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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received June 21, 2013
Accepted October 14, 2013

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Simulation of a bubbling fluidized bed process for capturing CO2 from flue gas

Jeong-Hoo Choi^† Chang-Keun Yi¹ Sung-Ho Jo¹ Ho-Jung Ryu¹ Young-Cheol Park¹

Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Korea ¹Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon 305-343, Korea

choijhoo@konkuk.ac.kr

Korean Journal of Chemical Engineering, February 2014, 31(2), 194-200(7), 10.1007/s11814-013-0212-7

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Abstract

We simulated a bubbling bed process capturing CO2 from flue gas. It applied for a laboratory scale process to investigate effects of operating parameters on capture efficiency. The adsorber temperature had a stronger effect than the regenerator temperature. The effect of regenerator temperature was minor for high adsorber temperature. The effect of regenerator temperature decreased to level off for the temperature >250 ℃. The capture efficiency was rather dominated by the adsorption reaction than the regeneration reaction. The effect of gas velocity was as appreciable as that of adsorber temperature. The capture efficiency increased with the solids circulation rate since it was ruled by the molar ratio of K to CO2 for solids circulation smaller than the minimum required one (Gs, min). However, it leveled off for solids circulation rate >Gs, min. As the ratio of adsorber solids inventory to the total solids inventory (xw1) increased, the capture efficiency increased until xw1=0.705, but decreased for xw1>0.705 because the regeneration time decreased too small. It revealed that the regeneration reaction was faster than the adsorption reaction. Increase of total solids inventory is a good way to get further increase in capture efficiency.

Keywords

CO2 Capture Flue Gas Simulation Fluidized Bed Dual Bed

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