欢迎访问过程工程学报, 今天是

过程工程学报 ›› 2022, Vol. 22 ›› Issue (8): 1085-1093.DOI: 10.12034/j.issn.1009-606X.221384

• 研究论文 • 上一篇    下一篇

基于巴西果效应的颗粒床振动再生研究

王建宏1*， 莫晓燕1， 张会其1， 詹敏述2
  

  1. 1. 北京石油化工学院环境工程系，北京 102617 2. 东南大学-蒙纳士大学联合研究院颗粒体系仿真模拟中心，江苏 苏州 215123
  • 收稿日期:2021-11-23 修回日期:2021-12-14 出版日期:2022-08-28 发布日期:2022-08-28
  • 通讯作者: 王建宏 wangjianhong@bipt.edu.cn
  • 作者简介:王建宏(1974-)，女，湖北省红安县人，硕士研究生，高级实验师，环境工程专业，E-mail: wangjianhong@bipt.edu.cn.
  • 基金资助:
    北京市教委科研计划资助; 2020年北京石油化工学院教育教学改革与研究一般项目

Research on vibration regeneration of granular bed based on Brazil nuts effect

Jianhong WANG1*,  Xiaoyan MO1,  Huiqi ZHANG1,  Minshu ZHAN2   

  1. 1. Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China 2. Center for Simulation and Modelling of Particulate Systems, Southeast University-Monash University Joint Research Institute, Suzhou, Jiangsu 215123, China
  • Received:2021-11-23 Revised:2021-12-14 Online:2022-08-28 Published:2022-08-28

RichHTML

PDF

摘要： 为了探索一种低成本的、环境友好的颗粒床含尘滤料再生方式，采用垂直振动后拍照的方法，研究了滤料/粉尘的平均粒径比、体积比以及振动频率、加速度、振幅等对基于巴西果效应的滤料/粉尘的垂直振动分离的影响。结果表明，矿渣/滑石粉、矿渣/粉煤灰的平均粒径比不低于75，石英砂/滑石粉、石英砂/粉煤灰的平均粒径比分别不低于65, 15.3时，能形成巴西果。在20~100 Hz的振动频率下，矿渣/粉尘的振动加速度和振幅超过临界值时，矿渣/粉尘将从混合态转变为巴西果态。矿渣/粉尘体系形成巴西果的最优振动频率是45 Hz，该频率不受矿渣粒径、粉尘种类和矿渣/粉尘体积比的影响。矿渣粒径越大、矿渣/滑石粉的体积比越大，矿渣/滑石粉分离越容易, 矿渣/滑石粉比矿渣/粉煤灰体系更易形成巴西果。在45 Hz的最优频率下，矿渣/滑石粉和矿渣/粉煤灰分别在1.01和1.36 mm的较低振幅下，可实现垂直振动分离。采用基于巴西果效应的垂直振动方式分离颗粒床中含尘滤料是可行的，该分离方式有利于滤料的重复利用和提高颗粒床捕集细小粉尘粒子的能力，是一种具有应用前景的颗粒床滤料再生方式。

关键词: 颗粒床, 粉尘, 巴西果, 平均粒径比, 振动频率

Abstract: In order to explore a low-cost and environment-friendly regeneration method of the granular bed, the effects of the average particle size ratio and volume ratio of the granules/dust, vibration frequency, acceleration as well as amplitude on the vertical vibration separation of the granules/dust on Brazil nuts effects were studied by taking photos after vertical vibration. The results showed Brazil nuts could be formed when the average particle size ratio of slag/talc powder and slag/fly ash was not less than 75, and the average particle size ratio of quartz sand/talc powder and quartz sand/fly ash was not less than 65 and 15.3 respectively. When the vibration acceleration and amplitude of slag/dust exceeded the critical value at the vibration frequency of 20~100 Hz, slag/dust changed from mixed state to Brazil nuts. With the increase of vibration frequency, the critical acceleration first increased and then decreased, reached the lowest value at 45 Hz, and then continued to increase. The critical amplitude first decreased with the increase of vibration frequency, reached the lowest value at 45 Hz, and then continued to increase. The optimum vibration frequency of Brazil nuts formed by the slag/dust system was 45 Hz, which was not affected by the slag particle size, dust type, and slag/dust volume ratio. However, the larger the particle size of slag and the larger the volume ratio of slag/talc was, the easier the separation of slag/talc was, and the formation of Brazil nuts was easier in slag/talc than in slag/fly ash. At the optimal frequency of 45 Hz, slag/talc powder and slag/fly ash could realize vertical vibration separation at low amplitudes of 1.01 mm and 1.36 mm, respectively. The vertical vibration method based on Brazil nuts effect is feasible to separate the dust from the granules in the granular bed, which is beneficial to the reuse of the granular material and improves the ability of the granular bed to capture fine dust. The vertical vibration is a promising method of regeneration of the granular bed.

Key words: granular bed, dust, brazil nuts, average diameter ratio, vibration frequency