外电场作用下R-R分布的荷电颗粒的凝聚

静电除尘器中入口飞灰颗粒群的粒径分布一般符合R-R分布。该文采用分段数值模拟的方法,将控制方程在计算域内按照质量和荷电量离散,研究外电场作用下初始粒径分布符合R-R分布,同一粒径的颗粒荷电量符合Boltzmann平衡电荷分布的荷电颗粒的凝聚。结果表明:荷电颗粒群经历外电场作用下的凝聚过程后,其粒径分布仍然保持R-R分布状态,只是平均粒径加大,粒径分布更加集中;同一粒径的颗粒荷电量仍然保持Boltzmann平衡电荷分布。静电除尘器各电场间增加凝聚场以降低燃煤锅炉可吸入颗粒物污染是可行的。

Coagulation of charge particles with an R-R distribution in an electric field

The size distribution of fly ash particles entering an electrostatic precipitator normally follows an R-R distribution. A sectional numerical model was used to solve the control equations for the particle mass and charge distributions to study the coagulation of fly ash particles with the R-R mass distribution with the charges having a Boltzmann distribution. The results show that the mass distribution of the coagulated ash particles still follows the R-R distribution and the same size particles have a Boltzmann charge distribution. The mean particle size increases and the distribution becomes narrow after coagulation in the electric field. Therefore, coagulation should be used between electrostatic precipitator fields to reduce superfine particle pollution from coal burning boilers.