简介：这个工作介绍调查结果的评论进包装算法的一个数字地基于的粒子的能力，叫的DigiPac，在许多包装的列预言床结构，为通用小团的一个范围，形状经常在设计工业的化学药品和过程使用了。产生宏观的性质与从侵略、非破坏性的测量技术导出的试验性的数据相比。另外，通过产生的床结构的样品，液体速度分布用格子Boltzmann被分析方法(LBM)模拟并且从文学对试验性的数据被比较。

简介：在严肃下面的自发的粒子过滤的现象借助于分离元素方法被调查。象过滤速度，住处时间分发和光线的分散那样的过滤行为在各种各样的条件下面被检验。经过一包更大的粒子移动的一个滤粒子的垂直速度与增加在粒子和滤到包装粒子的直径比率之间的归还系数减少，这被显示出。随归还系数的增加，住处时间和滤粒子的光线的分散增加。收拾行李的高度影响住处时间和光线的分散。但是，效果能在他们分别地到平均住处时间和收拾行李的高度和收拾行李的粒子直径的产品被使正常化的住处时间和光线的分散的分析被消除。另外，当额外的经常的垂直力量被使用时，过滤速度被显示与滤粒子的垂直加速有关。增加滤的喂的率粒子减少分散系数。

简介：PrecipitationofBaSO4nanoparticleswasstudiedforthefirsttimeinaspeciallydesignedrotatingpackedbed(RPB),whichallowedsamplingatdifferentradialpositionstoprovidebetterinsightofthemechanismofprecipitationinRPB.ParticlesizeandmorphologywerecharacterizedbyTEM,whilethequalityofsynthesizedBaSO4powderswasanalyzedbyXRDandBET,andcomparedwiththosepreparedinastirred-tankreactor.TheimportantroleoftheinletregionoftheRPBinthewholeprecipitationprocesswasexperimentallyconfirmed,asasignificantessenceforthedesignofindustrialRPBfortheprecipitationofsparinglysolublematerials.Theeffectsofdifferentoperatingconditionsonparticlesizewerealsoinvestigated,showingthatparticlesizedecreaseswithincreasingrotationalspeedandliquidflowrate,duetotheenhancementofmicromixingintheRPB.

简介：Athree-dimensionalgeometricmodeloftheoxidativecouplingofmethane(OCM)packed-bedreactorloadedwithNa2WO4-Mn/SiO2particulatecatalystwassetup,andanimprovedStanschkineticmodelwasestablishedtocalculatetheOCMreactionsusingthecomputationalfluiddynamicsmethodandFluentsoftware.Thesimulationconditionswerecompletelythesamewiththeexperimentalconditionsthatthevolumevelocityofthereactantwas80mL/minunderstandardstate,theratioofCH4/O2was3,thetemperatureandpressurewere800°Cand1atm,respectively.Thecontourofthecharacteristicsparametersinthecatalystbedwasanalyzed,suchasthespeciesmassfractions,temperature,theheatfluxonsidewallsurface,pressure,fluiddensityandvelocity.TheresultsshowedthatthecalculatedvaluesmatchedwellwiththeexperimentalvaluesontheconversionofCH4andtheselectivitytoproducts(C2H6,C2H4,CO2,CO)inthereactoroutletwithanerrorrangeof±2%.ThemassfractionsofCH4andO2decreasedfrom0.6and0.4inthecatalystbedinletto0.436and0.142intheoutlet,wherethemassfractionsofC2H6,C2H4,COandCO2were0.035,0.061,0.032and0.106,respectively.Duetotheexistenceoflaminarboundarylayer,thecontoursofeachcomponentbentupwardsinthevicinityoftheboundarylayer.ThisOCMreactionwasvolumeincreasereactionandthetotalmolesofproductsweregreaterthanthoseofreactants.Theflowfieldinthecatalystbedmaintainedconstanttemperatureandpressure.Thefluiddensitydecreasedgraduallyfrom2.28kg/m3intheinletofthecatalystbedto2.22kg/m3intheoutletofthecatalystbed,whilethevelocityincreasedfrom0.108m/sto0.115m/s.

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简介：Thechargingpatternmayaffectblastfurnacepermeability,cokeratio,andthefreedomtoselectlow-graderawmaterials.Ore-cokemixedchargingisapotentialtechniqueforoptimizingthechargingpattern.Inrecentyears,chargingsmall-sizedcoke(nutcoke)intotheburdenlayerhasbeenappliedtosaverawmaterialsanddecreasecost.Althoughmixedcharging,especiallyaddingnutcokeintotheburdenlayer,mayhavemanyadvantages,themechanismsandsideeffectsofnutcokeusearenotwellunderstood,andthemixingratioisstilllimitedinindustrialblastfurnaceoperation.Inthisstudy,thestatusofmixedcharging,especiallynutcokeusedinblastfurnaces,wasinvestigated.Acoldflowmodelwasestablishedtostudythepermeabilityofthepackedbedintheblastfurnace"dryzone"underdifferentconditionswiththeaimofbetterunderstandingthemechanismsofmixingcokeandnutcokeintotheburdenlayer.Theeffectofcokesize,mixingcokeratio,layernumbers,andgasflowrateonthepressuredropofthepackedbedwasinvestigated.Theexperimentalresultsshowthatmixingthenutcokeintheorelayersdecreasesthepressuredroptodifferentextentsdependingonmixingratio.

简介：Thestabilityofbuildingsonthesurfacewillbeinfluencedbyundergroundmining.Forthepurposesofsafeminingandbuildingsprotectingaroundminingarea,therockandsoildistortionshouldbeforecasted.Byusingtheresultsoftheelastic-finite-elementmethodsimulation,wecancalculatethetilting,horizontaldeformationandcurvatureofthesurfaceandthestrata.WushanCopperMinewastakenasanexampletoanalyzethereasonsofaccidentandbeyondstandardlimit,andtheinfluenceonthesafetyofthepackedvolumn.

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