已阅读5页,还剩12页未读, 继续免费阅读
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
英文原文Newenergy-savingmechanicalmixerandOverviewofadaptablediedesignforextrusionAbstractIntheworktherearedescribedtheresultsfromthelaboratoryresearchesofthebasiccharacteristics(performance)ofonenewtypeofenergy-savingmechanicalmixer,conditionallynamedEleron.Thesecharacteristics(performance)arecomparedwithrespectiveresultsoftheotherknownintheliteratureandsuccessfullyusedinpracticemixers.Themixerisdesignedformixingandaeratingliquidsystemsanditwillbeeffectiveformixinginthefermentreactorsforbiochemicalindustries,wheretheprocessesareenergyabsorbing.Keywords:Mixer;Air-saturation;Power-number;Heatandmass-transferduringmixing;Aeration-number1.IntroductionInimplementingalong-term,energy-savingprogramforindustry1,thedepartmentofHeatandMass-TransferTechnicsinTU-Sofia,undertheguidanceoftheauthor,hasconditionallycreatedforpatentanoriginalconstructionofenergy-savingmixer.Ithasauniversalfunctionformixingliquidsystemsinchemical,food,wine,tobacco,andbiochemicalindustries.Weexpectourmixertotakeitsplacewithdignityinfermentationtechnics,becauseofitseasymanufacture,goodresultsinair-saturationandlowenergyconsumption.TillnowitwastheinvestigatedlaboratoryversionofEleron-1mixer,whichisasmalltype,withD=(0.25/0.35)T.UniversalappearanceofmixerisshowninFig.1.Itconsistsofacentralrounddisk(1),whichiscarryingpap(2)andfourwings(3).Thewingsarecutthroughinthemiddle(aa)andinthebeginning,neartherounddisk(cc),andthereceivingpiecesarebendarch-shapedupanddownward,makingfourbladeswithradiusR=(0.05/0.07)D.TheirlengthisL=0.8pR,as(considered)fromlineofbend.Thebladesoneachfollowingwingareindifferentorderinbenddirection,andbecauseofthisinworkingconditionstherearecircumstancesforvortexes.Thisisveryimportantwhenthereismorethanonemixeronashaft(Figs.1and2).Whenmounting,weobservetheaxialflows,createdbycurvedblades,tomeeteachother(ifweaimairsaturation)ortopasseachother,whenweaimmixingwithoutaeration.Inthiswaywecreatemultitudeofsymmetricalcurrentlines(vortexes),whichspreadsymmetricallyvessel.2.ExperimentalForresearchingcharacteristics(performances)ofmixerEleron-1thereareusedtwoidenticallaboratoryreactorswithplanebottomandreleasers,respectivelywithvolumes6.5and24dm3.Reactorsdiametersare,respectively190and300mm,andmixersaremakeupwithD_0.35T.Aspatternsubstancesthereareusedwateranddiethyleneglycol,whichunder20ChavedynamicalviscosityandPas.ReactorsconfigurationisonFig.2andtheexperimenttalinstallation,whichisused,isonFig.3.Withthisinstallationsconfigurationweareresearchingthepowerconsumption,workingwithandwithoutaeration,heat-transferduringmixingwithEleron-1,thatiswhyreactorshaveheat-transferbogies-worm-pipes(serpentines)withrespectivetubediameterd1andwindupdiameterdS,whichareonFig.2.FormeasuringDO2(dissolvedoxygen)inliquidphaseduringaeration,installationalsohasabottlewithnitrogen,air-compressor,sensorforDO2andawritinginstrument,whichregisteronthetapetheoxygenabsorption(Fig.3).Fig.1.SchemeofmechanicalmixerEleron-1inappearancefromabove.2.1.PowercoefficientdeterminationForthismixerscharacteristicareusedtworeactorsandtwopatternsubstances,andtherotationfrequencyofmixersshaftischangingfrom100to1200min_1.Rotationfrequencyischosenandfixedandafterthatiscontrolledwithelectroniccyclometer.Eu-numberisdeterminedunderequationanditisreadnetpowerconsumptionP,forrespectiverotationfrequency.ThedependencyisinFig.4andiscomparedwiththedependencyofRushton-turbine.2.2.Aeration-numberdeterminationThisexponentisdefinedunderknownmethods,whichisadoptedformixingtechnics.Inourreactorwithvolume6.5dm3,withthehelpofair-distributedmechanism,theairisentrancedwithflowofqG_0.1to1.5V.TheresearchingresultsareonFig.5andarecomparedandheat-transfersurface(serpentine).Fig.2.ConfigurationoflaboratoryreactorswithmechanicalmixerFig.3.Schemeofexperimentalinstallations:1,thermostat;2,reactor;3,pressurevessel;4,heat-transfersurface(serpentine)2.3.Mass-transfercoefficientdeterminationduringmixingwithEleron-1Thereareusedtworeactorswithdifferentvolumes,whichhaveair-distributedmechanismsandsensorformeasuringandregisteringofCO2inwater.Weworkunder20C,andtheliquidphase,beforeeachattempt,isscavengedwithnitrogenuntilinitialoxygenconcentrationC0,whichischangingprogressivelyandiswritingonthetapetillestablishinganequilibrium(saturationconcentration).3TraditionalMixer3.1Differentwaystoclassifythemixers.3.1.1Accordingtothenumberofmixingspindles.Therearesingle-spindlemixersanddouble-spindleoreventriple-spindlemixers.3.1.2Accordingtotheirmixingspeed.Thereareslow-speedmixers(lessthan30rev/min),highspeedmixers(above35rev/min),andvariablespeedmixers.3.1.3Accordingtotheiroperationmode.Theycanbeclassifiedintobatchmixersandcontinuousmixers.3.1.4Accordingtotheaxispositionofthemixingspindlefromwhichthemixingarmsreceivetorqueandmotion.Theycanbeclassifiedintoverticalmixersandhorizontalmixers.Inthischapter,hemachineswillbediscussedintermsofthisclassification.Investigationsshowthathorizontalmixersarestillthedominantmixingequipmentintodaysmodernbakeryandsnackindustry,fortheyareofsimpleconstruction,simpleinoperation,andcheapertorun.TheyalsohavevariedcapacitiesandcanbeusedforawidevarietyofmixturesfromathinbatterforcookiedepositingtoextremelytoughdoughforChinesesnackcasing.3.2HORIZONTALMIXERSHorizontalmixersarecharacterizedbyhavingahorizontallylocatedmixingspindleonwhichthemixingarmsarefixedintothemixingbowl.Fig.2.1isatypicalfrontviewofthiskindofmixer.3.2.1ConstructionAtypicalhorizontalmixerconsistsofamixingbowl,oneortwomixingspindlesbywhichthemixingarm(s)isoraredriventhroughtransmissionmechanisms,andamainframemadeofeithercastironorunitaryconstructionofheavysteelplate,Oneortwomotorsaremountedbelowformixingandbowltiltingfunctionstogetherwithafaciacontrolandanelectricinterlocksystemtopreventaccesswhenthemachineisrunning.Therearetwotypesofweighingsystems:oneisseparatefromthemixer;theothercalculatestheweightchangeofthecompletemixerbeforeandaftertheadditionofaningredient,themixerbeinglocatedonasuitableweighingscaleorplatform.Inthiscasethemixerisoftenreferredtoasaw
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 文明创建问题整改方案完整版(10篇)
- 【可行性报告】2023年直播行业项目可行性分析报告
- 安全经验分享用电安全知识
- 影响免疫组化染色的因素及对策
- 课堂教学教案
- 咽扁桃体恶性肿瘤的护理查房
- 阑尾肿瘤的护理查房
- 级专业技术资格人员情况简介
- 细胞怎样构成生物体复习
- 前厅服务与管理(贵州交通职业技术学院)智慧树知到期末考试答案2024年
- 九年级心理健康教育教案 全册
- 2022版义务教育(道德与法治)课程标准(含2022年新增和修订部分)
- 夹层杯液基抗酸杆菌检测法课件
- 手术报告审批单
- 绿色简约乡村振兴特色产业发展计划PPT模板
- 《最后一次讲演》-完整版课件
- GA 814-2009 警用约束带标准
- 教师透题检讨书
- 直辖市城投集团固定资产管理制度
- 四川省德阳市各县区乡镇行政村村庄村名居民村民委员会明细及行政区划代码
- 体育心理学(第三版)课件第三章运动兴趣和动机
评论
0/150
提交评论