Reduction Degradation Behavior of Sinter in the Blast Furnace Shaft

Nakajima, Ryuichi; Sumigama, Takashi; Wakimoto, Kazumasa; Nagano, Seiki; Kawata, Hitoshi; Sakurai, Masaaki

doi:10.2355/tetsutohagane1955.73.15_1964

Cited by 12 publications

(9 citation statements)

References 1 publication

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“…As such, in the calculation of Eq. [5], the value of u R Ã at the burden surface is set to from 0 to 1 according to the locations of CFD cells. Then, the cells with the same value of u R Ã are considered to be on the same particle pathline.…”

Section: A Sinter Reduction Degradation Submodelmentioning

confidence: 99%

“…Iwanaga [4] carried out extensive experiments on the degradation of sinter during reduction and correlated the degree of size degradation with reduction parameters. Nakajima et al [5] carried out laboratory tests on the reduction degradation behavior of sinter under similar temperature conditions in a real BF. Wu et al [6] compared the reduction degradation characteristics of typical sinter, pellet and lump ore. Mizutani et al [7,8] investigated the reduction disintegration behavior that is induced by the H 2 reduction.…”

Section: Introductionmentioning

confidence: 99%

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CFD Modeling and Analysis of Particle Size Reduction and Its Effect on Blast Furnace Ironmaking

Jiao

Kuang

Liu

et al. 2020

Metall Mater Trans B

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Particle size reduction inevitably occurs inside ironmaking blast furnaces (BFs) but is not studied under BF conditions due to the lack of an effective tool. This paper simulates this phenomenon inside a 5000-m 3 commercial BF using a recently developed three-dimensional computational fluid dynamics (CFD) process model. In particular, the sinter reduction degradation and coke gasification are modeled for considering the size reduction. By incorporating this information in the BF model, the in-furnace states and global performance are evaluated with respect to sinter reduction degradation index (RDI) under different conditions, e.g., keeping a constant blast rate or gas pressure drop. The results show that with increasing RDI, the bed permeability deteriorates, and there exists a critical value of RDI beyond which the decreased bed permeability leads to a significant drop in productivity for a given gas pressure drop. However, this problem can be mitigated substantially by charging more coke particles at the furnace periphery under the conditions considered. The proposed approach offers an extended capability to model and control BF operations.

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Section: A Sinter Reduction Degradation Submodelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

CFD Modeling and Analysis of Particle Size Reduction and Its Effect on Blast Furnace Ironmaking

Jiao

Kuang

Liu

et al. 2020

Metall Mater Trans B

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“…The combustion and gasification behavior of waste plastics immediately just after injected into a blast furnace was examined by a high speed camera and gas sampling in a raceway using a raceway probe. 8) The in-furnace behavior during plastics injection was analyzed by gas sampling using a Feeding Type Vertical Probe (FVP) just over the tuyere with plastics injection. The main experimental conditions are listed in Table 1.…”

Section: Experimental Methodsmentioning

confidence: 99%

Development of Waste Plastics Injection Process in Blast Furnace.

et al. 2000

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At Keihin No. 1 Blast Furnace, waste plastics recycling system was installed in Oct. 1996. Before the installation of that system, the behavior of waste plastics injected into the blast furnace has been studied with the raceway hot model and the commercial blast furnace so as to investigate the possibility of effective waste plastics utilization in the blast furnace. From the observation of plastics particle injected into the raceway of blast furnace, it was estimated that combustibility of coarse plastics was much different from that of pulverized coal. The combustion point of coarse plastics located to deep domain in raceway compared with that of pulverized coal. Although C 1 -C 4 hydrocarbons due to the decomposition of plastics was detected in in-furnace, the decomposition products of plastics in the blast furnace top gas and dust were the same as that of pulverized coal injection. The preparation method of plastics had an influence on the combustion and gasification behavior in the raceway. The coarse plastics gave high combustion and gasification efficiency compared with fine plastics and pulverized coal, and CO 2 gasification rate of unburnt char derived from waste plastics was much higher than that of pulverized coal. Thus, it was concluded that coarse waste plastics could be effectively utilized as a reducing agent in the blast furnace. On the basis of above results, the waste plastics recycling system was designed.

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“…Many researchers have investigated the reduction degradation of sinter and its mechanism in reducing condition simulating traditional blast furnace (BF) process. The volumetric expansion generated by the reduction of hematite to magnetite was deemed as the main factor that causes reduction degradation [7][8][9]. Various elements and mineral phases composing the sinter have different effects on the low temperature reduction degradation performance of sinter, including the MgO content of sinter.…”

Section: Introductionmentioning

confidence: 99%

Influence of MgO on Low Temperature Reduction and Mineralogical Changes of Sinter in Simulated COREX Shaft Furnace Reducing Conditions

et al. 2019

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COREX (Coal-Reduction-Extreme) smelting reduction process provides a sustainable developing way for ironmaking industry, but the sources of iron ore materials restrict its development in China. Meanwhile, the application of sinter, which is marked by low manufacture cost and overcapacity in China, to COREX furnace faced proportion limitation due to its worse low temperature reduction degradation performance. This work explored the influence of MgO content on the low-temperature (550 °C) reduction of sinter in reducing conditions simulating COREX shaft furnace. The mineralogical change of sinter containing different content of MgO before and after reduction was analyzed by X-ray diffraction (XRD), optical microscopy, and scanning electron microscopy for revealing the action mechanism of MgO on the low-temperature-reduction of sinter. The results show that increasing MgO (1.36–3.10%) improved the low temperature reduction degradation performance of sinter, and decreased its reduction degree and reduction rate at low temperature. More MgO the sinter contained, less Fe2O3 and SFCA was observed in sinter. Meantime, less Fe2O3 was reduced and the generation of innerstress was restrained during reduction process. The improved RDI (reduction degradation index) in COREX process of sinter by increasing MgO content is a comprehensive result of lowering strength and inhibiting probable reduction of sinter.

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Reduction Degradation Behavior of Sinter in the Blast Furnace Shaft

Cited by 12 publications

References 1 publication

CFD Modeling and Analysis of Particle Size Reduction and Its Effect on Blast Furnace Ironmaking

CFD Modeling and Analysis of Particle Size Reduction and Its Effect on Blast Furnace Ironmaking

Development of Waste Plastics Injection Process in Blast Furnace.

Influence of MgO on Low Temperature Reduction and Mineralogical Changes of Sinter in Simulated COREX Shaft Furnace Reducing Conditions

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