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1、SimulationonSootEmissionControlinStoker-FiredBoilerbySecondaryAirQingchengWangInstituteofThermalandPowerEngineering,ShanghaiInstituteofTechnology,Shanghai200235,ChinaReceived:March21,2011/Accepted:May16,2011/Published:January20,2012.Abstract:Aworkonsootemissioncontrolsimulation
2、instoker-firedboilerbysecondaryairhasbeendone.Somemodelssuchask-ε,combustion,radiation,andsootKhan-Greeveshavebeenadopted.Sootproductionandemissionhasbeenreducedbysecondaryair;thehighestmassconcentrationisreducedfrom7.46×10-14to6.94×10-15;massconcentrationofsootisdecreasedfrom1
3、.12×10-15to9.25×10-32intheupperareas.Keywords:Soot,stoker-firedboiler,secondaryair,simulation.1.Introduction6Thesootparticlesderivedfromcoalcombustionaffecttheenvironmentalqualityandpeople’shealth,whicharepaidattentiontobymoreandmorepeople.Sootparticlesinairrelatetopeople’sacut
4、eandchronicdiseases[1,2].Uptonow,manyworksfocusonthesootformationderivedformsimplygashydrocarbons,liquidfuelsandpulverizedcoals[3].Fewworkshasbeenmentionedforsootformationderivedfromlump-coalcombustioninstoker-firedboiler.Therearemorethan0.5millionsindustrialboilersandthetotali
5、nstalledcapacityoftheindustrialboilersismorethan1.2millionstonsperhour;morethan400milliontonsofcoalsareconsumedinChina;andthestoker-firedboileristhedominatingcombustionstyle[4].Thecharactersofthisboilerstylearelowinefficiencyandhighinpollutantsemission.Itissignificanttosimulate
6、sootgenerationinordertoreducethesootemissionandincreasetheefficiencyofstoker-firedboiler.2.SimulationMethodComputationModel6Computationmodelisconstitutedwithseveralsub-modelsasbelow:(1)k-εModelIntheseequations:A-constantintheMagnussenmodel;YOX,Yfuel-massfractionsofoxidizerandfu
7、el;-massstoichiometriesforsootandfuelcombustion.3.ComputationMethodTheheightandwidthofcomputationareaare1,000mmand200mmrespectively,whicharedividedinto108,365meshes.ThecomputationmethodisSemi-ImplicitMethodforPressureLinkedEquationConsistent(SIMPLE).Inletboundaryconditionsoffue
8、lrefertotestingresultofvolatilesinstoker-firedboiler.M
