Discrete element study of solid circulating and resident behaviors in an internally circulating fluidized bed

Yang, Shiliang; Luo, Kun; Fang, Mingming; Fan, Jianren; Cen, Kefa

doi:10.1016/j.cej.2014.03.032

Cited by 16 publications

(3 citation statements)

References 35 publications

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“…Kawaguchi et al expanded it into the 3D coordinates. The method has been widely used to study dry particles in circulating fluidized beds, bubbling fluidized beds, downer reactors, vibrating beds, risers, and fixed bed reactors . For wet particle systems, Muguruma et al presented a numerical investigation of mono‐sized spherical particle flows with a small amount of water in a centrifugal tumbling granulator.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on a bubbling fluidized bed with wet particles

Wang

Tang

et al. 2016

AIChE Journal

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As liquid bridge between particles acts an important role in the particle system, it is of considerable significance to analyze the flow hydrodynamics of wet particles in fluidized beds, which will improve the reactor design and process optimization. Thus, experimental and numerical investigations on wet particles in a bubbling fluidized bed are conducted in current work. On experimental side, particle image velocimetry (PIV) technology is employed with a designed bubbling fluidized bed. The silicone oil is used in this work because it is nonvolatile and transparent. On numerical side, a modified discrete element method (DEM) numerical method is developed by compositing an additional liquid‐bridge module into the traditional soft‐sphere interaction model. Most of the physical parameters are chosen to correspond to the experimental settings. Good agreements of particle velocity are found between the DEM simulation and PIV measurement. The performance of different liquid contents and superficial gas velocities are examined. © 2016 American Institute of Chemical Engineers AIChE J, 62: 1970–1985, 2016

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on a bubbling fluidized bed with wet particles

Wang

Tang

et al. 2016

AIChE Journal

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“…It is known that the geometric configuration of the apparatus has a significant influence on the hydrodynamics and heat‐transfer properties . In the current study, different values of NJ , i.e., single, double, and triple jet, of the spouted bed are simulated under the U f = 3.0 U mf condition.…”

Section: Resultsmentioning

confidence: 99%

Effect of Operating Parameters on Gas‐Solid Hydrodynamics and Heat Transfer in a Spouted Bed

et al. 2019

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Through a combined computational fluid dynamics and discrete element method approach, the effect of the operating parameters on the hydrodynamics and heat‐transfer properties of gas‐solid two‐phase flows in a spouted bed are extensively investigated. Considering the high velocity in the fountain region, gas turbulence is resolved by employing the large‐eddy simulation. The rolling friction model is adopted for more precise predictions of solid behavior near the wall. Subsequently, the gas‐solid flow patterns, gas‐solid velocities, and temperature evolution are investigated. Moreover, different operating conditions and geometry configurations are evaluated with respect to heat‐transfer performance. The results provide a fundamental understanding of heat‐transfer mechanisms in spouted beds.

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“…In [15], an analytical prediction of the particles flow has been obtained for the specific case of rolling-mode operated drums. Discrete Element Method (DEM) has been increasingly used for predicting particles movement in rotating drums [16][17][18][19][20][21][22], following the breakthrough of higher computing power. Its undoubted advantage respect to other methods like stochastic or empirical is the possibility of obtaining a deterministic estimation of the trajectory of each particle.…”

Section: Introductionmentioning

confidence: 99%

A Discrete-Continuous Method for Predicting Thermochemical Phenomena in a Cement Kiln and Supporting Indirect Monitoring

Copertaro¹,

Chiariotti²,

Donoso³

et al. 2018

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Thermochemical phenomena involved in cement kilns are still not well understood because of their complexity, besides technical difficulties in achieving direct measurements of critical process variables. This article addresses the problem of their comprehensive numerical prediction. The presented numerical model exploits Computational Fluid Dynamics and Finite Difference Method approaches for solving the gas domain and the rotating wall, respectively. The description of the thermochemical conversion and movement of the powder particles is addressed with a Lagrangian approach. Coupling between gas, particles and the rotating wall includes momentum, heat and mass transfer. Three-dimensional numerical predictions for a full-size cement kiln are presented and they show agreement with experimental data and benchmark literature. The quality and detail of the results are believed to provide a new insight into the functioning of a cement kiln. Attention is paid to the computational burden of the model and a methodology is presented for reducing the time-to-solution and paving the way for its exploitation in quasireal-time, indirect monitoring.

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Discrete element study of solid circulating and resident behaviors in an internally circulating fluidized bed

Cited by 16 publications

References 35 publications

Experimental and numerical study on a bubbling fluidized bed with wet particles

Experimental and numerical study on a bubbling fluidized bed with wet particles

Effect of Operating Parameters on Gas‐Solid Hydrodynamics and Heat Transfer in a Spouted Bed

A Discrete-Continuous Method for Predicting Thermochemical Phenomena in a Cement Kiln and Supporting Indirect Monitoring

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