载氧体在长周期的化学链燃烧中存在严重的烧结与团聚问题,极大限制了化学链燃烧的工业化进展.本文采用流化床结晶造粒的方法,制备出一种高比表面积的铜基载氧体,在流化床热重分析仪(fluidized bed thermogravimetric analyzer,FB-TGA)上对其进行了长期化学链燃烧(chemical looping combustion,CLC)循环测试,并对反应前后的载氧体颗粒进行了还原反应实验.实验结果表明,所制备载氧体在900℃的高温下氧化还原循环120次后,其反应活性保持稳定,且并未出现明显的烧结与团聚迹象.对循环前后的载氧体颗粒进行形貌表征分析可知,此种Cu基载氧体的比表面积高达40 m2/g以上,展现出良好的反应活性.此外,载氧体主要成分由CuAl2O4分解为Al2O3和CuO,其循环后仍呈光滑的球形颗粒,并维持多孔结构,活性组分Cu在颗粒表面高度分散.
Study on Long-term Redox Performance of Cu-based Oxygen Carrier in Chemical Looping Combustion
The problem of oxygen carrier(OC)sintering and agglomeration in long-term chemical looping combustion(CLC)limits its industrialization progress.In the paper,a kind of Cu-based oxygen carrier was prepared by the fluidized bed crystallization granulation method,and studied by long-term redox cyclic tests on a fluidized bed thermogravimetric analyzer(FB-TGA).The reactive activity measurement was conducted on the OC particles before and after the redox cycles.The results show that the reactivity of the OC particle remains stable after 24 h redox cycles,and there were no obvious sintering and agglomeration.The morphology characterization was carried out on the OC particles before and after the redox cycles.The BET of OC particles is up to 40 m2/g,resulting in better reaction activity.In addition,the main component in the OC particles was transformed from CuAl2O4 into Al2O3 and CuO after 24 h redox cycles.The Cu-based OC particles exhibit a smooth spherical structure after the redox cycles,and still maintain porous.The active Cu element is highly dispersed on the particle surface.
chemical looping combustioncu-based oxygen carrierfluidized bed thermogravimetric analyzersintering and agglomeration
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