化工进展ChemicalIndustryandEngineeringProgress2023年第42卷第3期CaSO4载氧体在煤气化化学链燃烧中的脱汞范昀培1,金晶1,刘敦禹1,王静杰2,刘秋祺1,许开龙1(1上海理工大学能源与动力工程学院,上海200093;2哈尔滨锅炉厂有限责任公司高效清洁燃煤电站锅炉国家重点实验室,黑龙江哈尔滨150046)摘要:为了研究载氧体在煤气化化学链燃烧中的脱汞机理,选择CaSO4载氧体作为研究对象,900℃的反应温度下,在还原反应器中通入CO2气体和水蒸气作为气化介质进行实验。结果表明:以CaSO4作为载氧体的煤气化化学链燃烧中,CaSO4载氧体本身促进Hg0的氧化,但CaSO4分解产生的SO2抑制Hg0的氧化。CaSO4促进煤气化化学链燃烧产生S单质,会进一步与Hg0反应生成多种复杂的HgSn,降低了烟气中Hg0含量,提高了脱汞效率。同时CaSO4载氧体在还原-氧化的循环反应中具有良好的循环特性,是一种优良的化学链载氧体。关键词:化学链燃烧;汞;载氧体;硫酸钙;煤燃烧;循环流化床;气化中图分类号:TK16文献标志码:A文章编号:1000-6613(2023)03-1638-11MercuryremovalbyCaSO4oxygencarrierduringin-situgasificationandchemical-loopingcombustionofcoalFANYunpei1,JINJing1,LIUDunyu1,WANGJingjie2,LIUQiuqi1,XUKailong1(1SchoolofEnergyandPowerEngineering,UniversityofShanghaiforScienceandTechnology,Shanghai200093,China;2StateKeyLaboratoryofEfficientandCleanCoal-FiredUtilityBoilers,HarbinBoilerCompanyLimited,Harbin150046,Heilongjiang,China)Abstract:Tounderstandthemechanismofmercuryremovalbyoxygencarriersduringin-situgasificationandchemical-loopingcombustionofcoal,weusedCaSO4asoxygencarrierandCO2andwatervaporasgasificationmediuminareductionreactorworkingat900℃.ResultsshowedthattheCaSO4oxygencarrieritselfpromotedtheoxidationofHg0,buttheSO2producedbythedecompositionofCaSO4inhibitedtheoxidationofHg0.CaSO4promotedthechemical-loopingcombustionofcoaltoproduceelementS,whichwouldfurtherreactwithHg0togenerateavarietyofcomplexHgSn.This,reducedtheHg0contentinthefluegasandimprovedthemercuryremovalefficiency.Inaddition,theCaSO4oxygencarrierhasgoodcyclecharacteristicsinthereduction-oxidationcyclicreactions,indicatinganexcellentchemical-loopingoxygencarrier.Keywords:chemical-loopin...