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1、華東理工大學碩士學位論文第I頁氣流床流場實驗研究與數值模擬摘要新型水煤漿對置式氣化爐，是國家“&63”課題之一，采用撞擊流概念，強化了爐內的混合和傳遞過程。本文在大型冷模實驗裝置上，借助于DualPDA(激光多普勒三維粒子動態(tài)分析儀)、Malvern(激光測粒儀)等大型儀器，進行了流體流動的實驗研究，進一步揭示爐內復雜的流場、壓力場和噴嘴霧化性能對氣化爐設計的影響。下面是本文的主要研究內容:I，采用PDA研究了氣化爐內流速場結構分布規(guī)律，發(fā)現(xiàn)爐內存在若干特征區(qū)域，并用數學模型來描述復雜的氣化爐內特征區(qū)域。2采用壓差傳感器研究氣化爐內壓力場結構分布規(guī)律，并用
2、數學模型來描述特征區(qū)域，以了解氣化爐內的壓力場分布。3.采用Malvern研究了氣化爐噴嘴霧化性能，在不斷改變操作條件情況下，發(fā)現(xiàn)霧化角、滴徑分布、霧滴平均直徑變化規(guī)律，從而為噴嘴尺寸設計提供可靠依據。4.采用k-a湍流模型對氣化爐內流場、壓力場進行數值模擬，預測和了解了氣化爐內混合過程。關鍵詞:水煤漿氣化氣流床}Vx霧、。值模擬第n頁華東理工大學碩士學位論文NumericalSimulationandExperimentalStudyofFlowFieldinJet-entrainedGasifierAbs扮ZCtAnewtypeofjet-entrai
3、nedgasifierusedforcoal-waterslurrygasificationprocessdesignedisonekeytechnology，anddirectlyconcernsallquotasofproductandairpollution.Thiss響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
