A thermogravimetric method for the measurement of CO/CO2 ratio at the surface of carbon during combustion
A thermogravimetric method for the measurement of CO/CO2 ratio at the surface of carbon during combustion
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DOI：
10.1016/j.proci.2018.05.040
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发表时间：
2019
影响因子：
3.4
通讯作者：
Wenting Hu;Ewa J. Marek;Felix Donat;J. S. Dennis;S. Scott
中科院分区：
文献类型：
--
作者：
Wenting Hu;Ewa J. Marek;Felix Donat;J. S. Dennis;S. Scott
本文提出了一种测量燃烧过程中碳颗粒表面CO/CO2比值的新方法。这种热重法通过比较碳的消耗速度和具有快速氧化动力学的外部参考物质的氧化速度来推导出CO/CO2的比率，在这种情况下是铜。当燃烧由外部传质控制时，这种方法是有用的，这在大规模过程中经常遇到。用石墨和褐煤焦炭实验证明了该方法的可行性。结果表明，在∼为1%O2的气氛中，石墨在700~900℃之间生成CO_2，而褐煤半焦在700~800℃之间生成CO和CO_2的混合物，CO的比例随温度的升高而增加，在850℃以上，只生成CO。研究还发现，对于这种特殊的褐煤半焦，CO/CO2比值随着环境中pO2的降低而增加。
This work presents a new method of measuring the CO/CO2ratio at the surface of carbon particles during combustion. This thermogravimetric method deduces the ratio of CO to CO2by comparing the rate of consumption of carbon with the rate of oxidation of an external reference material with fast oxidation kinetics, in this case Cu. The method is useful when combustion is controlled by external mass transfer, commonly encountered in large-scale processes. The viability of this method has been demonstrated experimentally with graphite and a lignite char. It was found that in an atmosphere of ∼ 1% O2, the graphite produced CO2between 700 and 900 °C whilst the lignite char produced a mixture of CO and CO2between 700 and 800 °C with the proportion of CO increasing with temperature, and above 850 °C, only CO was produced. It was also found that for this particular lignite char, the ratio of CO/CO2increased with decreasingpO2in the environment.