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

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

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 from blast furnaces (BFs), was carried out by heat and material flow analysis. The investigated CO recovery methods were CO electrolysis and CO reduction in reverse water gas shift reaction (RWGS) using H made in the IS process. HTGR number per BF was large in the CO reduction process because more H than stoichiometric amonut was required to keep RWGS equilibrium. More CO reduction per unit ironmaking amount was expected in the CO reduction process because H not used in RWGS was consumed by iron ore reduction in the BF. However, CO reduction per HTGR was larger in the CO eelctrolysis method.