Process evaluation of use of high temperature gas-cooled reactors to an ironmaking system based on active carbon recycling energy system

Kentaro Hayashi, Seiji Kasahara, Kouhei Kuribara, Takao Nakagaki, Xing L. Yan, Yoshiyuki Inagaki, Masuro Ogawa

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Reducing coking coal consumption and CO2 emissions by application of iACRES (ironmaking system based on active carbon recycling energy system) was investigated using process flow modeling to show effectiveness of HTGRs (high temperature gas-cooled reactors) adoption to iACRES. Two systems were evaluated: a SOEC (solid oxide electrolysis cell) system using CO2 electrolysis and a RWGS (reverse water-gas shift reaction) system using RWGS reaction with H2 produced by iodine-sulfur process. Both reduction of the coking coal consumption and CO2 emissions were greater in the RWGS system than those in the SOEC system. It was the reason of the result that excess H 2 not consumed in the RWGS reaction was used as reducing agent in the blast furnace as well as CO. Heat balance in the HTGR, SOEC and RWGS modules were evaluated to clarify process components to be improved. Optimization of the SOEC temperature was desired to reduce Joule heat input for high efficiency operation of the SOEC system. Higher H2 production thermal efficiency in the IS process for the RWGS system is effective for more efficient HTGR heat utilization. The SOEC system was able to utilize HTGR heat to reduce CO2 emissions more efficiently by comparing CO2 emissions reduction per unit heat of the HTGR.

    Original languageEnglish
    Pages (from-to)348-358
    Number of pages11
    JournalISIJ International
    Volume55
    Issue number2
    DOIs
    Publication statusPublished - 2015

    Fingerprint

    Regenerative fuel cells
    High temperature gas reactors
    Water gas shift
    Recycling
    Carbon
    Coal
    Coking
    Reducing Agents
    Reducing agents
    Carbon Monoxide
    Blast furnaces
    Iodine
    Electrolysis
    Sulfur
    Hot Temperature

    Keywords

    • Carbon recycling iron and steel production
    • CO electrolysis
    • CO emissions
    • High temperature gas-cooled reactor
    • Process flow analysis
    • Reverse water gas shift reaction

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Mechanics of Materials
    • Materials Chemistry
    • Metals and Alloys

    Cite this

    Process evaluation of use of high temperature gas-cooled reactors to an ironmaking system based on active carbon recycling energy system. / Hayashi, Kentaro; Kasahara, Seiji; Kuribara, Kouhei; Nakagaki, Takao; Yan, Xing L.; Inagaki, Yoshiyuki; Ogawa, Masuro.

    In: ISIJ International, Vol. 55, No. 2, 2015, p. 348-358.

    Research output: Contribution to journalArticle

    Hayashi, Kentaro ; Kasahara, Seiji ; Kuribara, Kouhei ; Nakagaki, Takao ; Yan, Xing L. ; Inagaki, Yoshiyuki ; Ogawa, Masuro. / Process evaluation of use of high temperature gas-cooled reactors to an ironmaking system based on active carbon recycling energy system. In: ISIJ International. 2015 ; Vol. 55, No. 2. pp. 348-358.
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