Drag coefficient and volume fraction of bubbles in a supercritical water fluidized bed--颗粒学报PARTICUOLOGY

Wang, H., & Lu, Y. (2021). Drag coefficient and volume fraction of bubbles in a supercritical water fluidized bed. Particuology, 57, 127-138. https://doi.org/10.1016/j.partic.2020.11.005

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

Hao Wang, Youjun Lu ^*

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

10.1016/j.partic.2020.11.005

Volume 57, August 2021, Pages 127-138

Received 15 August 2020, Revised 19 October 2020, Accepted 12 November 2020, Available online 8 January 2021, Version of Record 26 February 2021.

E-mail: yjlu@mail.xjtu.edu.cn

Highlights

• Correlations of drag coefficient and volume fraction of bubbles in SCWFBs are demonstrated.

• The effect of the operating conditions on drag coefficient and volume fraction is discussed.

• Dual-capacitance probe system is applied for measuring bubble hydrodynamics.

Abstract

The supercritical water fluidized bed (SCWFB) is a recently introduced reactor for biomass gasification that does not release pollutants. Four groups of Geldart B-type quartz sands with different particle sizes were fluidized at a system pressure of 20–27 MPa and system temperature of 410–570 °C. A series of experiments were performed for determining the drag coefficient and volume fraction of bubbles. The effects of the particles’ size, superficial velocity, system pressure, and temperature on the drag coefficient and volume fraction are discussed. In addition, a correlation between experimental and computed values is demonstrated for both the drag coefficient and volume fraction in SCWFBs. The relative error of the correlation is within ±30%. The results of this study provide significant guidance for the scaling-up design of SCWFBs and for the development of supercritical water gasification technology.

Graphical abstract

Keywords

Supercritical water fluidized bed; Bubbles; Drag coefficient; Volume fraction

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