Effect of Hydrogen Addition on Reduction Kinetics of Iron Oxides in Gas-injection BF

Qie, Yana; Lyu, Qing; Li, Jianpeng; Lan, Chenchen; Liu, Xiaojie

doi:10.2355/isijinternational.isijint-2016-356

Cited by 30 publications

(23 citation statements)

References 27 publications

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“…H 2 content also has a positive influence on the extent of reduction. 5) However, the steel industry cannot fully depend on hydrogen as a reducing agent due to the high costs associated with its production, as well as its unavailability in several regions, such as in Europe.…”

Section: Influence Of H 2 -H 2 O Content On the Reduction Of Acid Iromentioning

confidence: 99%

“…However, this effect is less clear during the later stages of reduction, perhaps because of the formation of a dense outer layer that prevents the diffusion of reducing gases. 5,6) The dense, non-porous metallic iron layer is reported to occur at temperatures above 850°C in case of reduction with dry hydrogen and above 800°C when water vapor and hydrogen are used. 7) Moreover, increasing the H 2 content results in a decrease in apparent activation energy, which facilitates the reduction of iron oxides.…”

Section: Influence Of H 2 -H 2 O Content On the Reduction Of Acid Iromentioning

confidence: 99%

“…7) Moreover, increasing the H 2 content results in a decrease in apparent activation energy, which facilitates the reduction of iron oxides. 5) As reduction in a CO atmosphere is generally considered to be controlled by diffusion, 8) the increased H 2 content in a reducing atmosphere improves the reduction of pellets as the diffusion rate improves due to hydrogen's small molecular size. This, consequently, shifts the reduction mechanism towards being controlled by an interface reaction.…”

Section: Influence Of H 2 -H 2 O Content On the Reduction Of Acid Iromentioning

confidence: 99%

“…This, consequently, shifts the reduction mechanism towards being controlled by an interface reaction. 5,6) Iron oxides' reduction behavior in a mixed CO-H 2 atmosphere is complex. FeO reduction with CO is exothermic in nature, but reduction with H 2 is endothermic.…”

Section: Influence Of H 2 -H 2 O Content On the Reduction Of Acid Iromentioning

confidence: 99%

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Influence of H2–H2O Content on the Reduction of Acid Iron Ore Pellets in a CO–CO2–N2 Reducing Atmosphere

et al. 2020

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Using hydrogen as a reducing agent for iron production has been the focus of several studies due to its environmental potential. The aim of this work is to study the influence of H 2-H 2 O content in the gas phase on the reduction of acid iron ore pellets under simulated blast furnace conditions. Temperature and gas compositions for the experiments were determined with multi-point vertical probes in an industrial blast furnace. The results of the reduction tests show that higher temperatures and H 2 content increase the rate and extent of reduction. For all the gas and temperature combinations, morphological, mineralogical, and microstructure changes were observed using different characterization techniques. Microscopy images reveal that H 2-H 2 O, in the gas phase, has a positive influence on reduction, with metallic iron forming at the pellet's periphery and core at lower temperatures compared to CO-CO 2-N 2 reducing gas. Porosity and surface area changes were determined using a gas pycnometer and the BET method. The results indicate that increasing the reduction temperatures and H 2 content results in greater porosity and a larger surface area. Moreover, carbon deposition did not take place, even at lower temperatures. A rate minimum was detected for pellets reduced at 800°C, probably due to metallic iron formation, hindering the diffusion of reducing gases through the product iron layer.

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Section: Influence Of H 2 -H 2 O Content On the Reduction Of Acid Iromentioning

confidence: 99%

Section: Influence Of H 2 -H 2 O Content On the Reduction Of Acid Iromentioning

confidence: 99%

Section: Influence Of H 2 -H 2 O Content On the Reduction Of Acid Iromentioning

confidence: 99%

Section: Influence Of H 2 -H 2 O Content On the Reduction Of Acid Iromentioning

confidence: 99%

See 2 more Smart Citations

Influence of H2–H2O Content on the Reduction of Acid Iron Ore Pellets in a CO–CO2–N2 Reducing Atmosphere

et al. 2020

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“…Besides carbon and carbon monoxide, there is one more reducer in the blast furnace process -hydrogen [33][34][35][36]. As has already been mentioned, hydrogen can replace CO in magnetite and hematite reduction…”

Section: The Role Of Hydrogen In Wustite Reductionmentioning

confidence: 99%

Support algorithm for blast furnace operation with optimal fuel consumption

Bernasowski

Klimczyk

Stachura

2019

J min metall B Metall

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Fuel consumption in blast furnaces depends on many factors that are mainly conditioned by the technological level of a given blast furnace, the steel mill in which it operates, and the type and quality of ferrous feed, coke, and additional reducing agents. These are global factors which a furnace crew cannot control during operation. On the other hand, using their own experience and decision-making software, a crew can run a blast furnace with minimal fuel consumption under current batch and process conditions. The paper presents a model-based algorithm for optimizing the operation of blast furnaces to achieve the lowest fuel consumption. The algorithm allows the heat demands to be continuously calculated and highlights any wastage that could be reduced without affecting the stable operation of the blast furnace.

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Effects of Adding Different Proportions of H₂ to the Simulated Hydrogen‐Rich Blast Furnace

Fan

Wang³

et al. 2022

Chem Eng & Technol

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The volume‐fraction changes of CO2 and H2O after adding different proportions of H2 to the hydrogen‐rich blast furnace were simulated by thermodynamic calculations to evaluate the effects of H2 on coke gasification in a blast furnace. Thermodynamic calculations indicated that the H2O content in the mixed gas gradually increased with higher H2 content. The coke gasification kinetics effective diffusion coefficient De and interfacial reaction rate constant k+ of the coke gasification reaction improved with higher H2 content. In addition, the reactivity of cokes enhanced and the coke strength after reaction decreased with higher H2 content. Mercury porosimeter experiments demonstrated that the coke gasification reaction mainly occurred on the surface.

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Effect of Hydrogen Addition on Reduction Kinetics of Iron Oxides in Gas-injection BF

Cited by 30 publications

References 27 publications

Influence of H<sub>2</sub>–H<sub>2</sub>O Content on the Reduction of Acid Iron Ore Pellets in a CO–CO<sub>2</sub>–N<sub>2</sub> Reducing Atmosphere

Influence of H<sub>2</sub>–H<sub>2</sub>O Content on the Reduction of Acid Iron Ore Pellets in a CO–CO<sub>2</sub>–N<sub>2</sub> Reducing Atmosphere

Support algorithm for blast furnace operation with optimal fuel consumption

Effects of Adding Different Proportions of H₂ to the Simulated Hydrogen‐Rich Blast Furnace

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Effect of Hydrogen Addition on Reduction Kinetics of Iron Oxides in Gas-injection BF

Cited by 30 publications

References 27 publications

Influence of H<sub>2</sub>–H<sub>2</sub>O Content on the Reduction of Acid Iron Ore Pellets in a CO–CO<sub>2</sub>–N<sub>2</sub> Reducing Atmosphere

Influence of H<sub>2</sub>–H<sub>2</sub>O Content on the Reduction of Acid Iron Ore Pellets in a CO–CO<sub>2</sub>–N<sub>2</sub> Reducing Atmosphere

Support algorithm for blast furnace operation with optimal fuel consumption

Effects of Adding Different Proportions of H2 to the Simulated Hydrogen‐Rich Blast Furnace

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Product

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Effects of Adding Different Proportions of H₂ to the Simulated Hydrogen‐Rich Blast Furnace