Skip to main content
placeholder image

Energy and economic assessment of blast furnace ironmaking operated under nitrogen free and top gas recycling conditionsronmaking Operated under Nitrogen Free and Top Gas Recycling Conditions

Conference Paper


Abstract


  • Blast furnace ironmaking the major process for new iron production and is likely to remain competitive against alternative ironmaking processes for the coming decades. Further development of blast furnace ironmaking targets decreasing coke consumption and overall CO2 emissions. Nitrogen-free blast and top gas recycling are two potential measures to achieve these purposes. This paper analyses the effects of nitrogen free blast and top gas recycling on the operation of a blast furnace in comparison with a conventional blast furnace. The results show that recycling of top gas consisting of CO and CO2 is an effective measure to control the combustion temperature. However, recycling of top gas will require the combination of an oxyfuel gasifier in which gasification reaction of CO2 and carbon will be carried out and the generated reducing gas heated to 1400 -1700 °C. It not only provides the advantage of utilisation of the reduction capability of the top gas, but also is expected to generate financial benefit by reduction of the operation costs by up to US$5/THM.

Publication Date


  • 2012

Citation


  • Zhang, G. & Pinson, D. (2012). Energy and economic assessment of blast furnace ironmaking operated under nitrogen free and top gas recycling conditionsronmaking Operated under Nitrogen Free and Top Gas Recycling Conditions. Asia Steel International Conference 2012 Beijng, China: Asia Steel International Conference Organisers.

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5181

Abstract


  • Blast furnace ironmaking the major process for new iron production and is likely to remain competitive against alternative ironmaking processes for the coming decades. Further development of blast furnace ironmaking targets decreasing coke consumption and overall CO2 emissions. Nitrogen-free blast and top gas recycling are two potential measures to achieve these purposes. This paper analyses the effects of nitrogen free blast and top gas recycling on the operation of a blast furnace in comparison with a conventional blast furnace. The results show that recycling of top gas consisting of CO and CO2 is an effective measure to control the combustion temperature. However, recycling of top gas will require the combination of an oxyfuel gasifier in which gasification reaction of CO2 and carbon will be carried out and the generated reducing gas heated to 1400 -1700 °C. It not only provides the advantage of utilisation of the reduction capability of the top gas, but also is expected to generate financial benefit by reduction of the operation costs by up to US$5/THM.

Publication Date


  • 2012

Citation


  • Zhang, G. & Pinson, D. (2012). Energy and economic assessment of blast furnace ironmaking operated under nitrogen free and top gas recycling conditionsronmaking Operated under Nitrogen Free and Top Gas Recycling Conditions. Asia Steel International Conference 2012 Beijng, China: Asia Steel International Conference Organisers.

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5181