Techno-Economic Evaluation of Different Scenarios for Carbon Capture and Utilization Concepts for Steel Mill Off-Gases

Conventional steel production with high CO 2 emissions ▪ 2/3 of German steel production with blast furnace route 1) ▪ Coal as energy carrier ▪ Off-gases with different amounts and concentrations ▪ Gases: COG, BFG and BOFG ▪ Containing: CO, CO 2 , H 2 , N 2 , CH 4 … ▪ Off-gas utilization today (reference state) ▪ Combusted in on-site CHPs ▪ Electricity, steam, low-temperature heat →Subsequently all CO 2 is emitted 09/02/2024 © Fraunhofer 2 → Leads to 7% of CO 2-emissions in Germany (~50 Mt CO2 /a) 2)