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1、第43卷第9期燃摇料摇化摇学摇学摇报Vol.43No.92015年9月JournalofFuelChemistryandTechnologySep.2015文章编号:0253鄄2409(2015)09鄄1044鄄08准东煤掺烧高岭土对固钠率及灰熔融特性影响研究沈铭科,邱坤赞,黄镇宇,王智化,刘建忠(浙江大学能源清洁利用国家重点实验室热能工程研究所,浙江杭州摇310027)摘摇要:选择常见的黏土矿物高岭土作为准东煤添加剂掺烧,研究了不同掺混比例、不同燃烧温度下添加剂的固钠率和煤灰熔融特性的变化,结合XRD谱
2、图和三元相图研究了灰中矿物在高温下的演变过程。结果表明,固钠率随高岭土掺混比例增加逐渐增大,在0~2%时增长较快,2%~5%增长较慢,随燃烧温度升高略微下降;掺混后煤灰熔点随掺混比例先缓慢减小,再快速减小,后快速增加,在3%时达到1200益左右;XRD和三元相图分析结果表明,煤灰熔融特性变化是由于灰中硅钙石、钙黄长石和钙长石矿物比例的变化引起,发生低温共熔现象是导致掺混比例为3%和4%时煤灰熔点最低的主要原因;当掺混比例为2%时,固钠率在60%以上且灰熔点在1300益左右,利于固态排渣,当掺混比例为3.0
3、%~4.0%时,灰熔点在1200益左右,利于液体排渣。关键词:准东煤;高岭土;固钠率;灰熔融特性;低温共熔中图分类号:TQ534摇摇文献标识码:AInfluenceofkaolinonsodiumretentionandashfusioncharacteristicduringcombustionofZhundongcoalSHENMing鄄ke,QIUKun鄄zan,HUANGZhen鄄yu,WANGZhi鄄hua,LIUJian鄄zhong(StateKeyLaboratoryofCleanEnerg
4、yUtilization,ZhejiangUniversity,Hangzhou摇310027,China)Abstract:ThecommonclaymineralofkaolinwasselectedasanadditiveintoZhundongcoalduringcombustion.Sodiumretentionratesandcoalashfusiontemperatureswereinvestigatedatdifferentblendingratiosandtemperatures.XRD
5、andternaryphasediagramwereusedtoidentifymineraltransformationsathightemperatures.Theresultsshowthatthesodiumretentionratesincreaserapidlywithblendingratiofrom0~2%,slowlyfrom2%~5%anddecreaseslightlywithincreasingtemperature.Theashfusiontemperaturesofcoalbl
6、endedwithadditiveinitiallydecreaseslowly,thendecreaserapidlyandfinallyincreasewithincreasingblendingratio,reachingabout1200益at3%.TheresultsofXRDandternaryphasediagramanalysisshowthatthechangeofashfusiontemperatureisduetothemineralcontentchangesofrankinite
7、,gehleniteandanorthite.Thelowestashfusiontemperaturesattheblendingratiosof3%and4%aremainlycausedbythelowtemperatureeutecticphenomenon.Thesodiumretentionratereachesmorethan60%andashfusiontemperaturereachesabout1300益atblendingratioof2%,whichisconductivetoso
8、lid鄄stateslag鄄tapboiler.Theashfusiontemperatureisabout1200益atblendingratioof3.0~4.0%,whichissuitableforliquid鄄stateslag鄄tapboiler.Keywords:Zhundongcoal;kaolin;sodiumretentionrate;ashfusiontemperature;eutecticphenome
