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US 2016/0348022 A1Published application
Method of producing modified coal, and modified coal
AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe 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.
Claims8
1:
- A process for producing a modified coal from a coal of low-rank as a raw material, comprising:
- a step of dehydrating the coal;
- 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 105° C. or less.
7 more elements
2:
- The process for producing a modified coal according to claim 1, wherein the oxidized coal after the oxidation step has a water content of 1% by mass or more and 13% by mass or less.
3:
- The process for producing a modified coal according to claim 1, wherein the agglomerated coal after the agglomeration step has a water content of 2% by mass or more and 15% by mass or less.
4:
- The process for producing a modified coal according to claim 1, further comprising, after the oxidation step, a step of grinding the oxidized coal and a step of secondarily adding water for dusting prevention to the ground coal.
5:
- The process for producing a modified coal according to claim 4, wherein in the secondary water addition step, an added amount of the water is regulated so that the ground coal after the secondary water addition has a water content of 10% by mass or more and 16% by mass or less.
6:
- The process for producing a modified coal according to claim 1, wherein in the water addition step, some or all of the water is added to the dehydrated coal by mixing a raw material coal containing water with the dehydrated coal.
7:
- The process for producing a modified coal according to claim 1, wherein:
- in the oxidation step, the agglomerated coal is oxidized by a conveyance with one or a plurality of belt conveyors;
- and
- the belt conveyor includes a belt on which the agglomerated coal is to be placed and a heat reserving vessel which surrounds at least a part of the belt.
1 more element
8:
- A modified coal produced by the process for producing a modified coal according to claim 1.