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Title:
METHOD OF BLENDING COAL AND SELECTING COAL TYPE IN THE PRODUCTION OF BLAST FURNACE COKE
Document Type and Number:
Japanese Patent JP2020094200
Kind Code:
A
Abstract:
To provide a method of blending coal that allows more non-fine coking coal to be blended in the production of coke.SOLUTION: A method of blending coal for producing blast furnace coke, which is characterized in that [i] (a) the relationship (α1) between the void filling degree of a blended coal and the surface breaking strength of a coke and (b) the relationship (α2) between the shrinking ratio of the blended coal and the volume ratio of fractured powder of the coke are obtained; [ii] coal type, targeted coke strength, and target shrinking ratio j are set; [iii] the relationship (β2) that satisfies (β1) is obtained, wherein (β2) means the relationship between the void filling ratio of the blended coal and the blending ratio of a low VM non-fine coking coal and (β1) means the relationship between the upper limit of blending ratio of non-fine coking coals and the blending ratio of a low VM non-fine coking coal, and wherein the upper limit of the blending ratio of non-fine coking coals means the highest blending ratio of the low VM non-fine coking coal that could be additionally blended, without causing a change in the shrinking ratio j, to a base blend of the coking coal and a high VM non-fine coking coal; [iv] volume ratio of fractured coke powder that satisfies the shrinking ratio j is obtained from (α2); [v] void filling ratio d required to satisfy the surface breaking strength is obtained from (α1); and [vi] upper limit f of the blending ratio of non-fine coking coals is obtained from void filling ratio d, (β2) and (β1).SELECTED DRAWING: Figure 4

Inventors:
KAWASHIRO NANAMI
HAYASHIZAKI HIDEYUKI
UEBO KAZUYA
Application Number:
JP2019215576A
Publication Date:
June 18, 2020
Filing Date:
November 28, 2019
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C10B57/04
Attorney, Agent or Firm:
Aoki Atsushi
Shinji Mitsuhashi
Fukuchi Ritsuo
Saito Manabu