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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

EFFECTS OF RADIATIVE HEATING RATE AND PARTICLE SIZE ON THERMAL TRANSPORT IN A POROUS CO2 SORBENT PARTICLE

DOI: 10.1615/TFESC1.prm.012969
pages 2233-2235

Lindsey D. Yue
Research School of Engineering, The Australian National University, Canberra, ACT, 2601, Australia

Wojciech Lipinski
Research School of Engineering, The Australian National University, Canberra, ACT 2601, Australia


KEY WORDS: CO2 capture, thermal transport, porous media, numerical modeling

Abstract

A transient heat and mass transfer model including reversible chemical kinetics is applied to a sorbent particle employed for solar-driven thermochemical CO2 capture. CO2 is captured via the two-step calcination− carbonation cycle where concentrated solar irradiation provides the process heat for regenerating the active sorbent in the calcination step. The governing mass and energy conservation equations of the model are developed for both the reacting solid and the in the pore space. The model is solved numerically and used to investigate the effects of radiative heat transfer relative to other heat transfer modes and particle size on intra-particle thermal transport phenomena during thermochemical cycling. These effects are investigated by varying the magnitude of incident solar irradiation, the temperature and velocity of the ambient , and the particle size. A numerical solution to the governing equations is found by employing the finite volume method for spacial discretization and the explicit Euler time-integration scheme. Time-periodic boundary conditions for incident irradiation and ambient composition representative of an idealized reactor-like environment are applied to achieve chemical cycling. The model predicts the unsteady composition of the solid and gas phases, local temperature distributions, and the amount of CO2 captured per cycle. Sorbent utilization and energetic efficiency are compared for the parameters considered.

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