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《探究介質(zhì)阻擋放電等離子體轉(zhuǎn)化甲烷過(guò)程的動(dòng)力學(xué)模擬》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、天津大學(xué)碩士學(xué)位論文介質(zhì)阻擋放電等離子體轉(zhuǎn)化甲烷過(guò)程的動(dòng)力學(xué)模擬姓名:齊向娟申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):化學(xué)工程指導(dǎo)教師:李士雨2002.1.7天津大學(xué)碩j.學(xué)位論文摘要摘要本文通過(guò)實(shí)驗(yàn)研究了常壓下利用介質(zhì)阻擋放電冷等離子體技術(shù)轉(zhuǎn)化甲烷的過(guò)程規(guī)律,考察了介質(zhì)阻擋放電的特點(diǎn)及工藝參數(shù)對(duì)反應(yīng)的影響。通過(guò)機(jī)理分析,本文探討了上述反應(yīng)過(guò)程的動(dòng)力學(xué)特點(diǎn):選取17種粒子所涉及的43個(gè)基元反應(yīng),建立了介質(zhì)阻擋放電等離子體轉(zhuǎn)化甲烷的反應(yīng)網(wǎng)絡(luò),推導(dǎo)出電子一分子(自由基)反應(yīng)速率常數(shù)的計(jì)算公式,根據(jù)反應(yīng)條件估算了介質(zhì)阻擋放電CH。等離子體中的平均電子能量,得到輸入功
2、率同放電中電子密度的天系。利用所建模型對(duì)甲烷轉(zhuǎn)化產(chǎn)物隨停留時(shí)間、輸入功率及反應(yīng)溫度的變化情況進(jìn)行了計(jì)算機(jī)模擬,模擬計(jì)算結(jié)果可以較好地吻合實(shí)驗(yàn)數(shù)據(jù),說(shuō)明所建模型————————_,_一是可靠的。r—~、I通過(guò)實(shí)驗(yàn)與計(jì)算機(jī)模擬,本文還得到如F結(jié)論:\l實(shí)驗(yàn)條件下介質(zhì)阻擋放電等離子體甲烷轉(zhuǎn)化C:烴的量依次為:C:H。)C2H2)C2H4;2實(shí)驗(yàn)條件下介質(zhì)阻擋放電CH。等離子體中的平均電子能量值范圍為8.2~8.8eV:3實(shí)驗(yàn)條件下放電間隙中電子濃度數(shù)量級(jí)為1010cm一:4高能電子同甲烷分子的碰撞解離反應(yīng)是引發(fā)整個(gè)反應(yīng)體系的關(guān)鍵。、:}//關(guān)鍵詞:
3、介質(zhì)阻擋放電,等離子體,甲烷,夥蘇擎,雀藏滅津大學(xué)碩士學(xué)位論文摘要AbstractInthispapeLtheconversionofmethaneusingdielectric—barrierdischargeofcoldplasmareactionatatnlosph謝cpressure、、+ascarriedout;theprincipalsofdielectric。barrierdischargeandtheeffectofthedischargeparametersonthemethaneconversionwerediscover
4、ed.Byanalyzingofthereactionmechanism,wediscussedthedynamicrulesoftheconversionreaction:selected43radicalreactionwhich17particleconcemedandbuiltthereactionnerorkofmethanecon、rersion;deducedthecalculationofreactionrateconstantofelectron—molecule(orradicals)reaction;estimatedt
5、heaverageelectronenergyindielectric—barrierdischargemethaneplasma;gainedtherelationbetweentheinputpowerandelectrondensity.Onthebaseofthemodelwehadbuilt,therelationshipsbetweenconsistenciesofproductsinmethaneconversionandretentiontime,inputpowerandtemperatureweresimulated;th
6、esimulationresulthadagoodcoherencewiththeexperimentdata,whichvalidatedthevalidityofthemodelwehadbuilt.Duetoourexperimentandsimulation,wealsogottheconclusionasfollows:1Undertheconditionofdielectric—barrierdischargeplasma,theorderofC2hydrocarbonproductconsistenciesisC3H^)C2H2
7、)C2H4;2Theaverageelectronenergyindielectric—barrierdischargemethaneplasmais8,2-8.8eV;3Thequantityoftheelectrondensit3,inthegapis1010cm-3;4Thedissociationreactionsbetweenhi曲·energyelectronsandmethanemoleculesorradicalsplayake5roleinthewholereaction.Keywords:dielectric—barrie
8、rdischarge,plasma,methane,kinetics,simulation3天律人學(xué)碩J.學(xué)位論文緒論隨著人類工業(yè)文明的發(fā)展,化石燃料被大量使用,以