Research Papers

Effect of Fuel and Oxygen Carriers on the Hydrodynamics of Fuel Reactor in a Chemical Looping Combustion System

[+] Author and Article Information
Atal Bihari Harichandan

Institute Center for Energy (iEnergy),
Department of Mechanical
and Materials Engineering,
Masdar Institute of Science and Technology,
Masdar City, Abu Dhabi 54224, UAE

Tariq Shamim

Professor of Mechanical Engineering
Institute Center for Energy (iEnergy),
Department of Mechanical
and Materials Engineering,
Masdar Institute of Science and Technology,
Masdar City, Abu Dhabi 54224, UAE
e-mail: tshamim@masdar.ac.ae

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 1, 2013; final manuscript received July 11, 2014; published online August 18, 2014. Assoc. Editor: Alexander L. Brown.

J. Thermal Sci. Eng. Appl 6(4), 041013 (Aug 18, 2014) (8 pages) Paper No: TSEA-13-1077; doi: 10.1115/1.4028047 History: Received May 01, 2013; Revised July 11, 2014

The hydrodynamics of a fuel reactor in a chemical looping combustion (CLC) system is analyzed by using a multiphase two-dimensional computational fluid dynamics (CFD) model that involves solid–gas interactions and chemical reactions. The study compares the fuel reactors of two CLC systems numerically by using hydrogen with calcium sulfide as an oxygen carrier, and methane with nickel as an oxygen carrier in similar conditions. Kinetic theory of granular flow has been adopted. The model considers the conservation equations of mass, momentum and species, and reaction kinetics of oxygen carriers. The results obtained are in good agreement with the experimental and numerical results available in open literature. The bubble hydrodynamics in both the fuel reactors are analyzed. The salient features of the bubble formation, rise, and burst are more prominent in the hydrogen-fueled reactor as compared to the methane-fueled reactor. The fuel conversion rate is found to be larger for the hydrogen-fueled reactor.

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Fig. 1

Schematic view of CLC process

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Fig. 2

CLC system with two interconnected fluidized bed reactors

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Fig. 3

Schematic and grid of the fuel reactor

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Fig. 4

Solid volume fraction contour in fuel reactor with H2 as fuel gas at different temperatures (a) 850 K, (b) 950 K, (c) 1050 K, and (d) 1150 K

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Fig. 5

Solid volume fraction contour in fuel reactor with CH4 as fuel gas at different temperatures (a) 850 K, (b) 950 K, (c) 1050 K, and (d) 1150 K

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Fig. 6

Temporal variation of mass fraction of fuel gas: (a) H2 and (b) CH4

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Fig. 7

Conversion rate of fuel gas at different temperatures




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