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1、第４４卷第７期热力发电Vol?４４No?７２０１５年７月THERMALPOWERGENERATIONJuly２０１５??????????????????????????????????????????????????循环流化床锅炉生物质与煤混烧积灰腐蚀试验刘志１,雷秀坚２,汪佩宁１,胡康涛１,杨海瑞１(１．清华大学热科学与动力工程教育部重点实验室,北京１０００８４;２．四川白马循环流化床示范电站有限责任公司,四川内江６４１００５)[摘要]将３种不同金属管材样品环的气冷腐蚀探头置于某生物质与煤混烧的７５
2、t/h循环流化床(CFB)锅炉尾部烟道低温过热器前,通过空气冷却模拟过热器的管壁温度,获得３种混烧比例工况下(持续时间２４h)３种管材的积灰样品.利用扫描电子显微镜分析积灰的理化特性,探讨混烧比例和材料种类对积灰腐蚀的影响规律.结果表明:在测试工况下,样品环迎风面不存在明显积灰现象,而背风面积灰明显,且随着材料的不同而有所不同,但未发现明显腐蚀或金属磨损,表明碱金属含量相对较低的生物质与煤混烧并不会造成严重积灰及腐蚀.[关键词]CFB锅炉;过热器;煤;生物质;混烧;积灰;腐蚀[中图分类号]TK６[文献
3、标识码]A[文章编号]１００２Ｇ３３６４(２０１５)０７Ｇ００５０Ｇ０５[DOI编号]１０．３９６９/j．issn．１００２Ｇ３３６４．２０１５．０７．０５０ExperimentalstudyonashdepositionandcorrosioninaCFBboilercoＧfiringbiomasswithcoal１,LEIXiujian２,WANGPeining１,HUKangtao１,YANGHairui１LIUZhi(１．KeylaboratoryforThermalScienceandPow
4、erEngineeringofMinistryofEducation,TsinghuaUniversity,Beijing１０００８４,China;２．SichuanBaimaCFBDemonstrationPowerPlantCo．Ltd．,Neijiang６４１００５,China)Abstract:Duringashdecompositionandcorrosiontestsina７５t/hcirculatingfluidizedbed(CFB)boilerburningcoalandbiomas
5、s,thecorrosionprobeequippedwiththreekindsofmetalsampleswasplacedinfrontofthesuperheater,andthesuperheatertubewalltemperaturewassimulatedwithasystemofaircooling．Threekindsofmetaldepositionsampleswereobtainedinoperatingmode(durationtimeof２４hours)withthree
6、mixingratiosofcoalandbiomass．ThephysicochemicalpropertyofthesampleswasanaＧlyzedbySEMＧEDX．Theresultsshowthat,underthetestingconditions,nodepositionwasfoundatthewindside,andthedepositionformedattheleesidewasdifferentfordifferentmetallicmaterials．NomateriＧ
7、allossorsignificantcorrosionwasdetected．Itisprovedinthisstudythatdepositionsattheleesideofthesuperheaterwereprobablymoreseriousthanthatatthewindside,andthecoＧcombustionofcoalandbioＧmasscontaininglowlevelsofalkalimetalwillnotcauseseriousdepositionorcorro
8、sionandcanbeappliedinindustrialproduction．Keywords:CFBboiler,superheater,coal,biomass,coＧcombustion,ashdeposition,corrosion生物质是清洁的可再生能源,其总量丰富,合理严重的能源紧缺问题,而且可以有效地减少环境污[１Ｇ２]利用生物质替代部分化石燃料,不仅可以缓解日益染和CO２排放.燃料燃烧是生物质能利用的重收稿日期:２０１４Ｇ０６Ｇ２２
