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1、毕业设计（外文翻译）题目：标准筛振筛机的总体及夹紧装置的设计系别航空工程系专业名称机械设计制造及其自动化班级学号078105332学生姓名徐立轩指导教师罗海泉二O一一年三月COALPREPARATIONTABLE7-14.EffectofGeometryandConcentrationofFeedSolidsonthroughputfora1/6-in,diamhydrocyclonecleaning1/4-inVaryingthedistancebetweenthebottomofthevortexfinderandthehydrocyclone
2、conebottom.Forexample,thewashedcoalashcanbereducedbydecreasingthediameterofthevortexfinder,decreasingthelengthofthevortexfinder,orincreasingthediameteroftheunderfloworifice.Increasingfeed-Solidscontentincreasesthespecificgravityofseparationand,therefore,washedcoalyieldandash,w
3、hichindicatestheimportanceofmaintainingaconstantfeed-solidscontenttopreservewashedcoalquality.Capacityisinfluencedbycyclonegeometry,i.e.,thesizesoftheoverflow,underflow,andinletopenings,andbyfeed-solidscontent.TheeffectsoftheseparametersisgiveninTable7-14.Increasinginletpressu
4、reisasimplemethodofincreasingcapacitywithoutchanginghydrocyclonegeometry,andwashedyieldandasharenotsignificantlyaffected.However,thepenaltyisincreasedpumpingcost,anddegradationofthecoal.FlowsheetsSoonafterthehydrocyclonewasdeveloped,itbecameevidentthatperformancewasinferiorton
5、earlyallothercleaningdevices.Consequently,inanefforttoimproveperformance,threetwostagecircuits,showninFig.7~64,weredeveloped.Intheearliesttwo-stagecircuit,calledtwo-stagerelearnorTSR,therefusefromaprimaryhydrocycloneissimplyrelearnedinasecondaryhydrocyclone,Theoverflowsfromthe
6、twohydrocyclonesarerecombinedasthewashedcoalproduct,andtheunderflowsfromthesecondaryhydroclonecontainsthefinalrefuse.Inmorerecentinstallations,oneoftheproductsfromthesecondaryhydrocycloneisrecirculatedtothefeedoftheprimaryhydrocyclone.Inthetwo-stageoverflowrecirculationcircuit
7、,TSOR,theprimaryorfirst-stagehydrocycloneisadjustedtoproduceanacceptablecleancoalandthesecondaryhydrocycloneisadjustedtoproducearefuseessentiallyfreeofmisplacedcoal.Theoverflowfromthesecondaryhydrocyclone,whichcontainsthemisplacedcoalintheunderflowsoftheprimaryhydrocyclone,isr
8、eturnedtothefeedoftheprimaryhydrocycloneforreprocessing.Inthe
