Improving advantages and reducing risks in increasing cyclone height via an apex cone to grasp vortex end

doi:10.1016/j.cjche.2022.04.014

中国化学工程学报 ›› 2023, Vol. 54 ›› Issue (2): 136-143.DOI: 10.1016/j.cjche.2022.04.014

• Full Length Article • 上一篇下一篇

Improving advantages and reducing risks in increasing cyclone height via an apex cone to grasp vortex end

Ronghua Zhang¹, Jingxuan Yang¹, Shaoxing Han¹, Xiaogang Hao¹, Guoqing Guan²

1. College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China;
2. Energy Conversion Engineering Laboratory, Institute of Regional Innovation (IRI), Hirosaki University, 2-1-3, Matsubara, Aomori 030-0813, Japan

收稿日期:2022-01-26 修回日期:2022-04-21 出版日期:2023-02-28 发布日期:2023-05-11
通讯作者: Xiaogang Hao,E-mail:xghao@tyut.edu.cn;Guoqing Guan,E-mail:guan@hirosaki-u.ac.jp
基金资助:
This work is sponsored by the National Natural Science Foundation of China (21506139 and U1710101).

Improving advantages and reducing risks in increasing cyclone height via an apex cone to grasp vortex end

Ronghua Zhang¹, Jingxuan Yang¹, Shaoxing Han¹, Xiaogang Hao¹, Guoqing Guan²

1. College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, China;
2. Energy Conversion Engineering Laboratory, Institute of Regional Innovation (IRI), Hirosaki University, 2-1-3, Matsubara, Aomori 030-0813, Japan

Received:2022-01-26 Revised:2022-04-21 Online:2023-02-28 Published:2023-05-11
Contact: Xiaogang Hao,E-mail:xghao@tyut.edu.cn;Guoqing Guan,E-mail:guan@hirosaki-u.ac.jp
Supported by:
This work is sponsored by the National Natural Science Foundation of China (21506139 and U1710101).

摘要/Abstract

摘要： For a cyclone, it is possible to improve separation efficiency and reduce pressure drop by increasing the cyclone height. However, an exceeded height increase could result in a dramatical drop in separation efficiency. In this study, experimental and computational fluid dynamics simulation results exhibit that the introduction of an apex cone at the dust outlet could avoid the risk of separation efficiency drop but lead to a continuous reducing of the pressure drop. Generally, the optimal cyclone height should be closely related to the natural vortex length. While, when the vortex end contracts into the separation space in the cyclone with an exceeded height, severe back-mixing of particles always occurs, which will result in the decrease of separation efficiency. Herein, it is found that when an apex cone is installed at the dust outlet, the vortex end can be grasped by the cone so as to weaken the back-mixing of particles. Meanwhile, the introduction of this apex cone can enhance the secondary separation to capture the back-mixed particles again so as to protect the efficiency. In addition, it is found that the enhanced secondary separation could come from either the stagnant current of axial velocity in the center or the improved tangential velocity of inner vortex whereas the forcibly extending the length of vortex to exceed its natural length will not significantly increase efficiency.

关键词: Cyclone separator, Cyclone height, Natural vortex length, Efficiency, Secondary separation

Abstract: For a cyclone, it is possible to improve separation efficiency and reduce pressure drop by increasing the cyclone height. However, an exceeded height increase could result in a dramatical drop in separation efficiency. In this study, experimental and computational fluid dynamics simulation results exhibit that the introduction of an apex cone at the dust outlet could avoid the risk of separation efficiency drop but lead to a continuous reducing of the pressure drop. Generally, the optimal cyclone height should be closely related to the natural vortex length. While, when the vortex end contracts into the separation space in the cyclone with an exceeded height, severe back-mixing of particles always occurs, which will result in the decrease of separation efficiency. Herein, it is found that when an apex cone is installed at the dust outlet, the vortex end can be grasped by the cone so as to weaken the back-mixing of particles. Meanwhile, the introduction of this apex cone can enhance the secondary separation to capture the back-mixed particles again so as to protect the efficiency. In addition, it is found that the enhanced secondary separation could come from either the stagnant current of axial velocity in the center or the improved tangential velocity of inner vortex whereas the forcibly extending the length of vortex to exceed its natural length will not significantly increase efficiency.

Key words: Cyclone separator, Cyclone height, Natural vortex length, Efficiency, Secondary separation

Ronghua Zhang, Jingxuan Yang, Shaoxing Han, Xiaogang Hao, Guoqing Guan. Improving advantages and reducing risks in increasing cyclone height via an apex cone to grasp vortex end[J]. 中国化学工程学报, 2023, 54(2): 136-143.

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Improving advantages and reducing risks in increasing cyclone height via an apex cone to grasp vortex end

Improving advantages and reducing risks in increasing cyclone height via an apex cone to grasp vortex end

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