Effect of pre-oxidation on reactivity of chars in steam |
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Authors: | Kenichi Gomi Yukio Hishinuma |
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Affiliation: | Hitachi Research Laboratory, Hitachi Limited, Kuji-cho, Hitachi-shi, Ibaraki-ken, 319-12 Japan |
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Abstract: | The effects of pre-oxidation of char from Taiheiyo coal, a non-caking bituminous coal, in the 400–550 °C temperature range on its gasification reactivity with N2-H2O at 0.1 MPa (steam partial pressure of 13.2 kPa) have been investigated. The pre-oxidation of char markedly enhances gasification rates at temperatures between 800 and 900 °C. Reactivity is found to parallel the burn-off level during preoxidation at low temperatures (400–430 °C), whereas at relatively high temperatures (480–550 °C), the burn-off level only affects the reactivity slightly. The amount of CO and CO2 evolved from the preoxidized char by heat treatment is proportional to the burn-off level at low temperatures (400–430 °C), being closely related to the enhancement of the gasification reactivity in steam. |
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Keywords: | bituminous coal coal char oxidation gasification |
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