Quantitative evaluation of CO2 emission reduction and energy conservation in iron making process by using in-plant CO recycling system

Katsuki Suzuki, Takao Nakagaki, Ikuhiko Sumi, Jun Ishii

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Japanese iron and steel manufacturing industries import a significant amount expensive coking coal (coke); reduction of coke consumption is a great challenge for the industry. In this paper, we propose an in-plant CO recycling system which supplements coke with gaseous CO as a reducing agent in the blast furnace. Process flow diagrams including a blast furnace with CO recycling, coke oven, and hot blast stove were built in Aspen Plus and the effect of CO recycling on coal conservation, exergy efficiency, and CO2 emission were quantitatively evaluated. In the blast furnace the input exergy, effective exergy ratio, overall CO2 emissions, and the input coke decreased as the degree of CO circulation was increased. The recirculated CO gas was separated from the Blast Furnace Gas (BFG), the coke oven gas, and the converter gas. The separation and recycling of CO into the blast furnace resulted in the decrease of input coke, and input exergy by 13.0% and 10.3%, respectively. On the other hand, overall CO2 emissions increased by 2.6%.

    Original languageEnglish
    Title of host publicationICOPE 2015 - International Conference on Power Engineering
    PublisherJapan Society of Mechanical Engineers
    Publication statusPublished - 2015
    EventInternational Conference on Power Engineering, ICOPE 2015 - Yokohama, Japan
    Duration: 2015 Nov 302015 Dec 4

    Other

    OtherInternational Conference on Power Engineering, ICOPE 2015
    CountryJapan
    CityYokohama
    Period15/11/3015/12/4

    Fingerprint

    Blast furnaces
    Coke
    Exergy
    Recycling
    Energy conservation
    Iron
    Coke ovens
    Gases
    Coal
    Stoves
    Coking
    Reducing agents
    Industry
    Conservation
    Steel

    Keywords

    • Exergy analysis
    • Heat flux ratio
    • Mass and heat balance
    • Pressure swing adsorption
    • Process simulation

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology

    Cite this

    Suzuki, K., Nakagaki, T., Sumi, I., & Ishii, J. (2015). Quantitative evaluation of CO2 emission reduction and energy conservation in iron making process by using in-plant CO recycling system. In ICOPE 2015 - International Conference on Power Engineering Japan Society of Mechanical Engineers.

    Quantitative evaluation of CO2 emission reduction and energy conservation in iron making process by using in-plant CO recycling system. / Suzuki, Katsuki; Nakagaki, Takao; Sumi, Ikuhiko; Ishii, Jun.

    ICOPE 2015 - International Conference on Power Engineering. Japan Society of Mechanical Engineers, 2015.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Suzuki, K, Nakagaki, T, Sumi, I & Ishii, J 2015, Quantitative evaluation of CO2 emission reduction and energy conservation in iron making process by using in-plant CO recycling system. in ICOPE 2015 - International Conference on Power Engineering. Japan Society of Mechanical Engineers, International Conference on Power Engineering, ICOPE 2015, Yokohama, Japan, 15/11/30.
    Suzuki K, Nakagaki T, Sumi I, Ishii J. Quantitative evaluation of CO2 emission reduction and energy conservation in iron making process by using in-plant CO recycling system. In ICOPE 2015 - International Conference on Power Engineering. Japan Society of Mechanical Engineers. 2015
    Suzuki, Katsuki ; Nakagaki, Takao ; Sumi, Ikuhiko ; Ishii, Jun. / Quantitative evaluation of CO2 emission reduction and energy conservation in iron making process by using in-plant CO recycling system. ICOPE 2015 - International Conference on Power Engineering. Japan Society of Mechanical Engineers, 2015.
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    abstract = "Japanese iron and steel manufacturing industries import a significant amount expensive coking coal (coke); reduction of coke consumption is a great challenge for the industry. In this paper, we propose an in-plant CO recycling system which supplements coke with gaseous CO as a reducing agent in the blast furnace. Process flow diagrams including a blast furnace with CO recycling, coke oven, and hot blast stove were built in Aspen Plus and the effect of CO recycling on coal conservation, exergy efficiency, and CO2 emission were quantitatively evaluated. In the blast furnace the input exergy, effective exergy ratio, overall CO2 emissions, and the input coke decreased as the degree of CO circulation was increased. The recirculated CO gas was separated from the Blast Furnace Gas (BFG), the coke oven gas, and the converter gas. The separation and recycling of CO into the blast furnace resulted in the decrease of input coke, and input exergy by 13.0{\%} and 10.3{\%}, respectively. On the other hand, overall CO2 emissions increased by 2.6{\%}.",
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    AU - Nakagaki, Takao

    AU - Sumi, Ikuhiko

    AU - Ishii, Jun

    PY - 2015

    Y1 - 2015

    N2 - Japanese iron and steel manufacturing industries import a significant amount expensive coking coal (coke); reduction of coke consumption is a great challenge for the industry. In this paper, we propose an in-plant CO recycling system which supplements coke with gaseous CO as a reducing agent in the blast furnace. Process flow diagrams including a blast furnace with CO recycling, coke oven, and hot blast stove were built in Aspen Plus and the effect of CO recycling on coal conservation, exergy efficiency, and CO2 emission were quantitatively evaluated. In the blast furnace the input exergy, effective exergy ratio, overall CO2 emissions, and the input coke decreased as the degree of CO circulation was increased. The recirculated CO gas was separated from the Blast Furnace Gas (BFG), the coke oven gas, and the converter gas. The separation and recycling of CO into the blast furnace resulted in the decrease of input coke, and input exergy by 13.0% and 10.3%, respectively. On the other hand, overall CO2 emissions increased by 2.6%.

    AB - Japanese iron and steel manufacturing industries import a significant amount expensive coking coal (coke); reduction of coke consumption is a great challenge for the industry. In this paper, we propose an in-plant CO recycling system which supplements coke with gaseous CO as a reducing agent in the blast furnace. Process flow diagrams including a blast furnace with CO recycling, coke oven, and hot blast stove were built in Aspen Plus and the effect of CO recycling on coal conservation, exergy efficiency, and CO2 emission were quantitatively evaluated. In the blast furnace the input exergy, effective exergy ratio, overall CO2 emissions, and the input coke decreased as the degree of CO circulation was increased. The recirculated CO gas was separated from the Blast Furnace Gas (BFG), the coke oven gas, and the converter gas. The separation and recycling of CO into the blast furnace resulted in the decrease of input coke, and input exergy by 13.0% and 10.3%, respectively. On the other hand, overall CO2 emissions increased by 2.6%.

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    KW - Mass and heat balance

    KW - Pressure swing adsorption

    KW - Process simulation

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