聚乙烯三氟氯乙烯熔喷非织造材料的制备及其过滤性能

为制备耐高温熔喷过滤材料以应对高温工业粉尘的污染问题,研究了聚乙烯三氟氯乙烯(ECTFE)的热性能、动态热机械性能、流变性能以及形貌,并选取合适的工艺参数成功制备得到ECTFE熔喷非织造材料,对ECTFE熔喷非织造材料的结构与高温处理下的过滤性能进行表征,结果表明:ECTFE熔喷非织造材料纤维网中的纤维呈现随机交错、缠绕排列,其纤维直径分布在4~12μm,平均直径约为7.12μm,其孔径主要分布在45~55μm;当将ECTFE熔喷非织造材料从150℃预加热到210℃并用于过滤后,其对PM_(10)的过滤效率均保持在99.96%,而对PM_(2.5)和PM_(5)的过滤效率随着ECTFE熔喷非织造材料预加热温度的升高逐渐降低,但仍能够保持在55.16%以上。

工业除尘过滤材料的分级过滤效率实验研究

PM 2.5已经成为热门话题,然而严重影响我们健康的PM0.5却被忽略。分类过滤效率反映了工业粉尘过滤材料对不同粒径微粒的过滤效率,可评价过滤材料对PM 2.5以下微粒的过滤效率。本文研究了滤料厚度,克重,平均纤维直径,平均孔隙大小等参数与分级过滤效率的关系。结果表明,工业粉尘过滤材料对PM 2.5有良好的过滤性能,可以达到90%,但对PM 0.5点过滤性能较差,从30%到70%不等;孔隙大小对过滤性能没有显著影响;平均纤维直径有显著影响过滤阻力,平均纤维直径变小,过滤效率增加,但阻力也增加;乳剂处理可以提高滤料对PM 0.5的过滤性能。

A Study on Enhancement of Filtration Process with Filter Aids Diatomaceous Earth and Wood Pulp Cellulose

In this paper, a study to enhance the filtration for solid/liquid materials difficult to be filtered, such as highly viscous, highly compactible or gel like materials, is presented. Filter aids diatomaceous earth and wood pulp cellulose are used to enhance the filtration by improving filter cake structure and properties in the filtration of a biological health product and a highly viscous chemical fiber polymer melt product. The property of solid/liquidsystems, filtration at different flow rates, specitic cake resistance, cake wetness, filtration rate, filtrate turbidity for filter aid selection and evaluation, and operation optimization are investigated. The results are successfully applied to industrial process, .and can be used as a reference for similar filtration applications.