摘要
在煤加压化学链燃烧试验装置上,以巴西CVRD铁矿石为载氧体,徐州煤为燃料,进行了煤加压化学链燃烧还原/氧化循环反应试验研究.试验结果表明:随还原/氧化循环次数增加,载氧体反应能力有所增加,载氧体及碳的转化率基本保持稳定;提高反应压力,CO2的捕获效率增加,载氧体还原程度加深,载氧体以及燃料的转化率增加.对载氧体进行表征分析结果表明,随循环次数增加,载氧体颗粒比表面积及孔容积逐渐增加.高压下载氧体颗粒的平均孔径减少,且没有明显发现Fe基载氧体与煤灰相互作用形成复杂的化合物导致载氧体不可逆失活.SEM分析表明,随着循环反应进行,载氧体表面变为疏松多孔状结构,没有发现载氧体颗粒的团聚、烧结现象.试验结果表明该铁矿石载氧体可以应用于煤加压化学链燃烧.
Pressurized chemical-looping combustion combined cycle（PCLC） system is proposed for processing coal with high system efficiency and low CO2 sequestration cost.In this work,PCLC of coal was carried out in a laboratory scale fluidized bed reactor to study the cyclic performance of CVRD iron ore oxygen carries with Xuzhou bituminous coal.Experiment results show that more pyrolysis gas is oxidized by the oxygen carrier with the redox cycles going on.The carbon conversion maintains approximately the same with the cycle numbers increasing.The oxygen carrier and carbon conversions increase with the reaction pressure increasing.X-ray diffraction（XRD） analysis indicates that the extent of reduction level increases with the cycle numbers and pressures.No detectable formation of compound of iron oxide and coal ash is observed.Scanning electron microscope analyses（SEM） show that the oxygen carries become porous.Agglomeration of particles is not observed in all experiments.The experimental results indicate that the iron-based oxygen carrier can be used in PCLC applications.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第5期985-991,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(50606006)
国家高技术研究发展计划(863计划)资助项目(2009AA05Z312)
关键词
加压化学链燃烧
铁基载氧体
燃煤
CO2捕获
pressurized chemical-looping combustion
iron-based oxygen carrier
coal
CO2 capture
