Effective Utilization Technique for Coal Having High Maximum Fluidity and Long Maximum Permeation Distance by Weathering Processing

Dohi, Yusuke; Fukada, Kiyoshi; Matsui, Takashi; Sumi, Hiroyuki

doi:10.2355/isijinternational.isijint-2018-813

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…Matsukawa et al 22) found that inert materials do not aggregate during coking of molded coal, suggesting that non-uniformity prior to coking is the cause of the concentration of inert materials. The research conducted by Dohi and colleagues [23][24][25] provided significant insights into the permeation distance and melting properties of coal. They proposed a novel measurement technique for permeation distance, in which a layer of glass beads, applied atop the coal bed, was subjected to pressure during heating.…”

Section: Introductionmentioning

confidence: 99%

“…Their findings suggested that coals characterized by longer permeation distances culminate in larger pore formations, which in turn compromise the structural integrity of the resultant coke. They proposed that mitigating the decline in strength could be achieved through the weathering 24) and crushing 25) of coals with longer permeation distances. A study conducted by Nagayama et al 26) scrutinized the adhesive forces between particles of two different types of coal.…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Evaluation of Internal Structure of Coke Made by Blending Non-coking Coal Using X-ray Computed Tomography

Matsukawa,

Nakamura,

Igawa

et al. 2024

ISIJ Int.

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Image analysis was performed on the analytical objects constructed by X-ray computed tomography images of coke with anthracite as low swelling and softening-melting coal to evaluate the pore structure three-dimensionally. The sphericity of the pores was calculated based on the volume and surface area of the pores. Tracers were inserted into all anthracite particles to distinguish coke matrices derived from anthracite from those derived from coking coal. This is the first success in identifying coke matrices derived from coking coal and those derived from other carbon source. The sphericity of pores in the surrounding area of the coke matrix derived from anthracite and the area without coke matrix derived from anthracite was extracted from the analytical object. The surrounding area of the coke matrix derived from anthracite contained more low-sphericity pores compared to the area without coke matrix derived from anthracite. This may be due to the free expansion of the coking coal in the surrounding area of the anthracite since the anthracite does not soften or expand during carbonization. The coking coal expanded excessively to fill the voids between the particles, resulting in the bubbles bursting and generating connected pores.

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