Comparison of numerical simulations and experiments in conical gas–solid spouted bed

Wang, Shuyan; Shao, Baoli; Liu, Rui; Zhao, Jian; Liu, Yang; Liu, Yikun; Yang, Shuren

doi:10.1016/j.cjche.2015.07.006

Cited by 12 publications

(9 citation statements)

References 27 publications

(16 reference statements)

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“…For a spouted bed, Wang et al [210] noted that the Huilin-Gidaspow drag coefficient under-predicted the bed pressure drop and fountain height, suggesting the implementation of a modified drag model to take into account more appropriately the effect of the wall on the flow.…”

Section: Optimisation Of Drag Laws and Coefficientsmentioning

confidence: 99%

“…Number of Occurrences References k-ε 18 [90,92,203,204,206,209,211,212,[215][216][217][218][223][224][225][226][227][230][231][232],236] None or not specified 16 [25,89,91,202,203,205,207,208,210,213,214,[220][221][222]228,229] Riera and co-workers [217] simulated a multi-phase spouted column to test the validity of three turbulence models: the k-ε model, the k-ω model [240] and the SST model [241]. They observed that the k-ε and k-ω models yielded similar results for an air-water mixture, while the SST model was the most adequate for the air-water-sand mixture.…”

Section: Modelmentioning

confidence: 99%

“…Gidaspow [154] 17 [25,91,[204][205][206][208][209][210]213,218,220,222,226,228,229,234,235] Syamlal-O'Brien [158] 14 [89,90,92,114,203,207,214,215,224,225,[230][231][232]236 Turbulence was not extensively discussed in most works and when considered, the k-ε turbulence model [239] was mostly employed. As it can be seen in Table 9, almost half of the works did not include a turbulence model.…”

Section: Drag Law Number Of Occurrences Referencesmentioning

confidence: 99%

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Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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The development of robust mathematical models could provide the necessary tools for a more rapid, efficient, and reliable spouted bed technology development. Computer simulations can be very useful to aid this design and scale-up process: firstly, they can contribute to obtain a fundamental insight into their complex dynamic behavior by understanding the elementary physical principles such as drag, friction, dissipation etc.; secondly, the simulations can be used as a design tool where the ultimate goal is to have a numerical model with predictive capabilities for gas-particle flows at engineering scale. Clearly, one single simulation method will not be able to achieve this goal, but a hierarchy of methods modelling phenomena on different length and time scales can achieve this. The most fruitful approach will be when they are simultaneously followed, so that they can mutually benefit from each other. In this sense, this paper presents a review of the current state of the art of modelling on spouted and spout-fluid beds through an analysis of recent literature following a multiscale approach (molecular and particle, lab, plant and industrial scale). The main features of the different scales together with their current limits are discussed and specific topics are highlighted as paths that still need to be explored. In summary, the paper aims to define the theoretical setline and the basis of improvement that would lead to a robust multiscale model with solid links between micro and macroscopic phenomena. If done with the correct balance between accuracy and computational costs it will gear SB towards their reliable and successful implementation.

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Section: Optimisation Of Drag Laws and Coefficientsmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%

Section: Drag Law Number Of Occurrences Referencesmentioning

confidence: 99%

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Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

et al. 2017

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“…Hence, numerical simulation is very useful for elaborating the multiphase gas−solid flow to improve the design and operation of the reactor. 22−26 Wang et al 27 the solid phase in the fluid on the flow characteristics of the spouted bed by Lan et al 28 Using the method of comparing numerical prediction with experimental results, the simulation shows that the wall boundary conditions of the solid phase in the fluid play an essential role in the numerical modeling. Wu et al 29,30 used the CFD method to simulate the semi-dry FGD process in the two-dimensional spouted bed and analyzed the influence of different operating parameters on the desulfurization efficiency (such as temperature and superficial gas velocity).…”

Section: Introductionmentioning

confidence: 99%

“…In order to overcome these difficulties, the simulation method can quickly be used to obtain the physical parameters and the details of spouting in the bed. Hence, numerical simulation is very useful for elaborating the multiphase gas–solid flow to improve the design and operation of the reactor. − Wang et al used the multi-fluid model and the kinetic theory of granular flows (KTGF) to experimentally study and simulate the gas–solid two-phase flow in the bed. Comparing the experiment with the simulation, it shows that the results of the drag coefficient model used in the simulation are consistent with the experiment.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of a Water Vaporization Process in a Three-Dimensional Spouted Bed for Flue Gas Desulfurization

Hui

et al. 2021

ACS Omega

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In this work, the gas−solid flow and water vaporization process are simulated by the method of Euler−Eulerian two-fluid model in a three-dimensional spouted bed, which have a significant influence on the desulfurization efficiency. The results of simulation indicate that the change trends of the particle volume fraction are similar under superficial gas velocities of 0.7 and 0.8 m/s. The degree of particle pulsation is the highest at the bottom of the spout area, and the degree of gas pulsation is the highest at the junction of the annulus area and spout area. The temperatures of gas, liquid, and particles are also analyzed. The results demonstrate that in the spout area, the gas temperature is much higher than that of the liquid and particles, but the three phases are uniformly mixed and have similar temperatures in other areas. Moreover, water vaporization mainly occurs at the junction of the annulus area and the spout area, a small amount of liquid is vaporized at the center of the spout area, and basically no vaporization reaction occurs in the outer radius of the annulus area. With the increase in gas velocity, gas temperature, and liquid temperature and the decrease in gas humidity, water vaporization reaction is promoted.

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Influence of Longitudinal Vortex Generator Configuration on the Hydrodynamics in a Novel Spouted Bed

Huang

Zhang

et al. 2018

Chem Eng & Technol

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The gas-solid flow in a cylindrical spouted bed with a pair of spherical longitudinal vortex generators (LVGs) was numerically investigated by a two-fluid model with kinetic theory for granular flow. Simulations and analyses were conducted on five types of spouted beds: a conventional spouted bed without disturbance units as well as spouted beds with a pair of LVGs in which the radius of spheres installed on the LVGs had four different dimensions. Results of the computational fluid dynamics demonstrate that the fountain height decreases with larger radius, and the influence range of the longitudinal vortex increases with the greater radius, both for the gas phase and particle phase. The turbulent kinetic energy of the gas phase along the radial and axial directions in the spouted bed was also promoted significantly by the longitudinal vortex and increased with larger radius, which is due to the higher LVG volume.

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Comparison of numerical simulations and experiments in conical gas–solid spouted bed

Cited by 12 publications

References 27 publications

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

Modelling of Spouted and Spout-Fluid Beds: Key for Their Successful Scale Up

CFD Analysis of a Water Vaporization Process in a Three-Dimensional Spouted Bed for Flue Gas Desulfurization

Influence of Longitudinal Vortex Generator Configuration on the Hydrodynamics in a Novel Spouted Bed

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