Onset of slugging fluidization in supercritical water fluidized bed

Wang, Hao; Huang, Jinliang; Lu, Youjun

doi:10.1016/j.partic.2019.11.005

Cited by 8 publications

(8 citation statements)

References 52 publications

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“…The temperature, pressure, and flow rate are obtained by the measuring system, which is shown in Figure b,c. More information about devices and equipment can be found in our previous work. ,,, In this work, capacitance probes were applied for measuring voidage distribution and bubble hydrodynamics (e.g., velocities and sizes), which will be used to validate the MSD-EMMS model.…”

Section: Methodsmentioning

confidence: 99%

“…The MSD EMMS drag model proposed in this paper is developed for SCW fluidized beds so that experimental results are vital for this study. The experimental setup and measuring method are also introduced, which can be found in our previous publications. ,,− …”

Section: Experimental Workmentioning

confidence: 99%

“…17 The onset of slugging fluidization in the SCW fluidized bed was studied and the effect of operating conditions on minimum slugging fluidization velocity was also investigated. 21 Correlations of the drag coefficient and volume fraction of bubbles in the SCW fluidized bed were also proposed. 22 The effect of operation conditions on voidage distribution of the emulsion phase was investigated and a predicting correlation between voidage and superficial velocity in the emulsion phase was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of operating parameters on bubble hydrodynamics (e.g., bubble size, frequency, and rising velocity) was discussed and a correlation between bubble velocity and size was also proposed . The onset of slugging fluidization in the SCW fluidized bed was studied and the effect of operating conditions on minimum slugging fluidization velocity was also investigated . Correlations of the drag coefficient and volume fraction of bubbles in the SCW fluidized bed were also proposed .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mesoscale-Structure-Dependent EMMS Drag Model for an SCW Fluidized Bed: Formulation of Conservation Equations Based on Structures in Subphases

Wang

2021

Ind. Eng. Chem. Res.

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Supercritical water (SCW) fluidized bed reactors release no pollutants in the gasification process of converting biomass into fuel. In this work, a mesoscale-structure-dependent (MSD) energy minimization multiscale system (EMMS) drag model for SCW fluidized beds is proposed. Experimental results and empirical correlations are applied to validate the voidage distribution and bubble hydrodynamics calculated by the MSD-EMMS model. Besides, this study presents a comparison of the properties of computed bubbles between the Gidaspow model, EMMS/bubbling model, and MSD-EMMS model. Bubble properties predicted by the MSD-EMMS model agree better with experimental results and empirical correlations than other drag models. The research work can serve as guidance for the optimization of SCW gasification technology.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mesoscale-Structure-Dependent EMMS Drag Model for an SCW Fluidized Bed: Formulation of Conservation Equations Based on Structures in Subphases

Wang

2021

Ind. Eng. Chem. Res.

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“…Wang et al proposed the correlation between superficial velocity and voidage of the emulsion phase . Through coupling dual-capacitance probes and the cross-correlation algorithm, the bubble dynamic characteristics and U mb of SCWFB were investigated by Huang et al , The drag coefficient of bubbles and the onset of slugging fluidization were investigated by Wang et al , …”

Section: Introductionmentioning

confidence: 99%

3D Simulations of Voidage Distribution in SCW Fluidized Beds Using the EMMS Model

Wang

2022

Ind. Eng. Chem. Res.

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Supercritical water fluidized beds (SCWFBs) are advanced reactors for biomass gasification. In this work, three-dimensional (3D) simulations are carried out using the energy minimization multiscale (EMMS) model developed for SCWFBs. The voidage distribution obtained by the EMMS model is validated by time-averaged experimental results. The effects of superficial inlet velocity (U f), temperature (T), pressure (P), and particle size (d p) on the radial and axial voidage, probability density of voidage, and bed expansion are studied. The voidage distribution curves at different radial positions are parabolic due to “core-annular flow” structures. The probability density decreases with increasing voidage of SCWFBs. Bed expansion height is affected by the excess fluid caused by the change in physical properties. The simulation results can provide theoretical guidance for the scaled-up design of SCWFBs.

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Drag coefficient and volume fraction of bubbles in a supercritical water fluidized bed

Wang

2021

Particuology

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Onset of slugging fluidization in supercritical water fluidized bed

Cited by 8 publications

References 52 publications

Mesoscale-Structure-Dependent EMMS Drag Model for an SCW Fluidized Bed: Formulation of Conservation Equations Based on Structures in Subphases

Mesoscale-Structure-Dependent EMMS Drag Model for an SCW Fluidized Bed: Formulation of Conservation Equations Based on Structures in Subphases

3D Simulations of Voidage Distribution in SCW Fluidized Beds Using the EMMS Model

Drag coefficient and volume fraction of bubbles in a supercritical water fluidized bed

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