有机固废燃烧烟气中PM2.5的过滤比较研究

垃圾焚烧是PM_2.5的重要来源之一，目前焚烧烟气系统中无有效去除PM_2.5的控制单元.在实验室探究了几种过滤介质对木屑、猪五花肉、污泥这3种有机质固体废物燃烧产生的PM_2.5的去除效果.这几种过滤介质包括：涤纶针刺毡、聚四氟乙烯（PTFE）覆膜滤料、偏聚氟乙烯（PVDF）微滤膜、石墨烯及其组合.PTFE覆膜滤料+PVDF微滤膜的组合对木屑燃烧产生的PM_2.5的过滤效果最好，可以达到97.45%.双层PVDF微滤膜对猪五花肉和污泥燃烧产生的PM_2.5过滤效果都最好，分别为99.39%和98.03%.根据实验结果和SEM-EDS分析，PVDF微滤膜对碳组成的颗粒有较高的选择性截留效果.叠加使用过滤介质可以提高对PM_2.5的过滤效率，但双层过滤可能会增加阻力，不利于对大量废气进行除尘处理.

Comparative study on filtration of PM2.5 in combustion flue gas of organic solid waste

Waste incineration is one of the important sources of PM_2.5. At present, there is no control unit for the effective removal of PM_2.5 in the flue gas system. In this paper, the removal effect of several filter media on PM_2.5 produced by the combustion of three kinds of organic solid wastes, namely sawdust, pork and sludge, was studied. These filter media are polyester knitting fabric, polytetrafluoroethylene (PTFE) fabric, polyvinylidene fluoride (PVDF) micro-filtration membranes, graphene and their combinations. The combination of PTFE fabric and PVDF micro-filtration membrane has the best filtration effect on PM_2.5 produced by sawdust burning, which can reach 97.45%. The filtration effect of double layer PVDF micro-filtration membrane on PM_2.5 of pork and sludge burning are 99.39% and 98.03%, respectively. According to the experimental results and SEM-EDS analysis, PVDF micro-filtration membrane has a high selectivity retention effect on particles made of C. The combined use of filter can greatly improve the filtration efficiency of PM_2.5. However, double-layer filtration may increase resistance, which is not conducive to a large number of exhaust gases for dust treatment.