双区静电除尘器的除尘效率影响因素和理论公式研究

Influence factors and theoretical equation study for dust removal efficiency of two-stage electrostatic precipitator

研究了预荷电压、烟气流速、极板间距和电极型式对双区静电除尘器除尘效率的影响,推导了双区静电除尘器的除尘效率理论公式,并与实验值和多依奇公式计算值进行了对比验证。结果表明,双区静电除尘器的除尘效果好于单区静电除尘器,其最佳工况是预荷电压25kV,烟气流速0.50m/s,极板间距400mm,采用芒刺电极。推导得到的双区静电除尘器的除尘效率理论公式不仅收尘电压较低时与实际情况相符,而且收尘电压较高时也与实际情况基本吻合,比多依奇公式更能反映双区静电除尘器的除尘效率。

The influences of pre-charge voltage, flue gas velocity, plate-wire distance and electrode type on dust removal efficiency of two-stage electrostatic precipitator were studied. The theoretical equation for dust removal effi- ciency of two-stage electrostaic precipitator was deduced,and compared with the calculation results of Deutsch equa- tion and experimental results. Results showed that the dust removal efficiency of two-stage electrostatic precipitator was higher than that of single-stage electrostatic precipitator. The best conditions were achieved when pre-charge volt- age was 25 kV,flue gas velocity was 0.50 m/s and plate-wire distance was 400 mm with nail electrode. The theoretical values of the dust removal efficiency calculated by the theoretical equation were better to reflect the actual situation both at low and high dust collection voltage compared with that calculated by Deutsch equation.