220th循环流化床锅炉气固两相流动特性的研究

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1、AbstractResearchaboutthecharacteristicsofgas-solidtwo-phaseflowincirculatingfluidizedbedcombustor(CFB)isveryimportanttorevealflowbehaviorofgassolidtwo-phase.Becauseofthecomplicacyofgas-solidtwo-phaseflow,itishardtoobtainthedistributionsofparticleconcentrationandvelocitybyexperimentalmethod

2、s.Withtherapiddevelopmentofhardwareandcalculationtechnique,numericalsimulationhasbecomeanimportantmeantostudythegassolidtwo-phaseflowinCFBboile匚TheEuler-Eulertwo-fluidmodelisusedinthesimulationofgas-solidtwo-phaseinCFBboilerincludingcyclones.Thestandardk・£modelisalsousedformodelingofgastur

3、bulence.Thedynamiccharacteristicsofgas-solidtwophaseflowinmodelingCFBboilerisstudied.Resultsshowthattheaxialdistributionofparticleconcentrationisdecreasedastheheightincreasingonthewhole.Effectsoftheinletsofvalvesandoutletsoffurnacearestudied,andfoundthatthedistributionsweredistortedatlocals

4、ection.Furthermore,thetypicalcore・annulusflowisfoundinresultsofthesimulationofmodelingCFBboiler.220t/hCFBboilermadebyHarbinBoilerCompanyLtd.wasalsostudiedasamainobject.Theeffectsofsecondaryair,collocationofsecondaryair,chosenofvalveandtheinitialpackedheightareallanalyzed・Resultsshowthatairs

5、tagingisbetterthanthatfrombottomoftotalairflux.Theopposedsecondaryairisbetterthantangentialsecondaryair.U-typevalveisbetterthanJ-typevalve.Andtheeffectofinitialpackedheightisnotobviousonconditionofthesamebulkofair.Furthermore,comparisonsofaxialvoidageondifferentconditionsarealsomade,andtheS

6、-typedistributionwasobtained.Keywords:220t/hCFBboiler;gas-solidtwo-phaseflow;numericalsimulation;secondaryair;valve目录摘要IAbstractII第1章绪论11」引言11.2循环流化床21・3气固分离装置91.4国内外研究现状及分析111.5本章小节13第2章气固两相流动模型与数值模拟142.1引言142.2研究方法142.3气・

7、占I两相流动模型152.3.1连续性方程和动量守恒方程152.3.2封闭方程组162.3.3k-e湍流模型172.4边界条件及初始条件

8、182.5本章小结19第3章模型化条件下循环流化床内气固两相流动203.1引言203.2模型化条件下循环流化床系统内气体和颗粒流动213.3计算结果及分析233.4本章小结28第4章哈锅220t/hCFB锅炉内气固两相流动分析294」引言294.2二次风对床内气固两相流动的影响304.3二次风布置方式对流动的影响354.4回料阀结构对流动的影响424.5初始堆积床料高度对流动的影响474.6本章小结48结论50参考文献51攻读学位期间发表的学术论文55哈尔滨工业大学硕士学位论文原创性声明56致谢57第1