钙基吸收剂循环煅烧碳酸化反应捕集CO2研究

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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