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Process flow sheet evaluation of a nuclear hydrogen steelmaking plant applying very high temperature reactors for efficient steel production with less CO$$_{2}$$ emissions

Kasahara, Seiji  ; Inagaki, Yoshiyuki; Ogawa, Masuro

Nuclear hydrogen steelmaking (NHS) system was evaluated by flow sheet analysis using very high temperature reactors (VHTRs) and thermochemical hydrogen production IS process. Heat input and CO$$_{2}$$ emissions including material production, material transportation, and power generation were evaluation criteria. Though total heat input to the NHS system was 130-142% of a conventional blast furnace steelmaking system, CO$$_{2}$$ emissions were 13-21%. Pre-heating of hydrogen by coal combustion before blowing to a shaft furnace was effective to decrease heat input although CO$$_{2}$$ emissions increased. Direct nuclear pre-heating was also effective without increase of CO$$_{2}$$ emissions if close location of the nuclear reactor to the steelmaking plant was publicly accepted. Hydrogen production thermal efficiency had a significant influence on the heat input. Conceptual design of a plant unit of the NHS system producing steel of 1.47 $$times$$ 10$$^{6}$$ t/y with 2 VHTRs of 600MW heat and one shaft furnace and electric arc furnace was proposed. This article is revised from a proceeding presented in HTR2012.

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Category:Nuclear Science & Technology

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