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ID:37391795
大小:9.50 MB
页数:150页
时间:2019-05-23
《钙基吸收剂循环煅烧碳酸化反应捕集CO2研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、东南大学博士学位论文钙基吸收剂循环煅烧/碳酸化反应捕集CO<,2>研究姓名:李英杰申请学位级别:博士专业:热能工程指导教师:赵长遂20090622东南大学博士学位论文吸收剂展现出了良好的工业应用前景。采用分形理论描述天然钙基吸收剂微观结构,首次研究了CaO在循环煅烧/碳酸化反应中的分形特征,得出了CaO在循环反应中分形维数随反应参数的变化规律,建立了CaO分形维数与其C02捕集性能之间的内在联系,在分形维数D≤2.63的实验范围内,CaO分形维数与其循环碳酸化转化率呈线性正相关。关键词:钙基吸收剂:煅烧:碳
2、酸化:循环反应:改性;C02捕集ⅡABSTRACTABSTRACTItiswellknownthatthecarbondioxide(C02)emissionincreaseisresponsibleforglobalwarming.Itisnotimetodelayforlarge-scaleC02captureintheearth.Coal—firedpowerplantsastheconcentrativesourceofC02aretheprimecandidatestoapplyC02captur
3、e.TherearemanydifferentC02captureprocesses。however,theirtechno-economicfeasibilityforindustrialapplicationsmustbeconsidered.Theso-calledconceptofcalciumloopingcycle,i.e.calcium-basedsorbentcarbonation/calcinationloopingisoneofthemostfeasiblewaysforcapturin
4、gC02fromcoal-firedpowerplantsinlarge-scale.ThenovelC02captureprocessusingtheadvancedPFBC-CC(APFBC-CC)wasfh'sflyproposedtosolvetheproblemthatthegenerationefficiencyoftheconventionalPFBC—CCwaslowduringtheC02capture.ThenovelC02captureprocesswassimulated.There
5、sultsshowthatthesystemefficiencyoftheAPFBC-CCCanachieveashighas41%atthetypicalcondition,whentheC02captureefficiencyis89.62%.Thereactioncharacteristicsofnaturalcalcium-basedsorbentssuchaslimestoneanddolomitewereinvestigatedduringthecycliccalcination/carbona
6、tion.Theeffectsofcarbonationtemperature,calcinationtemperature,particlesizeandC02partialpressureincarbonationandcalcinationatmospheresoilthecycliccarbonationbehaviorofthenaturalcalcium-basedsorbentwereverified.Thevariationbehaviorsofspecificsurfacearea,por
7、evolumeandporesizedistributionofthenaturalsorbentswereanalyzedduringthemultiplecycles.ThefeasibilityofshellasaC02sorbentwasdiscussedforthefirsttime.Theshellpossessesabundantpores..BasedonC02capturecharacteristicsofthenaturalcalcium-basedsorbentsduringthecy
8、cliccalcination/carbonationreactions,forthefirsttime,C02capturebehaviorsofthemodifiednaturalcalcium-basedsorbentsbyaddingKMn04,usingethanolsolution,aceticacidsolutionandricehuskashweresystematicallyinvestigat
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