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厚度方面有关论文范文检索,与石油化工文题目今日相关发表论文
本论文是一篇厚度方面有关发表论文,关于石油化工文题目今日相关硕士学位毕业论文范文。免费优秀的关于厚度及结构设计及换热器方面论文范文资料,适合厚度论文写作的大学硕士及本科毕业论文开题报告范文和学术职称论文参考文献下载。
126;200)underturbulent,sotheheattransfercoefficientishigh,generallyconsideredthetubeshelltype3~5times.B.logarithmicmeantemperaturedifferenceisbig,smallterminaltemperaturedifferenceintubeandshellheatchangeover,twokindsoffluidflowintubesideandshellside,respectively,onthewholeiswrongflow,logarithmicmeantemperaturedifferencecorrectioncoefficientissmall,andtheplateheatchangeoverismoreandfloworcountercurrentflowmode,thecorrectioncoefficientisusuallyataround0.95,inaddition,coldandhotfluidflowintheplateheatchangeoverisparalleltotheheattransfersurface,nosidestream,thusmakestheplateheatchangeoverattheendofthetemperaturedifferenceissmall,thewaterheatchangeovercanbelessthan1℃,shellandtubeheatchangeoverisusually5℃.
C.coveranareaofanareasmallplateheatchangeoverstructureispact,perunitvolumeofheatexchangeareaoftubeandshellof2~5times,alsodon'tliketubeshelltypewanttoreserveasparetubebundleserviceplace,soforthesameinheat,plateheatchangeoverwhichcoversanareaofabout1/5~1/10oftubeandshellheatchangeover.
Platetypecooler
D.easytochangetheheattransferareaorprocessbination,aslongastheincreaseordecreaseafewpiecesofboard,canachievethepurposeofincreaseordecreaseheatexchangearea,Changeofplatesorreplaceafewpiecesofplate,canachievetherequiredprocessbination,adapttothenewworkingconditionofheattransfer,shellandtubeheatchangeoverheattransferareaisalmostimpossibletoincrease.(ofcourse,conversely,theneedtocalculatethepressurelossisinlinewiththesystemrequirements,aswellastheequipmentboltlengthisappropriate)
E.lightweightoftheplateheatchangeoverplatethicknessofonly0.4~0.8mm,thethicknessofheatexchangetubeandtubeheatchangeoveris2.0~2.5mm,tubeandshellofshellmuchheavierthantheframeworkofplateheatchangeover,plateheatchangeoverisgenerallyabout1/5oftheweightoftubeandshell.
Flowpriceofthesamematerial,underthesameheattransferarea,pricesofplateheatchangeovertubeandshelltypelowabout40%~60%.
G.convenientplateheatchangeoverheattransferplateismadebystampingprocessing,highdegreeofstandardization,andcanbemassproduction,usuallyusehandmadetubeheatchangeover.
H.easycleaningframetypeplateheatchangeoveraslongastheboltloosenesspressure,canloosenplatebeamandplateformechanicalcleaning,heattransferprocessoftheneedtoconstantlycleaningequipmentisveryconvenient.
I.onlyheattransferplateshellheatlosssmallplateheatchangeoverplateisexposedtoPlatetypecooleratmosphere,sotheheatlosscanbeneglected,alsodonotneedtoheatpreservationmeasures.Heatchangeoverofshellandtubeheatlossisbig,needtoheatinsulationlayer.
J.smallercapacityis10%~20%oftubeandshellheatchangeover.
K.thepressurelossofperunitlengthisbigbecausethegapbetweentheheattransfersurfaceissmall,theheattransfersurfacehasconcaveandconvex,thereforeisbiggerthantraditionalsmoothpipepressureloss.
L.noteasyscalingduetointernalfullyturbulent,sonoteasytoscale,thescalecoefficientisonlyoftubeandshellheatchangeover1/3~1/10.3applicationstoedit
A.refrigeration:usedforcondenserandevaporator.
B.hvac:useinthemiddleoftheboilerheatchangeover,high-risebuildingintermediateheatchangeover,etc.
C.chemicalindustry:sodaashindustry,syntheticammonia,alcoholfermentation,resinpositecooling,etc.
Platetypecooler
D.metallurgicalindustry:Illuminatiliquorheatingorcooling,steelmakingprocesscooling,etc.
E.machineryindustry:allkindsofquenchingliquidcooling,reducerlubricatingoilcooling,etc.
F.powerindustry:highvoltagetransformeroilcooling,oilcoolinggeneratorbearing,etc.
G.papermakingindustry:bleachingprocessheatrecovery,heatingwashslurry,etc.
H.textileindustry:viscoserayonaqueousalkalicooling,boilingnitrocellulosecooling,etc.
I.thefoodindustry:juicesterilizationcooling,animalandplantoilheatingorcooling.
J.greasetechnology:soapbaseambientpressure,heatingorcoolingofvariousprocesswithliquid.
K.centralheating:theheatingpowerplantwasteheatarea,heatthebathwater.
L.other:petroleum,medicine,shipbuilding,desalination,andgeothermal.
4scaleprocessingmeasurestoedit
1)intheoperationofthepassofwaterquality,thewaterinthesystemmustbedemoralizedwaterandsofteningtankforstrictqualitytesting,qualifiedaftercanbeinjectedintothework.
2)whenthenewsystemwasputintooperation,shouldbeseparateheatchangeoverandheatingsystem,afterthecycleforaperiodoftime,thenheatchangeoverincorporatedintothesystem,inordertoavoidimpuritiesintotheheatchangeoverwork.
3)intheheatingsystem,dirtseparatorandfiltershallconductregularcleaning,alsoshouldkeepthepipeworkofclean,inordertopreventtheheatchangeover.
致谢词
本设计在王松竹老师的悉心指导和严格要求下业已完成,从课题选择,方案论证到具体设计和调试,无不凝聚着王松竹老师的心血和汗水,在四年的本科学习和生活期间,也始终感受着导师的精心指导和无私的关怀,我受益匪浅.在此向王松竹老师表示深深的感谢和崇高的敬意.
不积跬步何以至千里,本设计能够顺利的完成,也归功于各位任课老师的认真负责,使我能够很好的掌握和运用专业知识,并在设计中得以体现.正是有了他们的悉心帮助和支持,才使我的毕业论文工作顺利完成,在此向湖南化工职业技术
厚度方面有关论文范文检索,与石油化工文题目今日相关发表论文参考文献资料：