Decarbonising the steel industry is among the ultimate climate challenges. This study analyzes how the cost optimal mix of technologies to meet the demand of a green-steel manufacturing process using direct reduction with hydrogen and electric arc furnace (HDR-EAF) changes under progressively lower CO2 emission limits. The modellization was done thanks to the PyPSA framework and includes renewable generators, different hydrogen production techniques and burners technologies, as well as a carbon capture system. It is shown that a big reduction in CO2 emission is possible with a little increase in CO2 price and a totally green production of steel can be achieved.
Keywords green steel, direct hydrogen reduction, renewable energy resources