The motion mechanism and characteristic of bubble in a pseudo-2D tapered fluidized bed

doi:10.1016/j.cjche.2021.06.024

中国化学工程学报 ›› 2022, Vol. 46 ›› Issue (6): 255-270.DOI: 10.1016/j.cjche.2021.06.024

The motion mechanism and characteristic of bubble in a pseudo-2D tapered fluidized bed

Wenjuan Bai¹, Dianming Chu¹, Kuanxin Tang¹, Lei Geng², Yan Li², Yan He¹

1 Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials, College of Electromechanical Engineering, Qingdao University of Science and Technology, Shandong 266061, China;
2 ShangDong Dazhan Nano Materials Co., Ltd, Shandong 256220, China

收稿日期:2021-03-29 修回日期:2021-06-13 出版日期:2022-06-28 发布日期:2022-07-20
通讯作者: Yan He,E-mail:heyan@qust.edu.cn
基金资助:
This work is supported by the National Natural Science Foundation of China (51676103) and Taishan Scholar Project of Shandong Province (ts20190937).

The motion mechanism and characteristic of bubble in a pseudo-2D tapered fluidized bed

Wenjuan Bai¹, Dianming Chu¹, Kuanxin Tang¹, Lei Geng², Yan Li², Yan He¹

1 Shandong Engineering Laboratory for Preparation and Application of High-performance Carbon-Materials, College of Electromechanical Engineering, Qingdao University of Science and Technology, Shandong 266061, China;
2 ShangDong Dazhan Nano Materials Co., Ltd, Shandong 256220, China

Received:2021-03-29 Revised:2021-06-13 Online:2022-06-28 Published:2022-07-20
Contact: Yan He,E-mail:heyan@qust.edu.cn
Supported by:
This work is supported by the National Natural Science Foundation of China (51676103) and Taishan Scholar Project of Shandong Province (ts20190937).

摘要/Abstract

摘要： The different carbon nanotube (CNT) particles (^@A and ^@V) were bed materials in the pseudo-2D tapered fluidized bed (TFB) with/without a distributor. A detailed investigation of the motion mechanism of bubbles was carried out. The high-speed photography and image analysis techniques were used to study bubble characteristic and mixing behavior in the tapered angle of TFB without a distributor. The fractal analysis method was used to analyze the degree of particles movement. Results showed that an S-shaped motion trajectory of bubbles was captured in the bed of ^@V particles. The population of observational bubbles in the bed of ^@V particles was more than that of ^@A particles, and the bubble size was smaller in the bed of ^@V particles than that of ^@A particles. The motion mechanism of bubbles had been shown to be related to bed materials and initial bed height in terms of analysis and comparison of bubble diameter, bubble aspect ratio and bubble shape factor. Importantly, compared to the TFB with a distributor, the TFB without a distributor had been proved to be beneficial to the CNT fluidization according to the study of bubble characteristic and the degree of the particle movement. Additionally, it was found that the mixing behavior of ^@V particles was better than ^@A particles in the tapered angle of TFB without a distributor.

关键词: Tapered fluidized bed, Carbon nanotube, Bubble characteristic, Image processing technique, Fractal analysis

Abstract: The different carbon nanotube (CNT) particles (^@A and ^@V) were bed materials in the pseudo-2D tapered fluidized bed (TFB) with/without a distributor. A detailed investigation of the motion mechanism of bubbles was carried out. The high-speed photography and image analysis techniques were used to study bubble characteristic and mixing behavior in the tapered angle of TFB without a distributor. The fractal analysis method was used to analyze the degree of particles movement. Results showed that an S-shaped motion trajectory of bubbles was captured in the bed of ^@V particles. The population of observational bubbles in the bed of ^@V particles was more than that of ^@A particles, and the bubble size was smaller in the bed of ^@V particles than that of ^@A particles. The motion mechanism of bubbles had been shown to be related to bed materials and initial bed height in terms of analysis and comparison of bubble diameter, bubble aspect ratio and bubble shape factor. Importantly, compared to the TFB with a distributor, the TFB without a distributor had been proved to be beneficial to the CNT fluidization according to the study of bubble characteristic and the degree of the particle movement. Additionally, it was found that the mixing behavior of ^@V particles was better than ^@A particles in the tapered angle of TFB without a distributor.

Key words: Tapered fluidized bed, Carbon nanotube, Bubble characteristic, Image processing technique, Fractal analysis

Wenjuan Bai, Dianming Chu, Kuanxin Tang, Lei Geng, Yan Li, Yan He. The motion mechanism and characteristic of bubble in a pseudo-2D tapered fluidized bed[J]. 中国化学工程学报, 2022, 46(6): 255-270.

Wenjuan Bai, Dianming Chu, Kuanxin Tang, Lei Geng, Yan Li, Yan He. The motion mechanism and characteristic of bubble in a pseudo-2D tapered fluidized bed[J]. Chinese Journal of Chemical Engineering, 2022, 46(6): 255-270.

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The motion mechanism and characteristic of bubble in a pseudo-2D tapered fluidized bed

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