Effect of Volatile Matter and Thermoplastic Components on Softening and Swelling Behavior in Carbonization of Coal

Saito, Yasuhiro; Miyamoto, Yukinori; Ono, Yuya; Numazawa, Yui; Matsuo, Shohei; Matsushita, Yohsuke; Aoki, Hideyuki; Hayashizaki, Hideyuki

doi:10.2355/isijinternational.isijint-2017-607

Cited by 4 publications

(11 citation statements)

References 15 publications

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“…Saito et al concluded that a large amount of "released" volatile matter increases the swelling ratio, based on the assumption that all the volatile matter measured by TGA was used to swell the coal. 14) Our conclusion here is the opposite. A small amount of escaped gas corresponds to a low mass transfer coefficient.…”

Section: Resultsmentioning

confidence: 58%

“…Toishi et al and Saito et al investigated the porous structure as well as the different swelling ratios for different types of cokes. 13,14) They explained the swelling behavior by the volatile matter and fluidity, which correspond to the gas generation rate and minimum viscosity in this simulation, respectively. The amount of volatile matter during heating was measured by the weight loss in thermogravimetric analysis (TGA), which corresponds to the gas escape in this study.…”

Section: Resultsmentioning

confidence: 74%

“…In coal science and engineering, a coal is experimentally characterized by several physical properties, including the temperature of maximum weight loss rate in thermogravimetric analysis (TGA) and the maximum fluidity temperature by Gieseler plastometry. 14) These temperatures may correspond to the peak temperatures of gas generation rate and viscosity in the simulation shown in Fig. 1.…”

Section: Resultsmentioning

confidence: 81%

“…5. In the experiment of Saito et al, 14) prior to the TGA measurement, the sample coal was crushed to minimize the mass transfer effect. Those authors tried to measure the total amount of gas loss during heating, and then discussed the relationship between the amount of volatile gas and the swelling ratio.…”

Section: Resultsmentioning

confidence: 99%

“…Saito et al reported that the maximum swelling ratio for caking coals increases with the decrease of coal rank or amount of carbon. 14) Low-rank coal contains more volatile matter and inflates more. The porous structure in the coke of low-rank coal showed a smaller number of pores of larger sizes, while that of high-rank coal contained numerous smaller pores.…”

Section: Numerical Investigation Of the Effects Of Gas-release Rate Amentioning

confidence: 99%

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Numerical Investigation of the Effects of Gas-release Rate and Viscosity under Various Heating Rates on Swelling Ratio of Coal in the Coke Production Process

Taki

Hayashizaki

Matsui³

2019

ISIJ Int.

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The effect of heating rate on the swelling ratio of coke during heating of coal was investigated using numerical simulations. The mathematical model in our previous study was modified to observe the effect of the heating rate, and the equation for the reaction rate of coal pyrolysis and gas formation was changed to a first-order temperature-dependent equation. The original and viscosity-dependent classical bubble nucleation equations were compared, and the results showed that the swelling ratio in the numerical simulation results reduced with an increase in the mass transfer rate of gas from coal. At low mass transfer rate (1 × 10 − 13 m 3 /s), the dependence of the swelling ratio on the heating rate was not straightforward. The swelling ratio increased in the order of the following heating rates: 10, 30, and 3°C/min. At high mass transfer rate (1 × 10 − 12 m 3 /s), the swelling ratio increased with increasing heating rate. Experimental results of varying the heating rate agreed well with the results of the large mass transfer case. The numerical simulation results indicated two issues-the gas escaping from coal is a key factor affecting the swelling of coal during heating, and the swelling ratio increased with increasing heating rate because of the short gas release time.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Numerical Investigation Of the Effects Of Gas-release Rate Amentioning

confidence: 99%

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Numerical Investigation of the Effects of Gas-release Rate and Viscosity under Various Heating Rates on Swelling Ratio of Coal in the Coke Production Process

Taki

Hayashizaki

Matsui³

2019

ISIJ Int.

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Regulation of permeability of plastic layer of coking coal by volatiles from coal pyrolysis

Guo¹,

WANG²,

Shen³

et al. 2022

Journal of Fuel Chemistry and Technology

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Numerical Simulation of Swelling Behavior of Coal Particles

et al. 2022

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The swelling of a packed bed of coal during carbonization was numerically investigated. The coal particles were assumed to be spheres capable of swelling. When falling particles of the same size, the height of the packed bed was determined by the particle size, and during swelling of particles of the same size, the height of the packed bed was also determined by the particle size. However, the height of the packed bed with different particle sizes was lower than that of the packed bed with particles of the same size. This was owing to the densifying of the smaller particles between the larger particles. When the swelling ratio of the particles in the differently packed beds was 25%, no difference in dilatation was observed. By fitting the numerical solutions and previous experimental data, the difference in the swelling ratio between the smaller and larger particles was 16.8%.

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Effect of Volatile Matter and Thermoplastic Components on Softening and Swelling Behavior in Carbonization of Coal

Cited by 4 publications

References 15 publications

Numerical Investigation of the Effects of Gas-release Rate and Viscosity under Various Heating Rates on Swelling Ratio of Coal in the Coke Production Process

Numerical Investigation of the Effects of Gas-release Rate and Viscosity under Various Heating Rates on Swelling Ratio of Coal in the Coke Production Process

Regulation of permeability of plastic layer of coking coal by volatiles from coal pyrolysis

Numerical Simulation of Swelling Behavior of Coal Particles

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