A thermogravimetric method for the measurement of CO/CO2 ratio at the surface of carbon during combustion |
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| Authors: | Wenting Hu Ewa Marek Felix Donat John S Dennis Stuart A Scott |
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| Institution: | 1. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, United Kingdom;2. Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge CB3 0AS, United Kingdom;3. School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom;4. Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich 8092 Zürich, Switzerland |
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| Abstract: | This work presents a new method of measuring the CO/CO2 ratio at the surface of carbon particles during combustion. This thermogravimetric method deduces the ratio of CO to CO2 by 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 CO2 between 700 and 900 °C whilst the lignite char produced a mixture of CO and CO2 between 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/CO2 increased with decreasing pO2 in the environment. |
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| Keywords: | 2 Mass transfer Combustion Coal char Thermogravimetry |
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