Numerical simulation of aqueous ammonia-based CO2 absorption in a sprayer tower: An integrated model combining gas-liquid hydrodynamics and chemistry
Numerical simulation of aqueous ammonia-based CO2 absorption in a sprayer tower: An integrated model combining gas-liquid hydrodynamics and chemistry
复制标题
喷雾塔中氨水 CO2 吸收的数值模拟：气液流体动力学和化学相结合的集成模型
DOI：
10.1016/j.apenergy.2017.11.054
复制
发表时间：
2018-02
期刊：
影响因子：
11.2
通讯作者：
Li Xiaochuan
中科院分区：
文献类型：
--
作者：
Xu Yin;Jin Baosheng;Zhao Yongling;Hu Eric J.;Chen Xiaole;Li Xiaochuan
CO2capture in the spray tower using aqueous ammonia solution has been proved a potential approach for the post-combustion CO2capture. To improve the performance of spray absorption, a new three-dimensional numerical model integrating the complex gas-liquid hydrodynamics and the chemistry of the NH3-CO2-H2O system has been proposed and developed in this paper. In the model, the gas-liquid hydrodynamics was simulated using the Euler-Lagrange method, while the chemistry of the NH3-CO2-H2O system, including both thermodynamic and kinetic characteristics, was modeled using user-defined modules implemented in the CFD package. Moreover, a laboratory scale spray absorption system was built, and run under various operating conditions were carried out in order to validate the model developed. Subsequently, the predicted results using different kinetic models were compared with the experimental results. It was found the model using Liu’s kinetics showed a better agreement with the experiments, especially when the liquid temperature and NH3concentration of solution vary. Furthermore, the validated model was used to study the fundamentals of spray absorption. It has been found that the gas temperature profile as well as gaseous CO2and NH3concentration profile depends on the velocity field, indicating the hydrodynamics should be considered when optimizing the design of reactor. It has also been found that the residence time of droplets increases with the increase of gas flow rate, leading to an increase in average droplets temperature and CO2loading, while the increase of ammonia concentration of solution could significantly improve the overall CO2mass transfer coefficient. When the solution temperature increases from 293 K to 303 K, the overall CO2mass transfer coefficient gradually increases, resulting in CO2removal efficiency improvement. However, when the solution temperature increases from 303 K to 313 K, the promotion of reverse reaction leads to the reduction of CO2removal efficiency. In addition, the increase of ammonia solution flow rate would mainly increase the interphase area and promote both CO2absorption and NH3escape. The model developed in this paper can be used to optimize the design and operation of such reactors in practice.
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影响因子：
4.2
作者：
Jeffery Kuntz and;A. Aroonwilas
通讯作者：
Jeffery Kuntz and;A. Aroonwilas
影响因子：
3.9
作者：
Jinzhao Liu;Shujuan Wang;H. Svendsen;Muhammad Idrees;Inna Kim;Chang-he Chen
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Jinzhao Liu;Shujuan Wang;H. Svendsen;Muhammad Idrees;Inna Kim;Chang-he Chen
影响因子：
3.9
作者：
V. Darde;W. V. Well;Philip L. Fosboel;E. Stenby;K. Thomsen
通讯作者：
V. Darde;W. V. Well;Philip L. Fosboel;E. Stenby;K. Thomsen
影响因子：
11.2
作者：
Se-young Oh;M. Binns;Habin Cho;Jin-Kuk Kim
通讯作者：
Se-young Oh;M. Binns;Habin Cho;Jin-Kuk Kim
影响因子：
9.8
作者：
Mani, Fabrizio;Peruzzini, Maurizio;Stoppioni, Piero
通讯作者：
Stoppioni, Piero