Performance Evaluation of a Chinese Lean Iron Ore as the Oxygen Carrier in Multi and Short-Time Redox Cycles
Performance Evaluation of a Chinese Lean Iron Ore as the Oxygen Carrier in Multi and Short-Time Redox Cycles
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DOI：
10.3390/app8050682
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发表时间：
2018-04
期刊：
影响因子：
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通讯作者：
Xudong Wang;Xiaojiao Wang;H. Xiaoyu;Y. Shao;Zhaoyang Jin;Baosheng Jin
中科院分区：
文献类型：
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作者：
Xudong Wang;Xiaojiao Wang;H. Xiaoyu;Y. Shao;Zhaoyang Jin;Baosheng Jin
在固定床反应器中研究了中国贫铁矿作为氧载体在化学循环燃烧中的性能。考虑到副中试实验装置中燃气与载氧体接触时间短，在反应器中采用短的CO注入时间来模拟这一事件。 CO的注入时间分别设置为60 s、50 s和40 s，以研究其对氧载体反应活性的影响。每种条件下共进行100次循环反应，测试氧载体的反应稳定性。使用 SEM、XRD 和 BET 对反应前后的氧载体进行了表征。结果表明，在初始循环期间存在反应活性的激活过程。反应时间的延长有利于CO扩散到载氧体中，可以提高CO的转化率，同时可以在载氧体中形成更大的孔体积，有利于气体扩散。然而，它导致Fe2SiO4的形成并在表面严重烧结，这不利于氧载体反应活性的稳定性。
The performance of a Chinese lean iron ore as the oxygen carrier in chemical looping combustion was investigated in a fixed bed reactor. Considering the short contact time between the fuel gas and oxygen carrier in the sub-pilot experimental setup, the short injection time of CO was employed in the reactor to simulate this event. The injection time of CO was set to 60 s, 50 s and 40 s respectively, to investigate its effects on the reactivity of the oxygen carrier. A total of 100 cyclic reactions under each condition were carried out to test the reactivity stability of the oxygen carrier. The oxygen carriers prior and after reactions were characterized using SEM, XRD and BET. Results showed that there was an activation process of the reactivity during initial cycles. The extension of the reaction time was beneficial to the diffusion of CO into the oxygen carrier and could improve the conversion of CO. Also, it could form larger pore volumes for gas diffusion in the oxygen carrier. However, it led to the formation of the Fe2SiO4 and severe sintering on the surface, which was harmful to the stability of the oxygen carrier’s reactivity.