07-30 Online:2018-03-05 Published:2018-03-05

摘要/Abstract

摘要： 采用离散单元法（DEM）对内置活动内构件回转窑内二元颗粒的运动混合进行了数值模拟。探讨了添加不同长度活动内构件时（回转窑转速、活动内构件宽度及厚度均固定）示踪颗粒的运动轨迹以及颗粒整体的运动模式。用接触数指标来定量评价颗粒的混合程度，比较了添加不同长度活动内构件时回转窑内二元颗粒的混合程度。结果表明：当活动内构件长度分别为0、13mm、21mm、29mm和37mm时，长度越长，示踪颗粒运动轨迹的遍历区域越大，运动轨迹稀疏区和密集区的差别越小，比起无内构件，添加活动内构件时颗粒的运动方向更加随机，运动轨迹更加紊乱。因活动内构件的存在，颗粒的运动模式由滚落模式变为阶梯模式。活动内构件的扰动和搅拌作用可以有效增强二元颗粒之间的混合。活动内构件存在一个最优长度，过长或过短都不能获得最理想的增混效果。

关键词: 回转窑, 二元颗粒, 活动内构件, 混合程度

Abstract: The motion and mixing of large particles and small particles in rotary kiln installed with unfixed internals was simulated with discrete element method(DEM). The motion trajectories and motion mode of particles were investigated when installing unfixed internals of different lengths(the rotational speed of rotary kiln,the width and thickness of unfixed internals were constant). The contact number index was used to compare the mixing degree of binary particles in rotary kiln installed unfixed internals of different lengths. The results indicated that when the lengths of unfixed internals were 0,13mm,21mm,29mm and 37mm,the longer the length,the larger the ergodic region of tracer particle's motion trajectory,the smaller the difference of sparse area and dense area of tracer particle's motion trajectory. The tracer particle's motion trajectory was more disorder when installing unfixed internals. The motion mode of particles transformed from rolling to slumping due to the existence of unfixed internals. The disturbance and stirring of unfixed internals could enhance the mixing of large particles and small particles effectively. There is an optimal length of unfixed internals for enhancing mixing of binary particles.

Key words: rotary kiln, binary particles, unfixed internals, mixing degree

中图分类号:

TQ051

张立栋, 韦庆文, 李连好, 王擎, 李少华, 秦宏. 内置活动内构件回转窑内二元颗粒的运动混合研究[J]. 化工进展, 2018, 37(03): 845-852.

ZHANG Lidong, WEI Qingwen, LI Lianhao, WANG Qing, LI Shaohua, QIN Hong. Research on motion and mixing of binary particles in rotary kiln installed with unfixed internals[J]. Chemical Industry and Engineering Progress, 2018, 37(03): 845-852.

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内置活动内构件回转窑内二元颗粒的运动混合研究

Research on motion and mixing of binary particles in rotary kiln installed with unfixed internals

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