在二维热态可视化流化床实验平台上深入研究了O2/N2和O2/CO2气氛下单个煤颗粒燃烧特性.实验中流化床床温为1088 K,O2浓度为10％～40％,拟球形煤颗粒粒径为6 mm,两根热电偶分别记录煤燃烧过程中颗粒中心及表面温度的变化规律.实验结果表明:O2/CO2气氛下O2扩散速率低于O2/N2气氛,使得煤颗粒的平均表观燃烧速率、升温速率及温度峰值降低,燃尽时间延长;提高O2浓度后燃烧特性得以改善.为获得与空气气氛相近的燃尽时间,O2/CO2气氛下O2浓度约需25％,但O2浓度需30％才可达到和空气气氛相近的燃烧温度峰值.
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