Numerical simulation on gas-solid flow characteristics in a high-density countercurrent fluidized bed particle solar receiver

Jiang, Kaijun; Tian, Ziqian; Chen, Sheng; Xu, Chao; Du, Xiaoze

doi:10.1016/j.solener.2022.11.048

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…The vertical powder dryer has been widely applied in various fields such as the petrochemical industry, grain, and energy due to its advantages of high heat transfer efficiency, low energy consumption, high gassolid contact efficiency, and high product quality [1,2]. In the drying unit of a vertical powder dryer, particles move downward along the direction of gravity while gas moves upward against gravity, which is similar to a gas-solid counter-current downer [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Wet Particles Motion in a Vertical Powder Dryer

Yu,

Pang,

She

et al. 2024

FDMP

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In this study, the motion of wet particles in the drying unit of a vertical powder dryer is investigated by using a Discrete element method (DEM) coupled with a liquid bridge force. In particular, by varying parameters such as the particle mass flow rates, the superficial gas velocities, and superficial gas temperatures, the influence of the moisture content on the flow behavior is examined. The results show that when the moisture content increases, the mean particle velocity decreases while the bed mean solid "holdup" and the mean residence time (MRT) of particles grow. It is also found that the local solid holdup is relatively higher in the near-wall region and decreases towards the near-fluid region. Two regression models are introduced accordingly for the mean particle velocity and the bed mean solid holdup by means of the RSM-BBD (Response surface methodology-Box-Behnken design) method to obtain the optimal combination of parameters for flooding prevention. Finally, the optimal results are compared with numerical observations. As the relative error is less than 10%, this demonstrates that the proposed methodology can accurately describe the particle flow dynamics in the drying unit.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Wet Particles Motion in a Vertical Powder Dryer

Yu,

Pang,

She

et al. 2024

FDMP

View full text Add to dashboard Cite

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Investigation on the influence of particle size and porosity on solid phase fluidization and heat transfer in carbon fibre porous media

Wang,

Zhang,

Yang

2024

Can J Chem Eng

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In this paper, the 3D pore structure was reconstructed and solid phase fluidization in porous media was investigated. Based on the two fluid model, a computational fluid dynamics (CFD) model of gas–solid fluidization was established and the influence of particle size and porosity were investigated. When porosity was constant, during the fluidization process, the particle velocity and solid concentration standard deviation gradually decreased, and the bed height increased. At the same time, the smaller the particle size was, the smaller the solid concentration standard deviation was, the faster the bed height increased, and the more the particle temperature decreased. Based on the fixed value of particle size, when studying the effect of porosity on fluidization, it was found that with the enhancement of solid‐phase fluidization, particle velocity, solid concentration standard deviation, and particle temperature decreased, and bed height increased. Moreover, when porosity was large, particle velocity decreased rapidly, and solid concentration standard deviation reached a smaller minimum value, which took a longer time. Within the same time, the particle temperature also decreased less.

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