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Evaluation of Different Red Muds as Oxygen Carriers in a Fluidized Bed Thermogravimetric Analyzer
Energy & Fuels ( IF 5.3 ) Pub Date : 2021-09-03 , DOI: 10.1021/acs.energyfuels.1c02456
Qi Hong 1 , Tianxu Shen 1 , Peng Wang 2 , Laihong Shen 2 , Leming Cheng 3 , Tao Song 1
Affiliation  

The developed fluidized bed thermogravimetric analyzer (FB-TGA) brings meaningful scientific contribution to the materials engineering on the basis of full achievement of the fluidized bed advantages in a micro scale. Red mud (RM), as a byproduct of the alumina industry, contains active Fe2O3, a high content of Na, as well as some inert Al2O3 and SiO2. In this work, three kinds of different red mud (LSRM, XFRM, and LBRM) were used as oxygen carriers, and the chemical looping combustion (CLC) characteristics were evaluated in an FB-TGA using H2 as the reactant, with the objective of exploring the interaction behavior of these constant elements and further detecting the influence on the reactivity and stability of the red muds. The multiple redox cycle performance of different red muds, based on the attrition rate, oxygen carrier conversion, reaction rate, and oxygen transfer capacity in each cycle, was investigated. Various red muds demonstrate different reaction behaviors during multiple redox cycles. The LBRM sample possesses the best attrition resistance in comparison to the other red muds and experiences an activation process with its rate index increasing with the cycles and stabilizing at 1.6800%/s after 80 cycles. During the CLC process, for the Ca-rich red mud, the Ca element tends to act as a support in the form of Ca2Al2SiO7, while the Na element exists in the form of NaAlSiO4 for all the red mud samples. Ca2Al2SiO7 and NaAlSiO4 are stable materials with a high melting point and act as inert supports to sustain the chemical reactivity of the red-mud-based oxygen carriers.

中文翻译:

在流化床热重分析仪中评价不同赤泥作为氧气载体

开发的流化床热重分析仪(FB-TGA)在充分发挥流化床微观优势的基础上,为材料工程带来了有意义的科学贡献。赤泥 (RM) 作为氧化铝工业的副产品,含有活性 Fe 2 O 3、高含量的 Na 以及一些惰性的 Al 2 O 3和 SiO 2。在这项工作中,三种不同的赤泥(LSRM、XFRM 和 LBRM)被用作氧载体,并在使用 H 2的 FB-TGA 中评估了化学循环燃烧(CLC)特性。作为反应物,目的是探索这些常数元素的相互作用行为,进一步检测对赤泥反应性和稳定性的影响。基于每个循环的磨损率、氧载体转化率、反应速率和氧转移能力,研究了不同赤泥的多次氧化还原循环性能。各种赤泥在多次氧化还原循环中表现出不同的反应行为。LBRM 样品与其他赤泥相比具有最好的耐磨性,并经历了一个活化过程,其速率指数随着循环次数的增加而增加,并在 80 次循环后稳定在 1.6800%/s。在CLC过程中,对于富Ca赤泥,Ca元素倾向于以Ca 2 Al 2的形式作为载体SiO 7,而Na元素以NaAlSiO 4的形式存在于所有赤泥样品中。Ca 2 Al 2 SiO 7和NaAlSiO 4是具有高熔点的稳定材料并且作为惰性载体来维持基于红泥的氧载体的化学反应性。
更新日期:2021-09-16
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