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High-Strength Formed Coke from Torrefied Biomass and Its Blend with Noncaking Coal
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    High-Strength Formed Coke from Torrefied Biomass and Its Blend with Noncaking Coal
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    • Aditya Wibawa
      Aditya Wibawa
      Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, Japan
    • U.P.M. Ashik
      U.P.M. Ashik
      Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, Japan
      More by U.P.M. Ashik
    • Shinji Kudo
      Shinji Kudo
      Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, Japan
      Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, Japan
      More by Shinji Kudo
    • Shusaku Asano
      Shusaku Asano
      Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, Japan
    • Xiangpeng Gao
      Xiangpeng Gao
      Centre for Water, Energy and Waste, Harry Butler Institute, Murdoch University, 90 South Street, Murdoch 6150, Western Australia, Australia
    • Jun-ichiro Hayashi*
      Jun-ichiro Hayashi
      Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, Japan
      Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, Japan
      Research and Education Center of Green Technologies, Kyushu University, 6-1 Kasuga Koen, Kasuga 816-0823, Japan
      *Email: [email protected]. Phone: +81 92 583 7796.
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    Energy & Fuels

    Cite this: Energy Fuels 2022, 36, 16, 9121–9132
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    https://doi.org/10.1021/acs.energyfuels.2c01722
    Published August 5, 2022
    Copyright © 2022 American Chemical Society

    Abstract

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    In continuation of our previous study on production of high-strength metallurgical coke from torrefied softwood (cedar), we studied coke production from a mixture of torrefied cedar (TC) and noncaking coal by pulverization to sizes <100 μm, mixing, binderless hot briquetting, and carbonization. These sequential processes produced coke with a tensile strength of 5–17 MPa, which was equivalent to or greater than that of conventional coke (5–6 MPa), from TC-coal mixtures over the entire ranges of TC mass fraction in briquette of 0–100%, torrefaction temperature of 250–300 °C, and choice of coal (sub-bituminous or medium-volatile bituminous coal). The mixing of TC and coal hindered densification of coke due to hindrance of shrinkage of more-shrinkable TC-derived particles during the carbonization under many of the conditions. Nevertheless, positive synergy occurred in the coke strength at TC mass fractions of over 50%, where coal-derived particles were dispersed in the matrix of TC-derived particles, bonded to them during the carbonization, and behaved as a reinforcement of the matrix. The bonding between TC-derived and coal-derived primary particles was revealed by scanning electron microscopy. Copulverization of mixed TC and coal to sizes <40 μm before the briquetting gave cokes having strengths as high as 23–28 MPa. The fine pulverization increased the frequencies of mutual bonding of TC-derived particles and coal-derived particles and bonding between TC-derived and coal-derived particles per coke volume. The strength of coke from the TC-coal mixture generally followed volume-based additivity of strengths of cokes from TC and coal. This was realized by mixing primary particles of TC and coal within ≈10 μm scale or even smaller.

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.energyfuels.2c01722.

    • Literature review of previous studies on coke production from single coal or coal blend with addition of biomass; reproducibility of tensile strength of cokes from different feedstocks and relationships between fBm,TC and fBV,TC and between fBm,TC and fCV,TC; particle size distributions for CA, CB, and CA_BM; measured and calculated ρB and St,B of briquettes from TC, CB, and their mixtures as a function of fBV,TC; stress–displacement profiles for briquettes of TC275, CA, TC275-CA mixtures, TC275_BM, CA_BM, and TC275-CA_BM mixtures; comparison of St,B for briquettes of TC–CA and TC–CA_BM; relationship between volumetric shrinkage of briquette in carbonization and normalized mass release; difference in measured and calculated apparent density of coke as a function of the shrinking rate between TC and CA or between TC_BM and CA_BM; measured and calculated ρC and St,C of cokes from briquettes of TC, CB, and their mixtures as functions of fCV,TC; relationship between stress and displacement normalized by the diameter of a pellet; polished fracture surfaces of coke from TC250-CA; polished fracture surfaces of coke from TC275-CA; and polished fracture surfaces of coke from TC300–CA (PDF)

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    This article is cited by 8 publications.

    1. Shogo Okida, Hirotsugu Dohi, Shinji Kudo, Shohei Wada, Takahiro Shishido, Noriyuki Okuyama, Shusaku Asano, Jun-ichiro Hayashi. Enhancing the Strength of Formed Coke from Woody Biomass with the Addition of Biomass Extracts. Energy & Fuels 2024, 38 (17) , 16532-16542. https://doi.org/10.1021/acs.energyfuels.4c02892
    2. VICTOR DE OLIVEIRA CARVALHO, WANDERSON RIBEIRO DOS SANTOS, CRISTIANO DE OLIVEIRA NEVILLE, CLAUDIO ROCHA LOPES. USO DE CARVÃO PCI COMO SUBSTITUIÇÃO PARCIAL NA MISTURA DE CARVÃO E COMPARAÇÃO DE QUALIDADE DE COQUE EM ESCALA PILOTO E ESCALA INDUSTRIAL. 2024, 525-537. https://doi.org/10.5151/2594-4711-41327
    3. Lodewicus van der Westhuizen, Daneal C.S. Rorke, Johann F. Görgens. Exploring the Impact of Steam Explosion Pretreatment on the Binding Characteristics of Coal-Biomass Briquettes: A Study on Lignocellulose Type and Fibre Morphology. Waste and Biomass Valorization 2024, 3 https://doi.org/10.1007/s12649-024-02647-5
    4. Yoshiya Matsukawa, Yusuke Nakamura, Daisuke Igawa, Takashi Matsui, Hideyuki Aoki. Three-Dimensional Evaluation of Internal Structure of Coke Made by Blending Non-coking Coal Using X-ray Computed Tomography. ISIJ International 2024, 64 (9) , 1367-1375. https://doi.org/10.2355/isijinternational.ISIJINT-2024-027
    5. Yoshiya Matsukawa, Yusuke Nakamura, Yui Numazawa, Daisuke Igawa, Takashi Matsui, Hideyuki Aoki. Migration of inert materials during coking of molded coal. Chemical Engineering Journal Advances 2023, 16 , 100526. https://doi.org/10.1016/j.ceja.2023.100526
    6. Naoto Tsubouchi, Yuuki Mochizuki, Yuting Wang, Saori Konno, Takahiro Shishido. Production of High-Strength Coke by Pressurization Carbonization of Modified-Biomass Blended Coal. ISIJ International 2023, 63 (9) , 1526-1533. https://doi.org/10.2355/isijinternational.ISIJINT-2022-511
    7. Yoshiya Matsukawa, Wakana Hirayama, Jun-ichiro Hayashi, Hideyuki Aoki, Takashi Matsui. Experimental Investigation of Expansion during Formation Process of Formed Coke Blending with Torrefied Biomass. ISIJ International 2023, 63 (9) , 1557-1566. https://doi.org/10.2355/isijinternational.ISIJINT-2022-532
    8. Aditya Wibawa, U. P. M. Ashik, Shinji Kudo, Shusaku Asano, Yusuke Dohi, Tetsuya Yamamoto, Jun-ichiro Hayashi. Control of Reactivity of Formed Coke from Torrefied Biomass by Its Washing with Torrefaction-derived Acidic Water. ISIJ International 2023, 63 (9) , 1545-1556. https://doi.org/10.2355/isijinternational.ISIJINT-2022-537

    Energy & Fuels

    Cite this: Energy Fuels 2022, 36, 16, 9121–9132
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.energyfuels.2c01722
    Published August 5, 2022
    Copyright © 2022 American Chemical Society

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