CuO supported on olivine as an oxygen carrier in chemical looping processes with pine sawdust used as fuel
CuO supported on olivine as an oxygen carrier in chemical looping processes with pine sawdust used as fuel
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橄榄石负载 CuO 作为氧载体，用于以松木屑为燃料的化学循环过程
DOI：
10.1016/j.cej.2017.07.175
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发表时间：
2017-12
影响因子：
15.1
通讯作者：
Hu Mian
中科院分区：
文献类型：
--
作者：
Wang Xun;Xu Tingting;Jin Xiaoyu;Hu Zhiquan;Liu Shiming;Xiao Bo;Chen Zhihua;Hu Mian
化学循环是一种很有前途的低成本二氧化碳捕集技术，且能源消耗较低。在本研究中，研究了橄榄石负载的 CuO（CuO/橄榄石）作为化学链燃烧（CLC）和氧解偶联化学链（CLOU）中的氧载体（OC）。通过热重分析（TGA）评估反应活性和氧解偶联行为。使用松木屑 (PS) 作为燃料的 CLC 和 CLOU 实验在流化床反应器中进行。探讨了 CuO/橄榄石的 CLC 循环性能以及氧释放和吸收行为。在 CLC 实验中，碳转化率 (χc) 和碳捕获效率 (ηc) 都随着温度的升高和 OC 与燃料比 (Φ) 的增加而增加； χcan 和 ηc 的最大值分别为 96.81% 和 95.54%，在 900 °C 且 Φ = 1.50 时达到。在CLC循环测试中，CuO/橄榄石表现出稳定的反应活性，第20次循环时χcan和ηc值分别为94.64%和92.59%。在 CLOU 测试中，通过 TGA 获得了 3.55% 的氧传输能力 (Ro)。在流化床反应器中，在 950 °C 的温度下，松木 PS 也实现了完全转化，且 ηc= 99.29%。在新鲜的 CuO/橄榄石样品中发现了 MgCu2O4，并且它在第一个氧化还原循环中立即消失；大部分 CuO 积聚在橄榄石表面，然后在额外的循环中逐渐扩散并覆盖橄榄石。 20 个 CLC 循环后。 CuO/橄榄石OC的CuO含量略有下降，从38.81%降至35.22%；抗碎强度保持在 4.8 N，并且没有观察到明显的团聚现象。 CuO/橄榄石具有优异的循环性能，可作为化学循环过程中良好的OC候选物。
Chemical looping is a promising low-cost technology for CO2capture with a low energy penalty. In this study, CuO supported on olivine (CuO/olivine) was investigated as an oxygen carrier (OC) in chemical looping combustion (CLC) and in chemical looping with oxygen uncoupling (CLOU). The reactivity and oxygen uncoupling behavior were evaluated by thermogravimetric analysis (TGA). CLC and CLOU experiments using pine sawdust (PS) as fuel were conducted in a fluidized-bed reactor. The CLC cyclic performance and the oxygen release and uptake behaviors of CuO/olivine were explored. In CLC experiments, both carbon conversion (χc) and carbon capture efficiency (ηc) increased with increasing temperature and with increases in OC-to-fuel ratio (Φ); the maximum value ofχcandηc—96.81% and 95.54%, respectively—were achieved at 900 °C with Φ = 1.50. In CLC cyclic tests, the CuO/olivine displayed stable reactivity, and the values ofχcandηcwere 94.64% and 92.59% at the 20th cycle, respectively. In the CLOU tests, oxygen transport capacity (Ro) of 3.55% was obtained via TGA. Complete conversion of pine PS andηc= 99.29% were also achieved at 950 °C in a fluidized bed reactor. MgCu2O4was found in the fresh CuO/olivine sample and it disappeared immediately during the first redox cycle; most of CuO accumulated on the olivine surface and then gradually spread and covered the olivine upon additional cycles. After 20 CLC cycles. CuO content of the CuO/olivine OC decreased slightly from 38.81% to 35.22%; a crushing strength of 4.8 N was maintained, and no significant agglomeration was observed. The CuO/olivine has an excellent cyclic performance and it can be used as a good OC candidate in chemical looping processes.
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