Comprehensive evaluation and potential of CO2 emissions for the blast furnace converter route

This study deals with the comprehensive evaluation of the CO2 emissions of steelmaking using the blast furnace - oxygen converter route considering al so all pre-production steps from raw materials on. Due to the existing publ ications this production route emits 1800 to 2100 kg CO2/t crude steel. Wit h the aim to review these data the CO2 emissions were calculated by conside ring the material flows as well as the utilized coupling products and recov ered waste heats by a comprehensive evaluation. For this calculation, opera tional data of modern plants which are low in consumption figures were used exclusively. Only those integrated iron and steel works were taken into co nsideration which operate a coke oven and sinter plant. Considering credits for coupling products and recovered waste heat the net CO2 emissions are i n the average range of 1480 kg/t crude steel. Further existing potentials t o decrease CO2 emissions are discussed in this report. Existing potentials apart, a lot of developing efforts will be necessary for further potentials not being in industrial use.