Reduction of Nitrogen Oxides Emission from the Iron Ore Sintering Process by Optimizing the Structure of Carbonaceous Fuels

Eiki Kasai, Fumio Saito

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Combustion experiments of carbonaceous fuel composites were carried out in order to reduce the amount of NOx emitted from the iron are sintering process. The fuel composites prepared were: 1) coke granules having adhering layers of Ca(OH)2 and Fe2O3 mixture and of synthetic calciumferrite (CFs) powders and 2) iron-bearing coke obtained by admixing of iron are powder with coal. The averaged conversion ratio of fuel N into NOx during combustion of the coke granules is lower than that of the normal coke particles. Further reduction of the conversion ratio is achieved for the combustion of coke granules having adhering layer of CF powders. It was confirmed that the presence of Fe2O3 and CFs accelerated the reduction of NO into N2 by CO in the range from 873 to 1393 K. Admixed iron are powder with coal is reduced to metallic iron grains during the coking process and the content of fuel N in the obtained coke samples appreciably decreases. Conversion ratio into NOx during combustion of the coke samples also decreases. This method enables us to reduce significantly the amount of NOx emission by about 50% in comparison to that for normal coke particles.

Original languageEnglish
Pages (from-to)857-864
Number of pages8
Journalkagaku kogaku ronbunshu
Volume20
Issue number6
DOIs
Publication statusPublished - 1994 Jan 1

Keywords

  • Calciumferrite
  • Carbon Monoxide
  • Catalytic Reaction
  • Coke Combustion
  • Environment
  • Iron Oxides
  • Nitrogen Oxides

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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