电极配置和操作条件对静电油烟净化效率的影响

Effects of electrode matching and operation condition on the oil fume removal by electrostatic technology

以有机气溶胶发生器产生的0.02~2.02μm癸二酸二辛酯颗粒模拟餐饮业排出的油烟PM_(2.5)组分,利用静电低压撞击器颗粒物检测仪测定各粒径范围的颗粒个数和质量浓度,并系统研究了电极配置、电场风速和供电电压等因素对静电油烟净化效率的影响。结果表明:油烟荷电量以及荷电颗粒迁移距离是影响净化效率的关键因素,优化电极配置的增效作用明显;提高荷电区电离电压对油烟净化的增效作用大于提高收尘区电压;0.13~0.23μm粒径范围的油烟最难去除,其分级净化效率直接影响总净化效率;降低电场风速或增加串联模块数可增大油烟在电场的停留时间,继而提高净化效率。工程设计中,可根据安装空间和处理气量波动等实际情况,合理匹配串联模块数和电场风速,提高效益费用比。

The performance of oil fume removal by electrostatic precipitation and the effects of electrode matching,electric field wind velocity,ionization and collection voltages on the removal efficiency are systematically investigated in this study.Dioctyl sebacate(DOS)aerosol in the range of 0.02~2.02μm produced by an aerosol generator is used to simulate the oil fume.The number and mass concentration of particles are measured by an Electrical Low-Pressure Impactor plus(ELPI+)particle detector.Results show that the charging amount and migration distance of oil fume are the key factors affecting purification efficiency.Optimizing electrode matching significantly increases the purification efficiency.The purification efficiency is better enhanced by increasing ionization voltage in the charging zone than increasing collecting voltage in the collection zone.It is difficult to remove particles of 0.13~0.23μm in diameter in the oil fume and its graded purification efficiency greatly affects the overall purification efficiency.The decrease in wind velocity of the electric field or increase in the number of modules in series can increase the residence time of oil fume in the electric field and thus improve the purification efficiency.The benefit-cost ratio of applying the oil fume purification system can be enhanced by scientifically matching the electric field wind velocity and the number of modules according to the allowed construction space and the flue gas fluctuation.