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

16 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

Fingerprint

Gas permeability
slags
Reducing Agents
thermophysical properties
Reducing agents
blasts
Blast furnaces
Slags
furnaces
Molten materials
permeability
Thermodynamic properties
pressure drop
gas pressure
Void fraction
voids
Gases
Liquids
liquids
gases

All Science Journal Classification (ASJC) codes

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

Cite this

@article{449ebf87322548fc9068a3b977d6a413,
title = "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",
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.",
author = "Miyuki Hayashi and Sohei Sukenaga and Ko-Ichiro Ohno and Shigeru Ueda and Kohei Sunahara and Noritaka Saito",
year = "2014",
month = "2",
day = "14",
doi = "10.2355/tetsutohagane.100.211",
language = "English",
volume = "100",
pages = "211--226",
journal = "Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan",
issn = "0021-1575",
publisher = "一般社団法人 日本鉄鋼協会",
number = "2",

}

TY - JOUR

T1 - Agenda for low reducing agent operation of blast furnace

T2 - Thermophysical properties of molten slags on the gas permeability at the dripping zone of blast furnace

AU - Hayashi, Miyuki

AU - Sukenaga, Sohei

AU - Ohno, Ko-Ichiro

AU - Ueda, Shigeru

AU - Sunahara, Kohei

AU - Saito, Noritaka

PY - 2014/2/14

Y1 - 2014/2/14

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84893656043&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84893656043&partnerID=8YFLogxK

U2 - 10.2355/tetsutohagane.100.211

DO - 10.2355/tetsutohagane.100.211

M3 - Article

AN - SCOPUS:84893656043

VL - 100

SP - 211

EP - 226

JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan

SN - 0021-1575

IS - 2

ER -