除尘滤料对微细颗粒捕集性能的研究

Research on Fine Particle Capture of Baghouse Filter Media

工业粉尘排放是大气中微细颗粒尤其PM2.5的主要来源之一,袋式除尘器中的滤料是颗粒捕集的关键。以实验手段,系统研究了几种典型针刺毡及覆膜滤料的阻力特性、全尘捕集效率及微细粉尘捕集效率。数据显示,滤料在老化后阻力增加,覆膜滤料增幅最小;常规滤料在洁净状态时对全尘的效率超过99.9%,老化稳定后效率在99.99%以上;尽管滤料对全尘的效率很高,但其对10μm颗粒的效率在94%～99%之间,对2μm的效率在52%～92%之间。

Industrial dust emission is one of the main sources of fine particle especially for PM2.5 in atmosphere. Filter media in baghouse is the key component for particle capture. In the paper, several typical needle felts and membrane filters are studied by means of experiments. The performances of falter such as resistance, capture efficiency for total particle and efficiency for fine particle are tested. It was indicated by the results that the resistance of filter increased after aging, increasing rate of membrane filter was the smallest. The efficiencies of normal filters were above 99.9% for clean state, and 99.99% for stable state after aging. Although the falters had high efficiency for total particle, but the efficiency for 10p^m particlewas 94%-99% and for 21~m was 52%-92%, the filter need to be improved.