1. Electric agglomeration modes of coal-fired fly-ash particles with water droplet humidification.
- Author
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Chang, Qianyun, Zheng, Chenghang, Yang, Zhengda, Fang, Mengxiang, Gao, Xiang, Luo, Zhongyang, and Cen, Kefa
- Subjects
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ELECTROSTATICS , *FLY ash , *AGGLOMERATION (Materials) , *HUMIDITY control , *DROPLETS , *COAL - Abstract
Electric agglomeration is a useful method to improve fly-ash particle collection efficiency in traditional electrostatic precipitators (ESPs) by increasing particle diameter and achieving particle pre-charging. In this study, a laboratory agglomerator, which consisted of a pre-charging region and a static mixer, was designed and tested for fine particle agglomeration. The pre-charging provided both positive and negative discharges in parallel channels. Fine water droplets were used to enhance particle agglomeration and collection efficiency in a downstream small ESP. The operating effects were evaluated under various applied voltages and droplet concentrations. Experimental results showed that the presence of water droplets effectively improved coal-fired particle agglomeration, pre-charging, and collection in the ESP. The total number collection efficiency improved from 53.91% to 86.02% compared with the condition without the agglomerator. In addition, a novel sampling method was used to observe agglomerated particles using scanning electron microscopy, and theoretical adhesive force analysis supported the proposal of a series of power-plant particle electric agglomeration modes. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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