扩缩板对静电除尘器颗粒脱除影响

Effect of Expanded-Contracted Plate on Particle Removal of Electrostatic Precipitator

提出了一种具有扩缩板结构的线板式静电除尘器,并运用数值模拟方法研究了在不同电压、进口气速和颗粒粒径条件下,扩缩板不同排列方式对电场强度分布、气流场、颗粒轨迹和收尘率的影响,并与平行板式静电除尘器进行比较。结果表明,扩缩板扩展了收尘极的表面积,增强了收尘极附近电场强度,并随其高度的增加,电场强度和影响范围随之增大,因其产生的低速涡旋有助于延长颗粒的滞留时间,利于颗粒脱除。总体上,带有扩缩板结构的静电除尘器收尘率优于平行板式静电除尘器。

In this paper,a wire-plate electrostatic precipitator with expanded-contracted plates(ESP-ECP)was proposed.A numerical method was adopted to investigate the influences of different arrangements of ECP on the electric field intensity,airflow field,particle trajectory and collection efficiency under different voltages,inlet gas velocities and particle sizes.Furthermore,it was compared with the traditional ESP with parallel plates(ESP-PP).The results indicated that the ECP expands the surface area of the collecting electrode,and effectively enhances the electric field intensity near the collecting electrode.With the increase of the ECP height,the electric field intensity and influence range increase.The low-velocity vortices generated by the ECP help to prolong the retention time of particles,which is conducive to particle removal.In general,the collection efficiency of the ESP-ECP is superior to the ESP-PP.