Migration of inert materials during coking of molded coal

Matsukawa, Yoshiya; Nakamura, Yusuke; Numazawa, Yui; Igawa, Daisuke; Mizutani, Takashi; Aoki, Hideyuki

doi:10.1016/j.ceja.2023.100526

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…Several studies have investigated the coalescing properties of coal to evaluate inter-particle adhesion. 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.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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Characterization of Porosity Changes during Reaction of Coke and Coke Analogues with CO₂ Using Micro‐Computer Tomography

Longbottom,

Jenkins,

Dong

et al. 2024

steel research int.

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Understanding the porosity of coke and how it changes during reaction is key for understanding coke reactivity and minimizing coke consumption in the blast furnace. The change in porosity of coke and coke analogue samples after reaction with CO2 is assessed using high‐resolution micro‐computer tomography (micro‐CT) scans. High‐resolution micro‐CT scans (2.35 μm voxel−1) are carried out before and after reaction with CO2 at 1100 °C. 3D micro‐CT measurements are validated against standard 2D measurements, and used to quantitatively assess the porosity evolution in the samples. The porosity and pore connectivity of the coke and analogue samples increase in reaction with CO2. Most of the increase in porosity occurs in the pores <60 μm. Inert maceral‐derived component (IMDC) regions in coke A are more reactive than reactive maceral‐derived component (RMDC) regions. This is possibly related to the higher proportion of fine pores in unreacted IMDC compared to RMDC. Characterization of larger coke and coke analogue samples using micro‐CT at lower resolution (9.65–16.72 μm voxel−1) allows the rate‐controlling mechanism to be determined as likely to be mixed control, with both chemical reaction and pore diffusion‐controlling reaction rate. This finding demonstrates that high‐ and lower‐resolution micro‐CT datasets should be considered complementary.

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Migration of inert materials during coking of molded coal

Cited by 2 publications

References 23 publications

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

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

Characterization of Porosity Changes during Reaction of Coke and Coke Analogues with CO₂ Using Micro‐Computer Tomography

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Migration of inert materials during coking of molded coal

Cited by 2 publications

References 23 publications

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

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

Characterization of Porosity Changes during Reaction of Coke and Coke Analogues with CO2 Using Micro‐Computer Tomography

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Characterization of Porosity Changes during Reaction of Coke and Coke Analogues with CO₂ Using Micro‐Computer Tomography