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119Vol．11No．920179ChineseJournalofEnvironmentalEngineeringSep．20172016－10－092016－12－221990—。E-mailseudzz@126．com*12*1111.3100302.310030660MWSCＲ。SCＲ。65°30°38.6%48.4%192Pa。SCＲX511A1673-9108201709-5104-06DOI10.12030/j．cjee．201610024NumericalsimulationoneffectofashremovalbyaddingbaffleatoutletofeconomizerZHAODazhou12*LIYunchao1ZHENGWenguang1HESheng11.HuadianElectricPowerＲesearchInstituteHangzhou310030China2.ZhejiangProvincialKeyLaboratoryofEnergyStorageandBuildingEnergy-SavingTechnologyHangzhou310030ChinaAbstractAthreedimensionalnumericalmodeloffluebetweentheoutletofeconomizerandtheinletofSCＲof660MWpowerunitwasestablishedthemotionlawofflyashparticleswasstudiedbythemodel．Theresultsshowthattheincidentpositionofflyashparticleswhichbiasedtowardstherearoftheoutletofeconomizerandwithlargediameterswereeasilytrappedbythehopper．Theincidentpositionofflyashparticleswhichbiasedto-wardsthefrontoftheoutletofeconomizerandwithlargediameterscanbetrappedbyaddingabattleattheoutletofeconomizermeanwhiletheflyashcapturerateofthesystemwasalsoincreasedatthispointtheSCＲinletductisdesignedtoupwardcanreducethepressuredropofthesystem．Whenthebaffleangleis65°horizontalflueinclinationangleis30°theflyashcapturerateofthesystemincreasedfrom38.6%to48.4%thepressuredropofthesystemincreasedby192Pa．KeywordsSCＲbafflecaptureofflyashnumericalmodelNOx。selectivecatalyticreductionSCＲ、1-2。SCＲSCＲ、3-5。6-7。、SCＲ。8600MW9SCＲ9660MWSCＲSCＲ10SCＲ11670MW12、、。。SCＲ。11.11Fig．1Schematicdiagramofflue660MWSCＲ。14000mm×9262mm3800mm×9262mm。1GAMBIT302。1.21.2.1、、、k-εdivρuφ=divΓgradφ+S12Fig．2Griddivisionρkg·m－3um·s－1φΓS。1.2.2、Basset、Saffman132dupdt=FDu－up+gρp－ρρp2FD=18μρpd2pCDＲe243um·s－1upm·s－1FDu－upρpkg·m－3ρkg·m－3gm·s－2μPa·sＲeCD1410ＲeCD1。FLUENTUDFDEFINE_DPM_DＲAG。1.2.3-FLUENT。155015111Table1CDoffullrangeＲeonsphericalparticleＲeCD=3/16+24/ＲeＲe＜0.01CD=24/Ｒe1+0.1315Ｒe0.82－0.05B0.01≤Ｒe＜20CD=24/Ｒe1+0.1935Ｒe0.630520≤Ｒe≤260lgCD=1.6435－1.1242B+0.1558B2260＜Ｒe≤1500lgCD=－2.4571+2.5558B－0.9295B2+0.1049B31500＜Ｒe≤1.2×104lgCD=－1.9181+0.637B－0.0636B21.2×104＜Ｒe≤4.4×104lgCD=－4.339+1.5809B－0.1546B24.4×104＜Ｒe≤3.38×105CD=29.78－5.3B3.38×105＜Ｒe≤4×105CD=0.1B－0.494×105＜Ｒe≤1×106CD=0.19－8/Ｒe×104Ｒe＞1×106B=lgＲe。3Fig．3Schematicdiagramofparticlecollision3。Vt2=EtVt14Vn2=－EnVn15Et=5/7α'＞35°1.0－μd1+En|Vt1/Vn1|α'＜35{°6En=0.367μd=0.38α'=max1.0β·α9β=－2.202×10－5α3+1.837×10－3α2－6.519×10－2α+1.816+9.522×10－8α－110αradα'radEnEtVt1m·s－1Vn1m·s－1DEFINE_DPM_BC。Define-UserDefined-Functions-CompiledFluent。22.1BMCＲ23dis-creterandomwalkDＲW。2Table2Entranceconditions/m·s－15/m11.15/%2.83/K6503Table3Outletconditions/Pa0/K650/%2.45/m5.39601594Fig．4Distributionofflyashparticleswithdifferentparticlesizesinmodel10～200μm16。Ｒosin-Ｒammler2μm500μm70μm200μm。2.2η=Cin－Cout/Cin11η%Cinkg·s－1Coutkg·s－1。4。4。38.6%157Pa。SCＲ。3000mmα。600mm5。α80°、65°、50°34。5Fig．5Diagramoftransformation4Table4Calculationresultsα/°/Pa/%5060652.36544147.78035839.46Fig．6Distributionofflyashparticleswithdifferentparticlesizesinmodelα。SCＲ。α65°。α65°6。6。7015117Fig．7Diagramoftransformationβ7。α65°β15°、20°、25°、30°5。β。β。β25°8。5Table5Calculationresultsβ/°/Pa/%1540647.72039547.92537748.13034948.48Fig．8Distributionofflyashparticleswithdifferentparticlesizesinmodel3660MWSCＲ。SCＲ。。1．M．20062．SCＲM．20073．SCＲJ．2015446986-9904．SCＲJ．2014295580-5855．SCＲJ．201127510-126．SCＲJ．2011321264-687．SCＲJ．2014439-408．J．2015356489-4959．SCＲJ．20154412119-12510XUYYZHANGYLIUFNetal．CFDanalysisonthecatalystbreakagefailureofanSCＲ-DeNOxsystemfora350MWcoal-firedpowerplantJ．Computers＆ChemicalEngineering2014693119-12711．670MWSCＲJ．201531458-6112．J．2010391273-7513．J．201647232-3814．DPMJ．201548139-4815KUANBＲEANSCHWAＲZMP．ApplicationofCFDinthedesignofagritcollectionsystemforthecoal-firedpowergener-ationindustryJ．PowderTechnology20071791/265-7216．660MWJ．2014423323-3288015