Climate Change and Emission Reduction Pathways for a Large Capacity Coal-Based Steel Sector: Implementation Issues

摘要

Following the international climate change policy and the major use of coal-based blast furnace-basic oxygen furnace (BF-BOF) in the steel sector, with an average emission of 2.0 t CO2/t steel, alternative processing routes must be considered to reduce the emission intensities. An approach of progressive amalgamation with alternative gas and renewable energy-based processes is indicated for a coal-based sector. The approach also retains coal use for major production with technology changes like smelting reduction technology, HISARNA with carbon capture and storage, or top gas recycling blast furnace. Combining renewable energy-based 'green electrolytic hydrogen' processes with/without natural gas with existing coal-based processing is an important option in achieving global climate change targets for emission reduction. Capacity limitations of alternative processing routes and high green hydrogen costs are hurdles to overcome in progressive amalgamation. An approach to redesigning mixed circuits for minimizing sectoral emissions involving BF-BOF with available scrap is presented.