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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 July 29, 2008
Accepted February 6, 2009

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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CO2 capture from flue gases using a fluidized bed reactor with limestone

Fan Fang Zhen-shan Li Ning-sheng Cai^†

Key Lab for Thermal Science and Power Engineering of the Ministry of Education (MOE),Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

cains@tsinghua.edu.cn

Korean Journal of Chemical Engineering, September 2009, 26(5), 1414-1421(8), 10.1007/s11814-009-0198-3

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Abstract

The CO2 capture from flue gases by a small fluidized bed reactor was experimentally investigated with limestone. The results showed that CO2 in flue gases could be captured by limestone with high efficiency, but the CO2 capture capacity of limestone decayed with the increasing of carbonation/calcination cycles. From a practical point of view, coal may be required to provide the heat for CaCO3 calcination, resulting in some potential effect on the sorbent capacity of CO2 capture. Experiment results indicated that the variation in the capacity of CO2 capture by using a limestone/coal ash mixture with a cyclic number was qualitatively similar to the variation of the capacity of CO2 capture using limestone only. Cyclic stability of limestone only undergoing the kinetically controlled stage in the carbonation process had negligible difference with that of the limestone undergoing both the kinetically controlled stage and the product layer diffusion controlled stage. Based on the experimental data, a model for the high-velocity fluidized bed carbonator that consists of a dense bed zone and a riser zone was developed. The model predicted that high CO2 capture efficiencies (>80%) were achievable for a range of reasonable operating conditions by the high-velocity fluidized bed carbonator in a continuous carbonation and calcination system.

Keywords

CO2 Capture Carbonation/Calcination Reactions Fluidized Bed Reactor Modeling Sorbent

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