Regulation And Flow Field Optimal Design Of Flue Gas Velocity And Particle Distributions For Low Low Temperature Electrostatic Precipitator System

Excessive amounts of fine particles in the atmosphere cause serious harm to human-beings and environment.In recent years,the content of fine particles in the atmosphere is gradually increasing,frog and haze problem is becoming more and more serious.The main source of fine particle emissions is coal-fired power plant.With the strict execution of laws related to fly ash emission of the state,ultra low emission electrostatic precipitator technology has been widely noticed and rapidly developed.In this thesis,the arisen low low temperature electrostatic precipitator technology(LLT-ESP)is researched by computational fluid dynamic(CFD),including regulation solutions of flue gas velocity,fly ash particle field and flow field optimal design of ultra low precipitator.This thesis mainly researched some complex structures based on a power plant 900 MW unit LLT-ESP projects.The main research objects are cooler system funnel,heater system funnel and horn inlet of ESP.The research results indicated that deflector optimal design for the above complex structures solved the problems such as uneven distribution of flow and gas velocity,realized effective control to flue gas velocity field and improved efficiency of dust collection.In addition,primary research on particle motion simulation in ESP is done.Processes in dust collection are modeled respectively,realized coupling calculation of flow field,electric field and particle field.The factors which may influence efficiency of dust collection are analyzed and discussed,the result can provide reference to ESP’s design and operating maintenance.