移动床出口设置对卸料特性影响的离散模拟

doi:10.11949/j.issn.0438-1157.20151714

化工学报 ›› 2016, Vol. 67 ›› Issue (5): 1710-1718.DOI: 10.11949/j.issn.0438-1157.20151714

移动床出口设置对卸料特性影响的离散模拟

肖晓¹, 苏景林², 许光文³, 崔丽杰¹, 刘晓星³

1 中国科学院大学研究生院, 北京 100049;
2 辽宁科技大学化学工程学院, 辽宁鞍山 114051;
3 中国科学院过程工程研究所, 北京 100090

收稿日期:2015-11-13 修回日期:2016-01-11 出版日期:2016-05-05 发布日期:2016-05-05
通讯作者: 刘晓星, 崔丽杰
基金资助:
国家高技术研究发展计划项目(2013AA051204);中国科学院“百人计划”项目。

Discrete modeling of discharge dynamics of granular material in moving bed: effect of outlet setting

XIAO Xiao¹, SU Jinglin², XU Guangwen³, CUI Lijie¹, LIU Xiaoxing³

1 University of Chinese Academy of Sciences, Beijing 100049, China;
2 Department of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China;
3 Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China

Received:2015-11-13 Revised:2016-01-11 Online:2016-05-05 Published:2016-05-05
Supported by:
supported by the National High Technology Research and Development Program of China (2013AA051204) and the Hundred Talents Program of Chinese Academy of Sciences.

摘要/Abstract

摘要：

采用离散单元法(DEM)模拟研究了二维移动床出口设置对物料卸料特性的影响。为验证模拟结果的合理性,首先针对单出口移动床进行了模拟研究,模拟结果表明:出口处颗粒质量流率满足修正的Beverloo经验关系式,而且定性上物料层内部流动区宽度随出口宽度的变化规律与实验结果吻合良好。在此基础上对两出口移动床的卸料特性进行了研究,得到以下结论:当出口宽度相等时,物料层内流动区宽度等于单出口条件下流动区宽度、出口间距及出口宽度的加和,而且每个出口处颗粒质量流率与单出口条件下颗粒质量流率相当;当出口宽度不相等时,增加大出口的宽度或减小出口之间的距离有助于提高小出口处颗粒质量流率,但大出口处颗粒质量流率基本保持恒定,不受小出口影响。

关键词: 移动床, 颗粒物料, 多出口, 离散单元法, 数值模拟

Abstract:

The influence of outlet setting on the discharge dynamics of granular material in 2D moving beds was investigated by conducting discrete element simulations. To validate the simulation, a moving bed with single outlet was first modeled. The simulation results showed that the variation of discharge rate was tally with the modified Beverloo, and the variation tendency of the width of funnel zone was in agreement with the experimental data. Based on such validation, the discharge characteristics of granular material in the moving bed with two outlets were then systematically investigated. The simulation results indicated that as to the bed with two same size outlets, the width of funnel zone was simply equal to the sum of the width of funnel zone of the moving bed with one same size outlet, the distance between outlets and the width of outlet, and the granular mass discharge rate was roughly equivalent to that of the moving bed with one same size outlet. For the bed with two different size outlets, increasing the width of large outlet or decreasing the outlet distance was conducive to increasing the discharge rate at small outlet. Nevertheless, the discharge rate at large outlet was not influenced by the small outlet and nearly kept constant.

Key words: moving bed, granular materials, multiple outlet, discrete element method, numerical simula

中图分类号:

TQ018

肖晓, 苏景林, 许光文, 崔丽杰, 刘晓星. 移动床出口设置对卸料特性影响的离散模拟[J]. 化工学报, 2016, 67(5): 1710-1718.

XIAO Xiao, SU Jinglin, XU Guangwen, CUI Lijie, LIU Xiaoxing. Discrete modeling of discharge dynamics of granular material in moving bed: effect of outlet setting[J]. CIESC Journal, 2016, 67(5): 1710-1718.

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移动床出口设置对卸料特性影响的离散模拟

Discrete modeling of discharge dynamics of granular material in moving bed: effect of outlet setting

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