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Research Papers: Energy Systems Analysis

Hydrodynamic Flow Characteristics in an Internally Circulating Fluidized Bed Gasifier

[+] Author and Article Information
J. P. Simanjuntak

Mechanical Engineering Department,
State University of Medan,
Medan 20221, North Sumatera, Indonesia
e-mail: janterps@gmail.com

K. A. Al-attab

School of Mechanical Engineering,
Universiti Sains Malaysia,
Engineering Campus,
Nibong Tebal 14300, Penang, Malaysia
e-mail: khaledalattab@yahoo.com

Z. A. Zainal

School of Mechanical Engineering,
Universiti Sains Malaysia,
Engineering Campus,
Nibong Tebal 14300, Penang, Malaysia
e-mail: mezainal@usm.my

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 24, 2018; final manuscript received July 22, 2018; published online September 14, 2018. Assoc. Editor: Reza Sheikhi.

J. Energy Resour. Technol 141(3), 032001 (Sep 14, 2018) (8 pages) Paper No: JERT-18-1066; doi: 10.1115/1.4041092 History: Received January 24, 2018; Revised July 22, 2018

In this paper, the hydrodynamic flow inside an internally circulating fluidized bed (ICFBG) was characterized using experimental and three-dimensional computational fluid dynamics (CFD) models. Eulerian-Eulerian model (EEM) incorporating the kinetic theory of granular flow was implemented in order to simulate the gas–solid flow. A full-scale plexiglass cold flow experimental model was built to verify simulation results prior to the fabrication of the gasifier. Six parameters were manipulated to achieve the optimum design geometry: fluidization flow rate of the draft tube (Qdt), aeration flow rate of the annulus (Qan), initial bed static height (Hbs), draft tube height (Hdt), draft tube diameter (Ddt), and orifice diameter (Dor). The investigated parameters showed strong effect on the particle flow characteristics in terms of the pressure difference (ΔP) and solid circulation rate (Gs). The predicted results by simulation for the optimum case were in close agreement with experimental measurements with about 5% deviation. The results show that the ICFBG operated stably with the maximum Gs value of 86.6 kg/h at Qdt of 350 LPM, Qan of 150 LPM, Hbs of 280 mm, Hdt of 320 mm, Ddt of 100 mm, and Dor of 20 mm.

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Figures

Grahic Jump Location
Fig. 1

(a) Configuration of the reactor geometry of the model and experimental setup and (b) annulus and draft tube air distributers

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Fig. 2

Bed pressure for simulation group 1 at Qdt: 350 LPM Along: (a) radial axis (X–Z axis) through the orifice center, (b) draft tube height (Y-axis), and (c) orifice center (X–Z axis)

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Fig. 3

Solid volume fraction contours at Qdt: 300-450 LPM (simulation group 1)

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Fig. 4

Effect of (a) Qdt on bed pressure and pressure difference (simulation group 1) and (b) Qan and Qdt on Gs (simulation groups 1 and 2)

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Fig. 5

(a) Contour of solid fraction initial condition on X–Y planes and (b) effect of Hbs on Gs (simulation group 3)

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Fig. 6

Effect of (a) Dor on Gs (simulation group 5) and (b) Ddt on Gs (simulation group 4)

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Fig. 7

(a) Bed pressure profile at Hdt of 370 mm and (b) effect of Hdt on Gs (simulation group 6)

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Fig. 8

(a) Effect of Qdt and Qan on Gs in the experimental model and (b) a comparison between the CFD simulation and experimental model (simulation group 1)

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