燃煤飞灰单极荷电对纤维滤料过滤性能的强化

细颗粒物的单极荷电能够改善细颗粒物被纤维滤料过滤的性能.本文设计搭建了由线板式预荷电器和纤维滤料集尘装置组成的复合静电增强过滤实验平台，分别研究了在不同荷电类型、不同荷电电压以及不同过滤风速三种工况下，单极荷电的燃煤飞灰颗粒被聚苯硫醚(PPS)纤维滤料捕集时捕集效率及阻力特性的变化规律.结果表明，随着荷电电压的升高，过滤风速的下降，纤维滤料对荷电燃煤飞灰颗粒物捕集效率提高的同时压差增量减小，且压差增长速率明显降低.粒径越小，过滤效果增加越明显，且负荷电提高效果优于正荷电.

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

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.