Green Hydrogen Based Direct Reduction for Low Carbon Steelmaking
Rechberger K, Spanlang A, Conde AS, Wolfmeir H, Harris C
Steel Research International
The European steel industry aims at a CO2 reduction of 80-95% by 2050 ensuring that Europe will meet the requirements of the Paris Agreement. As the reduction potentials of the current steelmaking routes are low the transfer toward breakthrough technologies is essential to reach these goals. Hydrogen based steelmaking is one approach to realize CO2 lean steelmaking. Therefore, the natural gas (NG) based direct reduction (DR) acts as a basis for the first step of this transition. The high flexibility of this route allows the gradual addition of hydrogen and, in a long term view, runs the process with pure hydrogen. Model based calculations are performed to assess the possibilities for injecting hydrogen. Therefore, NG and hydrogenbased DR models are developed to create new process know how and enable an evaluation of these processes in terms of energy demand, CO2 reduction potentials, and so on. The examinations show that the hydrogen based route offers a huge potential for green steelmaking which is strongly depending on the carbon footprint of the electricity used for the production of hydrogen.