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Openai/69450ad3-81f4-8007-992c-942fcfa3c3e8
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==== ### ==== CO は自然に存在しない。 * コークス製造(石炭乾留) * C + O₂ → CO₂(発熱) * CO₂ + C → 2CO(吸熱) 👉 COは高炉の中で大量の炭素エネルギーを使って作っている しかも、 * CO₂発生 * 排ガス損失 * 高炉全体を1400℃以上に保つ熱需要 を含めると、系全体では極めてエネルギー浪費的。 ===== H₂も自然には存在しないが、 ===== * 再エネ電力 → 電解 → H₂ * 直接還元(DRI) * 電炉で溶解 と工程分離が可能。 理論的には、 * 還元反応は吸熱でも * 電力 → 化学エネルギー → 還元 というエクセルギー効率の高い経路を取れる。
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