Products from rapid heating of a brown coal in the temperature range 400–2300 °C |
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Authors: | David I Cliff Kenneth R Doolan John C Mackie Ralph J Tyler |
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Affiliation: | 1. CSIRO Division of Fossil Fuels, PO Box 136, North Ryde, NSW 2113, Australia;1. Department of Physical Chemistry, University of Sydney, NSW 2006, Australia |
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Abstract: | The devolatilisation behaviour of Yallourn brown coal was investigated under rapid heating conditions using two different flash pyrolysers: a fluid-bed reactor giving coal particle heating rates of 104 °Cs?1 with a gas residence time of about 0.5 s and a shock tube which generated heating rates of the order of 107 °Cs?1 and a 1 ms reaction time. Yields of products are reported covering pyrolysis temperatures in the range 400–2300 °C. Hydrocarbon gas yields reached maximum values which were remarkably similar for both reactors although occurring at different temperatures. Carbon oxide production was also similar for both reactors with CO yields reaching 30% wt/wt daf coal. These high yields of CO are very different from those reported for slow heating conditions. It appears that on flash heating, coal decomposition pathways change in a manner which increases CO yields at the expense of H20 and to a lesser extent C02, resulting in the volatilisation of additional carbon from the coal. |
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Keywords: | coal rapid heating products |
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