摘要
采用传统除尘设备很难有效清除亚微米粉尘,而静电凝并是净化亚微米粉尘的有效方法.设计了一种静电凝并试验装置,以电厂飞灰为实验粉尘,对其荷电性能及凝并沉积性能进行了试验研究.飞灰粉尘直径在0.5-10μm之间,绝大多数在2-10μm之间.试验结果表明：荷电颗粒的荷质比随荷电电压值的升高呈现非线性方式增长,粉尘颗粒更容易荷负电;凝并沉积效率随风速的增大及浓度的减小而增加,随荷电电压绝对值的升高而增加;在双极非对称荷电组合电压＋25 kV/-23 kV时具有最高的凝并沉积效率.荷电后粉尘的粒径分布情况表明,在荷电段出口处,10μm以上颗粒的粒径频率分布有了明显的增加.
Traditional dust removal equipment is difficult to remove sub-micron dust effectively while e- lectrostatic coagulation is an effective way to clean sub-micron dust. By designing a test-bed and using fly-ash as experimental dirt, performance of charge and deposition was studied. Result shows a non-liner rise of charge-mass ratio with charging voltage ascending, an increase of coagulation-deposition efficiency with wind speed increasing, concentration debasing and charging voltage rising, and the highest coagulation-deposition efficiency at ＋ 25 kV/-23 kV under asymmetrical bipolar charging voltage. The distribution of the diameter of the dust after charging shows that, in the entry, the dust diameter of 10 μm is increased markedly.
出处
《排灌机械》
EI
2009年第5期337-340,共4页
Drainage and Irrigation Machinery
基金
江苏省自然科学基金资助项目(BK2007095)
关键词
气固两相流
静电
亚微米
凝并
沉积效率
gas-solid two-phase flow
electrostatic
sub-micron
coagulation
deposition efficiency
