Journal of Northeastern University(Natural Science) ›› 2021, Vol. 42 ›› Issue (9): 1335-1340.DOI: 10.12068/j.issn.1005-3026.2021.09.017

• Resources & Civil Engineering • Previous Articles     Next Articles

Enhancement of Filtration Performance of Fibrous Filter for Unipolarly Charged Coal-Fired Fly Ash

LYU Chao, LIU Jing-xian, SUN Xi, YU Zhen-hui   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Revised:2021-03-07 Accepted:2021-03-07 Published:2021-09-16
  • Contact: LIU Jing-xian
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Abstract: The filtration performance of bag filter for fly ash from power plants can be improved by unipolar charger. In this paper, hybrid electrostatic filter comprised of pre-charger and fibrous filter were designed and manufactured. Under different charge types, applied voltages and flow velocities, collection efficiency and pressure drop of PPS fibrous filter for unipolarly charged fly ash particles were investigated. The results indicated that with the increase of the applied voltage and the decrease of filtration velocity, the collection efficiency of bag filter is improved, and the growth rate of pressure increment is significantly reduced. The smaller the particle size, the more obvious the increase in the filtration effect, and the improvement effect of negatively charged particles is better than that of positively charged particles.

Key words: coal-fired fly ash; fibrous filter; unipolar charging; collection efficiency; pressure drop

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