Large-scale simulation of gasification reaction with mass transfer for metallurgical coke: Model development

Numazawa, Yui; Saito, Yasuhiro; Matsushita, Yohsuke; Aoki, Hideyuki

doi:10.1016/j.fuel.2020.117080

Cited by 16 publications

(12 citation statements)

References 25 publications

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“…In the comparison of the value predicted by the DAEM with the experimental one, the calculated and the experimental values corresponded well, and thus, it was confirmed that the analysis in this study is almost valid. As a future work, the kinetic parameters will be applied to large-scale simulation of coke degradation based on computational fluid dynamics 40 and contribute to improve the prediction accuracy of the numerical simulation.…”

Section: Discussionmentioning

confidence: 99%

Kinetic Modeling of CO₂ and H₂O Gasification Reactions for Metallurgical Coke Using a Distributed Activation Energy Model

et al. 2021

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A distributed activation energy model (DAEM) was applied to the kinetic analysis of CO 2 and H 2 O gasification reactions for pulverized metallurgical coke. The results of the scanning electron microscopy observations and CO 2 gas adsorption suggested that the gasification reaction occurs at the particle surface. Therefore, a grain model was employed as a gasification reaction model. The reaction rates of CO 2 and H 2 O gasification were evaluated based on the DAEM. The activation energy changed as the reaction progressed and hardly depended on the particle size. The activation energies were 200–260 kJ/mol in CO 2 gasification and 220–290 kJ/mol in H 2 O gasification. The frequency factor of H 2 O gasification was approximately 10 times larger than that of CO 2 gasification, regardless of the progress of the reaction. At the same activation energy level, the frequency factor showed a higher value with a decrease in the particle size. This result was consistent with the theory of the grain model and indicated that the gasification reaction of the pulverized coke with a micrometer scale occurs on the surface of the coke particle. Furthermore, the value predicted by the DAEM was in good agreement with the experimental one.

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Section: Discussionmentioning

confidence: 99%

Kinetic Modeling of CO₂ and H₂O Gasification Reactions for Metallurgical Coke Using a Distributed Activation Energy Model

et al. 2021

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“…Our analytical object is the coke model developed from the X-ray CT images of coke and has hundreds of millions of voxels. For the object, the gasification reaction with gas diffusion was simulated [1]. In this study, focusing on CO2 or H2O gasification reaction individually, the validity was investigated by the comparison with a lab-scale experiment.…”

Section: Extended Abstractmentioning

confidence: 99%

Validation study of Large-Scale Simulation of CO2 or H2O Gasification with Mass Transfer for Metallurgical Coke

Numazawa¹,

Matsushita²,

Aoki³

et al. 2021

Proceedings of the 6th World Congress on Momentum, Heat and Mass Transfer

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“…As the porous model of an analytical object, the same cylindrical coke to the previous study 23) was employed. This coke model was developed by stacking the X-ray CT images of coke produced from Goonyella coal in a coke oven with an electric heater.…”

Section: Analytical Objectmentioning

confidence: 99%

“…21) Our research group also conducted the analysis of gasification reaction with mass transfer for the porous model constructed from the X-ray CT images of coke. 22,23) In the previous study, 22) the porous model was developed from the X-ray CT images of coke, and the kinetic analysis of CO 2 gasification reaction with mass transfer for a part of the model. At low reaction temperature, the gas concentration of CO 2 distributed uniformly in the whole of the analytical object, and thus the rate-controlling step was chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

“…200 million voxels developed from X-ray CT images at reaction temperatures of 1 373 and 1 573 K was conducted. 23) In this previous study, the relationship between the rate-controlling step and the coke structure after reaction was investigated, and it was found that the structural change by reaction was affected by the initial structure rather than the gas concentration distribution of CO 2 . The structural change of coke can be quantitatively characterized by the investigation at higher temperature: rate-controlling step of gas diffusion because the gas concentration distribution of CO 2 changes by temperature.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation for the Temperature Dependency of Coke Degradation by CO<sub>2</sub> Gasification Reaction in a Blast Furnace

et al. 2020

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To quantitatively evaluate the temperature dependency of coke degradation by CO 2 gasification reaction in a blast furnace, kinetic analyses of gasification reaction with mass transfer for the coke model with approx. 200 million voxels developed from X-ray CT images at the reaction temperatures of 1 373, 1 573, 1 773 and 1 973 K were performed. At high reaction temperature, the gas concentration of CO 2 was high in the external area of the coke model, and the coke matrix voxels vanished mainly around the external surface. Distinguishing surface area of interface between a carbon matrix voxel and a pore voxel with the gas concentration of CO2 at a neighbor pore voxel, although the surface area with the high gas concentration of CO 2 accounted for the majority of the total surface area at 1 373 K, the ratio was lower at over 1 573 K than at 1 373 K. In addition to this, from the effectiveness factor of catalyst, the initial rate-controlling step was chemical reaction at 1 373 K but pore diffusion at over 1 573 K. Also, although the frequency distribution of local porosity showed unimodal regardless of the progress of reaction, the standard deviation calculated from the distribution was changed by reaction. The change rate of the standard deviation by reaction seemed to be larger at high reaction temperature than at low reaction temperature. The logarithm of the change rate hardly depended on reaction temperature under 1 573 K but was proportional to the inverse of the temperature over 1 573 K. This study quantitatively showed that the rate-controlling step affects the coke structure after reaction largely.

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Large-scale simulation of gasification reaction with mass transfer for metallurgical coke: Model development

Cited by 16 publications

References 25 publications

Kinetic Modeling of CO₂ and H₂O Gasification Reactions for Metallurgical Coke Using a Distributed Activation Energy Model

Kinetic Modeling of CO₂ and H₂O Gasification Reactions for Metallurgical Coke Using a Distributed Activation Energy Model

Validation study of Large-Scale Simulation of CO2 or H2O Gasification with Mass Transfer for Metallurgical Coke

Numerical Investigation for the Temperature Dependency of Coke Degradation by CO<sub>2</sub> Gasification Reaction in a Blast Furnace

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Large-scale simulation of gasification reaction with mass transfer for metallurgical coke: Model development

Cited by 16 publications

References 25 publications

Kinetic Modeling of CO2 and H2O Gasification Reactions for Metallurgical Coke Using a Distributed Activation Energy Model

Kinetic Modeling of CO2 and H2O Gasification Reactions for Metallurgical Coke Using a Distributed Activation Energy Model

Validation study of Large-Scale Simulation of CO2 or H2O Gasification with Mass Transfer for Metallurgical Coke

Numerical Investigation for the Temperature Dependency of Coke Degradation by CO<sub>2</sub> Gasification Reaction in a Blast Furnace

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Kinetic Modeling of CO₂ and H₂O Gasification Reactions for Metallurgical Coke Using a Distributed Activation Energy Model

Kinetic Modeling of CO₂ and H₂O Gasification Reactions for Metallurgical Coke Using a Distributed Activation Energy Model