预混喷雾增效细颗粒去除的电除尘实验研究

为提高电场对细颗粒物的捕集效率,实现颗粒物超低排放要求,本试验采用喷雾与电场分区设计,搭建了预混喷雾湿式电除尘试验装置,以增强颗粒与液滴之间的凝聚作用,试验探究了电场电压、极板间距、电场风速、喷雾压力及入口浓度等参数对除尘效率的影响规律.结果表明;除尘效率随着电场电压增加,除尘效率提升,增幅先升高后降低,最后趋于平稳;减小极板间距或电场风速,能够提高除尘效率,但降低了处理风量;随着喷雾压力增大,除尘效率先增加后减小,当压力值为6MPa时,除尘效果最佳;粉尘入口浓度对除尘效率的影响程度较低,对于粒径小于2.5μm的颗粒物去除效率最高达98.5%.综上,预混喷雾湿式电除尘效果相比单一喷雾或静电除尘具有显著的增强,对于颗粒物超低排放装置的设计具有重要参考价值.

Experimental study on electrostatic precipitator removal of fine particles with pre mixed spray

In order to improve the collection efficiency of fine particles via electric field and achieve the requirement of ultra-low emission of particles, a novel pre mixed spray electrostatic precipitator was designed by separating the spray part and electronic field to enhance the agglomeration between particles and droplets. The influence of electric field voltage, plate spacing, air velocity, spray pressure and inlet dust concentration on the efficiency of dust removal was investigated in detail. The results showed that with the increase of voltage, the dust removal efficiency increased, the increasing tendency raised quickly and then slowed down to steady state. Reducing the distance between plates or the wind speed could raise the dust removal efficiency while the treatment air volume reduced. With the increasing of spray pressure, the dust removal efficiency increased firstly and then decreased. When the pressure value was 6MPa, the dust removal effect showed the largest value. The influence of inlet concentration of dust on the removal efficiency was quite low, the removal efficiency of particles with the size less than 2.5μm was large as 98.5%. In summary, the dust removal efficiency of pre mixed spray electrostatic precipitator was significantly enhanced compared with that of single spray or electrostatic precipitator, which has significant reference value for the design of ultra-low particulate emission devices.