Energy and Economic Assessment of Blast Furnace Ironmaking Operated under Nitrogen Free and Top Gas Recycling Conditions
作者单位：BlueScope Steel ResearchBlueScope Steel Ltd.Australia
会议名称：《Asia Steel International Conference 2012(Asia Steel 2012)》
会议日期：2012年
学科分类：080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程]
关 键 词：blast furnace ironmaking pure oxygen blast,top gas recycling,oxyfuel gasifier
摘 要：Blast furnace ironmaking is the major route for iron production and likely to remain competitive against alternative ironmaking processes for the coming decades.Further blast furnace development targets decreasing coke consumption and overall CO emissions and 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 CO is an effective measure to control the raceway combustion temperature.However,recycling of top gas will require the combination of an oxyfuel gasifier in which gasification of carbon by CO will occur and the generated reducing gas heated to 1400 -1700℃.It not only utilises the reduction capability of the top gas,but also is expected to reduce operating costs by up to US$5/THM.