TY  - JOUR
A1  - Lei, Timan
A1  - Luo, Kai H
A1  - Perez, Francisco E Hernandez
A1  - Wang, Geng
A1  - Yang, Junyu
A1  - Cano, Juan Restrepo
A1  - Im, Hong G
SN  - 0022-1120
EP  - 42
KW  - Convection in porous media
KW  -  solidification/melting
KW  -  coupled diffusion and flow
Y1  - 2024/07/10/
UR  - https://doi.org/10.1017/jfm.2024.351
PB  - CAMBRIDGE UNIV PRESS
N2  - Cryogenic carbon capture (CCC) is an innovative technology to desublimate CO2 out of industrial flue gases. A comprehensive understanding of CO2 desublimation and sublimation is essential for widespread application of CCC, which is highly challenging due to the complex physics behind. In this work, a lattice Boltzmann (LB) model is proposed to study CO2 desublimation and sublimation for different operating conditions, including the bed temperature (subcooling degree ?Ts), gas feed rate (Péclet number Pe) and bed porosity (?). The CO2 desublimation and sublimation properties are reproduced. Interactions between convective CO2 supply and desublimation/sublimation intensity are analysed. In the single-grain case, Pe is suggested to exceed a critical value Pec at each ?Ts to avoid the convection-limited regime. Beyond Pec, the CO2 capture rate (vc) grows monotonically with ?Ts, indicating a desublimation-limited regime. In the packed bed case, multiple grains render the convective CO2 supply insufficient and make CCC operate under the convection-limited mechanism. Besides, in small-?Ts and high-Pe tests, CO2 desublimation becomes insufficient compared with convective CO2 supply, thus introducing the desublimation-limited regime with severe CO2 capture capacity loss (?d). Moreover, large ? enhances gas mobility while decreasing cold grain volume. A moderate porosity ?c is recommended for improving the CO2 capture performance. By analysing vc and ?d, regime diagrams are proposed in ?Ts?Pe space to show distributions of convection-limited and desublimation-limited regimes, thus suggesting optimal conditions for efficient CO2 capture. This work develops a viable LB model to examine CCC under extensive operating conditions, contributing to facilitating its application.
JF  - Journal of Fluid Mechanics
AV  - public
N1  - This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
ID  - discovery10199840
TI  - Pore-scale study of CO2 desublimation and sublimation in a packed bed during cryogenic carbon capture
VL  - 990
ER  -