Kinetics Analysis of Steam Reforming of Methane on Sponge Iron

Ribeiro, Tiago Ramos; Neto, João Batista Ferreira; Poço, João Guilherme Rocha; Takano, Cyro; Kolbeinsen, Leiv; Ringdalen, Eli

doi:10.2355/isijinternational.isijint-2021-472

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…[10] For these reasons, the most available models in the literature take into consideration the reduction through a gas mixture of hydrogen and carbon monoxide in order to simplify the thermochemical and thermophysical phenomena involved in the process development. [11,12] In the direct reduction process, the reducing agent converts the iron ore to elemental iron directly. The final product is directly reduced iron (DRI) including matrix elements from the ore.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen‐Based Direct Reduction of Iron Oxides Pellets Modeling

Cavaliere

Perrone

Marsano

et al. 2023

steel research int.

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The present study deals with the analyses of the direct reduction kinetics during the hydrogen reduction of industrial iron oxide pellets. Various types of pellets with different percentage of total iron content and metal oxides are examined. They are reduced at different temperatures and pressure (700–1100 °C and 1–6 bar) in hydrogen atmosphere. The reduction behavior is described in terms of time to reduction, rate of reduction, and kinetics constant. All the obtained results are analyzed through the employment of a commercial multiobjective optimization tool to precisely define the weight that each single parameter has on the reduction behavior. It is shown that from the point of view of the processing conditions, temperature is the main factor influencing the time to total reduction. From the point of view of the pellets properties, it is mainly influenced by the total iron percentage and then by porosity and basicity index. Also, the kinetics behavior is largely influenced by the reduction temperature even if it is mainly governed by the porosity and pores size from the point of view of the reduced pellets. The reduction rate is also mainly influenced by temperature and then by iron percentage, gas pressure, basicity index, and porosity.

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Section: Introductionmentioning

confidence: 99%

“…For these reasons, the most available models in the literature take into consideration the reduction through a gas mixture of hydrogen and carbon monoxide in order to simplify the thermochemical and thermophysical phenomena involved in the process development. [ 11,12 ]…”

Section: Introductionmentioning

confidence: 99%

Hydrogen‐Based Direct Reduction of Iron Oxides Pellets Modeling

Cavaliere

Perrone

Marsano

et al. 2023

steel research int.

View full text Add to dashboard Cite

show abstract

“…The composition data on the raw materials to be fed are needed for this analysis. The compositions of the DRI 5,32,33) , coke 34,35) , limestone 36) , and steel scrap 37,38) used in this study are shown in Table 6. The quality of low-P DRI and high-P DRI are compared in Table 7.…”

Section: Analytical Model Description 1 Setting Up the Templatementioning

confidence: 99%

“…The quality of low-P DRI and high-P DRI are compared in Table 7. The composition of Low-P DRI was estimated from that of the iron ore pellet 32) , assuming that the 95mass% of total Fe is reduced to metallic iron and the carbon content of DRI is 1 mass% 5) . The composition of high-P DRI was estimated from that of the iron ore containing P at high content 33) , assuming that the fraction of the metallic iron and the mass concentration ratio of CaO to SiO2 are the same as those of low-P DRI and the carbon content is 0.…”

Section: Analytical Model Description 1 Setting Up the Templatementioning

confidence: 99%

Thermodynamic Analysis on Slag/Metal Reactions in Steelmaking Process Using Direct Reduced Iron and Steel Scraps

Kato,

Ono

2024

ISIJ Int.

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Hydrogen reduction processes of iron ores are being developed to achieve carbon neutrality.However, high-grade iron ore pellets used in the current direct reduction process will be depleted in the future. On the other hand, steel scraps recovered from society are usually contaminated with tramp elements, which are difficult to remove in the current steel refining processes. To produce high-quality steel from DRI and steel scraps, molten steel composition in the melting process should be optimized considering the impurities originating in iron resources and conditions such as temperature and oxygen potential. In this study, the equilibrium of slag/metal reactions in the steelmaking process using DRI and steel scraps were thermodynamically analyzed, and the effect of using scrap on the composition of molten steel and slag and the conditions to produce lowphosphorous molten steel from high-P content DRI and steel scrap were discussed. The use of steel scrap showed such advantages as a decrease in the concentrations of Si, S, and P originating from high-P DRI, a decrease in the amount of slag, and a reduction in the amount of limestone required to maintain slag basicity. Moreover, the P content of iron can be decreased to 13 mass ppm at 1873K and 𝑃 = 10 -10 atm even when the high-P DRI is used in combination with steel scrap. The thermodynamic analysis showed the potential for carbon-free steel by optimizing the hydrogen reduction process and the melting process of DRI with steel scraps..

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“…For these reasons, the most available models in the literature take into consideration the reduction through a gas mixture of hydrogen and carbon monoxide in order to simplify the thermo-chemical and thermo-physical phenomena involved in the process development [13,14].…”

Section: Introductionmentioning

confidence: 99%

Critical analysis of variable atmosphere gaseous reduction of iron oxides pellets

Cavaliere

Perrone

Marsano

2023

Ironmaking & Steelmaking

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The paper deals with the analyses of the direct reduction kinetics of industrial iron oxide pellets. Various types of pellets were reduced at different temperatures and pressure (700-1100°C and 1-6 bar) in various atmospheres with different contents of hydrogen and carbon monoxide. The reduction behaviour was described in terms of time to reduction, rate of reduction, and kinetics constant. For those pellets reduced in presence of carbon monoxide, also the carbon percentage in the reduced pellets was taken into account. All the obtained results were analysed through the employment of a commercial multi-objective optimisation tool (modeFrontier) in order to precisely define the weight that each single parameter has on the reduction behaviour of the pellets. The performed analyses allowed also to correlate the different processing parameters and the pellets properties in order to define the kinetics conditions as well as the factors limiting the reduction process.

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Kinetics Analysis of Steam Reforming of Methane on Sponge Iron

Cited by 7 publications

References 34 publications

Hydrogen‐Based Direct Reduction of Iron Oxides Pellets Modeling

Hydrogen‐Based Direct Reduction of Iron Oxides Pellets Modeling

Thermodynamic Analysis on Slag/Metal Reactions in Steelmaking Process Using Direct Reduced Iron and Steel Scraps

Critical analysis of variable atmosphere gaseous reduction of iron oxides pellets

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