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The reaction rate of carbon dioxide-nitrogen gas mixtures with a well-characterised high ash char derived from an inertinite-rich coal discard was investigated by experimentation and reaction rate modelling. Experimentation with a thermogravimetric analyzer at 87.5kPa and 287.5kPa between 850°C and 900°C and with 1mm diameter particles, similar to operating conditions used for bubbling fluidised bed...
An investigation was undertaken to determine the properties of high ash coal–chars derived from South African discards rich in inertinites, for the development of suitable overall reaction rate models at low temperatures (<900°C). Detailed characterisation results of the parent coal and chars prepared at 700°C and 900°C obtained from standard coal analytical methods, petrographic techniques, CCSEM...
Long-wave fluorescence relative intensity measurements and a vitrinite microelasticity index were used to determine oxidation levels in a suite of artificially oxidized coals. These petrographic parameters were correlated with the agglomeration responses of the coals. Very definite relations were found between the petrographic indicators of oxidation and the agglomeration rates of the coals.
Two petrographic methods, namely long-wave fluorescence intensity measurements and a vitrinite elasticity index, were developed and used to detect incipient oxidation in coals subjected to simulated weathering conditions. The two methods are based on different physical properties of coal. However, their sensitivity in detecting changes caused by oxidation was found to be equally high.
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