【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.更多还原

【Abstract】 Traditional dust removal equipment is difficult to remove sub-micron dust effectively while electrostatic 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.更多还原