基于fluent软件的旋风除尘器优化设计

I摘要旋风除尘器是一种重要的气-固分离设备，因为其结构简单、设备紧凑、制造容易、成本相对较低等优点，被广泛应用于矿山、化工、能源、环保、冶金、建材等众多工业领域。然而往往因其结构设计不正确，尺寸匹配不合理等因素限制了除尘效率的提高，并且能耗很大。当前，随着经济增长及国家对环境保护日益重视，工业生产中，迫切需要一种高效率低能耗的新型旋风除尘器。为此，本文针对旋风除尘器传统设计方法不够完善，通用性差及其内部三维流场规律认识不全面等问题，采用优化设计和数值模拟相结合的研究方法，考察分析了不同情况下的颗粒运动轨迹及不同入口颗粒浓度、不同排气管插入深度、不同进气口形状、不同直管长度等操作与结构参数对分离性能的影响；采用Fluent软件进行数值模拟，基于上述的数值模拟结果，有效地预测了优化型旋风除尘器结构尺寸匹配的合理性及提出的优化设计方法的可行性，从而为今后旋风除尘器的研制提供了一种通用的设计方法。因此本文的研究无论是在工程应用，还是在理论研究方面上都具有十分重要的价值。关键词：旋风除尘器；优化设计；数值模拟；FluentIIABSTRACTCycloneseparatorisanimportantgas-solidseparationequipment,whichhasmanyadvantages,suchassimplestructure,compactequipment,easytomanufacture,relativelylow-costandsoon.Soithasbeenwidelyappliedinthemining,chemicalindustry,energysource,environmentalprotection,metallurgy,buildingmaterialsandtheotherindustrialfields.However,becauseofunreasonablestructuredesignandsizematchingfactors,whichrestricttheefficiencyimproving,besidesitwastesmoreenergyconsumption.Atpresent,withtherapidgrowthoftheeconomyandpayingmoreattentiontoenvironmentalprotection,peopleurgentlyneedtoresearchanewtypecycloneseparatorthathasmuchhigherseparationefficiencyandlowerconsumption.Therefore,inviewoftheunperfectseparationmodelandtheweakprevalenceofthetraditionaldesignmethod.Inaddition,peoplecan’tunderstandaccuratelytheseparationtheoriesofcycloneseparator.Usingnumericalsimulationandoptimaldesigncombinationofresearchmethods,Forexample,differentinletparticleconcentration,differentinsertdepthandinletshape,diffIerentverticaltubelengthofcycloneseparator.Goingonthe3DflowfieldnumericalsimulationwithFluent,basedontheresultsof3Dflowfieldnumericalsimulation,provetherationalityofthesizematchandthefeasibilityofthedesignoptimizationandproposeauniversaldesignmethodforthefutureprovisionofcycloneseparator.Therefore,ithassignificantapplicationvalueintheengineeringapplicationandtheoreticalresearch.Keywords:Cycloneseparator;Optimizationdesign;Numericalsimulation;FluentIII目录第一章绪论......................................................................................................................................11.1论文研究的目的........................................................................................................................11.2论文研究方法及内容................................................................................................................1第二章旋风除尘器的分离理论与性能分析.................................................................................32.1旋风除尘器的工作过程............................................................................................................32.2旋风除尘器内部的旋流............................................................................................................42.3旋风除尘器的分离理论............................................................................................................52.4旋风除尘器的性能评价指标....................................................................................................82.5影响除尘器的性能的因素......................................................................................................10第三章CFD原理..........................................................................................................................153.1CFD简介..................................................................................................................................153.2常用CFD软件.......................................................................................................................153.3CFD理论基础..........................................................................................................................163.4常用离散化方法......................................................................................................................173.5CFD中的三维湍流模型..........................................................................................................183.6CFD求解过程..........................................................................................................................18第四章STAIRMAND型旋风除尘器的流场模拟......................................................................204.1STAIRMAND型旋风除尘器结构尺寸的确定..........................................................................204.2FLUENT流畅模拟..................................................................................................................21第五章OC型旋风除尘器的结构设计及流场模拟....................................................................275.1改进思想..................................................................................................................................275.2改进措施..................................................................................................................................275.3OC型旋风除尘器的除尘机理................................................................................................305.4OC型结构设计........................................................................................................................315.5OC型旋风除尘器流场模拟....................................................................................................34第六章结论与展望.........