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Experimental and modeling phase equilibria of gas hydrate systems for post-combustion CO2 capture
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2018-12-01 , DOI: 10.1016/j.jtice.2018.11.007
Luling Li , Shuanshi Fan , Qiuxiong Chen , Guang Yang , Jinzhou Zhao , Na Wei , Yonggang Wen

Accurate knowledge of hydrate phase equilibria is of fundament in terms of the hydrate-based gas separation process (HBGS) for post-combustion CO2 capture. In this work, we experimentally investigated the phase equilibria of flue gas during hydrate-based CO2 capture. Additionally, new experimental data for dissociation pressure of flue gases with different CO2 concentration were reported. Subsequently, a more accurate thermodynamic model combining Cubic-Plus-Association Equation of State (CPA-EoS) and Chen-Guo model was employed to predict the dissociation pressure of flue gases. To better perform the hydrate equilibria, a temperature dependent binary interaction parameter kij and new parameters for Chen-Guo model were developed. The results showed that the general tender of the new experimental data was in line with previous results. In addition, an improved accuracy was noticed for the mixtures with an Average Absolution Deviation (AAD) approximately to 4.07%, through comparing the predicted results with the experimental data. Especially, in terms of the gases with a CO2 concentration less than 85.32%, the improvement was significant. Lastly, this work also utilized the thermodynamic model and the Clausius-Clapeyron equation to predict the dissociation enthalpies of CO2 hydrate. The results showed that the prediction results were located in the margin of experimental data, which demonstrated the thermodynamic model proposed in our work was capable of describing the gas hydrate behavior with high accuracy.



中文翻译:

用于燃烧后CO 2捕集的天然气水合物系统的实验和模型阶段平衡

就燃烧后CO 2捕集的基于水合物的气体分离过程(HBGS)而言,对水合物相平衡的准确了解至关重要。在这项工作中,我们通过实验研究了基于水合物的CO 2捕集过程中烟气的相平衡。另外,报道了具有不同CO 2浓度的烟气的离解压力的新实验数据。随后,结合立方-加-缔合状态方程(CPA-EoS)和Chen-Guo模型的更精确的热力学模型被用来预测烟道气的离解压力。为了更好地执行水合物平衡,需要温度相关的二元相互作用参数k ij并为Chen-Guo模型开发了新的参数。结果表明,新的实验数据的总体招标与以前的结果一致。此外,通过将预测结果与实验数据进行比较,可以发现平均吸收偏差(AAD)约为4.07%的混合物具有更高的准确度。特别地,就CO 2浓度小于85.32%的气体而言,改善是显着的。最后,这项工作还利用热力学模型和Clausius-Clapeyron方程来预测CO 2的离解焓水合物。结果表明,预测结果位于实验数据的边缘,这表明我们的工作提出的热力学模型能够高精度地描述天然气水合物的行为。

更新日期:2018-12-01
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