Performance of a Bench-Scale Fast Fluidized Bed Carbonator

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• 作者：Sharat K. Pathi ; Weigang Lin ; Jytte B. Illerup ; Kim Dam-Johansen ; Klaus Hjuler
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：August 21, 2014
• 年：2014
• 卷：28
• 期：8
• 页码：5259-5269
• 全文大小：511K
• ISSN：1520-5029

文摘

The carbonate looping process is a promising technology for CO₂ capture from flue gas. In this process, the CO₂ capture efficiency depends on the performance of a carbonator that may be operated as a circulating fluidized bed (CFB). In this paper, the carbonator performance is investigated by applying a new experimental method with accurate control of the particle recirculation rate. The experimental results show that the inlet calcium to carbon molar ratio is the main factor on the CO₂ capture efficiency in the carbonator, that is, increasing the inlet Ca/C from 4 to 13 results in increasing the CO₂ capture efficiency from 40 to 85% with limestone having a maximum CO₂ capture capacity of only 11.5%. Furthermore, a reactor model for a carbonator is developed based on the Kunii鈥揕evenspiel鈥檚 model. A key parameter in the model is the particle distribution along the height of the reactor, which is estimated from experiments under stable operating conditions with constant bed inventory, reactor temperature and exit CO₂ concentration. The validated CFB carbonator model was used to simulate different operating conditions relevant for CO₂ capture from a power plant and from a cement plant. The results show that particle recirculation rates of 2鈥? kg/(m²s) or ratio of bed inventory to recirculation rates of 70鈥?76 s are sufficient for attaining 90% CO₂ capture efficiency depending on the inlet Ca to C ratio.