Theoretical Study of the Hydrogen Influence on Iron Oxides Reduction at the Blast Furnace Process

Abstract

In recent years, environmental considerations and requirements about limiting of carbon dioxide emissions into the atmosphere again forced researchers to consider hydrogen as an alternative reducer at the ironmaking processes. In those studies, the reduction of iron oxides by a mixture of hydrogen and carbon monoxide mainly was considered, but reducing ability of solid carbon was taken into account rarely. The article presents an analysis of the impact of different content of hydrogen and carbon monoxide on the reduction processes equilibrium at the blast furnace conditions. Calculations were performed by using the FactSage thermochemical software and databases. The study presents influence of hydrogen content in the bosh gas on range of wustite stability at the blast furnace process conditions. The calculations revealed possible mechanisms of wustite reduction and role of water−gas shift reaction and hydrogen itself.

Reduction of Iron Oxides with Hydrogen—A Review

“…It is not possible to substitute all the coke with hydrogen. A myriad of studies and tests have been carried out to investigate the effect of the addition of hydrogen in the blast furnace gas; all of them show similar results . The addition of hydrogen is only useful to a certain extent due to its endothermic behavior.…”

“…A myriad of studies and tests have been carried out to investigate the effect of the addition of hydrogen in the blast furnace gas; all of them show similar results. [13][14][15][16][17][18] The addition of hydrogen is only useful to a certain extent due to its endothermic behavior. Higher hydrogen contents will lead to higher energy demand and therefore more coke is required to provide sufficient energy.…”

Gaseous Reduction of Titania-ferrous Solution Ore by H₂–Ar Mixture

“…1) Due to the shortage of high-quality hematite resource, TFSO have been widely investigated as an alternative source of conventional iron ore. [2][3][4][5][6][7] The advantages of TFSO in large deposit, low mining cost, available iron grades, among others, caused industrial utilize ways of TFSO becoming focusing subjects such as the aspects in beneficiation, 8,9) sintering, [10][11][12][13] pelletizing, [14][15][16] particularly the gaseous reduction in hydrogen which is beneficial to improve the dynamic condition and lower the adverse impact on environment at the same time. [17][18][19][20][21][22][23][24][25][26] Eungyeul P 27) studied the influences of temperature and hydrogen contents on TFSO reduction at the constant condition of 25vol%H 2 -Ar and 1 173 K respectively. In addition, the reduction path of TFSO by H 2 -Ar gas mixture at temperatures above 1 173 K was proposed as Fe 3-x Ti x O 4 → FeO + Fe 3-x-δ Ti x + δ O 4 → Fe + Fe 3-x-δ Ti x + δ O 4 → Fe + xTiO 2 .…”

Support algorithm for blast furnace operation with optimal fuel consumption

“…Therefore, hydrogen only enhances indirect reduction and thus decreases direct reduction [37]. This means that the minimum amount of carbon which has to be burnt to obtain CO for indirect reduction is reduced.…”