Hydrodynamics of expanded bed adsorption studied through CFD-DEM

Nijssen, Tim M.J.; Padding, JT Johan; Ottens, Marcel

doi:10.1016/j.ces.2023.119027

Cited by 7 publications

(3 citation statements)

References 66 publications

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“…As the IR-QFBP is the key equipment in the whole process, we mainly focused on the characteristics of IR-QFBP in this work. The cold flow models under ambient conditions are widely applied to study the fluid dynamics for a new system [29,[38][39][40]. And the hydrodynamic characteristics of IR- The main content of the new idea is to pyrolyze low-rank pulverized coal through a coal pyrolysis reactor (IR-QFBP), and the pyrolysis products are the raw gas (gas and gaseous tar mixture at high temperature) and coke.…”

Section: Introductionmentioning

confidence: 99%

“…As the IR-QFBP is the key equipment in the whole process, we mainly focused on the characteristics of IR-QFBP in this work. The cold flow models under ambient conditions are widely applied to study the fluid dynamics for a new system [29,[38][39][40]. And the hydrodynamic characteristics of IR-QFBP system are the bases of modeling and designing of a hot reactor.…”

Section: Introductionmentioning

confidence: 99%

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Fluid Dynamics Investigation in a Cold Flow Model of Internal Recycle Quadruple Fluidized Bed Coal Pyrolyzer

Cao,

Yu,

Wang

et al. 2024

Processes

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Internal recycle quadruple fluidized bed pyrolyzer (IR-QFBP) consists of a dual fluidized bed pyrolyzer and a dual fluidized bed combustor and is proposed in this work. It is a new kind of efficient fluidized bed with high pyrolysis and energy efficiency. IR-QFBP may attract extensive attention because of its compact structure. Cold hydrodynamic characteristics of IR-QFBP are the bases of modeling and designing for the hot one. To fully understand the hydrodynamic characteristics of IR-QFBP, a cold flow model on a laboratory scale was designed and set up; furthermore, the two-fluid model (TFM) based simulation was also carried out. The pressure profiles, fluidization states, velocity profiles, and circulation rates of a solid powder at different operation conditions in IR-QFBP were investigated. The results showed that the stable internal circulation of solid powder can be achieved in IR-QFBP. And different circulation characteristics can be obtained by adjusting the operating conditions.

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Section: Introductionmentioning

confidence: 99%

“…As the IR-QFBP is the key equipment in the whole process, we mainly focused on the characteristics of IR-QFBP in this work. The cold flow models under ambient conditions are widely applied to study the fluid dynamics for a new system [29,[38][39][40]. And the hydrodynamic characteristics of IR-QFBP system are the bases of modeling and designing of a hot reactor.…”

Section: Introductionmentioning

confidence: 99%

Fluid Dynamics Investigation in a Cold Flow Model of Internal Recycle Quadruple Fluidized Bed Coal Pyrolyzer

Cao,

Yu,

Wang

et al. 2024

Processes

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“…Among these two coupling methods, Yu's research group tended to insist that the first coupling relationship be able to more reasonably reflect the true bidirectional strong coupling relationship between particles and fluid [9,11,12]. In recent two years, most CFD-DEM simulations [13][14][15][16][17][18][19] published in the renowned journal, Chem. Eng.…”

Section: Introductionmentioning

confidence: 99%

Decoupling Interaction for CFD-DEM Simulations of Bubbling Fluidized Bed

Li,

Wang,

2024

Preprint

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The discrete element method (DEM) coupled with computational dynamics (CFD) has been considered one of the most sensitive ways of studying fluidized beds. This paper presents gas-solid fluidized bed simulations by use of CFD-DEM. The two-phase interaction is calculated in a way of decoupling. Within the effective neighborhood of the particles, the kernel approximation method is used to calculate the local porosity, thereby calculating the drag force on the particles. At the grid scale, the momentum exchange coefficient is calculated using a two fluid model based method, thereby calculating the source term of the phase interaction in the fluid control equation. The simulated form, size and motion process of the big bubble are all consistent with experimental observations. The simulated solid volume fraction and relative pressure averaged in a horizontal plane at 45 mm above the bottom are in reasonable agreement with the experimental data. The fluctuation of the simulated bed height over time is similar to the experimental measurement results. The reproduction of these qualitative and quantitative results indicates that the proposed method effectively improves simulation performance and accuracy.

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