Onset of slugging fluidization in supercritical water fluidized bed--颗粒学报PARTICUOLOGY

Wang, H., Huang, J., & Lu, Y. (2020). Onset of slugging fluidization in supercritical water fluidized bed. Particuology, 52, 47-56. https://doi.org/10.1016/j.partic.2019.11.005

Onset of slugging fluidization in supercritical water fluidized bed

Hao Wang ^a, Jikai Huang ^b, Youjun Lu ^a *

a State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
b Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, Shandong, China

10.1016/j.partic.2019.11.005

Volume 52, October 2020, Pages 47-56

Received 3 July 2019, Revised 14 October 2019, Accepted 6 November 2019, Available online 11 January 2020, Version of Record 24 June 2020.

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

Highlights

• A correlation to identify onset of slugging fluidization in SCWFB is proposed.

• The effect of operation conditions on U_ms is discussed.

• The effect of U_f on slug hydrodynamics is discussed.

Abstract

The supercritical-water fluidized bed (SCWFB) is a reactor for coal and biomass gasification without pollutant emission. We carried out a series of experiments in a SCWFB, and a dual-capacitance probe measurement system was applied to measure the hydrodynamics of slugs, such as the slug frequency, chord length, and rising velocity. Four groups of Geldart-B particles with different mean diameters were fluidized by supercritical water with a system pressure of 20–27 MPa and at 410–570 °C. The minimum slugging Reynolds number increases logarithmically with Archimedes number and a predicting correlation of the minimum slugging fluidization velocity in the SCWFB is presented: Re_ms = 32908.84ln(Ar^0.55 + 260376.65) – 410361.90 . The relative error of the above correlation was within ±15% and the averaged relative error was 7.5%. The effect of operating conditions on the minimum slugging fluidization velocity is discussed. This research provides useful guidance for scaling-up design and for determining the optimum range of operating conditions in the SCWFB.

Graphical abstract

Keywords

Supercritical water fluidized bed; Slugging fluidization; Dual-capacitance probe method

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