Differences in reactivity of pulverised coal in air (O2/N2) and oxy-fuel (O2/CO2) conditions
Differences in reactivity of pulverised coal in air (O2/N2) and oxy-fuel (O2/CO2) conditions
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DOI：
10.1016/j.fuproc.2009.02.009
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发表时间：
2009-06-01
影响因子：
7.5
通讯作者：
Moghtaderi, Behdad
中科院分区：
文献类型：
--
作者：
Rathnam, Renu Kumar;Elliott, Liza K.;Moghtaderi, Behdad
在模拟空气（O-2/N-2）和氧-燃料（O-2/CO2）环境下，使用保持在1673 K的落管炉（DTF）和在高达1473 K的非等温（加热）条件下运行的热重分析仪（TGA）测量了四种粉碎的澳大利亚煤的反应性。氧气浓度，覆盖范围广，实用性强.在O-2/N-2和O-2/CO2的混合物中，在3至21体积%的范围内变化和5至30体积%，分别对于所有研究的煤，在DTF中以CO2测量的表观挥发分产率大于N-2。TGA中的热解实验还揭示了在相对高的温度下在CO2气氛中的额外质量损失，而在N-2气氛中未观察到。在DTF中测量的煤燃尽在几个O-2浓度显示显着较高的燃尽两种煤和类似的燃尽其他两种煤在氧燃料条件下。与焦炭的TGA实验也揭示了较高的反应性在高温和低O-2浓度。结果是一致的焦炭-CO2反应过程中的挥发分产率实验，但额外的实验是必要的，以解决机制确定的差异，煤燃尽。(C)2009爱思唯尔有限公司版权所有。
The reactivity of four pulverised Australian coals were measured under simulated air (O-2/N-2) and oxy-fuel (O-2/CO2) environments using a drop tube furnace (DTF) maintained at 1673 K and a thermogravimetric analyser (TGA) run under non-isothermal (heating) conditions at temperatures up to 1473 K. The oxygen concentration, covering a wide and practical range. was varied in mixtures Of O-2/N-2 and O-2/CO2 in the range of 3 to 21 vol.% and 5 to 30 vol.%, respectively. The apparent volatile yield measured in CO2 in the DTF was greater than in N-2 for all the coals studied. Pyrolysis experiments in the TGA also revealed an additional mass loss in a CO2 atmosphere, not observed in a N-2 atmosphere, at relatively high temperatures. The coal burnout measured in the DTF at several O-2 concentrations revealed significantly higher burnouts for two coals and similar burnouts for the other two coals in oxy-fuel conditions. TGA experiments with char also revealed higher reactivity at high temperatures and low O-2 concentration. The results are consistent with a char-CO2 reaction during the volatile yield experiments, but additional experiments are necessary to resolve the mechanisms determining the differences in coal burnout. (C) 2009 Elsevier B.V. All rights reserved.