ESP电场粉尘非稳态收集过程数值仿真  

Numerical Simulation of Non-steady Dust Collection Process in Electric Field of Electrostatic Precipitator

作　　者：郝文阁[1] 裴莹莹[1] 侯亚平[1] 熊郝旺[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2008年第8期1179-1182,共4页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2002AA642010)

摘　　要：基于ESP电场荷电粒子非稳态收集理论,得出非稳态收集过程中驱进速度的计算方法.根据紊流传质原理,推导出紊流掺混系数的表达式,并且针对收尘极板表面存在层流边层的事实提出新的极板处边界条件.对于粉尘非稳态收集过程的二维粒子输运方程,采用有限差分方法,运用逐次超松弛迭代法构造静电除尘输运方程的差分格式,利用Matlab仿真语言进行数值仿真,得到静电除尘器电场非稳态粉尘收集过程中不同时刻粉尘粒子的质量浓度分布规律,并根据断面质量浓度分布得出分级效率.对模型不同断面的粉尘质量浓度的实测结果与模拟结果进行比较,二者吻合较好.基于非稳态收集过程的数值模拟得到的收集效率比传统理论计算结果更加准确.Based on the theory of non-steady electrostatic collection of charged particles, the particle migration velocity during the non-steady collection was calculated. According to the mass transfer theory of turbulent flow, an expression of turbulent mixing-diffusing coefficient was derived, and a new boundary condition at counter electrode was deduced on the basis of boundary layer theory. Then, the 2-D turbulent mixing-diffusing equation of particles during non-steady electrostatic dust collection was given in difference scheme by the finite difference method and stepwise super-relaxation iteration method. With the numerical simulation carried out by Matlab, how the mass concentration of dust particles are distributed at different time during non-steady dust collection by ESP （electrastatic precipitator） was obtained, as well as the dust classification efficiency in accordance to the sectional distribution of mass concentration. The comparison between measured and simulated results of different sectional dust concentrations showed that they conform well with each other. A conclusion is thus drawn that the dust collection efficiency calculated in this way is more accurate than that by conventional theoretical calculation.

关 键 词：非稳态收集 紊流传质 边界条件 有限差分方法 收尘效率 

分 类 号：X701[环境科学与工程—环境工程]