Dynamic modelling based on surface renewal theory, model validation and process analysis of rotating packed bed absorber for carbon capture
Dynamic modelling based on surface renewal theory, model validation and process analysis of rotating packed bed absorber for carbon capture
复制标题
基于表面更新理论的动态建模、旋转填充床碳捕集吸收器的模型验证和过程分析
DOI：
10.1016/j.apenergy.2021.117462
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发表时间：
2021
期刊：
影响因子：
11.2
通讯作者：
Luo X
中科院分区：
文献类型：
--
作者：
Luo X
旋转填料床可以减少溶剂型碳捕集的设备尺寸和成本。然而，由于旋转填料床内部流体的湍流流动以及传质单元的截面积随半径的变化，给旋转填料床的建模带来了困难。本研究旨在建立一个有效的旋转填料床吸收器的动力学模型，并通过稳态和动态模拟进行过程分析。创新地，基于传质过程的表面更新理论建立了动力学模型。该模型可以计算分布传质系数和其他与吸收性能有关的关键变量。对旋转填料床吸收器在实际工况下进行了实验，获得了新的实验数据，对模型进行了验证。以MEA为基准溶剂，对转速、液气比、溶剂浓度等关键操作变量对吸附性能的影响进行了工艺分析。结果表明，最佳MEA浓度为70% wt%左右。动态仿真结果表明，RPB吸收器对工艺变化有较快的响应。这种新的分布式动态模型和通过过程模拟获得的见解将促进旋转填料床技术在大规模碳捕获过程中的工业部署。
Rotating packed beds can reduce the equipment size and costs in solvent-based carbon capture. However, difficulties are encountered when modelling rotating packed beds due to turbulent fluid flows inside rotating packed beds and the cross-sectional area of mass transfer unit that changes with radius. This study aims to develop a validated dynamic model of a rotating packed bed absorber and to carry out process analysis through steady state and dynamic simulations. Innovatively, the dynamic model was developed based on surface renewal theory for mass transfer. The model can calculate distributed mass transfer coefficients and other key variables related with absorption performance. Experiments were carried out and new experimental data for the rotating packed bed absorber under realistic operating conditions were obtained for model validation. Process analysis about the effects of key operational variables such as rotating speed, liquid-gas ratio and solvent concentration on absorption performance was performed with benchmark MEA solvent. It was found that the optimal MEA concentration is around 70 wt%. Dynamic simulation results reveal that the RPB absorber has fast responses for process changes. This new distributed dynamic model and the insights obtained through process simulation will promote rotating packed bed technology towards its industrial deployment in large scale carbon capture processes.
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DOI：
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发表时间：
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期刊：
影响因子：
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作者：
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DOI：
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