Influence of Structure and Mineral Association of Tuyere-Level Coke on Gasification Process

Sun, Minmin; Zhang, Jianliang; Li, Kejiang; Guo, Ke; Wang, Haiyang; Wang, Ziming; Jiang, Chunhe

doi:10.1007/s11663-018-1344-2

Cited by 15 publications

(4 citation statements)

References 20 publications

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“…The current experimental results indicated that the reaction performance and mechanical properties of coke mainly depend on its internal structure. – In experimental research, X-ray diffraction (XRD) or scanning electronic microscopy methods are often used to observe the internal pore size distribution and microstructure. – Lu et al confirmed that graphitized carbon indicates the main presence of carbon atoms in coke through X-ray photoelectron spectroscopy, which has a certain impact on the thermal properties of coke. Moreover, Sato et al analyzed and estimated the tensile stress of coke cracking in coke ovens, and the results showed that coke can withstand tensile stress up to 10–20 MPa .…”

Section: Introductionmentioning

confidence: 85%

Effect of Different sp² Bond Contents on the Reactivity and Mechanical Properties of Coke Carbon: A ReaxFF Molecular Dynamics Study

Xiong,

Li,

et al. 2023

ACS Omega

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In this study, ReaxFF-MD was used to construct a large-molecule model of coke containing 3000 atoms, and the sp2 bond content of the model was controlled by changing the heating and cooling rates. The increase of the sp2 bond content led to a significant difference in the reactivity of coke. The presence of the sp2 bond caused the carbon atoms inside the coke to change into a circular structure, making it more difficult for the gaseous atoms to adsorb on the surface of the coke. It significantly reduced the gasification reaction rate of coke in the CO2 and H2O atmospheres. In the tensile simulation experiment, it was found that the stretching process of coke was mainly divided into three stages: an elastic stretching stage, a plastic stretching stage, and a model fracture stage. During the stretching process, the carbon ring structure would undergo a C–C bond fracture while generating carbon chains to resist stress. The results indicated that the presence of sp2 bonds can effectively reduce the phenomenon of excessive local stress on coke to improve its tensile resistance. The method developed in this paper may provide further ideas and platforms for the research on coke performance.

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Section: Introductionmentioning

confidence: 85%

Effect of Different sp² Bond Contents on the Reactivity and Mechanical Properties of Coke Carbon: A ReaxFF Molecular Dynamics Study

Xiong,

Li,

et al. 2023

ACS Omega

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“…Up to now, the behavior and performance of the hearth deadman coke have not been directly observed and detected. The average service life of a blast furnace is more than 10 years. , The drilling core sampling is still the only efficient means to obtain the hearth deadman coke and systematically recognize the blast furnace during the blow-off process. Therefore, the understanding of the behavior of blast furnace coke is relatively limited at present, especially the graphitization of hearth coke and coke consumption pathway rate are still major concerns for iron-makers.…”

Section: Introductionmentioning

confidence: 99%

Graphitization and Performance of Deadman Coke in a Large Dissected Blast Furnace

et al. 2021

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The graphitization and performance of deadman coke in the blast furnace hearth have an essential influence on the longevity of the blast furnace. In this paper, coke samples were obtained from various heights in a hearth during the overhaul of the blast furnace. The voidage, particle size, graphitization degree, microstructure, and structure evolution of multiple cokes were analyzed through digital image processing, XRD, Raman spectra, scanning electron microscopy, and energy-dispersive X-ray spectroscopy (SEM-EDS). The graphitization results were compared with feed coke, tuyere coke, cohesive zone coke, and deadman coke in reference, and the main findings were analyzed. The following results were obtained. First, the voidage of deadman coke increased and then decreased with the increase of the depth while the particle size continued to decrease. In addition, the consumption rate of coke as a carburizer, reductant, and heart source was 8.47, 30.95, and 60.58%, respectively. Second, the graphitization degree of deadman coke was extremely high and showed a trend of first increasing and then decreasing. Finally, the evolution mechanism of coke graphitization was proposed. Molten iron, alkali metal, temperature, and mineral were the crucial factors that affect the graphitization of coke. The turning point of the graphitization degree was related to the buoyancy of the hearth.

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“…Owing to the complexity nature of the hearth environment (high temperature, high pressure, slag/iron/gas coexistence), it is difficult to sample the deadman below the tuyere level of the BF [14,15]. At present, samples can only be obtained by the dissection of the hearth during the overhaul of BF [16,17]. The coke in tuyere zone and hearth zone of the BF is the main analysis object because they are able to show a lot of information for BF operation [18,19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the microstructure interaction mechanism of coke–slag–metal in deadman of blast furnace

Sun

Zhang

et al. 2021

Ironmaking & Steelmaking

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Coke-slag-metal samples located near the deadman edge and below the taphole of blast furnace were obtained by core drilling after cooling. The chemical composition, microstructure, phase composition and distribution of samples were studied in detail. In addition, the graphitisation degree of coke in hearth was also investigated. The results showed that coke larger than 60 mm still existed (more than 1%). Pores in coke are filled with molten slag and a small part of liquid iron. The pores in hearth coke are not completely filled, but there is still plenty of micropore, with a volume of less than 1 mm 3 . There are also a little alkali metals (K and Na) in ash, which causes the deterioration of coke. The iron-carbon interface is covered by a slag layer. The coke remained in deadman long enough to undergo the graphitisation process.

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Influence of Structure and Mineral Association of Tuyere-Level Coke on Gasification Process

Cited by 15 publications

References 20 publications

Effect of Different sp² Bond Contents on the Reactivity and Mechanical Properties of Coke Carbon: A ReaxFF Molecular Dynamics Study

Effect of Different sp² Bond Contents on the Reactivity and Mechanical Properties of Coke Carbon: A ReaxFF Molecular Dynamics Study

Graphitization and Performance of Deadman Coke in a Large Dissected Blast Furnace

Investigation of the microstructure interaction mechanism of coke–slag–metal in deadman of blast furnace

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Influence of Structure and Mineral Association of Tuyere-Level Coke on Gasification Process

Cited by 15 publications

References 20 publications

Effect of Different sp2 Bond Contents on the Reactivity and Mechanical Properties of Coke Carbon: A ReaxFF Molecular Dynamics Study

Effect of Different sp2 Bond Contents on the Reactivity and Mechanical Properties of Coke Carbon: A ReaxFF Molecular Dynamics Study

Graphitization and Performance of Deadman Coke in a Large Dissected Blast Furnace

Investigation of the microstructure interaction mechanism of coke–slag–metal in deadman of blast furnace

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Effect of Different sp² Bond Contents on the Reactivity and Mechanical Properties of Coke Carbon: A ReaxFF Molecular Dynamics Study

Effect of Different sp² Bond Contents on the Reactivity and Mechanical Properties of Coke Carbon: A ReaxFF Molecular Dynamics Study