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Effect of High Temperature on CO 2 Gasification Kinetics of Sub-Bituminous Coal Fly Ash

Author

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  • Tae-Jin Kang

    (Clean Energy Conversion Research Center, Institute for Advanced Engineering, 175-28, Goan-ro 51 beon-gil, Baegam-myen, Cheoin-gu, Yongin-si 17180, Gyeonggi-do, Republic of Korea)

  • Jin-Hee Lee

    (Clean Energy Conversion Research Center, Institute for Advanced Engineering, 175-28, Goan-ro 51 beon-gil, Baegam-myen, Cheoin-gu, Yongin-si 17180, Gyeonggi-do, Republic of Korea)

  • Da-Hye Lee

    (Clean Energy Conversion Research Center, Institute for Advanced Engineering, 175-28, Goan-ro 51 beon-gil, Baegam-myen, Cheoin-gu, Yongin-si 17180, Gyeonggi-do, Republic of Korea)

  • Hyo-Sik Kim

    (Clean Energy Conversion Research Center, Institute for Advanced Engineering, 175-28, Goan-ro 51 beon-gil, Baegam-myen, Cheoin-gu, Yongin-si 17180, Gyeonggi-do, Republic of Korea)

  • Suk-Hwan Kang

    (Clean Energy Conversion Research Center, Institute for Advanced Engineering, 175-28, Goan-ro 51 beon-gil, Baegam-myen, Cheoin-gu, Yongin-si 17180, Gyeonggi-do, Republic of Korea)

Abstract

Gasification is an eco-friendly thermochemical conversion process that can use various raw materials to generate high value-added products. Coal fly ash residue from coal-based thermal power plants must be effectively managed and utilized. Therefore, this study investigates the effects of high temperatures (1100–1300 °C) on the gasification kinetics of two types of coal fly ash (KPU and LG) under isothermal CO 2 balance using a thermo-balance reactor. Three models were applied to study the reactivity of the coal fly ashes: the shrinking core model (SCM), the volume reaction model (VRM), and the random pore model (RPM). The results showed that among the three models, the SCM-based simulation was the most similar to the experimental data. We determined that low activation energy and a high pre-exponential factor achieve high gasification reactivity. With the SCM, the activation energy values for the CO 2 gasification of the KPU and LG coal fly ashes were 52.7 and 59.6 kJ/mol, respectively, and their pre-exponential factors were 1.90 × 10 2 and 6.51 × 10 2 , respectively. Moreover, the high reactivity of the two fly ashes was attributed to the high reaction temperature and presence of moisture and volatile matter.

Suggested Citation

  • Tae-Jin Kang & Jin-Hee Lee & Da-Hye Lee & Hyo-Sik Kim & Suk-Hwan Kang, 2025. "Effect of High Temperature on CO 2 Gasification Kinetics of Sub-Bituminous Coal Fly Ash," Sustainability, MDPI, vol. 17(4), pages 1-17, February.
    • Handle: RePEc:gam:jsusta:v:17:y:2025:i:4:p:1519-:d:1589504
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