Abstract:

A 5 kW_th two-stage fuel reactor of chemical looping combustion facility was successfully built to carry out the characteristic research of coal chemical looping combustion. The experiment focused on the influence of temperature and gasifying agent on the combustion compensation efficiency, carbon supplementation, outlet gas component, oxygen demand and carbon capture efficiency. The results showed that high temperature can significantly improve the combustion efficiency in which the CO₂ concentration was up to 92.1% at 900℃. With the increase of temperature, CO₂ capture efficiency and combustion compensation efficiency increased to 99.6% and 83.4% respectively, while the oxygen demand and carbon supplementation decreased to 12.1% and 4.8%. The CO₂ serving as gasifying agent had an adverse effect on reaction efficiency that the oxygen demand was increased to 23%. In addition, there was a small amount of particles agglomeration in FR-Ⅰ, but had a limited influence on fluidization.

Key words: CO₂ capture, chemical reactors, two-stage fuel reactor, coal combustion, gasifying agent

摘要：

在5 kW_th双级燃料反应器的化学链燃烧装置上，开展煤化学链燃烧特性研究，重点考察反应温度和气化介质对燃烧补偿率、碳增补率、出口气体组分浓度、额外耗氧率以及碳捕集效率的影响规律。实验结果表明，较高的反应温度能显著提高燃烧效率，900℃时出口烟气中CO₂浓度可达92.1%；随着反应温度升高，碳捕集率和燃烧补偿率分别上升至99.6%和83.4%，额外耗氧率和碳增补率下降至12.1%和4.8%。以CO₂为气化介质时，整体反应效率有大幅下降，额外耗氧率提高至23%。此外，在Ⅰ级FR反应器内发现有少量的团聚颗粒，但并未对流化产生影响。

关键词: 二氧化碳捕集, 化学反应器, 双级燃料反应器, 煤燃烧, 气化介质