Impact of Scrap and Hydrogen-Based Direct Reduced Iron Ratios on Energy Demand, Emissions, and Oxygen Management in Green Steelmaking
グリーン製鋼におけるスクラップと水素ベース直接還元鉄比率がエネルギー需要、排出、酸素管理に与える影響 (AI 翻訳)
Eckl F, Moita A, Sousa T, Neto RC
🤖 gxceed AI 要約
日本語
鉄鋼生産の脱炭素化に向け、電炉と水素直接還元鉄（H₂-DRI）を組み合わせたプロセスについて、スクラップとH₂-DRIの比率が電力需要、CO₂排出、スラグ生成、酸素管理に与える影響を詳細な物質・エネルギーバランスモデルで解析。0〜100%の比率で評価し、電力需要は最大13.9 GJ/t鋼まで増加、再生可能電力で最大95%削減可能。副生酸素は約10〜13%のH₂-DRIで需要を満たす。
English
This study develops a detailed bottom-up mass and energy balance model to analyze how the ratio of scrap to hydrogen-based direct reduced iron (H₂-DRI) in electric arc furnace steelmaking affects electricity demand, CO2 emissions, slag formation, and oxygen management. Results show electricity demand increases from 1.1 to 13.9 GJ/tSteel as the H₂-DRI share rises, with emissions reductions up to 95% under renewable electricity. Electrolytic oxygen can fully cover process demand at ~10-13% H₂-DRI.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本の鉄鋼業はCO₂排出の約15%を占め、水素還元や電炉シフトが検討されている。本論文はH₂-DRI比率の定量評価を提供し、電力源の脱炭素化と酸素有効利用の重要性を示唆。国内のグリーンスチール戦略やNEDOプロジェクトへの示唆となる。
In the global GX context
This paper provides a rigorous bottom-up assessment of green steelmaking via hydrogen-based DRI and EAF, relevant to global steel decarbonization efforts. It highlights the critical dependence on clean electricity and the potential for system integration through electrolytic oxygen, informing ISSB-aligned disclosure of transition plans and technology pathways.
👥 読者別の含意
🔬研究者:Provides a detailed process model for hydrogen-based steelmaking that can be used for life-cycle assessment and technology comparison.
🏢実務担当者:Quantifies electricity and hydrogen demand for different DRI/scrap ratios, aiding investment decisions in green steel production.
🏛政策担当者:Shows that full decarbonization requires both hydrogen and renewable electricity, with emissions reduction potential up to 95%.
📄 Abstract（原文）
Steel production contributes significantly to global emissions, making its decarbonization essential. Electrified steelmaking based on electric arc furnaces (EAF) using hydrogen-based direct reduced iron (H₂-DRI) and scrap is a promising pathway. This study analyzes how the H₂-DRI:scrap ratio affects electricity demand, CO₂ emissions, slag formation, and oxygen management. To address limitations of approaches based on aggregated data and linear scaling assumptions, a detailed bottom-up mass and energy balance model is developed, explicitly resolving process interactions between electrolysis, direct reduction, and EAF steelmaking. Eight H₂-DRI:scrap ratios ranging from 0:100 to 100:0 are evaluated. Electricity demand increases from 1.1 GJ/tSteel (0.31 MWh/tSteel) for scrap-based operation to 13.9 GJ/tSteel (3.86 MWh/tSteel) for fully H₂-based production, largely driven by hydrogen generation. Consequently, emissions strongly depend on electricity carbon intensity, with reductions of up to 95% under renewable supply. Electrolytic oxygen can fully cover process demand at ~10–13% H₂-DRI, enabling system integration benefits.
🔗 Provenance — このレコードを発見したソース
- Research Square https://doi.org/10.20944/preprints202607.0178.v1first seen 2026-07-10 04:41:03
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