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


    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


    OtherInternational Conference on Power Engineering, ICOPE 2015


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

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology


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