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1、Fuel84(2005)1768–1777www.fuelfirst.comChemicalfractionationtestsonSouthAfricancoalsourcestoobtainspecies-specificinformationonashfusiontemperatures(AFT)baaJ.C.vanDyk*,L.L.Baxter,J.H.P.vanHeerden,R.L.J.CoetzeraSasolTechnology,R&DDivision,SyngasandCoalTechno
2、logies,P.O.Box1,Sasolburg1947S,SouthAfricabBrighamYoungUniversity,350CB,Provo,UT84602,USAReceived6July2004;receivedinrevisedform4April2005;accepted6April2005Availableonline11May2005AbstractCoalsfromthedifferentsourcesusedbySasolvarysubstantiallyintermsof
3、chemicalandphysicalpropertiesanddirectlyrelatestogasifierbehavior.Duetothelargevariationincoalpropertiesfromvarioussources,detailedcoalandfeedstockcharacteristicsareessentialtopredictgasificationperformancewhenaspecificcoalsourceistobegasified.Onepropertytha
4、tspecificallygivesdetailinformationonthesuitabilityofacoalsource[AlpernB,NahuysJ,MartinezL.Mineralmatterinashyandnon-washablecoals—itsinfluenceonchemicalproperties.CommunServGeolPortugal1984;299–317.]forgasificationpurposesistheashfusiontemperature(AFT).The
5、AFTofacoalsourceindicatestheextenttowhichashagglomerationandashclinkeringarelikelytooccurwithinthegasifier.Ashclinkeringinsidethegasifiercancausechannelburning,pressuredropproblemsandunstablegasifieroperation.Theprincipleaimofthispaperistoobtainmineralspeci
6、es-specificinformationonashpropertiesandthespecificaffectonAFT.ChemicalfractionationtreatmentresultedincoalshavingdifferentmineralpropertiesthatcanbeusedtoexplaintheaffectofspecificmineralsontheAFTofcoal.Thehighestconcentrationandspeciesofmineralswereremove
7、dfromthecoalbyacidleaching(HClandHNO3)whereAl,Ca,Mg,NaandFewereremovedinhighconcentrationsfromthecoal.AninterestingfindingintheashcompositionofthecoalafterleachingwasthattheSO3concentrationdecreasedfromO2mass%intheoriginalcoalsourcesto!0.3mass%aftertheaci
8、dleaching.TheAFTofcoalafterleachingincreasedtoO16008C.Basedonthe95%confidenceintervalsdepictedthefollowingcomponentscanbehighlightedashavingastatisticalsignificanteffectontheAFT:Al2O3,Fe2O3,CaO,MgO,P2O5andSiO2–Al2O3combinati
