Coke manufacturing method

Patent metadata

Field	Value
Publication number	US-9701907-B2
Application number	US-201314646514-A
Country	US
Kind code	B2
Filing date	Nov 13, 2013
Priority date	Nov 22, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A coke manufacturing method includes preparing blended coal by blending coal of at least two types, stirring and mixing the blended coal so as to disintegrate at least a part of pseudo-particles in the blended coal that have been formed by agglomeration of coal particles, and charging the blended coal after stirring and mixing into a coke oven and carbonizing the blended coal so as to manufacture coke.

First claim

The invention claimed is:

1. A coke manufacturing method comprising:
preparing blended coal by blending coal of at least two types;
stirring and mixing the blended coal to disintegrate at least a part of pseudo-particles in the blended coal that have been formed by agglomeration of coal particles; and
charging the blended coal after stirring and mixing into a coke oven and carbonizing the blended coal to manufacture coke,
wherein the stirring and mixing is performed on blended coal having a moisture content of not less than 6% by mass.

2. The coke manufacturing method according to claim 1 , wherein the preparing comprises drying the coal of at least two types.

3. The coke manufacturing method according to claim 1 , wherein the preparing comprises grinding the coal of at least two types before blending the coal of at least two types.

4. A coke manufacturing method comprising:
preparing blended coal by blending coal of at least two types:
stirring and mixing the blended coal to disintegrate at least a part of pseudo-particles in the blended coal that have been formed by agglomeration of coal particles; and
charging the blended coal after stirring and mixing into a coke oven and carbonizing the blended coal to manufacture coke,
wherein the stirring and mixing comprises stirring and mixing the blended coal using a mixing device having stirring and mixing performance with which an attainment level calculated from the following equation (1) becomes not less than 0.6 after sixty seconds has passed from start of a stirring and mixing operation:
Attainment Level=( V max −V ( t ))/( V max −V st )  (1)

where the attainment level is a value calculated from brightness of mixture formed by putting 95% by mass of calcium carbonate having an average particle diameter of 2.66 μm and 5% by mass of iron(III) oxide having an average particle diameter of 0.47 μm into the mixing device and performing the stirring and mixing operation, t indicates an elapsed time from the start of the stirring and mixing operation, V max indicates brightness of calcium carbonate, V st indicates brightness of the mixture in which calcium carbonate and iron(III) oxide are totally mixed, and V(t) indicates brightness of the mixture at time t in the equation (1).

5. A coke manufacturing method comprising:
preparing blended coal by blending coal of at least two types;
stirring and mixing the blended coal to disintegrate at least a part of pseudo-particles in the blended coal that have been formed by agglomeration of coal particles; and
charging the blended coal after stirring and mixing into a coke oven and carbonizing the blended coal to manufacture coke,
wherein the stirring and mixing comprises stirring and mixing the blended coal using a mixing device that requires power per unit mixing volume of not less than 1.0×10 4 W/m 3 .

6. The coke manufacturing method according to claim 4 , wherein the preparing comprises grinding the coal of at least two types before blending the coal of at least two types.

7. The coke manufacturing method according to claim 4 , wherein the preparing comprises drying the coal of at least two types.

8. The coke manufacturing method according to claim 5 , wherein the preparing comprises grinding the coal of at least two types before blending the coal of at least two types.

9. The coke manufacturing method according to claim 5 , wherein the preparing comprises drying the coal of at least two types.

Assignees

• Jfe Steel Corp

Inventors

• Dohi Yusuke
• Fukada Kiyoshi
• Matsui Takashi
• Honma Michio
• Shinohara Masahiro
• Nagayama Mikiya

Classifications

• C10G33/06 Primary

  with mechanical means, e.g. by filtration · CPC title

• C10K1/18

  hydrocarbon oils {(C10K1/165 takes precedence)} · CPC title

• C10B47/04

  in shaft furnaces · CPC title

• C10K1/00

  Purifying combustible gases containing carbon monoxide (isolation of hydrogen from mixtures containing hydrogen and carbon monoxide C01B3/50) · CPC title

• C10B53/04 Primary

  of powdered coal · CPC title