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Research Papers: Fuel Combustion

Experimental Study of Transient Hydrodynamics in a Spouted Bed of Polydisperse Particles

[+] Author and Article Information
Ling Bai

Research Center of Fluid
Machinery Engineering and Technology,
Jiangsu University,
Zhenjiang 212013, Jiangsu, China
e-mail: lingbai@ujs.edu.cn

Weidong Shi

School of Mechanical Engineering,
Nantong University,
Nantong 226019, Jiangsu, China
e-mail: wdshi@ujs.edu.cn

Ling Zhou

Mem. ASME
Research Center of Fluid
Machinery Engineering and Technology,
Jiangsu University,
Zhenjiang 212013, Jiangsu, China
e-mail: lingzhoo@hotmail.com

Lingjie Zhang

Research Center of Fluid
Machinery Engineering and Technology,
Jiangsu University,
Zhenjiang 212013, Jiangsu, China
e-mail: 1435131476@qq.com

Wei Li

Research Center of Fluid
Machinery Engineering and Technology,
Jiangsu University,
Zhenjiang 212013, Jiangsu, China
e-mail: lwjiangda@ujs.edu.cn

Ramesh K. Agarwal

Fellow ASME
Department of Mechanical Engineering and
Materials Science,
Washington University in St. Louis,
St. Louis, MO 63130
e-mail: rka@wustl.edu

1Corresponding authors.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received September 19, 2017; final manuscript received February 17, 2018; published online April 13, 2018. Assoc. Editor: Ronald Breault.

J. Energy Resour. Technol 140(8), 082206 (Apr 13, 2018) (8 pages) Paper No: JERT-17-1499; doi: 10.1115/1.4039614 History: Received September 19, 2017; Revised February 17, 2018

In industrial processes such as chemical looping combustion, single-component spouted beds of monodisperse particles are very rarely used but the spouted beds of polydisperse particles have been widely used. The flow characteristics of polydisperse particles are much more complex than the single particle fraction in a fluidized bed. To investigate the gas–solid two-phase flow characteristics of the particles with different diameters in a spouted bed, the segregation and mixing characteristics, bubble morphology, minimum spouting velocity, and pressure fluctuations of the particles with different sizes under different superficial gas velocities are studied experimentally. The results show that higher the initial bed height and larger the volume fraction of the bigger particles, higher is the minimum spouting velocity. Moreover, the magnitude of the minimum spouting velocity increases exponentially with increase in the volume fraction of the bigger particles. At low superficial gas velocity, there is a clear trend of segregation between the particles of different diameters. At moderate superficial gas velocity, the mixing trend among particles of different diameters is enhanced, and the pressure fluctuations in the bed present some degree of regularity. At high superficial gas velocity, the particles of different diameters tend to separate again, the pressure fluctuations become intense, and the particle flow turns into a turbulent state. Furthermore, when the bed becomes stable, the particles of different diameters distribute within the bed with regular stratification.

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Figures

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Fig. 5

Minimum spouting velocity versus the proportion of the particles with large diameter

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Fig. 4

Changes in bubble morphology at different velocities from t = 400 ms to 750 ms (top: v = 0.007 kg/s, middle: v = 0.00 8 kg/s, bottom: v = 0.009 kg/s)

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Fig. 3

Changes in bubble morphology at different velocities from t = 0 ms to 350 ms (top: v = 0.007 kg/s, middle: v = 0.008 kg/s, bottom: v = 0.009 kg/s)

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Fig. 6

Density of the top layer of the bed along the radial direction

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Fig. 7

Volume fraction of the large particles in the top layer of the bed along the radial direction

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Fig. 8

Pressure fluctuations at z = 2 cm

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Fig. 9

Pressure fluctuations at z = 22 cm

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Fig. 10

Pressure fluctuations at z = 40 cm

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Fig. 2

The test-spouted bed

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Fig. 1

Experimental apparatus: (a) actual experimental apparatus and (b) schematic diagram of the experimental apparatus

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