Mass transfer and energy consumption for CO2 absorption by ammonia solution in bubble column
Mass transfer and energy consumption for CO2 absorption by ammonia solution in bubble column
复制标题
鼓泡塔中氨溶液吸收CO2的传质与能耗
DOI：
10.1016/j.apenergy.2017.01.027
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发表时间：
2017-03-15
期刊：
影响因子：
11.2
通讯作者：
Yang, Yongping
中科院分区：
文献类型：
--
作者：
Chu, Fengming;Yang, Lijun;Yang, Yongping
氨溶液鼓泡塔吸收CO2是一种可行的燃烧后CO2捕集方法，研究鼓泡塔几何参数和运行参数对CO2捕集传质和能耗的影响，对CO2吸收节能和鼓泡塔设计具有重要意义。基于代表性单元体积法，建立了CO2捕集和氨逃逸的计算模型，并通过实验数据进行了验证，研究了CO2捕集过程的流体力学特性、传质性能和能耗。结果表明，在相同的CO2入口流速下，较高的塔高径比可以提高CO2捕集和氨逃逸的传质性能。塔底开孔数越少，塔内能耗越低;开孔孔径越大，塔内能耗越高。综合考虑能耗和CO2去除效率，推荐高径比为5.76。该研究可为CO2捕集的工业化应用以及氨逃逸的抑制提供可行的指导和建议，以获得更好的传质性能和节能效果。(C)2017爱思唯尔有限公司版权所有。
The CO2 absorption in the bubble column using ammonia solution has been proved a viable approach for the post-combustion CO2 capture, so it is of benefit to the energy saving of CO2 absorption and the bubble column design to clarify the impacts of the geometry and running parameters on the mass transfer and energy consumption of CO2 capture. Based on the representative elementary volume method, a computational model of both the CO2 capture and ammonia slip was developed and validated by the experimental data, by which the hydrodynamic characteristics, mass transfer performances and energy consumption in CO2 capture process were investigated. The results show that at the same inlet velocity of CO2, the higher height-to-diameter ratio of the column can improve the mass transfer performances of both the CO2 capture and ammonia escape. What's more, the energy consumption decreases with the reduced orifice number on the bottom of column, and increases as the orifice size increases. An optimal height-to-diameter ratio of 5.76 is recommended when taking both the energy consumption and CO2 removal efficiency into consideration. This work can provide the viable guidance and suggestions of the better mass transfer performance and energy saving for the industrial application of CO2 capture, as well as the inhibition of ammonia escape. (C) 2017 Elsevier Ltd. All rights reserved.