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 journalArticle

23 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 - Feb 14 2014

All Science Journal Classification (ASJC) codes

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

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