新型PTFE熔融喷冲纤维微孔膜滤料制备及除尘机理研究  

Research on the preparation and dust removal mechanism of new PTFE melt-punched fiber microporous membrane filter media

作　　者：陈宜华 邱树永 郭敬中 吕真虎 王攀 贾勇 CHEN Yi-hua;QIU Shu-yong;GUO Jing-zhong;LÜZhen-hu;WANG Pan;JIA Yong(School of Energy and Environment,Anhui University of Technology,Anhui Ma’anshan,China 243000;School of Energy and Environment,University of Science and Technology Beijing,China 100083,China)

机构地区：[1]安徽工业大学能源与环境学院,安徽马鞍山243000 [2]北京科技大学土木与资源学院,北京100083

出　　处：《中国环境科学》2023年第3期1064-1073,共10页China Environmental Science

基　　金：国家“973”计划项目(2017YFC0805204)。

摘　　要：针对金属矿山粉尘治理常用的覆膜滤料清灰效果不佳及微细粉尘超低排放的的问题,研制了PTFE滤材浸染熔融改性法制备出适应范围广、低阻高效的熔融喷冲纤维微孔膜,采用PTFE熔融喷冲纤维微孔膜滤料制作工艺与FE-SEM纤维结构重组CFD-DEM耦合数值模拟仿真技术方法相结合的方式,分析该微孔膜滤料的制备工艺、过滤特征及除尘附着特性.结果表明:通过加压浸染及加热烘烤处理制作的纤维微孔膜滤料,药剂在PTFE喷丝骨架上生长出细丝绒毛结构,增大了滤料的填充率SVF和超微细粉尘的过滤效率,特别第三组配方的滤料,对微细粉尘(d≤10μm以下)颗粒物除尘效率由原来的95.5%提高到99.3%;数值模拟进一步验证了该滤料的物理特性,并结合FE-SEM微观附着粉尘状态分布,分析该新型滤料的微观除尘表现及粉尘附着状态分布.Towards both the problem of poor ash cleaning effect of coated membrane filter material commonly used in metal mine dust treatment and the basic requirements of ultra-low emission of ultra-fine dust,PTFE filter media immersion melt modification method was developed to prepare the melt-jet-punched fiber microporous membranes with a wide range of adaptability and low resistance and efficiency.PTFE melt-punched fiber microporous membrane production process was combined with the FE-SEM fiber structure recombination CFD-DEM coupling numerical simulation technology method,via which the filtration characteristics and dust removal surface characteristics of the microporous membrane filter material were analyzed.The results show that the fiber microporous membrane filter material made by pressure impregnation dyeing and heating baking treatment could provide the fine sericillary structure on the PTFE spray wire skeleton,which increased both the filling rate of the filter material(SVF)and the filtration efficiency of ultra-fine dust,especially for the third group of filter materials,the dust removal efficiency of fine particulate matter below PM10was increased from 95.5%to 99.3%.We further verified the physical properties of the filter media by numerical simulation,and analyzed the microscopic dust removal performance and dust adhesion state distribution of the new filter media by combining FE-SEM microscopic dust adhesion state distribution.

关 键 词：熔融喷冲纤维微孔膜 滤料性能 数值模拟 CFD-DEM 分级效率 

分 类 号：X701[环境科学与工程—环境工程]