CFB鍋爐水冷壁磨損機理與防磨措施研究.pdf

1、華北電力大學(xué)(北京)碩士學(xué)位論文CFB鍋爐水冷壁磨損機理與防磨措施研究姓名：張華磊申請學(xué)位級別：碩士專業(yè)：動力機械及工程指導(dǎo)教師：劉宗德201103華北電力大學(xué)碩士學(xué)位論文AbstractAtpresent，thewearofwaterwalltubeisthemajorbottleneckwhichfestrictthedevelopmentofCFBboilersIthasbecomethefbc：usofCFBresearchto

2、studythewearmechanismandlookforef!l℃ctiveantiwearmeasuresInordert0analyzethewearmechanismofCFBboilertube，thispaperfirstsimulatetheintemalflowfieldofthefumaceonthebasisofactualdataofBaimaPowerPlantSimulationresultsreveale

3、datypicalcore—annulusnowpattemalongtheradicaldirectionThepaniclesflowupwardwithhighVelocityatthecentralregionanddownwardwithlowvelocitynearthewaU，fbmingtheinnercirculation0fgassolidnoVLTheaxialdistributionprofileofpanicl

4、econcentrationshowhighValueatthebottomofthefumacewhilelowintheupperzoneInaddition，muchhigllerparticleconcentrationandvelocitywereobservedatthecomerofthefunaceandthebottompartThatiswhythetubesinsuchareasarcsubjecttowearTh

5、eC0mputationalresultsagreedwiththeexperimentaldatareportedinthe1iteratureInthisstudy，theantiabrasiVecoatingswerepfeparedbyusingaselfmadeTlGcladdingsystemRapidwatercoolingconditionwasappliedinordertodecreasethedefbrmation

6、duringweldingprocess，thusenhancedtheperformanceofthecoatingsThemicrohardnessandheataffecteddepthofthecoatingswerecomparedunderdifferentoperationcurrentwiththeaimofobtainingoptimaloperationparametersFurtheranalysisshowedt

7、hatthemicrostruturesofthecoatingsareuniformMetallurgicalbondingwasformedbetweenthecoatingandthesubstrateMoreoverthemicr0hardnessofthecoatingisupto1200HVwhichissixtimeshjgherthanthatof20GTherefofe，thecoatinghasperfectwear