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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 an ironmaking system based on active carbon recycling energy system (iACRES)

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

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

高温ガス炉(HTGR)を適用した炭素循環製鉄(iACRES)のフローモデルによるプロセス評価を行った。高温電解で高炉ガス中のCO$$_{2}$$をCOに還元して高炉にリサイクルするSOECシステムと、ISプロセスで製造したH$$_{2}$$による逆シフト反応でCO$$_{2}$$をCOに還元して高炉にリサイクルするRWGSシステムを検討し、通常の高炉製鉄と比較した。原料炭消費量はSOECシステムで4.3%、RWGSシステムで10.3%削減され、CO$$_{2}$$排出量はSOECシステムで3.4%、RWGSシステムで8.2%削減された。逆シフト反応で消費されずに残存したH$$_{2}$$が高炉で鉄源の還元に使われることが、RWGSシステムにおいて原料炭消費の節約割合とCO$$_{2}$$排出削減率が大きくなった原因であった。SOECシステムではCO$$_{2}$$電解、RWGSシステムではISプロセス水素製造が最も多くの熱量を消費し、HTGR熱の効率的利用のために、CO$$_{2}$$電解温度の最適化や高いISプロセス水素製造効率が求められた。典型的な高炉1基あたり、SOECシステムでは0.5基、RWGSシステムでは2基のHTGRが必要となった。逆シフト反応で未反応のH$$_{2}$$を再利用することで、RWGSシステムのHTGR熱の効率的利用と、CO$$_{2}$$排出量削減が期待される。

Reducing coking coal consumption and CO$$_{2}$$ emissions by application of HTGRs (high temperature gas-cooled reactors) to iACRES (ironmaking system based on active carbon recycling energy system) was investigated using process flow modeling. Two systems were evaluated: a SOEC (solid oxide electrolysis cell) system using CO$$_{2}$$ electrolysis and a RWGS (reverse water-gas shift reaction) system using RWGS reaction with H$$_{2}$$ produced by IS (iodine-sulfur) process. Coking coal consumption was reduced from a conventional BF (blast furnace) steelmaking system by 4.3% in the SOEC system and 10.3% in the RWGS system. CO$$_{2}$$ emissions were decreased by 3.4% in the SOEC system and 8.2% in the RWGS system. Remaining H$$_{2}$$ from the RWGS reactor was used as reducing agent in the BF in the RWGS system. This was the reason of the larger reduction of coking coal consumption and CO$$_{2}$$ emissions. Electricity generation for SOEC occupied most of HTGR heat usage in the SOEC system. H$$_{2}$$ production in the IS process used most of the HTGR heat in the RWGS system. Optimization of the SOEC temperature for the SOEC system and higher H$$_{2}$$ production thermal efficiency in the IS process for the RWGS system will be useful for more efficient heat utilization. One typical-sized BF required 0.5 HTGRs and 2 HTGRs for in the SOEC system and RWGS system, respectively. CO$$_{2}$$ emissions reduction per unit heat input was larger in the SOEC system. Recycling H$$_{2}$$ to the RWGS will be useful for smaller emissions per unit heat in the RWGS system.

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