Can Hydrogen Decarbonize Steel? Insights from Energy and Efficiency Analysis

What is it about?

This paper analyses a hydrogen-based route for producing steel (H₂-DRI-EAF) using an integrated assessment of energy use, exergy (efficiency), and carbon emissions. It models the full process - from hydrogen production by electrolysis to iron reduction and steelmaking - using a realistic industrial configuration (87% scrap, 13% primary iron). The study quantifies: how much electricity is required, where energy is lost or degraded (exergy analysis) and the resulting emissions under different electricity scenarios. It also identifies the main bottlenecks in the system, especially hydrogen production and heat losses.

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Photo by prachak ananta on Unsplash

Photo by prachak ananta on Unsplash

Why is it important?

Steel production is a major source of global emissions, and this paper shows that hydrogen-based steelmaking can reduce emissions by more than 94% compared to conventional routes. It reveals that: (1) the system can achieve high overall resource efficiency (~78%), much higher than conventional steelmaking, (2) the electrolyzer is the main limitation, with large energy losses and (3) the success of this transition depends strongly on renewable electricity availability. In short, the paper provides critical evidence for designing realistic low-carbon steel pathways, highlighting both the potential and the key challenges that must be solved for large-scale deployment.