循环流化床锅炉水冷壁磨损机理及防磨技术研究

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1、循环流化床锅炉水冷壁磨损机理及防磨技术研究(申请中国石油大学工学博士学位论文)华东学科专业：研究方向：博士生：指导教师：油气储运工程油气储运系统安全工程邓化凌王勇(教授)ResearchonAbrasionMechanismandAnti-abrasionTechnologiesoftheWater-WallinCirculatingFluidizedBedBoilersABSTRACTThecirculatingfluidizedbed(CFB)boilerisakindofmodemcombustionequipment、Ⅳimmanyadvantages．Butsomet

2、roubles．especiallytheseriousabrasionproblemintheboilersarenowhinderingtheapplicationanddevelopmentoftheCFBboilers．Itisofmomentoustheoreticalandpracticalsignificancetoresearchonthemechanismandanti—abrasiontechnologiesoftheCFBboilers．Throughmakingobservationsandinspectionsonthemacroscopicandmi

3、cro—appearanceoftheabrasionarea,andanalyzingonthefailurecauses，laws，andinfluencefactorsoftheabrasiononthewater-walltubesofseveralcirculatingfluidizedbedboilers，themechanismoftherapidfailureprocessoftheboilertubesWasstudiedandtheabrasionmodeloflocalareaonthetubesWasproposed，whichisnamedtinyzo

4、nechiseldig(TZCD)abrasionhere．TheresultsindicatethatitisthelocalTZCDabrasionwhichcausedtherapidfailureoftubes，whilenottheregularandlargea托aabrasioncausedbylongdistance‘planedig’or‘ploughdig’bytheparticlesintheCFBboiler．OncetheTZCDabrasionbegins，iftheworkingconditionsdon’tchange，itwillbelasti

5、ngandwillmakeatinyanddeepholeduringashortoftime，untilthetubeexplodesmpidly．Themicro—appearanceoftheabrasionholeismadellpoflotsofsmallplaneswhichintersectwitlleachotherwithacertainangle．Thecombinationofimpactwimlargerimpingementangleandscourwearwitllsmalleranglebytheparticles．togetherwitllthe

6、secondaryabrasionbythebrokennon-rigidparticlescomposedtheweal'mechanism．Theprocessofthefailurebehaviorontheareabelowappearselasticfatigueemerging，thenductilitydeformationsproducing,andthensurfacemicro-crackscomingintobeing，andtheductilitylayerfallingoff．Inthisprocess，theabrasionrateisthemost

7、fast．Thefailureprocessonthebottomoftheabrasionholeismoremicro-SCOUrtogetherwithlittleimpactWearandwiththerelativelyfastwearrate．Theloseoftheoxidesontheslopeofthebothsidesoftheholeformsanotherfailureprocesswiththeslowestwearrate．Inviewoftheabrasionc