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Dynamic flowsheet simulation of re-entrainment from particle layers formed inside electrostatic precipitators

查看全文 作　　者：Soren [1]Sander;Udo [1,2]Fritsching 高影响力作者 机构地区：[1]Particles and Process Engineering,University of Bremen,Bibliothekstrasse 1,28359 Bremen,Germany;[2]Process Engineering,Leibniz-lnstitutfiir Werkstofforientierte Technologien-IWT,Badgasteiner Strasse 3,28359 Bremen,Germany高影响力机构 出　　处：《Particuology》索引2020年第18卷第6期,共7页高影响力期刊 摘　　要：Electrostatic precipitators clean away the particulate matter of exhaust gases in manifold industrial processes.Parameter studies of particle separation in the size range of several 100 nm to 25μm is of particular interest for the prediction of precipitation efficiencies and emissions.Models typically cover the transport of particles towards walls of the precipitator.However,no model yet covers the possible re-entrainment of particles from layers formed at the walls back into the gas flow.This study presents the implementation of a new time-resolving model for electrostatic precipitation utilizing a re-entrainment model.Experimental data support the results of modelling.The model uses a statistical approach based on properties of the particulate layer forming at the precipitator walls.The model is used for the analysis of the redispersion of particles in a laboratory-scale electrostatic precipitator(Sander,Gawor,&Fritsching,2018).Results show reduced precipitation efficiencies for particles larger than 5μm as particles have higher kinetic impact energies and lower bounding energy at the layer surface.Time dynamics reveal a steady-state behavior of the separation for CaCO3(limestone,trademark'Ulmer WeissR')while Al2O3(trademark'Pural NFR')precipitation is affected by layer buildup at the walls increasing over several minutes. 关 键 词：Electrostatic precipitator Flow sheet model Redispersion and re-entrainment Gas cleaning Particle layer
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