Abad A, Filsouf A, Adánez-Rubio I, Mendiara T, de Diego L F, Izquierdo M T, Gayán P, Adánez J
Department of Energy and Environment, Instituto de Carboquímica (ICB), CSIC, 50018 Zaragoza, Spain.
Energy Fuels. 2024 Oct 28;38(21):21333-21344. doi: 10.1021/acs.energyfuels.4c03173. eCollection 2024 Nov 7.
Chemical looping with oxygen uncoupling (CLOU) is an advanced CO capture technology where an oxygen carrier supplies the gaseous oxygen required for combustion. The technology has experienced a significant development degree in the most recent decades, up to TRL 4. This study presents results that further prove the viability of this technology to TRL 5 in a continuous CLC unit with two interconnected circulating fluidized beds acting as fuel and air reactors. The oxygen carrier used in the experiments was a magnetic copper-based oxygen carrier denoted as Cu30MnFe. It was used in the combustion of three types of biomass and a bituminous coal (Taldinsky coal). The effects on char conversion, CO capture efficiency, and total oxygen demand of different parameters such as excess air ratio, fuel reactor temperature, residence time in fuel reactor, gas velocity in the carbon stripper, solid circulation rate, and solid inventory in fuel reactor were investigated. CO capture efficiency of 93% was achieved at 886 °C with pine sawdust combustion, while the total oxygen demand was 4.6%. In the experiments with bituminous coal, the effectiveness of the carbon stripper in improving the CO capture efficiency was demonstrated. During the highest load of coal, low total oxygen demands were achieved even at temperatures below 900 °C.
化学链氧解耦燃烧（CLOU）是一种先进的二氧化碳捕集技术，其中氧载体提供燃烧所需的气态氧。在最近几十年里，该技术取得了显著的发展，技术就绪水平达到了4级。本研究展示的结果进一步证明了该技术在一个由两个相互连接的循环流化床分别作为燃料反应器和空气反应器的连续化学链燃烧装置中达到技术就绪水平5的可行性。实验中使用的氧载体是一种磁性铜基氧载体，标记为Cu30MnFe。它被用于三种生物质和一种烟煤（塔尔丁斯基煤）的燃烧。研究了过量空气比、燃料反应器温度、在燃料反应器中的停留时间、碳脱除器中的气体速度、固体循环速率以及燃料反应器中的固体存量等不同参数对焦炭转化率、二氧化碳捕集效率和总需氧量的影响。在886℃下燃烧松木屑时，二氧化碳捕集效率达到了93%，而总需氧量为4.6%。在烟煤实验中，证明了碳脱除器在提高二氧化碳捕集效率方面的有效性。在煤的最高负荷期间，即使在低于900℃的温度下也实现了较低的总需氧量。
