Process for treating coal using multiple dual zone steps
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United States of America Patent
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Jul 7, 2015
Grant Date -
Mar 14, 2013
app pub date -
Sep 13, 2011
filing date -
Sep 13, 2011
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Abstract
A process for treating agglomerating coal includes drying coal in a drying step, and treating the dried coal in an oxidizing step to form oxides sufficient to convert the coal into a substantially non-agglomerating coal. The oxidized coal is pyrolyzed in a pyrolysis step to form coal char, and the coal char is cooled. At least one of the drying, oxidizing, and pyrolyzing steps is a dual zone step, with the dual zone step having a first zone and a second zone, with the temperature of the second zone being higher than that of the first zone. The effluent from such a dual zone pyrolyzer are subjected to a condensation process to separate the effluents into liquids and on-gases, and the on-gases are combined with other available gases to achieve a composition of blended on-gases having a specific heat of at least about 0.50 Btu/lb-° F. (2.013 kJ/Kg ° C.) at 1200° F. (649° C.) and recirculated into the pyrolyzer.
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