Research Papers

Transient Reacting Flow Simulation of Spouted Fluidized Bed for Coal-Direct Chemical Looping Combustion

[+] Author and Article Information
Subhodeep Banerjee

Department of Mechanical Engineering &
Materials Science,
Washington University in St. Louis,
1 Brookings Drive,
St. Louis, MO 63128
e-mail: sb13@wustl.edu

Ramesh K. Agarwal

Fellow ASME
Department of Mechanical Engineering &
Materials Science,
Washington University in St. Louis,
1 Brookings Drive,
St. Louis, MO 63128
e-mail: rka@wustl.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received July 20, 2014; final manuscript received February 12, 2015; published online March 24, 2015. Assoc. Editor: Ziad Saghir.

J. Thermal Sci. Eng. Appl 7(2), 021016 (Jun 01, 2015) (9 pages) Paper No: TSEA-14-1167; doi: 10.1115/1.4029951 History: Received July 20, 2014; Revised February 12, 2015; Online March 24, 2015

Coal-direct chemical-looping combustion (CD-CLC) is a next generation combustion technology that shows great promise as a solution for the need of high-efficiency low-cost carbon capture from fossil fueled power plants. To realize this technology on an industrial scale, the development of high-fidelity simulations is a necessary step to develop a thorough understanding of the CLC process. In this paper, simulations for multiphase flow of the CD-CLC process with chemical reactions are performed using ANSYS Fluent computational fluid dynamics (CFD) software. The details of the solid–gas two-phase hydrodynamics in the CLC process are investigated using the Lagrangian particle-tracking approach called the discrete element method (DEM) for the movement and interaction of the solid oxygen carrier particles with the gaseous fuel. The initial CFD/DEM simulation shows excellent agreement with the experimental results obtained in a laboratory scale fuel reactor in cold-flow conditions at Darmstadt University of Technology. Subsequent simulations using 60% Fe2O3 supported on MgAl2O4 reacting with gaseous CH4 demonstrate successful integration of chemical reactions into the CFCD/DEM approach. This work provides a strong foundation for future simulations of CD-CLC systems using solid coal as fuel, which will be crucial for successful deployment of CD-CLC technology from the laboratory scale to pilot and industrial scale projects.

Copyright © 2015 by ASME
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Fig. 1

Reacting particle in the multiple surface reactions model

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Fig. 2

Spouted fluidized bed apparatus at Darmstadt University of Technology (left) and CFD model (right)

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Fig. 3

Comparison of particle distribution in the reactor for the first 300 ms of jet injection between Fluent CFD/DEM simulation (top) and TU-Darmstadt experiment (bottom)

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Fig. 4

Time variation of bed height and pressure at various heights for cold-flow simulation

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Fig. 5

Geometry outline with pressure taps, mesh, and wireframe of the complete CD-CLC configuration

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Fig. 6

Particle tracks colored by velocity magnitude in reacting flow with F60AL1100 particles

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Fig. 7

Static pressure at pressure taps P1–P5 in the CD-CLC system of Fig. 5 at t = 400 ms (upper left), 800 ms (upper right), 1200 ms (lower left), and 1600 ms (lower right) in reacting flow

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Fig. 8

Particle tracks colored by mass fraction of Fe3O4 relative to original mass of Fe2O3

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Fig. 9

Contours of CO2 mass fraction produced by reaction of Fe2O3 with CH4




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