料仓内粉体静态应力分布特性

doi:10.16085/j.issn.1000-6613.2018-1363

化工进展 ›› 2019, Vol. 38 ›› Issue (04): 1681-1687.DOI: 10.16085/j.issn.1000-6613.2018-1363

料仓内粉体静态应力分布特性

陈阳阳(),郭秀琦,梁财(),陈晓平,刘道银

东南大学能源与环境学院，能源热转换及其过程测控教育部重点实验室，江苏南京 210096

收稿日期:2018-07-03 修回日期:2018-10-23 出版日期:2019-04-05 发布日期:2019-04-05
通讯作者: 梁财
作者简介:<named-content content-type="corresp-name">陈阳阳</named-content>（1995—），女，硕士研究生，研究方向为料仓内应力分布特性。E-mail：<email>cyy514327@163.com</email>。|梁财，副教授，博士生导师，从事高压超浓相气力输送、粉体静电及洁净煤发电等研究。E-mail：<email>liangc@seu.edu.cn</email>。
基金资助:
国家自然科学基金(51676048)

Static stress distribution characteristics of powders in silos

Yangyang CHEN(),Xiuqi GUO,Cai LIANG(),Xiaoping CHEN,Daoyin LIU

Key Laboratory of Energy Thermal Conversion and Control Ministry of Education，School of Energy and Environment，Southeast University，Nanjing 210096，Jiangsu，China

Received:2018-07-03 Revised:2018-10-23 Online:2019-04-05 Published:2019-04-05
Contact: Cai LIANG

摘要/Abstract

摘要：

料仓内的粉体静态应力分布是指导料仓设计和运行的重要参数之一。本文在三维有机玻璃料仓中，对料仓应力分布进行试验研究，利用应力传感器对料仓壁面及粉体内部水平、竖直应力进行研究，获得料仓中粉体内部应力的分布规律，并基于拱效应对料仓中的应力分布进行理论研究。结果表明：料仓内部水平应力与距出口及料仓中心的距离基本无关，壁面处的水平应力在筒锥结合处达到最大值且随加料高度的增加大幅度增加。料仓内部垂直应力的最大值出现在筒锥结合处近筒段的料仓中心位置。同一平面，从料仓中心至仓壁，垂直应力呈逐渐减小的趋势。随加料高度的增加，垂直应力均逐渐增加。在壁面处，侧压力系数随着距出口高度的增加出现先增大后减小的趋势，在筒锥结合处大于1。

关键词: 料仓, 粉体, 应力分布, 拱效应, 侧压力系数

Abstract:

The static stress distribution of powders is one of the important parameters in the design and operation of the silo. The stress distribution in the hopper was studied in the three-dimensional plexiglass bin. The horizontal stress and vertical stress of the silo were measured using pressure sensor. The distribution rules of stress in the silo were obtained and analyzed theoretically based on arch effect. The results show that the horizontal stress in the silo is basically independent of the distance from the outlet and the center of the silo. The horizontal stress on the wall reaches its maximum at the cone-cylinder junction and increases greatly with the increase of the feeding height. The maximum vertical stress in the silo appears at the center of the silo near the cone junction. In the same horizontal section, the vertical stress decreases gradually from the center to wall of the silo. With the increase of the feeding height, vertical stress increased gradually. At the wall, the lateral stress ratio increases first and then decreases with the increase of the height from the outlet, and is greater than 1 at the cone-cylinder junction.

Key words: silo, powders, stress distribution, silo arching, lateral stress ratio

中图分类号:

TQ536

陈阳阳, 郭秀琦, 梁财, 陈晓平, 刘道银. 料仓内粉体静态应力分布特性[J]. 化工进展, 2019, 38(04): 1681-1687.

Yangyang CHEN, Xiuqi GUO, Cai LIANG, Xiaoping CHEN, Daoyin LIU. Static stress distribution characteristics of powders in silos[J]. Chemical Industry and Engineering Progress, 2019, 38(04): 1681-1687.

图/表 10

图1 料仓内粉体应力分布试验系统

图2 传感器布置图（单位：mm）

图3 物料的粒度分布

图4 玻璃珠的电镜扫描

图5 料仓内水平应力分布

图6 料仓内水平应力随加料高度变化

图7 料仓内垂直应力分布

图8 料仓内垂直应力随加料高度变化

图9 料仓内侧压力系数分布

图10 料仓内侧压力系数随加料高度变化

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料仓内粉体静态应力分布特性

Static stress distribution characteristics of powders in silos

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