工业烟气中粒径10 μm以下的微细颗粒物通过静电除尘器捕集效率较低，以烧结烟气中微细粉尘为研究对象，采用化学团聚协同作用提高静电除尘效率。选取聚丙烯酰胺（PAM）、葡甘露聚糖（KGM）和聚合氯化铝（PAC）3种絮凝剂考察其团聚效果。结果表明，化学团聚作用显著增大了微细颗粒平均直径，其中PM10粒级的颗粒体积分数最高减少了75.608%；3种絮凝剂中KGM团聚效果最好，团聚前、后粉尘峰值粒径分别为11.565、37.825 μm；在选取的浓度范围内，絮凝剂质量浓度越高团聚效果越好；烟气温度变化对PM2.5级别颗粒团聚效果的影响不是很显著。通过正交试验分析得出，当入口烟温为100℃、絮凝剂KGM质量浓度为0.1 g/L时，粉尘颗粒物峰值粒径达到40 μm左右，除尘效果可达到97%以上。

Common electrostatic precipitators usually give a lower collecting efficiency in removing the fine particulate below 10 μm in industrial flue gas.Taking fine dust in sintering flue gas as the research object,the synergistic effect of chemical agglomeration is utilized to help electrostatic precipitator improve removal efficiency to fine dust.Three kinds of flocculants are selected,including polyacrylamide (PAM),glucomannan (KGM) and polyaluminum chloride (PAC).The results confirm that chemical agglomeration can significantly increase the average diameter of fine particles,especially the maximum reduction of volume fraction of PM10 particles is 75.608%.Among three kinds of flocculants,KGM shows the best effect,over which the peak particle diameters of the dust before and after agglomeration is 11.565 μm and 37.825 μm,respectively.Within the selected concentration range,the higher the concentration of flocculants,the better the agglomeration effect.Flue gas temperature has little impact on the agglomeration effect of PM2.5 grade particles.Through orthogonal test analysis,the peak particle size of the dust will reach around 40 μm and the dust removal efficiency can exceed 97% under the conditions that the temperature of flue gas at inlet is at 100℃ and KGM concentration is 0.1 g·L^-1.

李海英(1971-),女,博士,教授,研究方向为工业节能与环境保护,hblglhy@sina.com