简介:为了降低ε型六硝基六氮杂异伍兹烷(ε-HNIW)的感度,提出了一种以液态CO2作为反溶剂的新的包覆方法,该包覆方法解决了水悬浮法对溶剂的选择局限性大的问题。对ε-HNIW包覆前后进行SEM、XRD和FT-IR分析,研究表明:选用这种新的包覆方法,氟橡胶、ESTANE和EPDM包覆剂能均匀包覆于ε-HNIW的表面;偶极矩-极性大的包覆剂溶剂使ε-HNIW包覆后转变为α-HNIW晶体;随着包覆剂添加量的增加、或系统压力的降低、或温度的升高,ε-HNIW复合颗粒的分散性越差,球形造型粉颗粒度越好。对ε-HNIW包覆前后进行撞击感度测试表明,相同包覆剂添加量情况下,3种包覆剂降低ε-HNIW感度的大小顺序为:ESTANE〉FE26〉EPDM。
简介:棉花纤维素动态地处于亚andsupercritical状态与乙醇被提取。变换的度是95.4%,当棉花纤维素non-isothermally从20与乙醇被提取时,摘录收益是55.2%吗??
简介:Acombustionmodelofalarge-scalesupercriticalcirculatingfluidizedbed(CFB)boilerwasdevelopedforcomprehensivecomputational-fluid-dynamicsanalysis.Themodelincorporatesgas-solidhydrodynamics,coalcombustion,heattransferonheatexchangesurfacesinthefurnace,andheattransferbetweenfumaceandworkingmediumintheheattransfertubes.Insimulatingthedenseanddilutephasesinthefumace,thegas-solidhydrodynamicsisbasedontheEuler-Eulermodelandenergy-minimizationmultiscaledragmodel.Coalcombustionentailsevaporation,devolatilization,charcombustion,gashomogeneousreaction,andpollutantemission.Thecoefficientofheattransferbetweengas-solidandthewaterwallisestimatedusingtheclusterrenewalmodel,andforradiation,thediscreteordinatemodelisused.Moreover,thermohydraulicprocessesinthemembranewallarealsoineludedintheheattransferprocess.Themodelwassuccessfullyappliedinsimulationsofa350-MWsupercriticalCFBboiler.Detaileddistributionsofsolidsconcentration,oxygen,heatflux,andworkingmediumtemperatureintheboilerfurnacearepresented.
简介:Supercriticalwaterreactor(SCWR)wasproposedasaGenerationⅣconceptforbuildinglargecapacitynuclearpowerplants.ComparingwiththepresentGenerationⅡandⅢlightwaterreactors,SCWRpossessesgreatadvantagesof10%higherefficiency,simplersystemdesign,bettersustainability,andsoon.However,theselectionofmaterialsforfuelcladdingandreactorinternalsofSCWRisfacingagreatchallenge.Corrosioninsupercriticalsteamisofthefirstimportantissuetobesolvedtomeetthestringentrequirementofthereactorinternalcomponents.Corrosionscreeningtestswereconductedoncandidatematerialsfornuclearfuelcladdingandreactorinternalsofsupercriticalwaterreactor(SCWR)instaticandre-circulatingautoclaveatthetemperaturesof550,600and650℃,pressureofabout25MPa,deaeratedorsaturateddissolvedhydrogen(STP).NickelbasealloytypeHastelloyC276,austeniticstainlesssteelstype304NG,AL-6XN,HR3C.NF709andSAVE25,ferritic/martensitic(F/M)steeltypeP92,P122and410,andoxidedispersionstrengthenedsteelMA956,aretested.Thispaperpresentscorrosionrate,andfocusesontheformationandbreakdownofcorrosionoxidefilm,andproposesthefuturetrendforthedevelopmentofSCWRinternalstructurematerials.
简介:Theunit5ofHuangdaoPowerPlantwhichwasfinancedandbuiltbyQingdaoGuoxinIndustrialCo.,Ltd.carriedout168-hourtrialoperationonOctober24.Itsloadfactorreachedover98%.Alltheindexesoftrialoperationwereexcellent.Atpresent,theunitisinoperationundertheconditionsoffullprotection,fullautomationandfullload.
简介:Thestudyonretentionbehaviorinsupercriticalfluidchromatography(SFC)isnecessarytounderstandthemechanismofthevariousinteractionsinSFC.TheretentionofSFCincarboxylicacidmethylester/polymethylsiloxane/CO2systemwasstudiedsystematicallyandtheretentionbehaviorofthiskindofcompoundsundervarioustypicaloperationconditionswasdescribedusingthemethodofanalternativeunifiedtheoryofchromatographicretention.Theresultsillustratedthatexpression:Ink.=a+b/T+cp+dp/T+ep2/Tcanbeusedtodescribequantitativelytheretentionbehaviorofcarboxylicacidmethylester/polymethylsiloxane/CO2systemintherangesofreduceddensityfrom0.549to1.411.Itwasalsofoundthattheentropyofsoluteinstationaryphaseisdependentonthedensityofsupercriticalfluid(SF)undertypicaloperatingconditionsofSFC.
简介:Fortwotrianglestobecongruent,SAStheoremrequirestwosidesandtheincludedangleofthefirsttriangletobecongruenttothecorrespondingtwosidesandincludedangleofthesecondtriangle.Ifthecongruentanglesarenotbetweenthecorrespondingcongruentsides,thensuchtrianglescouldbedifferent.Itturnsoutthatitispossibletodescribefourcasesinwhichtrianglesarecongruenteventhoughcongruentangles.Fortwotrianglestobecongruent,SAStheoremrequirestwosidesandtheincludedangleofthefirsttriangletobecongruenttothecorrespondingtwosidesandincludedangleofthesecondtriangle.Ifthecongruentanglesarenotbetweenthecorrespondingcongruentsides,thensuchtrianglescouldbedifferent.Itturnsoutthatitispossibletodescribefourcasesinwhichtrianglesarecongruenteventhoughcongruentanglesarenotbetweenthecorrespondingcongruentsides.Suchatheoremcouldbenamed,forexample,SSAtheorem.ManytextsstatethattwotrianglescannotbeshowntobecongruentiftheconditionofSSAexists.However,theauthordescribescasesinwhichsuchtrianglescouldbeprovencongruentwiththeSSAtheorem.Animmediateconsequenceofthisnewunderstandingisthenecessityofrevisingmanyproblemsandanswersinhighschoolandcollege-leveltextsrelatedtocongruenttriangles.arenotbetweenthecorrespondingcongruentsides.Suchatheoremcouldbenamed,forexample,SSAtheorem.Animmediateconsequenceofthisnewunderstandingisthenecessityofrevisingmanyproblemsandanswersinhighschoolandcollege-leveltextsrelatedtocongruenttriangles.