Experimental and numerical study on degradation behavior of coke with CO2 or H2O gasification reaction at high temperature

Ono, Yuya; Fukuda, Yujiro; Sumitani, Yuya; Matsukawa, Yoshiya; Saito, Yasuhiro; Matsushita, Yohsuke; Aoki, Hideyuki; Shishido, Takahiro; Okuyama, Noriyuki

doi:10.1016/j.fuel.2021.122061

Cited by 20 publications

(9 citation statements)

References 32 publications

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“…Numazawa et al 22,23) investigated reaction mechanisms of coke degradation by CO 2 , and they found that the rate-determining step changed from reaction rate to gas diffusion at 1100 ºC. Ono et al 16) showed that pore structure inside a coke after CO 2 gasification at 1100 ºC was uniform. The gasification temperature of the present study was much lower than these previous works.…”

Section: Hot Strength Of Lignite-cokementioning

confidence: 99%

“…Nevertheless, there have been only a few studies related to the coke's hot strength, and the difference between hot strength and cold strength is currently not well understood. Ono et al 16) carried out a three-point bending test for a thin coke chip with a load of 200 g, and measured the displacement until the breakage. The sample was heated under N 2 and then gasified by CO 2 or H 2 O before the test.…”

Section: Introductionmentioning

confidence: 99%

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Hot Strength of Coke Prepared by Briquetting and Carbonization of Lignite

et al. 2022

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The hot strength of coke prepared from an acid-washed lignite by briquettingcarbonization before and after CO 2 gasification was, for the first time, investigated in this work. The hot strength at 1000 ºC before gasification was higher than coke strength measured at a room temperature. CO 2 gasification resulted in a linear decrease of the hot strength with the reaction time. The lignite-coke showed faster decrease in the strength during gasification, compared to conventional cokes derived from caking coal or non-or slightly caking coal, due to the high reactivity caused by its porous structure and catalytic metal species remaining even after the acid-washing, while it showed superior hot strength at the initial stage of gasification.

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Section: Hot Strength Of Lignite-cokementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hot Strength of Coke Prepared by Briquetting and Carbonization of Lignite

et al. 2022

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“…The dissected blast furnace [ 5 ] showed that the coke solution loss reaction influenced the gas permeability of the upper part of BF [ 6 , 7 , 8 ], and there are many references available in this field [ 9 , 10 ]. In addition, the thickness of the coke layer is also an important factor affecting the distribution of gas flow.…”

Section: Introductionmentioning

confidence: 99%

Study on the High-Temperature Interaction between Coke and Iron Ores with Different Layer Thicknesses

Wang,

Du,

Diao

et al. 2024

Materials

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Coke plays a key role as the skeleton of the charge column in BF. The gas path formed by the coke layer in the BF has a decisive influence on gas permeability. At high temperatures, the interface between coke and ore undergoes a melting reaction of coke and a reduction reaction of ore. The better the reducibility of the ore, the more conducive it is to the coupling reaction of ore and coke. The melting loss reaction of coke becomes more intense, and the corresponding strength of coke will decrease, which will affect the permeability of the blast furnace and is not conducive to the smooth operation of the blast furnace. Especially with a deterioration in iron ore quality, BF operation faces severe challenges, which makes it necessary to find an effective way to strengthen BF operation. In this study, a melting-dropping furnace was used to develop and clarify the high-temperature interaction between coke and iron ores with different layer thicknesses. The influencing factors were studied by establishing a gas permeability mathematical model and observing the metallographic microscope images of samples after the coke solution loss reaction. The relationships between coke layer thickness, distribution of gas flow, and pressure drop were obtained. The results showed that, under certain conditions, the gas permeability property of a furnace burden has been improved after the coke layer thickness increased. Upon observing the size of coke particles at the interface reaction site, the degree of melting loss reaction can be determined. A smaller particle size indicates more melting loss reaction. A dripping eigenvalue for molten metal was introduced to evaluate the dynamic changes in the comprehensive dripping properties of molten metal of furnace burden, which showed that the dripping eigenvalue for the molten metal could deteriorate because of the unruly thickness and the coke layer thickness should be limited through considering the operational indicators of the blast furnace.

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“…The coke strength after gasification is known as CSR. [12][13][14][15] Ono et al 16) showed that coke was fractured during H 2 O or CO 2 gasification at a high temperature under mechanical pressure. The result indicated that the coke strength was degraded by the gasification.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Material Constants of Hot Coke under Inert Atmosphere

et al. 2023

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The strength, pore structure, and material constants of coke prepared from caking coal (Coke A) and non-or slightly caking coal (Coke C) were experimentally and numerically investigated with a particular focus on those values at high temperatures. Coke A showed higher strength and lower porosity than Coke C. The pore structure imaged by X-ray computed tomography was translated to the finite element mesh with the image-based modeling, and the stress analysis based on the finite element method was performed to calculate the mode value of maximum principal stress at different Young's modulus and Poisson's ratio. Young's modulus of Coke A and Coke C at a constant Poisson's ratio decreased and increased, respectively by heating. When the temperature increased, the compression stress of Coke A increased. The result indicated that the coke strength could be increased by heating because of the decrease in apparent Young's modulus, accompanied by the occurrence of creep.

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Experimental and numerical study on degradation behavior of coke with CO2 or H2O gasification reaction at high temperature

Cited by 20 publications

References 32 publications

Hot Strength of Coke Prepared by Briquetting and Carbonization of Lignite

Hot Strength of Coke Prepared by Briquetting and Carbonization of Lignite

Study on the High-Temperature Interaction between Coke and Iron Ores with Different Layer Thicknesses

Estimation of Material Constants of Hot Coke under Inert Atmosphere

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