Influence of Additive Amount and Heating Conditions on the Strength of Coke Prepared from Non-Caking Coal

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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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  • 非粘結炭から調製したコークスの強度に及ぼす粘結剤添加と加熱条件の影響
  • ヒネンケツタン カラ チョウセイ シタ コークス ノ キョウド ニ オヨボス ネンケツザイ テンカ ト カネツ ジョウケン ノ エイキョウ

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Abstract

<p>In the present study, we prepare several types of specimens from non-caking coal – including specimens 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, as well as specimens consisting of physical blends with HPC – and examine the influence of heating conditions and types of caking agents on the production of high-strength coke using a SUS tube. We also investigate the influence of heating conditions and types of caking agents on the strength of coke from pelleted specimens and determine the optimal conditions for producing high-strength coke from non-caking coal. HPC with a wide range of thermoplastic properties is more effective as caking agents than additives containing only low-molecular-weight or high-molecular-weight components. In addition, the strength of the produced coke depends on the amount of the additive, and optimal values of the additive amount are present. It was found that the following heating schedule is effective for producing high-strength coke from non-caking coal with added caking agents: First, high-speed heating (20ºC/min) to an intermediate temperature in the range 400-600ºC, recognized as the thermoplastic temperature range for typical caking coal; then, low-speed heating (3ºC/min) to the temperature range of 900-1000ºC. Moreover, we demonstrate that, by increasing the rate of heating in the thermoplastic temperature range, it is possible to reduce the amount of caking agent added.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 107 (1), 35-43, 2021

    The Iron and Steel Institute of Japan

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