Cost-Efficiency Analysis of a Model Wire-Plate Electrostatic Precipitator via DNS Based Eulerian Particle Transport Approach

摘要

The object of this work is to outline a methodology that can improve the current procedures used to size cost-optimized,Efficient electrostatic precipitators (ESP).Focusing on a model wire-plate ESpP initially,we develop a two-dimensional Eulerian,advectiondiffusion type model for particle transport with distributed parameters.The Eulerian modelis assessed against the accurate lagrangian particle tracking database obtained for a model ESP using the parameter-free,higly accurate direct numerical simulation dtabase aobtained in previous work (Soldati 2000;Soldati and Banerjee 1998).Results shwo that the simplified Eulerian model can have good performances.Provided that the functinal form of the resqired transport parameters(i.e.,turbulent dispersion coefficient,electromigration velocity,and convection velocity)are properly defined.Next,the cost function ofr a model ESP is defined and the influence of several degign parameters on cost and collection efficiency is examined to identify guidelines to increase the collection efficiency at the lowest cost.Considering the cost associated with variatio of precipitator lentgth and width,wire-to-plate sistrnce,and voltage applied to the wires,results show that the most costeffecteve way to increase the collection efficiency of a wire-plate ESP is to decrease the sire-to-wire distrance.urthermore,the reasons for cost effectiveness of wider-spacing ESPs are demonstrated from a theoretical viepoint,thus confirming the experimental observations of Navarrete et al.(1997).