雙元模型碳氫混合物的超臨界催化裂解和積炭研究.pdf

1、天津大學碩士學位論文雙元模型碳氫混合物的超臨界催化裂解和積炭研究姓名：羨小超申請學位級別：碩士專業(yè)：化學工藝指導教師：張香文20070101ABSTRACTThemanagementhighheatfluxesgeneratedbyhypersonicflightareoneoftheprincipalissuesforthedevelopmentofhypersonicpropellanttechnologyThecoolingtec

2、hnologyusingthephysicalandchemicalheatsinkoffuelprovidesthebestmeansformeatingthecoolingrequirementAscanoffersufficientcollingcapacityandfacilityinstorage，theendothermichydrocarbonfuelshavebeenwidelystudiedTheendothermic

3、reactionsofendothermichydrocarbonfuelsincludethermalcracking，catalyticdehydrogenationandcatalyticcracking，duringwhichthecatalyticcrackingisthemostpotentialprocessInthepresentworkn—dodecane／isooctaneandn—dodecane／decalinb

4、inarymixtureswerechosedasmodelfuelsrepresentingnormalalkane／branchedalkaneandnormalalkane／naphthenebinarymixturestobeengagedinsupercriticalcatalyticcrackingresearchesDuringthestudyofndodecane／isooctanebinarymixturesuperc

5、riticalcatalyticcracking，theinfluencesofdifferentcatalyst，crackingtemperature，pressure，compositionofthebinarymixture，feedrateandcatalystamountonconversion，gasproduct，liquidproductandcokedepositwereinvestigatedThefollowin

6、gconclusionswenreachedaccordingtotheexperimentalresultsComparedwithHZSM一5／1IBandHZSM5／HYmixturecatalysts，catalyticcrackingoverHZSM一5resultsinhightotalconversion，gasyieldandlowcokedeposit，showingagoodperformanceAsthecrack

7、ingtemperatureincreases，bothconversionandgasyieldincrease，cokedepositdecreasesfollowedbyaincreasingstageandthelowestvalueisobtainedat450“CWithincreasingcrackingpressure，bothtotalconversionandgasyielddecrease，andcokedepos

8、itincreasesAsthecontentofisooctaneis15％or85％twocomponentsofthebinarymixturehavethemostintenseinteraction，andalittle(5％)isoocmnecallin_hencebothndodecaneconversionandgasyieldTheinvestigationoffeedrateshowsthat，fromlml／min

9、to4ml／minthereisnosignificantdifferencesinconversion，howevergasyieldsharplydecereasesandshowsintensivedependentonresidenctimeTheresearchofcatalystamountgivestheconclusionthat，thefirst3／10catalystbednearlyprovidesthetotal