氨法脱碳模拟中热力学模型的比较

Comparison of Thermodynamic Models for Carbon Capture with Aqueous Ammonia

针对在已有研究中关注最多的两种热力学模型,e-NRTL模型与Pitzer模型,比较了二者在预测NH3-CO2-H2O体系的热力学性质的准确性,并基于示范装置的运行条件和实验结果,比较了二者对吸收过程和解吸过程预测的准确性.基于本文研究,建议在利用Aspen Plus模拟氨法脱碳过程时,对吸收塔采用e-NRTL模型,对解吸塔采用Pitzer模型.

Aqueous ammonia based CO2 capture technology has been regarded as a promising technology for CO2 emission control. In the modeling study of this process with Aspen Plus commercial software, it is crucial to choose an appropriate thermodynamic model Research in open literature has focused on two thermodynamic models, e- NRTL model and Pitzer model. In this paper, the two models were adopted separately and the ammonia based CO2 capture process was simulated. The thermodynamic behavior of NH3-CO2-H2O system was predicted and compared with experimental results. What＇s more, the absorption and regeneration processes of ammonia based CO2 capture were simulated and compared with the results of pilot plant trials. It is revealed in this study that e-NRTL model should be used for the absorber while Pitzer model should be used for the stripper.