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Abstract:
The experimental study on the Yangquan high-ash coal catalytic gasification with mixing-gas (air/steam) by using solid alkali (sodium hydroxide) or waste liquid of viscose fiber as the catalyst in a small-scale fluidized bed with 28 mm i.d. was carried out. The loading saturation levels (LSL) of two catalysts in Yangquan high-ash coal are about 6%. Under the gasification temperature ranging from 830°C to 900° and from 900° to 920°, the apparent reaction order of Yangquan high-ash coal with respect to the unreacted carbon fraction approximates to 2/3 and 1/3 for the non-catalyst case, respectively. Also, the different values of apparent reaction order in the two temperature ranges are presented for the case with 3% solid alkali catalyst loaded. At the low temperature ranging from 830°C to 860°, the apparent reaction order of catalytic gasification is 1 since enough active carbon sites on the coal surface are formed during the catalytic gasification by solid alkali. But at the high temperature ranging from 860° to 920°, the sodium carbonate produced by the reaction of solid alkali with carbon dioxide can be easily fused, transferred and re-distributed, which affects the gasification reaction rate, and the apparent reaction order of catalytic gasification is reduced to 1/3.
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Journal of Fuel Chemistry and Technology
ISSN: 0253-2409
Year: 2005
Issue: 5
Volume: 33
Page: 544-549
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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