Estimation of the H2 Gas Utilization Ratio Using a BF Shaft Inner Reaction Simulator

Park, Tae Jun; Lee, Jong Hyup; Kim, Dong Geun; Kim, Hyuk

doi:10.1007/s11663-019-01768-w

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…In fact, as the most active reducing agent, hydrogen can be well diffused to the pores of the iron ores, thereby it is a more effective deoxidizer than carbon monoxide even at low temperatures, possessing 14 times higher reduction potential than that of CO. In addition, H 2 directly participates in the reduction reaction without any conversion, resulting in higher reduction efficiency and rate than carbon Compared with the conventional blast furnace operation, the addition of hydrogen can significantly improve the gas utilization rate [52,53].…”

Section: Effect Of Hydrogen Enrichment In Blast Furnace On Reduction ...mentioning

confidence: 99%

Review of hydrogen-rich ironmaking technology in blast furnace

Chen

Zuo

2021

Ironmaking & Steelmaking

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The global warming promotes the steel industry to replace part of coke by injecting hydrogen-rich fuel into the blast furnace to reduce CO 2 emissions and energy consumption. In this paper, the injected hydrogen-rich fuels and effects of hydrogen-rich smelting on burden reduction and property evolution were introduced, and the hot events related to hydrogen metallurgy were summarized. Increasing hydrogen content changes the thermodynamic and kinetic conditions of chemical reactions, changing the reduction behaviour of iron oxides and affecting the burden properties evolution and soft melting behaviour. Correspondingly the coke solution loss alters due to more H 2 O existence. In addition, the temperature and gas flow distribution are altered, affecting the iron oxide reduction rate and efficiency of blast furnace operation process. At present, some hydrogen metallurgy projects have been launched, making expected progress, which provides reference and thinking for the large-scale industrial application of hydrogen in blast furnace.

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Section: Effect Of Hydrogen Enrichment In Blast Furnace On Reduction ...mentioning

confidence: 99%

Review of hydrogen-rich ironmaking technology in blast furnace

Chen

Zuo

2021

Ironmaking & Steelmaking

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“…In this route, about 70 pct of the CO 2 is emitted from the BF that is inherently based on coal (in the form of coke and pulverized coal) and the mechanical properties of coke for building a strong and permeable bed. [1] The coal-dependent BF is thus not optimal for deep decarbonization of the steel industry although the reactor itself has been identified as the most energy-efficient means for producing hot metal. Focusing on a considerable or even full decarbonization, the last few years have seen an increasing debate and a number of proposals on the use of hydrogen gas (H 2 ) for direct reduction of iron ore with no emissions other than water vapor.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Operation of the H2 Shaft Furnace with Top Gas Recycling

Shao

Wang

Saxén

et al. 2021

Metall Mater Trans B

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The breakthrough route involving a reduction shaft furnace operated with pure hydrogen gas (here called H 2-SF) and the electric arc furnace is widely accepted as one of the most viable future alternatives for industrial-scale production of primary steel with minor CO 2 emissions. It has been clarified that the largest portion of the total energy for the entire route is consumed by the H 2-SF operation, but this unit has not yet received much attention and should therefore be explored. For this, a mathematical model of a reduction shaft furnace is presented in this paper, where a set of simulations were also performed to shed more light on the operation of the H 2-SF equipped with a top gas recycling system. The results show that a high gas feed rate is required for guaranteeing a smooth H 2-SF operation due to the strong heat demand. An increase in the feed temperature of the gas or in furnace height can reduce the required gas feed. However, an excessive length may conversely result in an increase in the total energy consumption. The model and its results are expected to be helpful for gaining a better understanding of the complex processes in and constraints of the H 2-SF.

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“…It was reported that the reduction rate of wustite was enhanced by approximately 1.2 times owing to the water-gas shift reaction [6]. The reducing gas utilisation ratio, investigated using a blast furnace shaft inner reaction simulator, depended on the water gas shift reaction and gasification of carbon [7]. The possibility of utilising H 2 to lower CO 2 emissions and the changes in the specific carbon rate according to the H 2 injection rate were evaluated by heat and mass balance during the operation of the blast furnace [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Reaction Behaviour of Partially Reduced Iron under Blast Furnace Conditions

Choi

Min

2021

Metals

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The reaction behaviour of partially reduced iron (PRI) was studied to understand the effect of PRI utilisation in the blast furnace process. For quantitative analysis, the reaction behaviour of PRI under typical operating conditions of a blast furnace was measured using the thermogravimetric method along with the reduction behaviour of hematite and sinter. Experimental results indicated that the reoxidation behaviour of the PRI under the conditions of the upper shaft of the blast furnace retarded the indirect reduction rate in the lower shaft. The rate constants derived from the grain model, experimental results of scanning electron microscopy, and porosimetry analysis indicated that the phenomenon of reduction retardation of PRI under the conditions of the lower shaft originated owing to the reoxidation of PRI, resulting in the blockage of pores. The reaction behaviour considering the reaction characteristics of PRI was derived under conventional blast furnace conditions.

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Estimation of the H2 Gas Utilization Ratio Using a BF Shaft Inner Reaction Simulator

Cited by 9 publications

References 14 publications

Review of hydrogen-rich ironmaking technology in blast furnace

Review of hydrogen-rich ironmaking technology in blast furnace

A Numerical Study on the Operation of the H2 Shaft Furnace with Top Gas Recycling

Investigation on the Reaction Behaviour of Partially Reduced Iron under Blast Furnace Conditions

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