Experimental study of influence of temperature on fuel-N conversion and recycle NO reduction in oxyfuel combustion
Experimental study of influence of temperature on fuel-N conversion and recycle NO reduction in oxyfuel combustion
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DOI：
10.1016/j.proci.2010.06.014
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Shaozeng Sun;Huali Cao;Hao Chen;Xiaoyu Wang;Juan Qian;T. Wall
中科院分区：
文献类型：
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作者：
Shaozeng Sun;Huali Cao;Hao Chen;Xiaoyu Wang;Juan Qian;T. Wall
用烟煤检验 O2/CO2 环境中的煤燃烧，其中气相和焦炭燃烧阶段分别考虑。研究了温度（1000-1300℃）和过量氧比λ（0.6-1.4）对挥发性氮和焦氮转化为NOx的影响。此外，还研究了在各种条件下燃料-N 还原循环 NOx 的情况。结果表明，O2/CO2 中燃料-N 向 NO 的转化率低于 O2/N2 中。在 O2/CO2 气氛中，在富燃料和贫燃料条件下，挥发性氮转化率分别为 1-7% 到 15-24%。在富燃料和贫燃料条件下，炭-氮转化率分别为 11-28% 和 30-50%。在富燃料和贫燃料条件下，温度对挥发性N向NO转化的影响是相反的。观察到富燃料和贫燃料条件下炭-氮转化的显着差异。循环NO还原实验数据表明，在高温贫燃料条件下，挥发性N的添加可以增强气相反应对循环NO的还原，而在富燃料条件下，挥发性N的影响相互抵消，总体影响较小。在较高温度下，NO/炭反应与燃料-N 向 NO 的转化相互竞争。
Coal combustion in O2/CO2environment was examined with a bituminous coal in which the gas-phase and char combustion stages were considered separately. The effects of temperature (1000–1300°C) and the excess oxygen ratio λ (0.6–1.4) on the conversion of volatile-N and char-N to NOx were studied. Also, the reduction of recycle NOx by fuel-N was investigated under various conditions. The results show that fuel-N conversion to NO in O2/CO2is lower than that in O2/N2. In O2/CO2atmosphere, the volatile-N conversion ratios vary from 1–7% to 15–24% under fuel-rich and fuel-lean conditions, respectively. The char-N conversion ratios are 11–28% and 30–50% under fuel-rich and fuel-lean conditions, respectively. The influences of temperature on the conversion of volatile-N to NO under fuel-rich and fuel-lean conditions are contrary. A significant difference for char-N conversion in fuel-rich and fuel-lean conditions is observed. The experimental data of recycle NO reduction indicate that the reduction of recycle NO by gas-phase reaction can be enhanced by volatile-N addition in fuel-lean condition at high temperature, while in fuel-rich condition, the volatile-N influence cancelled out and the overall impact is small. NO/char reaction competes with the conversion of fuel-N to NO at higher temperatures.