Contribution Oral Presentation
Hydrogen based direct reduction for CO2-lean steelmaking
The iron and steel industry accounts for approximately 30 % of the global industrial CO2-emissions. As the reduction potentials of the current steelmaking routes are rather low, the transfer towards breakthrough-technologies is essential to reach the goals of the Paris Agreement which means a reduction of CO2 by 80 %. The hydrogen-based direct reduction (DR) is one of different approaches to realize a CO2-lean steelmaking process. Therefore, the state-of-the-art natural gas based direct reduction acts as a basis for the first step of this transition. This process is already operated with a syngas containing CO and H2 produced out of the natural gas. The high flexibility of the DR-route allows the gradual substitution of natural gas by hydrogen and, in a long-term view, running the process with pure hydrogen. The aim of this work is to point out the possibilities for injecting hydrogen in the direct reduction process and to compare the natural gas based with the hydrogen based steelmaking route in terms of energy demand, CO2-reduction potentials, changes in process conditions etc. As the availability of sufficient amounts of renewable energy to produce green hydrogen will play a dominant role for the decarbonization of the steel industry, the suitability and requirements of the integration of hydrogen generation into industrial systems are presented.