燃煤锅炉卫燃带耐火材料结渣机理与结渣程度的模糊评判

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1、中南大学博士学位论文燃煤锅炉卫燃带耐火材料结渣机理与结渣程度的模糊评判姓名：何金桥申请学位级别：博士专业：热能工程指导教师：时章明;陈冬林20081201摘要关。渣／板粘结处渣样的结晶度越大，渣板之间的粘结程度越小。一般而言，渣板粘结处灰渣结晶度小于30％时将发生严重结渣，而当大于70％后结渣较为轻微。氧化铝质耐火材料制作的卫燃带更适合应用于燃用灰分中碱性金属氧化物含量较高煤种的锅炉，而SiC质耐火材料卫燃带则适合应用于燃煤锅炉燃烧温度较低，还原性气氛较强的初始燃烧段。本文最后从煤灰在耐火板上的结渣粘结机理出发，结合渣／板粘结处灰渣的结晶度指标对熔融煤灰在耐火板上的结渣程度进

2、行模糊聚类评判，全面地反映了熔融煤狄在耐火板材料上的结渣程度，并能够对这一结渣过程给予准确的数值描述，避免了结渣程度评判的片面性。关键词燃煤锅炉，卫燃带，熔融煤灰，结渣机理，结晶度，模糊评判II中南犬学博十学位论文ABSTRACTTheashcontentofcoalforourcountrycoal-firedboilerscommonlyiShighand10Wwithheatvalueandvolatility．Inordertoimprovetheignition，stablecombustionandburning—outabilityofinferiorcoal，

3、thecoal-firedboilerhaswidelyadoptfire—resistantliner,while，theslaggingproblemofmoltencoalashonthefire．resistantlinerappears，whichCanchangethecombustionaerodynamicstatusinthefurnaceandthefluegastemperatureathearthexport，thenchangeheattransferofvapourandwaterofboilers．Itaffectsstableoperation

4、ofboiler,leadstothesfeaccidentofboilereven．Betolightenandavoidslaggingonthefire—resistantliner,itisnecessarytofullystudymoltenashdepositionandslaggingmechanismwithrefractorymaterialandfollowtomakereasonablyjudgmentforslaggingextent．Therehasanimportantpracticalsignificancetorationallychoicea

5、nddesignrefractorymaterialofliner,adiustandimprovecoalcombustionandensuresafelyandeffectiveoperationofcoal．firedboilers．Thisdissertationreliesontheprojectofmoltencoalashsedimentmechanismandactiononrefractorymaterialsupportedbythenationalnaturalsciencefoundation．firstlythroughstaticerosionex

6、perimentsofmoltencoalashontherefractorymaterialboardinhightemperaturemuf!fleanalyzedthemoltencoalashchemicalreactionmechanismonthesurfaceofrefractoryboard，thediffusionandsegregationmechanismofelementcompositionsofcoalashandrefractoryboardduringerodingandslaggingbymicroscopicmethods．Secondly

7、consideringtheinfluenceofcombustionstatustoslagduringcoal—pulverizedtorchburning，coal．pulverizedtorchsimulationexperimentsinnozzleshorizontalfumacewerecarriedout．analyzeddiffusionmechanismofsedimentcoalashonrefractoryboardsindifferentplacesofcoal．pulveri