Method of producing modified coal, and modified coal
AssigneeKobe Steel, Ltd.
InventorsAtsushi Furuya, Takuo Shigehisa, Yoichi Takahashi, Toru Higuchi, Seiichi Yamamoto, Hiroki Watanabe, Takahiro Shimizu
Life of this patent
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Abstract
A process for producing a modified coal from a coal of low-rank as a raw material includes dehydrating the coal, adding water to the dehydrated coal, agglomerating the water-added coal, and gradually oxidizing the agglomerated coal. In the water addition, an added amount of the water is regulated so that the water-added coal has a water content of 5% by mass or more and 20% by mass or less. In the oxidation, the agglomerated coal is held in an air at a temperature of 70° C. or more and 105° C. or less.
Claims11
A process for producing a modified coal from a coal of low-rank as a raw material, comprising:
- a step of in-oil dehydrating the coal of low-rank;
- a step of adding water to the dehydrated coal;
- a step of agglomerating the water-added coal;
- and
- a step of gradually oxidizing the agglomerated coal,
- wherein:
- in the water addition step, an added amount of the water is regulated so that the water-added coal has a water content of 5% by mass or more and 20% by mass or less;
- and,
- in the oxidation step, the agglomerated coal is held in an air at a temperature of 70° C. or more and 100° C. or less,
- wherein an oxygen consumption rate of the oxidized coal after the oxidation step is 1 mg/g/day or less.
Dependencies are inferred from the claim text.