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1、华东理工大学硕士学位论文第I页气流床流场实验研究与数值模拟摘要新型水煤浆对置式气化炉，是国家“&63”课题之一，采用撞击流概念，强化了炉内的混合和传递过程。本文在大型冷模实验装置上，借助于DualPDA(激光多普勒三维粒子动态分析仪)、Malvern(激光测粒仪)等大型仪器，进行了流体流动的实验研究，进一步揭示炉内复杂的流场、压力场和喷嘴雾化性能对气化炉设计的影响。下面是本文的主要研究内容:I，采用PDA研究了气化炉内流速场结构分布规律，发现炉内存在若干特征区域，并用数学模型来描述复杂的气化炉内特征区域。2采用压差传感器研究气化炉内压力场结构分布规律，并用
2、数学模型来描述特征区域，以了解气化炉内的压力场分布。3.采用Malvern研究了气化炉喷嘴雾化性能，在不断改变操作条件情况下，发现雾化角、滴径分布、雾滴平均直径变化规律，从而为喷嘴尺寸设计提供可靠依据。4.采用k-a湍流模型对气化炉内流场、压力场进行数值模拟，预测和了解了气化炉内混合过程。关键词:水煤浆气化气流床}Vx雾、。值模拟第n页华东理工大学硕士学位论文NumericalSimulationandExperimentalStudyofFlowFieldinJet-entrainedGasifierAbs扮ZCtAnewtypeofjet-entrai
3、nedgasifierusedforcoal-waterslurrygasificationprocessdesignedisonekeytechnology，anddirectlyconcernsallquotasofproductandairpollution.Thiss响ec,isoneofthe863nationstrategicprojects.Theopposed-impingingjetwhichisentrainedhasstrengthenedmixtureandtransmissioncourseinsidethegasifer.Ont
4、helarge-scalecoldmouldpilotplant,thistexthascarriedonexperimentresearchoffluid,andannouncedthecomplicatedflowfield，pressurefieldandtheatorizationcapabilityofspraynozzlewhichwillhavesomebearingonthegasifierdesignfurther,withtheaidofDualPDAandMalvern.Thenextisthemajorresearchcontent
5、ofthistext:1.WiththehelpofPDA,thevelocitydistributionlawofflowfieldstructureinsidegasifierhasbeenstudied,andeverycomplicatedcharacteristicregionhasbeendescribedwiththeMathema-ticalmodel2.Withthehelpofdifferentialpressuresensor,pressuredistributionlawhasbeenstudied,andeverycharacte
6、risticregionhasbeendescribedwiththemathematicalmodel，inordertounderstandpressurefielddistributioninsidethegasifier.3.WiththehelpofMalvern,atomizationcapabilityofspraynozzlehasbeenstudied,byconstantlychangingtheoperatingcondition,todiscoverthecorrelationamongatomizationangle,dropfo
7、otpathdistributionanddropletdiameter,thusthereliablebasiscanbeprovidedforthespraynozzlesize.4.Theflowfieldhasbeensimulatedwiththek一￡turbulentflowmodelcorrelationreasonably,inordertoforecastthemixtureprocessinsidethegasifier.Keyword:Coal-waterslurrygasification,,let-entrainedgasifi
8、er,Opposed-impingingjet,Atomizati
