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1、氣液反應(yīng)體系相界面?zhèn)髻|(zhì)強(qiáng)化研究1111211111張志炳,田洪舟,王丹亮,劉義榕,何健,齊敏,張鋒,羅華勛,丁維平,周政(1.南京大學(xué)化學(xué)化工學(xué)院,江蘇南京210046;2.南京大學(xué)醫(yī)學(xué)院附屬鼓樓醫(yī)院,江蘇南京210008)摘要:氣液反應(yīng)界面?zhèn)髻|(zhì)的強(qiáng)化是當(dāng)今高效和節(jié)能反應(yīng)器研究的重要課題,弄清反應(yīng)器內(nèi)的氣液傳質(zhì)機(jī)理是對(duì)氣液反應(yīng)器進(jìn)行數(shù)學(xué)描述的關(guān)鍵。反應(yīng)過程的能效和物效與體系中的傳質(zhì)系數(shù)kG,kL,kS以及相界面面積a等參數(shù)直接相關(guān),這些參數(shù)受氣泡尺寸、分布、表觀氣速和氣含率等因素的制約。就確定的體系和反應(yīng)條件而言,這些因
2、素會(huì)因反應(yīng)器的結(jié)構(gòu)尤其是攪拌和混合方式的變化而異。文章從理論上分析了影響氣液界面?zhèn)髻|(zhì)的各因素,建立了較為詳細(xì)的理論模型。理論計(jì)算結(jié)果表明:氣泡大小是影響氣液界面?zhèn)髻|(zhì)和最終反應(yīng)速率的重要流體力學(xué)參數(shù),微米級(jí)氣泡對(duì)反應(yīng)過程的強(qiáng)化作用明顯。能量耗散率是決定體系氣泡大小的深層原因,強(qiáng)化氣液反應(yīng)器設(shè)計(jì)時(shí)應(yīng)重點(diǎn)考慮。關(guān)鍵詞:多相反應(yīng)體系;界面?zhèn)髻|(zhì);過程強(qiáng)化中圖分類號(hào):TQ021.4文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):10059954(2016)03000108DOI:10.3969/j.issn.10059954.2016.03.001
3、Intensificationofinterfacialmasstransferingasliquidreactionsystems11112ZHANGZhibing,TIANHongzhou,WANGDanliang,LIUYirong,HEJian,11111QIMin,ZHANGFeng,LUOHuaxun,DINGWeiping,ZHOUZheng(1.SchoolofChemistry&ChemicalEngineering,NanjingUniversity,Nanjing210046,Jian
4、gsuProvince,China;2.GulouHospitalofMedicalSchool,NanjingUniversity,Nanjing210008,JiangsuProvince,China)Abstract:Intensificationofinterfacialmasstransferingasliquidsystemisanimportantissuetoexplorehighefficiencyandenergysavingreactors.Itisthekeytowellunderstandit
5、smechanismofthegasliquidmasstransferformathematicallydescribingofagasliquidreactor.BothenergyandmassefficienciesofthereactionaredirectlyrelatedtothegasliquidinterfacialareaaandmasstransfercoefficientsofkG(gasside),kL(liquidside)andkS(liquidsolid).Theseparam
6、etersareoftenrestrictedbysizeanddistributionoftheflowingbubbles,thegasholdupandthesuperficialgasvelocityetc.,whichcanvarywiththestructuralparametersofthereactor,particularlywiththoseofmixingandstirringmode.Factorsofgasliquidinterfacialmasstransferweretheoretical
7、lyanalyzedandsomemathematicalmodelsweresetup.Thetheoreticalresultsshowthatthebubblesizeinthereactionsystemaffectsthegasliquidinterfacialmasstransferandfinalreactionrateforacertainreactionsystem,andthemicronbubbleshaveobviousintensificationeffect.Energydissipatio
8、nrateofthesystemisthedeepreasonfordeterminingthedimensionofthebubbles,whichshouldbeconsideredduringthedesignofintensifiedgasliquidreactor.Keywords:multiphaser