Reaction model and reaction behavior of carbon composite briquette in blast furnace

Tang, Huiqing; Sun, Yanjun; Tu, Rong; Guo, Zhen

doi:10.1016/j.powtec.2020.09.034

Cited by 11 publications

(11 citation statements)

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“…2 and detailed elsewhere. 40) For a given cell, the solid-phase streamline through the cell is determined after the BF model reaches a primary convergence (Fig. 2(a)).…”

Section: Solution Strategymentioning

confidence: 99%

Numerical Simulation of Charging Biochar Composite Briquette to Blast Furnace

2022

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Partial replacement of coal and coke by biomass/biochar in the blast furnace (BF) ironmaking is important role to reduce CO 2 emissions. In this research, numerical investigations were conducted on blast furnace (BF) operation with biochar composite briquette (BCB) charging. The BCB was with 11.1 mass% carbon, 72.7 mass% magnetite, 11.25 mass% wustite, 0.77 mass% metallic iron, and 4.67 mass% gangue, and the BCB charging ratio was from 0 to 60% Results revealed that in the BF operation with BCB charging, the BCB iron-oxide reached a full reduction, but the overall gasification degree of BCB biochar decreased with the increase of BCB charging ratio. By charging BCB, the thermal state in the upper BF was considerably altered, but it was insignificantly influenced in the lower BF. By charging BCB; ore reduction was retarded in the upper BF but was prompted near the zone with a temperature of 1 173 K. Under a low BCB charging ratio, local gas utilization tended to increase in the mid BF but tended to decrease in the upper BF. Further increasing BCB charging ratio lead to a decrease in local gas utilization. To ensure BF smooth running and maximizing biochar input, the optimal BCB charging ratio was 40%. Under this condition, the BCB biochar of 89.3 kg/tHM could be completely utilized, and the BF coke rate was decreased by 92.1 kg/tHM.

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“…2 and detailed elsewhere. 40) For a given cell, the solid-phase streamline through the cell is determined after the BF model reaches a primary convergence (Fig. 2(a)).…”

Section: Solution Strategymentioning

confidence: 99%

Numerical Simulation of Charging Biochar Composite Briquette to Blast Furnace

2022

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“…The CCB model developed by Tang et al [34] was used in this research. The following is a brief introduction of the CCB model.…”

Section: Ccb Modelmentioning

confidence: 99%

“…The Lagrangian method to adjust the rates of Equations ( 6)-( 9) in Table 3 is illustrated in Figure 2 and detailed elsewhere [34]. For a given cell, the solid-phase streamline through the cell is determined after the BF model reaches a primary convergence Figure 2a.…”

Section: Solution Strategymentioning

confidence: 99%

“…During the heating, its self-reduction and Equations with BF gas proceed. Under the BF environment, changes in CCB volume and porosity become obvious with the increase of temperature [34,36]. Therefore, compared to the isothermal tests, the nonisothermal tests under simulated BF environment are more suitable to determine the CCB model parameters.…”

Section: Determination Of Parameter In Ccb Modelmentioning

confidence: 99%

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Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace

Wang

Tang

et al. 2021

Metals

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In the present research, charging carbon composite briquettes (CCB) in a blast furnace (BF) was investigated. The CCB used contained 29.70 wt.% Fe3O4, 39.70 wt.%, FeO, 1.57 wt.% iron, 8.73 wt.% gangue, and 20.30 wt.% carbon. Its reaction kinetics in BF was examined by nonisothermal tests and modeled. Thereafter, the influence of replacing 10% ore with CCB on BF performance was studied by numerical simulations. Results showed that the CCB reaction behavior in BF could be modeled using the previously proposed model under ags = 1900 m2·m−3. Numerical simulations on a BF with a production of 6250t hot metal per day (tHM/day) showed that replacing 10% ore with CCB efficiently improved the BF operation for coke saving. In the CCB charging operation, the CCB reached a full iron-oxide reduction above the cohesive zone (CZ) and a carbon conversion of 85%. By charging CCB, the thermal state in the BF upper part was significantly changed while it was not influenced in the BF lower part; the ore reduction was retarded before the temperature reached 1073 K and was prompted after and the local gas utilization tends to increase above the CZ. By the CCB reduction above the CZ, BF top gas temperature was decreased by 8 K, the BF top gas utilization was increased by 1.3%, the BF productivity was decreased by 17 tHM/day, the coke rate was decreased by 52.2 kg/tHM, and ore rate was decreased by 101 kg/tHM. Considering the energy consumption of sintering and coking, charging the CCB could have a significant energy-saving and CO2-emission-reducing effect for BF iron making.

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“…Dentre os setores com contribuição na emissão desses gases, destaca-se a siderurgia (TANG et al, 2021). Segundo uma estimativa realizada em 2018, cerca de 1,85t CO2 é produzido para cada tonelada de aço produzido (WORLD STEEL ASSOCIATION, 2020).…”

Section: Introductionunclassified

Aplicação de resíduo de palma como fonte de carbono em briquetes autorredutores de minério de ferro.

Manfredi¹

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Agradeço aos meus pais, Fernanda e Edilson, meus irmãos, Caio e Leonardo, minha madrinha, Josefa, e às pessoas de minha família que me ajudaram, me incentivaram e estiveram sempre ao meu lado.A minha namorada, Renata, pela sua compreensão, apoio, contribuição e paciência com meus estudos. Demonstrando muita empatia, amor e dedicação, os quais serei sempre grato.Aos meus colegas de laboratório, Dennys, Franco, João, Lívia, Lucas, Luigi, Larissa, Mariana, Natália e Bárbara, por toda amizade, convívio e auxílio durante todo o período de mestrado.Um agradecimento especial ao Paulo, Luigi e Miguel que demonstraram imenso interesse, dedicação e altruísmo ao me ajudar com experimentos, solução de problemas e ideias para melhorar o projeto. Aos Prof. Dr. Jorge Tenório e ao Prof. Dr. Jorge Coleti, pela orientação, dicas, auxílio e fornecimento da oportunidade de realizar o mestrado.À USP e todos seus funcionários pela recepção e ajuda em tudo que foi necessário.À CAPES por conceder a bolsa de estudos.A todos que contribuíram, incentivaram e me acompanharam durante o período de realização desse trabalho. RESUMOO efeito estufa é um dos maiores desafios enfrentados pela sociedade contemporânea. Havendo indústrias que contribuem de forma significativa com esse fenômeno. Destacando-se a siderurgia, que gera 1,85t CO2/t de aço produzido. Paralelamente, existe outro problema em relação ao descarte inadequado e queima ao ar livre de resíduos agroindustriais, como o resíduo de palma, pode gerar gases poluentes. O carvão produzido a partir dos resíduos da agroindústria pode ser utilizado como fonte de carbono na siderurgia, constituindo briquetes autorredutores. Pelo fato de a biomassa ser uma fonte neutra de CO2, essa rota de redução do minério de ferro contribui para a redução de emissão de dióxido de carbono. Além de realizar a valorização de resíduos agroindustriais. Assim, o objetivo dessa pesquisa foi avaliar a redutibilidade e a resistência dos briquetes, estudar a cinética e determinar os mecanismos controladores das reações que ocorrem durante a redução do minério de ferro. Para isso, as matérias-primas foram caracterizadas por fluorescência de Raios X, análise elementar de carbono e enxofre, microscopia eletrônica de varredura, difratometria de Raios X, perda ao fogo e análise granulométrica por difração a laser. Para o resíduo de palma, foram determinados os teores de umidade, voláteis, cinzas e o carbono fixo. Além disso, foram utilizados briquetes com 3 relações de C/O (carbono disponível para a redução/óxidos a ser removido dos óxidos de ferro), sendo de 0,8, 1,2 e 1,6. Esses briquetes foram caracterizados por difração de Raios X, análise de carbono e enxofre, determinação de densidade e porosidade. Posteriormente, os briquetes passaram por testes de resistência mecânica, por meio de teste de queda, compressão e tamboramento. Para o estudo cinético, o briquete foi reduzido em termobalança a 10, 20 e 30°C/min da temperatura ambiente até 1100°C. Por fim, para a determinação da redutibilidade, foram feitos ensaios em for...

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Reaction model and reaction behavior of carbon composite briquette in blast furnace

Cited by 11 publications

References 40 publications

Numerical Simulation of Charging Biochar Composite Briquette to Blast Furnace

Numerical Simulation of Charging Biochar Composite Briquette to Blast Furnace

Experimental and Numerical Investigations on Charging Carbon Composite Briquettes in a Blast Furnace

Aplicação de resíduo de palma como fonte de carbono em briquetes autorredutores de minério de ferro.

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