Evaluation of active carbon recycling energy system for ironmaking process by modeling with Aspen Plus

Hayashi, Kentaro*; Suzuki, Katsuki*; Kurihara, Kohei*; Nakagaki, Takao*; Kasahara, Seiji  

Evaluation of active carbon recycling energy system for ironmaking process by modeling with Aspen Plus was carried out by CO emission and exergy consumption. The investigated CO recovery methods were CO electrolysis and CO reduction in reverse water gas shift reaction (RWGS) using H made in the HTGR-IS process. More H than stoichiometric amonut was required to keep RWGS equilibrium and H not used in RWGS was consumed by iron ore reduction in the BF. Though CO decrease was more in CO reduction process, exergy consumption was larger. CO decrease was larger in higher BFG circulation ratio and CO reduction ratio due to more carbon recycle. Exergy consumption was large in the higher reduction ratio because of more electricity consumption.