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Reducing net CO2 emissions using charcoal as a blast furnace tuyere injectant

Journal Article


Abstract


  • The replacement of coal-based fuels by renewable fuels such as charcoal is an attractive way to reduce

    net greenhouse gas emissions from the integrated steelmaking route. Our previous studies have indicated

    that the potential for savings in net CO2 emissions ranges from 32 to 58 percent, with use as a BF tuyere

    injectant being the largest application. The current study considered the combustibility of four types of

    charcoal in comparison with PCI coal under simulated BF raceway conditions. The major findings were

    that burnouts under standard conditions (air-cooled coaxial lance, O/C = 2.0) were comparable or better

    than that of the high volatile matter PCI coal studied, and a comparison with the trend line for burnout

    with injectant volatile matter previously established for coals, indicated that the hardwood charcoals studied

    had burnouts 40% (abs) higher than those of equivalent coals, and the softwood charcoal studied was

    higher again. A study of the effects of oxygen enrichment indicated that small increases were effective,

    and particularly so for the least combustible charcoal. Overall, the burnout results indicated that higherthan-

    coal injection rates should be possible in industrial practice, and in combination with the previous

    heat and mass balance results, they indicated the potential for increased BF productivity. The brief study

    of the combustion of coal-charcoal mixtures indicated good combustibility and predictable burnouts. The

    microscopic examination of both the charcoal injectants and their combustion chars indicated that there

    was significant fragmentation of the charcoals during combustion, boosting their already high surface

    areas and combustibility.

UOW Authors


  •   Somerville, Michael A. (external author)
  •   Mathieson, John G. (external author)
  •   Jahanshahi, Sharif (external author)
  •   Rogers, Harold P. (external author)

Publication Date


  • 2012

Citation


  • Mathieson, J. G., Rogers, H., Somerville, M. A. & Jahanshahi, S. (2012). Reducing net CO2 emissions using charcoal as a blast furnace tuyere injectant. ISIJ International, 52 (8), 1489-1496.

Scopus Eid


  • 2-s2.0-84865350124

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3751

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 1489

End Page


  • 1496

Volume


  • 52

Issue


  • 8

Abstract


  • The replacement of coal-based fuels by renewable fuels such as charcoal is an attractive way to reduce

    net greenhouse gas emissions from the integrated steelmaking route. Our previous studies have indicated

    that the potential for savings in net CO2 emissions ranges from 32 to 58 percent, with use as a BF tuyere

    injectant being the largest application. The current study considered the combustibility of four types of

    charcoal in comparison with PCI coal under simulated BF raceway conditions. The major findings were

    that burnouts under standard conditions (air-cooled coaxial lance, O/C = 2.0) were comparable or better

    than that of the high volatile matter PCI coal studied, and a comparison with the trend line for burnout

    with injectant volatile matter previously established for coals, indicated that the hardwood charcoals studied

    had burnouts 40% (abs) higher than those of equivalent coals, and the softwood charcoal studied was

    higher again. A study of the effects of oxygen enrichment indicated that small increases were effective,

    and particularly so for the least combustible charcoal. Overall, the burnout results indicated that higherthan-

    coal injection rates should be possible in industrial practice, and in combination with the previous

    heat and mass balance results, they indicated the potential for increased BF productivity. The brief study

    of the combustion of coal-charcoal mixtures indicated good combustibility and predictable burnouts. The

    microscopic examination of both the charcoal injectants and their combustion chars indicated that there

    was significant fragmentation of the charcoals during combustion, boosting their already high surface

    areas and combustibility.

UOW Authors


  •   Somerville, Michael A. (external author)
  •   Mathieson, John G. (external author)
  •   Jahanshahi, Sharif (external author)
  •   Rogers, Harold P. (external author)

Publication Date


  • 2012

Citation


  • Mathieson, J. G., Rogers, H., Somerville, M. A. & Jahanshahi, S. (2012). Reducing net CO2 emissions using charcoal as a blast furnace tuyere injectant. ISIJ International, 52 (8), 1489-1496.

Scopus Eid


  • 2-s2.0-84865350124

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3751

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 1489

End Page


  • 1496

Volume


  • 52

Issue


  • 8