烟气温度对电除尘器性能影响的数值模拟

采用计算流体动力学(CFD)软件对电除尘器进行三维数值模拟研究,通过自定义函数(UDF)实现电场、流场、颗粒场和温度场的4场耦合,研究烟气温度对电除尘器电场特性、流场特性和除尘效率的影响.结果显示:入口烟气质量流量相同时,当烟气温度从20℃上升到400℃时,平均电场强度从4.9×105V/m减小到1.4×105V/m,...

Numerical simulation of the effect of temperature on the performance of electrostatic precipitator

To elucidate the effect of flue gas temperature on the performance of the electrostatic precipitator, a three-dimensional numerical simulation study of the electrostatic precipitator was conducted through commercial Computational Fluid Dynamics (CFD) software. The overall coupling of electric field, flow field, particle field, and temperature were successfully created through a User Defined Functions (UDF). The results showed that the average turbulence intensity could be reduced with the increase of the flue gas temperature that ranged from 20℃ to 400℃ under the same inlet mass. In addition, it was explored that the average field strength would decrease from 4.9×10⁵V/m to 1.4×10⁵V/m, and 0.971mA/m² to 0.261mA/m² for the average plate current density under the same condition, and the ion wind effect was decreased as well. However, the uniformity of the plate current density distribution gradually improved with the temperature increase. More importantly, the particle trajectory line was elongated with the increased temperature under the same volume flow, but the overall particle capture efficiency was decreased. It can be summarized that the decreased temperature could effectively improve the dust removal efficiency of the electrostatic precipitator.