Effect of Blast Furnace Profile on Inner Furnace States

Inada, Takanobu; Takata, Kouzo; Takatani, Kouji; Yamamoto, Tomokazu

doi:10.2355/isijinternational.43.1003

Cited by 22 publications

(8 citation statements)

References 5 publications

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“…As seen from the figure, despite of the changing parameters, the solid temperature gradually decreases from the centre region to the peripheral region, which is dominated by the burden distribution in the furnace. is is in line with the previous studies [55,56]. e figures show that the upper furnace temperature is increased for BF with HGI of CO regardless of the HGI position, rate, and temperature.…”

Section: Parametric Study Of Hgi Of 100% Co Into Bfsupporting

confidence: 93%

“…As an example, Figures 2(a) and 2(b), respectively, show the porosity distributions and enlarged CZ profiles in the BF without HGI and with HGI of 100% CO both before and after coke reduction. It is shown that inverse V-shaped CZs are obtained in all the operations, which is mainly controlled by the burden distribution pattern and hence porosity distribution [55,56]. However, the CZ position rises significantly due to the HGI of 100% CO. is suggests that there is excessive energy in the BF with HGI of 100% CO before coke reduction.…”

Section: Terms Formulationmentioning

confidence: 94%

“…As seen from the figure, for all the operations, the solid temperature is higher in the centre region and gradually decreases to the peripheral region, as affected by the centre developed burden distribution. Hence, the temperature profile in the furnace is not significantly affected by HGI but still dominated by the burden distribution patterns [55,56]. Compared with the BF without HGI, the solid temperature is higher in the upper furnace with HGI regardless of the injection composition, which suggests that heat energy is supplied to the upper furnace and HGI operations result in more severe cooling losses of heat from the wall [57].…”

Section: Effects Of Hgi Compositionmentioning

confidence: 98%

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Computational Study of Hot Gas Injection (HGI) into an Ironmaking Blast Furnace (BF)

Feng

Wang

2021

Mathematical Problems in Engineering

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Blast furnace (BF) ironmaking is the most important process that produces hot metal (HM) from iron-bearing materials continuously, rapidly, and efficiently. To date, the process is considered to have reached its limit in view of the achieved high process efficiency. In addition, the required high-quality materials are expensive and gradually getting depleted. Hot gas injection (HGI) into the shaft of the BF is an emerging technology recognized potential to solve the aforementioned problems. However, so far, limited information and studies are available, most of which are preliminary studies with regard to the feasibility and aerodynamics of the technology. This hindered the understanding and thus the effective use of this technology. This work presents a numerical study of the multiphase flow, heat, and mass transfer in a BF by a CFD-based process model. The effects of injection composition in terms of CO and CO2 contents in HGI are studied first. The calculated results reveal that HGI of 100% CO delivers the best BF performance. Then, the effects of key variables in relation to HGI of 100% CO, including position, rate, and temperature, are systematically studied. The in-furnace states and overall performance parameters have been analysed in detail. The results show that, through appropriate control of the injection variables, it is possible to achieve improved BF performance including low fuel rate and high productivity, which are considerably affected by the HGI parameters. The BF process model is also demonstrated to be a cost-effective tool in optimizing the key variables of HGI in BF for obtaining optimum process efficiency.

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Section: Parametric Study Of Hgi Of 100% Co Into Bfsupporting

confidence: 93%

Section: Terms Formulationmentioning

confidence: 94%

Section: Effects Of Hgi Compositionmentioning

confidence: 98%

See 1 more Smart Citation

Computational Study of Hot Gas Injection (HGI) into an Ironmaking Blast Furnace (BF)

Feng

Wang

2021

Mathematical Problems in Engineering

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“…Note that the increased gas pressure intensifies the drag force exerting on solid particles and thus enhances the chance of operation instability resulting from various deleterious phenomena such as hanging, flooding, and channeling. [47] The current results suggest that the increase of gas pressure should be attributed to two reasons: (1) the deteriorated gas permeability in the lumpy zone, and (2) the longer CZ that often exerts a considerable resistance on the ascending gas flow. When the RDI equals the critical value of 5, the gas pressure only increases slightly compared to the base case, corresponding to the size degradation in Figures 10 and 11.…”

Section: B Effect Of Rdimentioning

confidence: 69%

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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“…Seu princípio fundamental é reduzir os minérios ferrosos pela passagem de um elemento redutor em contra corrente, que será o CO ou H2. Já a estrutura interna do alto-forno bem como o perfil de movimentação da carga tem sido estudada desde o inicio do século XX [2]. Durante os anos subsequentes técnicas operacionais tais como controle da temperatura de sopro, enriquecimento de oxigênio, pressões de operação, prétratamento de matéria prima, injeção de combustíveis auxiliares entre outras, vem sendo desenvolvidas com o objetivo de aumentar a produtividade desse equipamento [3].…”

Section: Introductionunclassified

Evolução Do Projeto De Refrigeração Para Ventaneiras Utilizando Simulação CFD

Maia¹,

Santos²,

Garajau³

et al. 2014

ABM Proceedings

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ResumoA constante busca por aumento de produtividade aliada à redução de custos com paradas para manutenção nos altos-fornos tem exigido incessantes evoluções tecnológicas em seus equipamentos. As ventaneiras são equipamentos de vital importância para o processo de redução do minério de ferro, e um importante parâmetro para um bom desempenho em processo é seu projeto de refrigeração. Tendo em vista que a otimização da refrigeração pode aumentar a vida do equipamento e reduzir custos com manutenções, o presente trabalho apresentará um estudo de evolução no projeto de refrigeração de ventaneiras com câmaras de refrigeração independente no mesmo corpo (câmaras interna e externa). Esta evolução tem como objetivo principal permitir a utilização da câmara interna mesmo após a falha da câmara externa, devido a sua refrigeração independente e otimizada, com aumento na vida útil do equipamento. A comparação destes projetos será feita utilizando ferramentas de simulação computacional CFD e os resultados serão apresentados na conclusão do trabalho.

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Effect of Blast Furnace Profile on Inner Furnace States

Cited by 22 publications

References 5 publications

Computational Study of Hot Gas Injection (HGI) into an Ironmaking Blast Furnace (BF)

Computational Study of Hot Gas Injection (HGI) into an Ironmaking Blast Furnace (BF)

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

Evolução Do Projeto De Refrigeração Para Ventaneiras Utilizando Simulação CFD

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