Optimization of biomass utilization for reducing CO2 in ironmaking process

Shigeru Ueda, Kentaro Watanabe, Kazunari Yanagiya, Ryo Inoue, Tatsuro Ariyama

Research output: Contribution to conferencePaperpeer-review

13 Citations (Scopus)

Abstract

Reduction of Green House Gases is an important issue. Steel industry is actively making an effort to reduce carbon dioxide emission. Biomass can be considered as a carbon neutral material and would be an alternative energy for ironmaking. In the present study, optimum biomass utilization in ironmaking process is studied for reducing carbon dioxide emission. The calorific value of biomass is lower than coal, because the molar concentration of oxygen in biomass is more than that in coal due to carboxylic group mainly contained in cellulose. Several heat pretreatments of biomass were tried in the experimental work. It was found that carbonization of biomass in the inert gas over 300 was effective to control selectively the oxygen concentration in biomass and to increase reactivity of biomass char with CO2 gas. The reactivity is much higher than that of coke, therefore biomass char would be an attractive reducing agent. Biomass char is suitable to be injected into blast furnace from tuyeres as an alternative reducing agent. Moreover, by using high reactive biomass char as reductant, iron ore composite can be produced to control the reduction behavior of burden in the blast furnace. Reactivity of iron carbon composite with biomass char was measured. The reduction behavior of iron composite contained biomass char was much improved than conventional composite. On the basis of heat and material balance model of the blast furnace, the optimum biomass utilization in ironmaking was quantitatively evaluated from the viewpoint of effective reduction of carbon dioxide.

Original languageEnglish
Pages593-599
Number of pages7
Publication statusPublished - 2009 Dec 1
Event5th International Congress on the Science and Technology of Ironmaking, ICSTI 2009 - Shanghai, China
Duration: 2009 Oct 202009 Oct 22

Other

Other5th International Congress on the Science and Technology of Ironmaking, ICSTI 2009
CountryChina
CityShanghai
Period09/10/2009/10/22

Keywords

  • Biomass
  • Biomass injection
  • Blast furnace
  • Carbon dioxide emission
  • Carbon iron ore composite
  • Carbonization
  • Ironmaking

ASJC Scopus subject areas

  • Metals and Alloys

Fingerprint Dive into the research topics of 'Optimization of biomass utilization for reducing CO<sub>2</sub> in ironmaking process'. Together they form a unique fingerprint.

Cite this