Method of producing modified coal, and modified coal

Patent metadata

Field	Value
Publication number	US-2016348022-A1
Application number	US-201515111629-A
Country	US
Kind code	A1
Filing date	Jan 15, 2015
Priority date	Jan 30, 2014
Publication date	Dec 1, 2016
Grant date	—

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.

First claim

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.

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.

8 : A modified coal produced by the process for producing a modified coal according to claim 1 .

Assignees

• Kobe Steel Ltd

Inventors

• Furuya Atsushi
• Shigehisa Takuo
• Takahashi Yoichi
• Higuchi Toru
• Yamamoto Seiichi
• Watanabe Hiroki
• Shimizu Takahiro

Classifications

• C10L9/08

  by heat treatments, e.g. calcining · CPC title

• C10L5/36

  Shape · CPC title

• C10L2290/06

  Heat exchange, direct or indirect · CPC title

• C10L5/04 Primary

  Raw material {of mineral origin} to be used; Pretreatment thereof {(pretreatment of fuels of non-mineral origin C10L5/40)} · CPC title

• C10L2290/146

  of water · CPC title