Influence of Heating Conditions on the Strength of Coke Produced from Slightly-Caking Coal Containing Chemically-Loaded Thermoplastic Components

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  • Tsubouchi Naoto
    Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University
  • Naganuma Ryo
    Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University
  • Mochizuki Yuuki
    Center for Advanced Research of Energy and Materials, Faculty of Engineering, Hokkaido University
  • Hayashizaki Hideyuki
    Process Research Laboratories, Nippon Steel Corporation
  • Shishido Takahiro
    Coal & Energy Project Dept., Technical Development Group, Kobe Steel, Ltd.

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Other Title
  • 軟化溶融成分を化学的に担持した劣質炭からのコークス強度に及ぼす加熱条件の影響
  • ナンカ ヨウユウ セイブン オ カガクテキ ニ タンジシタ レツシツタン カラ ノ コークス キョウド ニ オヨボス カネツ ジョウケン ノ エイキョウ

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<p>In this work, we studies the production of higher-strength coke from chemically-loaded coal in which noncovalent-bonds between O-functional groups in coal are cleaved by pyridine and HPC-derived thermoplastic components are introduced into the pores produced by swelling. The effect of heating rate up to thermoplasticity temperatures of coal on coke strength is first investigated. To examine synergistic effects due to further fluidity enhancements caused by the increased proximity of coal to thermoplastic components during carbonization, the influence of heating rate on coke-strength prepared from pelleted-coal also examined, as described above, to clarify the optimal heating conditions for yielding high-strength coke from slightly-caking coal. An investigation of the use of a SUS-tube to produce high-strength coke from slightly-caking coal with chemically-loaded HPC pyridine-soluble components reveals that high-strength coke may be obtained by 20ºC/min to 400ºC and then continuing to heat at 3ºC/min to 1000ºC. On the other hand, when producing coke from formed specimens consisting of slightly-caking coal with chemically-loaded HPC pyridine-soluble components, we exhibit that, by heating first at 20ºC/min to 500-600ºC and then heating at 3ºC/min to 900ºC, it is possible to produce coke whose strength rivals that of coke produced by carbonization at 3ºC/min of strongly-caking coal. In addition, in producing high-strength coke from formed slightly-caking coal, an optimal amount of additive is present for all types of additive considered – HPC physical blend, chemically-loaded pyridine-soluble HPC and physical blend of pyridine-insoluble HPC components – and, with chemically-loaded pyridine-soluble HPC, it is possible to prepare particularly high-strength coke.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 107 (1), 24-34, 2021

    The Iron and Steel Institute of Japan

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