Filsouf A, Adánez-Rubio I, Mendiara T, Abad A, Adánez J
Carboquimica Institute, Miguel Luesma Castán, 4, 50018 Zaragoza, Spain.
Energy Fuels. 2024 Oct 4;38(20):19548-19558. doi: 10.1021/acs.energyfuels.4c02464. eCollection 2024 Oct 17.
Chemical-looping combustion (CLC) stands out as a promising method for carbon capture and storage for the purpose of mitigating climate change. The process involves the conversion of fuel facilitated by an oxygen carrier, with the resulting CO inherently separated from other air components. Notably, when applied to biomass combustion this process offers a pathway to achieving negative CO emissions. However, a significant challenge for CLC, particularly in its application to biomass, is the management of interactions between ash and oxygen carriers. Biomass-derived ashes typically contain substantial quantities of reactive ash-forming substances, such as alkaline and alkali earth elements. These interactions can impact the performance and longevity of the oxygen carrier, necessitating careful consideration and mitigation strategies in CLC systems utilizing biomass feedstocks. This study examined the interaction between biomass ash components and two recently developed oxygen carriers, Cu30MnFekao7.5 and Cu30MnFe, during combustion in a 1.5 kW continuous unit. Both oxygen carriers achieved 100% combustion efficiency and a CO capture efficiency of 95% at 900 °C. Although the copper in both oxygen carriers did not exhibit any noticeable interaction with ash components, the accumulative presence of potassium and magnesium in Cu30MnFekao7.5 was identified by inductively coupled plasma and scanning electron microscopy with energy dispersive X-ray analysis, indicating an increase in the amount of both elements in the particles after combustion operation. No problems of agglomeration or fluidization were observed in any of the experiments.
化学链燃烧（CLC）作为一种有前景的碳捕获与封存方法，可用于缓解气候变化。该过程涉及在氧载体的作用下将燃料进行转化，生成的一氧化碳会自然地与其他空气成分分离。值得注意的是，当应用于生物质燃烧时，此过程为实现负碳排放提供了一条途径。然而，化学链燃烧面临的一个重大挑战，尤其是在其应用于生物质时，是灰分与氧载体之间相互作用的管理。生物质衍生的灰分通常含有大量活性成灰物质，如碱金属和碱土金属元素。这些相互作用会影响氧载体的性能和寿命，因此在使用生物质原料的化学链燃烧系统中需要仔细考虑并制定缓解策略。本研究在一个1.5千瓦的连续装置中，考察了生物质灰分成分与两种最近开发的氧载体Cu30MnFekao7.5和Cu30MnFe在燃烧过程中的相互作用。在900℃时，两种氧载体均实现了100%的燃烧效率和95%的一氧化碳捕获效率。尽管两种氧载体中的铜均未与灰分成分表现出任何明显的相互作用，但通过电感耦合等离子体和带有能量色散X射线分析的扫描电子显微镜，确定了Cu30MnFekao7.5中钾和镁的累积存在，这表明在燃烧操作后颗粒中这两种元素的含量有所增加。在任何实验中均未观察到团聚或流化问题。
