Physical degradation of coke in blast furnace.

Okuyama, Yasuo; Miyazu, Takashi; Kishimoto, Sumiyuki

doi:10.2355/isijinternational1966.25.302

Cited by 3 publications

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“…a catalytic effect on the reactivity of coke [20]. The physical degradation process of coke in the BF was reported by Yasuo Okuyama et al, and the study showed that coke was severely degraded at 3~5m above tuyere, and the degradation of coke was also aggravated by Si, Ca and P compounds [21]. In addition, the gasification reaction characteristics of coke with CO 2 were studied by Wei Huo [22,23] and Juliana G. Pohlmann [24].…”

Section: B (2019) 371 -380mentioning

confidence: 93%

Protective mechanism of unburned pulverized coal to coke in blast furnace

Xiang

Shen

Jiang

et al. 2019

J min metall B Metall

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The edge and internal morphology of coke with different contents of UPC (unburned pulverized coal) after reaction with CO 2 were analyzed by SEM. The influence of UPC on CRI (coke reactivity)，CSR (coke strength after reaction) and apparent porosity was also studied. The synthetic weighted mark method was used to analyze the comprehensive effect of UPC content on coke quality. The results show that because of the decrease of the content of intermediates C f (O) and C(O)C f (O) the restrictive step between the coke and CO 2 is an interfacial chemical reaction, and it accords with the Mckewan equation 1-(1-α) 1/3 =kt. The UPC has a strong effect on coke when the content of UPC is 10~20%; meanwhile , the CRI and the apparent porosity are significantly decreased by 6.8% and 9.5%, respectively, and the CSR is significantly increased by 3.8%. The UPC can effectively reduce the effect of CO 2 on the edge and the internal erosion of coke; the large pores and the pulverization of coke were avoided. The results of the synthetic weighted mark method showed that the comprehensive quality of coke changed greatly when the content of unburned pulverized coal was 11.24~20.87%, which is in agreement with the experimental results.

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Section: B (2019) 371 -380mentioning

confidence: 93%

Protective mechanism of unburned pulverized coal to coke in blast furnace

Xiang

Shen

Jiang

et al. 2019

J min metall B Metall

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“…Segundo Okuyama et al [6], resultados obtidos a partir de dissecação de altos-fornos mostraram que há uma redução considerável no tamanho médio do coque (cerca de 50%), bem como uma redução na resistência a frio desse material à medida que o mesmo desce pelo alto-forno.…”

Section: Degradação Mecânica Do Coque Em Testes De Tamboreamentounclassified

“…Segundo Okuyama et al [6], o teste de tamboreamento é um método muito útil para a medição da resistência de materiais heterogêneos, como o coque.…”

Section: Degradação Mecânica Do Coque Em Testes De Tamboreamentounclassified

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Degradação Mecânica Do Coque Em Testes De Tamboreamento

Silva¹,

Silva²,

Assis³

et al. 2017

Tecnologia Em Metalurgia Materiais E Mineração

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ResumoEsse estudo avaliou a resistência mecânica a frio do coque, utilizando pequenas quantidades (300 a 1200 g) desse material, como alternativa aos testes usuais que utilizam 10 e 50 kg de coque. Para isso, as degradações volumétrica e superficial foram avaliadas em um tambor de menores dimensões (Diâmetro: 268 mm, comprimento: 470 mm), bem como no tambor especificado pela norma JIS K2151 (1,5 x 1,5 m). Para o equipamento menor encontrou-se que a taxa de degradação superficial (K) aumenta ligeiramente com a massa tamboreada. O fator de maior relevância foi a velocidade de rotação do tambor, que variou de 24 a 85 rpm. Nesse caso, K decresce com a velocidade. Embora a 24 rpm a taxa de degradação superficial tenha sido alta, a quebra volumétrica não ocorreu de forma relevante, sendo que essa ocorreu somente acima de 45 rpm. No tambor maior obteve-se uma maior degradação, em comparação com o tambor menor. Entretanto, há uma boa correlação entre a degradação nos dois equipamentos, possibilitando obter funções para se estimar a degradação que seria obtida no tambor maior mediante a degradação observada no tambor menor, ou seja, é possível avaliar a degradação do coque utilizando pequenas quantidades desse material. Palavras-chave: Degradação mecânica do coque; Teste de tamboreamento; Resistência mecânica a frio do coque. MECHANICAL DEGRADATION OF COKE IN DRUM TEST AbstractThis study aims to evaluate the coke's cold strength using small sample mass (300 to 1200g) in alternative to the usual tests which use 10 to 50 kg of coke . For this objective the surface and volume breakage were evaluated in a small drum (268 mm in diameter and 470 mm in length) as well as in the drum specified by the regulation JIS K2151 (1.5 m in diameter and 1.5 m in length). For the small equipment it was found that the surface breakage rate constant (K) slightly increases with the mass tumbled. The most relevant factor was the drum rotation speed that varied from 24 to 85 rpm. In this case, K decreases as speed decreases too. Although at 24 rpm this surface breakage was high, the volume breakage did not occur relevantly, and this happened only above 45 rpm. When the tumbling was conducted in a bigger drum (1.5 m x 1.5 m), it was obtained a higher degradation, comparing to the smaller drum. However, there is a close relationship between the degradation in both drums, allowing to obtain functions that correlate degradation observed in the smaller drum, that is, it is possible to evaluate the coke's degradation using small quantities of this raw material. Keywords: Mechanical coke breakage; Drum test; Coke's cold strength. INTRODUÇÃOA maior parte da produção de aço no mundo está vinculada à redução de uma carga em alto-forno (AF) a coque [1], sendo esse o insumo com maior impacto no custo do ferro gusa [2]. Fatores como a exigência de coque que atenda às demandas cada vez mais restritas do AF a partir de fontes de menor qualidade, logo mais baratas,

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Deadman Behavior and Slag–Iron–Coke Interaction of Low Carbon and Safety Blast Furnace: A Review

Zong,

Guo,

Zhang

et al. 2024

steel research int.

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The elucidation of the deadman's behavior and the interaction between slag–iron–coke within the blast furnace hearth are essential for the realization of low‐carbon and safe production. In this review, the macrostate of the deadman, the interactions between slag–iron–coke, carburizing behaviors, and renewal mechanisms are comprehensively examined. First, the formation and state of the deadman, voidage, and the distribution of coke sizes within the blast furnace hearth are characterized. The average coke particle size ranges from 20 to 30 mm, and the deadman void fraction of 30–50%. Second, the interaction between slag–iron–coke as well as the occurrence state of the mineral layer at the interface within the deadman is elucidated. The ash composition and content of coke are the key factors affecting the slag–iron–coke interaction and interface phase composition. Third, the influence exerted by critical factors such as the physical properties of the carbon source, molten iron, and temperature on the carburizing behavior are analyzed, with the renewal mechanisms of the deadman also being disclosed. Finally, three future focal areas are proposed: characterization and intelligent monitoring of deadman permeability, analysis of slag–iron–coke properties and interface mineral layers control, and in‐depth analysis of deadman renewal and carbon carburization in molten iron. It is anticipated that the studies will enhance the comprehension of deadman behavior and the interactions between slag–iron–coke, thereby fostering the blast furnace's sustainable development.

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Physical degradation of coke in blast furnace.

Cited by 3 publications

References 0 publications

Protective mechanism of unburned pulverized coal to coke in blast furnace

Protective mechanism of unburned pulverized coal to coke in blast furnace

Degradação Mecânica Do Coque Em Testes De Tamboreamento

Deadman Behavior and Slag–Iron–Coke Interaction of Low Carbon and Safety Blast Furnace: A Review

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