低炭素鉄鋼冶金の基盤技術：研究進展と今後の方向性
Key Technologies for Low-Carbon Iron and Steel Metallurgy: Research Progress and Future Directions (原題)
Yi Liu, Jialu Hong, Pin Shao
🤖 gxceed AI 要約
日本語
鉄鋼は高温熱供給・還元・溶解が石炭・コークスと強く結合し脱炭素が困難である。本レビューは水素富化高炉、トップガス循環、水素直接還元（シャフト炉・流動床）、DRI-EAF/ESF、電気化学製鉄、水素プラズマ、CCUSの主要反応と工学的限界を整理する。水素還元・電気化学は深脱炭素の潜在力を持つが、その優位性は低炭素水素・電力炭素強度・鉱石品質・下流溶解経路に依存する。既存BF-BOFには水素富化・トップガス循環・CCUSが即効的だが限定的な選択肢となる。今後の比較は鉱石調整から資源循環までの一貫境界で行うべきと提言する。
English
Steel decarbonization is hard because heat, reduction and melting remain coupled to coal and coke. This review maps key reactions and engineering limits of low-carbon ironmaking: hydrogen-enriched blast furnaces with top-gas recycling, hydrogen direct reduction (shaft/fluidized bed), DRI-EAF/ESF, electrochemical ironmaking, hydrogen plasma and CCUS. Hydrogen and electrochemical routes offer deep decarbonization potential, but system-level advantage depends on low-carbon hydrogen, grid carbon intensity, ore quality and downstream melting. For existing BF-BOF fleets, hydrogen enrichment, top-gas recycling and CCUS are more immediate but bounded. It calls for consistent whole-chain comparison boundaries.
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Scope1排出の大宗を占め、水素還元製鉄（COURSE50/ Super-COURSE）やグリーンスチール市場形成がGX政策の焦点。本レビューは技術境界と評価手法の整合性を論じ、SSBJ/Scope3開示やトランジション・ファイナンスにおける鉄鋼セクターの削減経路・投資判断の基礎資料となる。
In the global GX context
Steel is a hard-to-abate sector central to ISSB/CSRD Scope 1-3 disclosure and transition finance. This review's emphasis on consistent whole-chain accounting boundaries—spanning ore prep, energy, reduction, melting and recycling—directly informs how steelmakers should report direct/indirect emissions and feedstock adaptability under global disclosure frameworks.
👥 読者別の含意
🔬研究者:水素還元・電気化学・CCUS各経路の工学的制約と評価境界の整理として、脱炭素経路比較研究の出発点になる。
🏢実務担当者:自社の削減ロードマップ策定やScope1/3算定境界の設計、水素・CCUS投資判断の技術的前提を確認できる。
🏛政策担当者:鉄鋼脱炭素支援策（水素供給・CCSインフラ・グリーン鋼基準）設計の際、技術的制約と評価整合性の論点を提供する。
📄 Abstract（原文）
Steel production remains difficult to decarbonize because high-temperature heat supply, iron-oxide reduction and melting are still closely coupled to coke, coal and natural gas. With the blast furnace-basic oxygen furnace (BF-BOF) route continuing to dominate global output, the transition requires more than substitution of a single fuel; reductants, heat sources, metallic feedstocks and energy supply must be reconfigured together. Here we review the key reactions and engineering boundaries of low-carbon iron and steel metallurgy, including hydrogen-enriched blast furnaces with top-gas recycling, hydrogen-based direct reduction in shaft furnaces and fluidized beds, DRI-EAF and DRI-ESF routes, electrochemical ironmaking, hydrogen plasma metallurgy, and carbon capture, utilization and storage (CCUS). Particular attention is given to temperature-dependent phase transformations, gas-solid mass transfer and pellet sticking during hydrogen reduction; defluidization in fine-ore fluidized beds; downstream melting of high-gangue DRI; residual elements in EAF feedstocks and carbonaceous-material consumption during slag foaming; and the energy penalties and accounting boundaries associated with CO₂ capture. Hydrogen-based direct reduction and electrochemical routes offer substantial potential for deep decarbonization, but their system-level advantage depends on low-carbon hydrogen, electricity carbon intensity, ore quality and the downstream melting route. For the existing BF-BOF fleet, hydrogen enrichment, top-gas recycling and CCUS provide more immediate, although inherently bounded, mitigation options. Future comparisons should use consistent whole-chain boundaries spanning ore preparation, energy supply, reduction, melting and resource circulation, and should report direct and indirect emissions, energy demand, feedstock adaptability and product quality on the same basis.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.30560/ijas.v9n3p20first seen 2026-09-17 04:49:51
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