第37卷第3期高校化学工程学报No.3Vol.372023年6月JournalofChemicalEngineeringofChineseUniversitiesJune2023文章编号：1003-9015(2023)03-0383-09多喷嘴喷动流化床内气固两相流动与传热过程CFD-DEM模拟刘雪峰1,白谨豪1,吴峰1,马晓迅1,2,危仁波1(1.西北大学化工学院陕北能源先进化工利用技术教育部工程研究中心,陕西西安710069;2.陕西省洁净煤转化工程技术中心,陕西西安710069)摘要：为研究喷动床内颗粒的流体力学与传热特性，采用计算流体力学-离散单元(CFD-DEM)耦合方法对多喷嘴喷动流化床(IMJSFB)内的颗粒进行数值模拟，将模拟结果与常规喷动床(CSB)对比。结果表明：IMJSFB内颗粒混合与流动特性明显优于CSB，表明侧开孔的存在改善了颗粒流动死区现象。IMJSFB内的颗粒总势能和颗粒总平移动能均低于CSB，侧开孔对主喷嘴气体实现了分流，削弱了喷射区的颗粒运动。当颗粒的传热系数低、热容小、进气温度较低时IMJSFB的优势更显著。关键词：多喷嘴喷动流化床；计算流体力学；颗粒混合特性；流动特性中图分类号：TQ021.3文献标志码：ADOI：10.3969/j.issn.1003-9015.2023.03.006CFD-DEMsimulationofgas-solidtwo-phaseflowandheattransferinmulti-jetspout-fluidizedbedLIUXuefeng1,BAIJinhao1,WUFeng1,MAXiaoxun1,2,WEIRenbo1(1.NorthernShaanxiEnergyAdvancedTechnologywithChemicalEngineeringResearchCenteroftheMinistryofEducation,SchoolofChemicalEngineering,NorthwestUniversity,Xi'an710069,China;2.ShaanxiResearchCenterofEngineeringTechnologyforCleanCoalConversion,Xi'an710069,China)Abstract:Thecharacteristicsofparticleflowandheattransferinmulti-jetspout-fluidizedbed(IMJSFB)werestudiedbythecomputationalfluiddynamics-discreteelementmethod(CFD-DEM),andthesimulationresultswerecomparedwithconventionalspoutedbed(CSB).TheresultsshowedthatthemixingandflowcharacteristicsofparticlesinIMJSFBwerebetterthanthoseinCSB,indicatingthatthepresenceofsideholesimprovestheparticleflowindeadzone.ThetotalpotentialenergyandtotaltranslationalkineticenergyofparticlesintheIMJSFBarelowerthanthoseinCSB,andtheexistenceofsideholesdivertsthegasfromthemainjetandweakensthemovementofparticlesinspoutregion.TheadvantagesofIMJSFBareobviouswhentheheattransfercoefficientofparticlesislow,thematerialheatca...
