Fissure formation in coke. 1: The mechanism of fissuring

Jenkins, David R.; Mahoney, Merrick R.; Keating, Jack

doi:10.1016/j.fuel.2009.08.005

Cited by 22 publications

(12 citation statements)

References 24 publications

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“…19 and that the number of cracks decreased with increasing distance from the heated wall. The results are comparable to Jenkins et al 8) who theoretically and experimentally showed that the spacing of the major fissure in the coke oven was narrow around the heated wall but widen as the distance from the wall increased. Our numerical result qualitatively reflected their feature.…”

Section: Resultssupporting

confidence: 88%

“…Numerical analysis through models such as the finite element method (FEM) have been widely used to simulate the mechanical response of the coke, 6,[11][12][13] and for thermal stress analyses. 8,[14][15][16][17][18] Sato et al, 16) Goto et al 17) and Jenkins et al 8) performed the thermal stress analyses of coke models with major fissures using FEM and investigated the mechanism for the formation of fissures and factors that influence their spacing. However, although the shape of fissures that develop in coke during carbonization is generally complex, only linear major fissures were considered in the previous study.…”

Section: Development Of Analytical Methods Of Predicting Fissures Formation For Carbonization Process Of Cokementioning

confidence: 99%

“…The fissures are formed during the carbonization process, and their number and spacing determines the size of the coke. [8][9][10] Therefore, it is important in the coke making process to have a prediction technique for fissure initiation and propagation.…”

Section: Introductionmentioning

confidence: 99%

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Development of Analytical Method of Predicting Fissures Formation for Carbonization Process of Coke

et al. 2020

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The development of a numerical method for fissure formation during the carbonization of coke is needed because the formed fissures determine the coke's particle size. In this study, we proposed and developed a novel numerical method that can represent initiation, extension, and branching of multiple cracks. Fundamental tests (i.e., bending of a beam, stress analysis of a center crack plate, and crack propagation in a plate under tensile loading) were performed using the proposed method. The test results showed that the numerical accuracy of stress analysis and the fracture analysis using the proposed method were high and were comparable to other standard numerical methods. Furthermore, we applied the proposed method for the coupled analysis of heat conduction and thermal stress and performed numerical simulations for the formation of fissures in coke during carbonization. The numerical simulation results showed that major fissures extended in a linear direction, perpendicular to the direction of an oven wall. And the numerical results reflected qualitative features of an actual coke-making process using a chamber oven. Therefore, the proposed method could be used to reproduce the formation of fissures in coke during the carbonization process.

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Section: Resultssupporting

confidence: 88%

Section: Development Of Analytical Methods Of Predicting Fissures Formation For Carbonization Process Of Cokementioning

confidence: 99%

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Development of Analytical Method of Predicting Fissures Formation for Carbonization Process of Coke

et al. 2020

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“…1) The shrinkage ratio of coal affects the size of coke, and the coke size becomes smaller as the shrinkage ratio of coal increases. [2][3][4] This is because large thermal stress is developed and many cracks are generated during the carbonization process when coal with a large shrinkage ratio is used. [3][4][5] Hence, when the factor that determines the amount of contraction in coals during carbonization is clarified, the size of coke can be controlled.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Effect of Inert Components on the Shrinkage Phenomenon of Coke

et al. 2019

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The effect of inert components in coke on the shrinkage ratio of coke was numerically investigated. The carbonization process of semi-coke was simulated by using the finite element method. Coke models with a coke matrix, pores, cracks, and/or inert components were used. The numerical results using a coke model composed of a coke matrix and pores indicated that pores did not affect the shrinkage behavior of semi-coke. In addition, cracks did not affect the shrinkage behavior. On the other hand, from a numerical simulation using a coke model with inert components, the addition of inert components decreased the shrinkage ratio of coke. When the inert components were added, the elastic modulus of the inert components, viscosity of the matrix of semi-coke, and size of the inert components affected the shrinkage ratio. Furthermore, cracks extending from the inert component drastically decreased the shrinkage ratio of coke because the thermal stress around the interface between the matrix and inert components opened the crack.

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“…The shrinkage of coal during the process of heat treatment affects its pore structure [18], reactivity [19], crack formation [20,21], strength [22] and size distribution [23], which has a direct relationship with gasification characteristics of carbonized briquettes. Recently, the research of powdered coal used to make carbonized briquettes for the gasification industry has increased.…”

Section: Introductionmentioning

confidence: 99%

Shrinkage kinetics of large-sized briquettes during pyrolysis and its application in tamped coal cakes from large-scale chambers

Wang

Zhao

Zhang

2014

Fuel

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Fissure formation in coke. 1: The mechanism of fissuring

Cited by 22 publications

References 24 publications

Development of Analytical Method of Predicting Fissures Formation for Carbonization Process of Coke

Development of Analytical Method of Predicting Fissures Formation for Carbonization Process of Coke

Numerical Investigation of the Effect of Inert Components on the Shrinkage Phenomenon of Coke

Shrinkage kinetics of large-sized briquettes during pyrolysis and its application in tamped coal cakes from large-scale chambers

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