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Special Topics & Reviews in Porous Media: An International Journal
ESCI SJR: 0.277 SNIP: 0.52 CiteScore™: 1.3

ISSN Druckformat: 2151-4798
ISSN Online: 2151-562X

Special Topics & Reviews in Porous Media: An International Journal

DOI: 10.1615/.2015012344
pages 197-209

THERMAL TRANSPORT MODEL OF A PACKED-BED REACTOR FOR SOLAR THERMOCHEMICAL CO2 CAPTURE

Leanne Reich
University of Minnesota, Minneapolis, Minnesota 55455, USA
Roman Bader
The Australian National University, Canberra, ACT 2601, Australia
Terrence W. Simon
Department of Mechanical Engineering, University of Minnesota, 111 Church St. S.E., Minneapolis, Minnesota 55455, USA
Wojciech Lipinski
Research School of Engineering, The Australian National University, Canberra ACT 2601, Australia

ABSTRAKT

A 1 kWth dual-cavity solar thermochemical reactor concept is proposed to capture carbon dioxide via the calcium oxide based calcination-carbonation cycle. The reactor design is refined using a numerical heat and fluid flow model for the calcination step. The Monte Carlo ray-tracing and net radiation methods are employed to solve for radiative exchange in the inner cavity, coupled with a computational fluid dynamics analysis to solve the mass, momentum, and energy equations in the concentric reaction zone modeled as a gas-saturated porous medium consisting of optically large particles. The cavity diameter and length-to-diameter ratio are varied to study their effects on pressure drop, temperature distribution, and heat transfer in the reactor. The Monte Carlo ray-tracing and net radiation methods are compared for accuracy and computation time. The net radiation method reaches convergence 1.5 times faster than the Monte Carlo ray-tracing method and provides a smoother radiative flux distribution. Increasing the cavity diameter and length-todiameter ratio at a fixed volume of the reaction zone decreases the radial temperature gradients across the cavity wall and within the reaction zone. However, it also results in increased pressure drop and reduced heat transfer to the reaction zone.


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