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Internal Carbon Cycles in the Steel Industry: Pathways for CO <sub>2</sub> Management and Carbon Capture Utilization

鉄鋼業における内部炭素循環：CO2管理と炭素回収利用の経路 (AI 翻訳)

Florian Haakmann, Nina Kolbe, Julian Suer, Cássia Castro Müller, Nils Jäger

Chemie Ingenieur Technik📚 査読済 / ジャーナル2026-05-21#CCUSOrigin: EU
DOI: 10.1002/cite.70121
原典: https://doi.org/10.1002/cite.70121
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🤖 gxceed AI 要約

日本語

本レビュー論文は、鉄鋼業における内部炭素循環とCCU統合の技術的実現可能性と環境便益を検討。プラント内のガス・エネルギーネットワークの現実に基づき、内部炭素循環をガス流、変換工程、再統合点で構造的に分類し、既存設備への短期導入策と長期概念を区別する実践的分類法を提案する。

English

This review examines the technical feasibility and environmental benefits of internal carbon cycles and CCU integration in the steel industry. It proposes a structured classification of internal carbon cycles by gas stream, conversion step, and reintegration point, distinguishing near-term retrofit options from long-term concepts based on real-world plant gas and energy network constraints.

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（日本製鉄、JFE等）は水素直接還元への移行を進める一方、既存高炉のCO2削減策としてCCUSや炭素循環の導入が急務。本論文の内部炭素循環の分類は、日本の鉄鋼各社が自社プラントに最適な短期対策を選択する上で実践的な枠組みを提供する。

In the global GX context

Global steel decarbonization requires both long-term hydrogen-based routes and transitional strategies for existing assets. This paper provides a practitioner-oriented classification of internal carbon cycles and CCU, filling a gap between high-level CCU reviews and plant-level operational realities, which is relevant for steelmakers worldwide facing similar retrofit decisions.

👥 読者別の含意

🔬研究者:Provides a structured taxonomy of internal carbon cycles that can guide further research on CCU integration in iron and steelmaking.

🏢実務担当者:Offers a decision framework for steel plant operators to identify near-term carbon capture and reuse options within existing gas networks.

🏛政策担当者:Highlights the need to support transitional CCU infrastructure in industrial decarbonization policies alongside hydrogen investments.

📄 Abstract（原文）

ABSTRACT The steel industry contributes approx. 7%–9% to global CO 2 emissions and is therefore among the most emission‐intensive industrial sectors. Although hydrogen (H 2 ) based direct reduction offers a long‐term solution, transitional strategies are essential for existing assets. Internal carbon cycles describe the reuse and conversion of carbon‐containing by‐products within the steel plant and present a promising approach to circular economy. This article examines the mechanisms, technical feasibility, and environmental benefits of internal carbon loops and carbon capture utilization (CCU) integration, supported by recent research and industrial projects such as Carbon2Chem. Despite a growing body of CCU and steel decarbonization reviews, a consolidated discussion that starts from the realities of integrated‐plant gas and energy networks (availability, quality, and operational constraints) and translates them into actionable internal carbon‐cycle options remains limited. Therefore, this review provides an industrial practitioner perspective and proposes a structured classification of internal carbon cycles by gas stream, conversion step, and reintegration point in the steelworks to better distinguish near‐term retrofit pathways from longer‐term concepts.

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