Agenda for low reducing agent operation of blast furnace: Thermophysical properties of molten slags on the gas permeability at the dripping zone of blast furnace

Miyuki Hayashi, Sohei Sukenaga, Ko Ichiro Ohno, Shigeru Ueda, Kohei Sunahara, Noritaka Saito

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    Currently, low reducing agent operation of blast furnace is actively investigated in order to reduce CO2 emission. However, low reducing agent operation accelerates coke wear, resulting in the decrease in the void fraction in the blast furnace. Particularly, at the dripping zone, the decrement in the void fraction increases the hold-up amount of liquid burden. As a consequence, the gas permeability at the dripping zone becomes lower dramatically. In the present paper, we have focused on the effect of thermophysical properties of molten slags on the gas pressure drop and the liquid hold-up, the measures of the gas permeability, in the counter-current region of gas-liquid flow. It has been considered from the results of hold-up experiments and/or simulations that the surface tensions of molten slags and their contact angles against carbonaceous materials are the most significant properties for the gas pressure drop as well as the liquid hold-up. The previous studies with respect to their properties have been reviewed for the slag compositions and the temperatures close to those at the dripping zone.

    Original languageEnglish
    Pages (from-to)211-226
    Number of pages16
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Volume100
    Issue number2
    DOIs
    Publication statusPublished - 2014

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry

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