袋式除尘器内气流场数值模拟

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1、西南交通大学研究生学位论文年姓级二O0四级名沈强申请学位级别壬掌}兰廿专业孥蕉兰堡指导教师墨塑型耋：叁二OO七年四月西南交通大学硕士研究生学位论文第1I页AbstractAstheeconomydevelopinginahigllspeed，吼vironmentalproblembecomemoreandmoreimportantinourcountry．Andsootisoneofthemainkindsofairpollutantsbecausecoalisourmainenergysource．With

2、pcoplerealizingtheimportantofenvironmentprotection,bagfilterisbeenusedandstudiedfarandwide．Inthefieldofbagfilterresearch，itisalwaysthefocusquestiontodecreasethepressuredropandincreasethefiltrationefficiency．Guaranteeofthefiltrationefficiencyisnecessaryforab

3、agfilterproject，andthepressuredropiscloselyrelated谢tIlthecost，suchasenergyconsumption，equipmentloss．Formanyyearsresearchandexperience，peoplegetsomelawsaboutfiltrationefficiencyandpre$suredrop．Insidethebagfilter,thegasflowimpacttheefficiencyandpressure．Asthe

4、fluidisinthesectionwithcomplexboundaryfigure，themg硒ureforitisveryhard．Inaddition,duetothelimitationofphysicalmodeltest，theexperimentCallonlyaffordtheparameterforwholeflow,whilethenumericalsimulationCanofferthedetailedinformationforcorrelativeflow．Becauseoft

5、hesestrongpointsinnumericalsimulation,ithasbecomealleffectivemeansforfluiddynamics．Inthispaper,numericalsimulationaboutvelocityfieldandpressurefieldofgasflowinbagfilterwillbedoneassistedbyFluent，oneofComputationalFluidDynamics(cFD)seflwares．Accordingtothesi

6、mulationresult，theseisajetairstreamdisplayedclosetotheinlet．Anditimpactthebottomofseveralbagstrongly．Italsomakethegasflowvelocitydistributingasymmetrically,furthermore，causethepressuredropincreased．Inordertoreducetheimpactonthebottomofthebag，improvetheflowd

7、istributingandlowerthepressuredrop，theauthoruseairflow-distributionplate，flowguideplateandincreasetheinletarea，Keywords：bagfilter,numericalsimulation,FluenLvelocityfield,pressurefield西南交通大学硕士研究生学位论文第1页第1章绪论随着科技水平的提高和经济实力的增长，人们的环保意识不断提高，国际环保组织和国家主管部门对环保的法规和要

8、求也在日趋完善和严格。而目前，伴随着我国经济的高速发展，我国也成为世界上大气污染最严重的国家之一，特别是在工业、人口集中的城市，污染程度更为严重。由于我国是一个以煤炭为主要能源的国家，煤炭在一次能源结构中的比例占到了75％以上【lj，大气污染依然是以烟尘为主的煤烟型污染【2】。因此，对烟尘、粉尘的治理也是大气污染控制的重点。袋式除尘器是最早出现的除尘设备之一，也是干式除尘设备中净化效率最高，应用最为