微纳米纤维复合滤纸反吹性能的研究

Study on the Back-blowing Performance of Micro/Nano-fiber Composite Filter Paper

关键词:  空气过滤  复合滤纸  反吹性能  微纳米纤维

Key Words:air filtration  composite filter paper  back-blowing performance  micro/nano-fiber

摘要:本研究探讨了3种微纳米纤维复合滤纸在不同面流速及发尘浓度条件下的反吹性能，主要对初始过滤效率接近的湿法纤维复合滤纸、熔喷纤维复合滤纸和静电纺纤维复合滤纸的性能进行了对比研究。结果表明，在面流速11.1 cm/s、发尘浓度1 g/m³时，没有反吹的情况下，湿法纤维复合滤纸、熔喷纤维复合滤纸和静电纺纤维复合滤纸的一次容尘量分别为85.3、84.8、64.1 g/m²；而容尘性能不佳的静电纺纤维复合滤纸在反吹过程中表现优异，完成30次反吹清灰用时约3700 s，是一次容尘实验时用时的13.8倍，终止时阻力为554 Pa；湿法纤维复合滤纸与熔喷纤维复合滤纸的反吹用时分别为2587、2527 s，明显低于静电纺纤维复合滤纸，终止阻力分别为854和724 Pa。随着面流速从11.1 cm/s提高至19.4 cm/s，或发尘浓度由1 g/m³增加至4 g/m³时，滤材的反吹清灰用时均急剧下降。

Abstract:The back-blowing performance of three kinds of micro/nano fiber composite filter paper at different surface flow rate and dust generation concentrations were investigated in this paper， and properties of the wet fiber composite filter paper， meltblown fiber composite filter paper and electrostatic spinning fiber composite filter paper with similar initial filter efficiency were mainly compared. The results showed that at a surface flow rate of 11.1 cm/s and a dust generation concentration of 1 g/m³， under the condition without back-blowing， the primary dust holding capacity of the wet fiber composite filter paper， the meltblown fiber composite filter paper and the electrostatic spinning fiber composite filter paper were 85.3，84.8， and 64.1 g/m²， respectively. However the electrostatic spinning fiber composite filter paper with poor dust holding performance had excellent back- blowing performance. It took about 3700 s to complete 30 times of back-blowing， which was 13.8 times of a dust holding test time， with the final resistance of 554 Pa. The back-blowing time of wet fiber composite filter paper and meltblown fiber composite filter paper were 2587 and 2527 s， respectively， significantly lower than the electrostatic spinning fiber composite filter paper， with the final resistance of 854 and 724 Pa. With the increase of the surface flow rate from 11.1 cm/s to 19.4 cm/s， or the increase of the dust concentration from 1 g/m³ to 4 g/m³， the back-blowing time of the filter media decreased sharply.