Modeling and Analysis of Heat Transfer in Deforming Packed Bed

Nogami, Hiroshi

doi:10.2355/isijinternational.isijint-2019-825

Cited by 2 publications

(3 citation statements)

References 42 publications

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“…In the packed bed, the gas flows non-uniformly. Several gas flow simulations in packed beds 23,24,27,29,30) showed that the gas flow concentrated to fairly thicker flow channels rather than passing through thinner void space. Therefore, it is important to extract the flow channel structure formed in the packed bed.…”

Section: Flow Paths In Packed Bedmentioning

confidence: 99%

“…In recent year, several analyses of the fluid flow in the void space in the packed bed have been performed. [22][23][24][25][26][27][28][29][30] The shape of the void space is reflected to the computational grids. Therefore, the effects of the shape and the connection of the void space are automatically reflected to the flow behavior and the pressure drop.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Void Structure in Deforming Packed Bed of Mono-dispersed Spherical Particles

Nogami

Yamawaki

2020

ISIJ Int.

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The void structure in the deforming packed bed like cohesive zone of blast furnace was discussed. The examined packed bed consisted of mono-dispersed spherical particles and was numerically prepared by using the discrete element method. From the obtained packing particle structure, the characteristics of the void space, namely voidage, surface area, hydraulic radius, flow path network structure, width and length of the flow path, were extracted. The actual hydraulic radius deviated from the one calculated from the bed shrinkage with the bed deformation, and this deviation resulted the large difference in the pressure drop in the packed bed. The flow path (void) network was successfully extracted from the particle packing structure. Additionally, distributions of the path width and length were obtained. The choking of flow path with bed shrinkage can be quantitatively visualized. In the softening ore particle bed with nut coke mixing, the flow path structures around ore and nut coke particles showed different behavior. With the obtained characteristics of the void structure, the variations of the pressure drops in the reduction test under loading and in the softening ore layer with coke mixing can be explained.

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Section: Flow Paths In Packed Bedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Void Structure in Deforming Packed Bed of Mono-dispersed Spherical Particles

Nogami

Yamawaki

2020

ISIJ Int.

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“…Additionally, a slip between surfaces of the contacting particles is expressed by a frictional slider. 59) The last term F D in Eq. ( 1) is drag force receiving from the gas flow, which is explained in the section 2.3.…”

Section: Particle Motionmentioning

confidence: 99%

Numerical Analysis of Raceway Formation in Isothermal and Non-reactive Packed Bed

et al. 2020

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Raceway zone is one of the most important regions in blast furnace, since it governs efficiency and stability of the blast furnace process through combustions of coke and auxiliary reducing agent, burden descent, fines generation, and so on. Therefore, quantitative understanding of the raceway behavior is indispensable to designing and realizing highly efficient operation of blast furnace. In the raceway, a cavity is formed and the coke particles circulate due to interaction between particles and high velocity blast gas, and consumption of coke. Thus, two-phase flow behavior is one of the key features of the raceway formation. In this study, the formation behavior of the raceway in the isothermal and non-reactive packed bed was numerically discussed from the viewpoint of two-phase flow. The mathematical model used in this study consisted of Lagrangean particle tracking method and Eulerian computational fluid dynamic technique, and these were combined through voidage distribution and momentum exchange. This model was applied to a small-scale cold-model condition. The simulation results revealed the raceway formation behavior such as variations of cavity size, particle motion, gas flow field, and contact force network. Furthermore, the effects of the initial packing structure on the raceway formation, the differences in the raceway formation behavior in the fixed bed and the moving bed and their mechanisms were clearly elucidated.

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Modeling and Analysis of Heat Transfer in Deforming Packed Bed

Cited by 2 publications

References 42 publications

Analysis of Void Structure in Deforming Packed Bed of Mono-dispersed Spherical Particles

Analysis of Void Structure in Deforming Packed Bed of Mono-dispersed Spherical Particles

Numerical Analysis of Raceway Formation in Isothermal and Non-reactive Packed Bed

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