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炭素循環型スマート製鉄(iACRES)への高温ガス炉の適用性評価

Process evaluation of use of HTGRs to the ironmaking system based on active carbon recycling energy system (iACRES)

林 健太郎*; 栗原 孝平*; 中垣 隆雄*; 笠原 清司  ; Yan, X. ; 稲垣 嘉之; 小川 益郎

Hayashi, Kentaro*; Kurihara, Kohei*; Nakagaki, Takao*; Kasahara, Seiji; Yan, X.; Inagaki, Yoshiyuki; Ogawa, Masuro

プロセスフロー計算による物質収支解析により、高炉から排出されるCO$$_{2}$$をCOに再生してリサイクルする炭素循環型スマート製鉄(iACRES)への高温ガス炉の適用性評価を行った。CO再生法として、CO$$_{2}$$電解と、ISプロセスで製造したH$$_{2}$$との逆シフト反応(RWGS)によるCO$$_{2}$$還元を検討した。CO$$_{2}$$還元プロセスでは、RWGS反応平衡を保つために化学量論比よりも多量のH$$_{2}$$を製造する必要があり、主としてそのために高炉1基当たりのHTGR数が多くなった。RWGSで消費されなかったH$$_{2}$$が高炉に吹き込まれて鉄鉱石還元に使われるため、CO$$_{2}$$還元プロセスの方が単位溶銑製造量あたりのCO$$_{2}$$排出削減幅が大きくなるものの、HTGR1基当たり排出削減量ではCO$$_{2}$$電解プロセスが上回った。

Process evaluation of use of high temperature gas-cooled reactors (HTGRs) to the ironmaking system based on active carbon recycling energy system (iACRES), where CO is recycled by reduction of CO$$_{2}$$ from blast furnaces (BFs), was carried out by heat and material flow analysis. The investigated CO recovery methods were CO$$_{2}$$ electrolysis and CO$$_{2}$$ reduction in reverse water gas shift reaction (RWGS) using H$$_{2}$$ made in the IS process. HTGR number per BF was large in the CO$$_{2}$$ reduction process because more H$$_{2}$$ than stoichiometric amonut was required to keep RWGS equilibrium. More CO$$_{2}$$ reduction per unit ironmaking amount was expected in the CO$$_{2}$$ reduction process because H$$_{2}$$ not used in RWGS was consumed by iron ore reduction in the BF. However, CO$$_{2}$$ reduction per HTGR was larger in the CO$$_{2}$$ eelctrolysis method.

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