资源描述:
《外文翻译--- 燃煤锅炉的燃烧进程控制》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、大连交通大学2009届本科生毕业设计外文翻译ControllingtheFurnaceProcessinCoal-FiredBoilersTheunstabletrendsthatexistinthemarketoffuelsuppliedtothermalpowerplantsandthesituationsinwhichtheparametersoftheiroperationneedtobechanged(orpreserved),aswellasthetendencytowardtheeconomicalandenvironmentalrequirem
2、entsplacedonthembecomingmorestringent,arefactorsthatmaketheproblemofcontrollingthecombustionandheattransferprocessesinfurnacedevicesveryurgent.Thesolutiontothisproblemhastwoaspects.Thefirstinvolvesdevelopmentofacombustiontechnologyand,accordingly,thedesignofafurnacedevicewhennewinst
3、allationsaredesigned.Thesecondinvolvesmodernizationofalreadyexistingequipment.Inbothcases,thetechnicalsolutionsbeingadoptedmustbeproperlysubstantiatedwiththeuseofbothexperimentalandcalculationstudies.TheexperienceCentralBoiler-TurbineInstituteResearchandProductionAssociation(TsKTI)a
4、ndZiOspecialistsgainedfromoperationofboilersandexperimentalinvestigationstheycarriedoutonmodelsallowedthemtoproposeseveralnewdesignsofmultifuelandmaneuverable—inotherwords,controllable—furnacedevicesthathadbeenputinoperationatpowerstationsforseveralyears.Alongwiththis,anapproximatez
5、ero-one-dimensional,zonewisecalculationmodelofthefurnaceprocessinboilershadbeendevelopedattheTsKTI,whichallowedTsKTIspecialiststocarryoutengineeringcalculationsofthemainparametersofthisprocessandcalculatestudiesoffurnacesemployingdifferenttechnologiesoffiringandcombustionmodes.Natur
6、ally,furnaceprocessadjustmentmethodslikechangingtheairexcessfactor,stackgasrecirculationfraction,anddistributionoffuelandairamongthetiersofburners,aswellasotheroperationswrittenintheboileroperationalchart,areusedduringboileroperation.However,theeffecttheyhaveontheprocessislimitedinn
7、ature.Ontheotherhand,controlofthefurnaceprocessinaboilerimpliesthepossibilityofmakingsubstantialchangesintheconditionsunderwhichthecombustionandheattransferproceedinordertoconsiderablyexpandtherangeofloads,minimizeheatlosses,reducetheextenttowhichthefurnaceiscontaminatedwithslag,dec
8、reasetheemissionsof