Effect of Oxygen Enrichment on Top Layer Sinter Properties

Rajak, Dharmendra Kumar; Ballal, N. B.; Nurni, Viswanathan; Singhai, Mrigandra

doi:10.2355/isijinternational.isijint-2020-125

Cited by 7 publications

(6 citation statements)

References 17 publications

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“…Previous studies have reported that the high temperature holding time increases with oxygen enrichment in the range up to 35 vol%-O 2 4,8,9) , while the maximum temperature and the high temperature holding time tend to decrease in the range of 40 vol%-O 2 .…”

Section: Effect Of Oxygen Enrichment On Sintering Productivitymentioning

confidence: 91%

“…The effect of the oxygen concentration has been studied mainly through sinter pot tests and simulations [2][3][4][5][6][7][8][9][10] , and it has been reported that the sintering rate is improved by oxygen enrichment.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, in the range of 21 to 35 vol%-O 2 , it has been reported that strength and yield do not change significantly [3][4][5] or that yield increases 6) or that both strength and yield increase 7 -8) regardless of the shortening of the sintering time. The reasons for the improvement in strength and yield have been discussed from two perspectives, the first being that oxygen enrichment promotes coke combustion, which increases the temperature in the combustion zone and extends the high temperature holding time 2,4,8,9) . This effect increases the amount of melt and is thought to contribute to quality improvement.…”

Section: Introductionmentioning

confidence: 99%

“…This effect increases the amount of melt and is thought to contribute to quality improvement. As the second perspective, calcium ferrite (CF), which is a high strength structure 10,11) , can be increased by oxygen enrichment 8,12) , and this is also considered to be a factor in high strength. However, under oxygen-enriched conditions where the heat transfer speed deviates significantly from the combustion speed, as pointed out by Voice and Wild, the maximum temperature starts to drop and quality is expected to deteriorate, but the effects on sinter strength and yield and the mechanism of liquid phase formation in this 4 situation are not clear.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Oxygen Enrichment on Melting Behavior in Sintering Process

Takehara,

Higuchi,

Yamamoto

2024

ISIJ Int.

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In the sintering process, productivity and strength are essential indicators, and it is known that they are closely related to the sintering time and temperature. Since the sintering time and high temperature holding time vary greatly depending on the combustion behavior of coke breeze, various studies have been conducted on the influence of oxygen, which is a critical element in sintering phenomena. However, the influence of oxygen enrichment on sinter strength and yield has not yet been unified. In this study, sintering productivity, strength and yield were investigated when the oxygen concentration of the inlet gas was increased to 40 vol%. In addition, the heat profile of pot tests and the effect of the oxygen partial pressure on the melting property were analyzed from the viewpoint of thermodynamics. As a result, it was found that yield showed the maximum value at 30 vol%-O 2 and strength increased with oxygen enrichment. As for yield, it was found that the effect of the heat profile was significant, and deviation between the heat transfer speed and the combustion speed started when the oxygen concentration exceeded 30 vol%. Regarding strength, it was suggested that strength improvement was caused by the increase in the amount of melt produced by oxygen enrichment in addition to the effect of the high temperature holding time.

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Section: Effect Of Oxygen Enrichment On Sintering Productivitymentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Oxygen Enrichment on Melting Behavior in Sintering Process

Takehara,

Higuchi,

Yamamoto

2024

ISIJ Int.

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“…As the raw material layer is stacked higher, the area of the surface layer with insufficient heat retention time is reduced, and the quality of the entire sinter can be increased [3]. Sufficient air permeability must be secured to stack the raw material layer high, and coal components must be allowed to accumulate on the upper part to transfer the heat from the top to the bottom effectively.…”

Section: Introduction 1background Of Studymentioning

confidence: 99%

Development of Cycloid-Shaped Roll Charging Chute for Sintering Process for Energy Decarbonization and Productivity Improvement in Steel Plants

Kwon,

Choi,

Lee

2024

Energies

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The global steel industry is rapidly transitioning towards energy decarbonization to address the climate crisis. Sintering is one of the main sources of greenhouse gas emissions from steel mills. Traditional sintering processes use straight inclined chutes to feed raw materials into the sinter machine. However, this design suffers from insufficient horizontal momentum, resulting in poor segregation of the layered materials. This study proposes an improved charging chute design profile that uses a cycloid curve and rolls to enhance segregation, thus reducing coal consumption and increasing productivity. To achieve this, we first modeled a charging chute using the cycloid curve. Secondly, building upon the cycloid concept, we created a roll-type chute by strategically placing rollers along the cycloid trajectory. Finally, the cycloid roll-type charging chute, integrating the cycloid trajectory with the roll-shaped charging chute, was simulated. Pilot tests comparing the cycloid roll-type and straight chute models demonstrated a significant increase in dispersion for the cycloid roll-type design, with a 65% improvement in the Strand-ward segregation (Sw) index compared to the straight chute. Furthermore, actual filed implementation in a sintering process achieved a 2.9% increase in operational productivity and a 6% reduction in fuel consumption. This study is significant not only for proposing an optimal chute design, but also for successfully implementing it in a full-scale steel mill, contributing to a reduction in fuel consumption and carbon reduction in steel mills.

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