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<p>Semi-coke prepared by pyrolyzing low-rank coal can be a potential fuel for utilization in blast furnaces (BFs). To investigate the effects of coal properties and pyrolysis conditions on semi-coke characteristics, the properties and structures of low ash-content coal from 20 coal mines in <i>Shenfu</i> coalfield and the semi-coke produced from it were studied. The composition, tar yield, and thermal stability of the coals showed clear differences. Pyrolysis rates are mainly affected by the total hydrogen and oxygen contents of coals. The pyrolysis temperature appropriate for preparing high-performance semi-coke was determined to be close to the initiation of polycondensation reaction. At this temperature, sufficient tar can be obtained, the semi-coke has an appropriate volatile content, well-developed pore structure, and disordered microcrystalline structure. The main factors affecting the combustion reactivity of semi-coke are the C/O ratio of coal and volatile content in semi-coke. A prediction formula of the calorific value of semi-coke is proposed based on the composition of coal and semi-coke. Semi-coke with good combustion reactivity, high calorific value, and stable performance can be produced by controlling pyrolysis conditions. The application of pyrolyzed semi-coke in a BF to replace anthracite for injection showed that BF operation was optimized, and fuel consumption was reduced.</p>

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Investigating the Potential of Preparing Semi-coke by Upgrading Various Low Ash Bituminous Coal in Shenfu Coalfield for Blast Furnace Injection

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Jiangyong He,
  • Chong Zou,
  • Nan Yu,
  • Dong Liang,
  • Junxue Zhao,
  • Shiwei Liu,
  • Mengmeng Ren

摘要

Semi-coke prepared by pyrolyzing low-rank coal can be a potential fuel for utilization in blast furnaces (BFs). To investigate the effects of coal properties and pyrolysis conditions on semi-coke characteristics, the properties and structures of low ash-content coal from 20 coal mines in Shenfu coalfield and the semi-coke produced from it were studied. The composition, tar yield, and thermal stability of the coals showed clear differences. Pyrolysis rates are mainly affected by the total hydrogen and oxygen contents of coals. The pyrolysis temperature appropriate for preparing high-performance semi-coke was determined to be close to the initiation of polycondensation reaction. At this temperature, sufficient tar can be obtained, the semi-coke has an appropriate volatile content, well-developed pore structure, and disordered microcrystalline structure. The main factors affecting the combustion reactivity of semi-coke are the C/O ratio of coal and volatile content in semi-coke. A prediction formula of the calorific value of semi-coke is proposed based on the composition of coal and semi-coke. Semi-coke with good combustion reactivity, high calorific value, and stable performance can be produced by controlling pyrolysis conditions. The application of pyrolyzed semi-coke in a BF to replace anthracite for injection showed that BF operation was optimized, and fuel consumption was reduced.