| 摘要: |
| 本文从理论方面探究制冷剂气体水合物的相平衡分解条件，应用经典的van der Waals-Platteeuw水合物热力学模型预测了R22，R23，R125和R143a水合物的分解条件。在模型预测过程中，应用SRK状态方程对气相和液相进行了模拟计算。该模型预测结果与实验数据误差分别为1.21%，2.84%，2.23%和1.02%，并得到了制冷剂水合物相平衡图及四相平衡点。同时对制冷剂水合物分解热进行了计算，对比发现Ⅱ型制冷剂水合物的分解热大于Ⅰ型。 |
| 关键词: 气体水合物 制冷剂 相平衡 热力学模型 |
| DOI： |
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| 基金项目:国家自然科学基金(51176145)资助项目。 |
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| Thermodynamic Model for Predicting Phase Equilibrium of Refrigerant Gas Hydrates |
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Yang Hang, Li Pu, Zhang Longming, Li Na
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| (School of Chemical Engineering and Technology, Key Laboratory of Thermo-fluid Science and Engineering, Ministry of Education) |
| Abstract: |
| This study aims to investigate the phase equilibrium of refrigerant gas hydrates based on thermodynamic theory. A thermodynamic model based on the van der Waals-Platteeuw model is used to predict the hydrate dissociation conditions. Refrigerants modeled in this study include R22, R23, R125 and R143a. The SRK equation of state is employed for modeling the vapor and fluid phases. The deviation values between model predictions and the experimental data are 1.21%, 2.84%, 2.23% and 1.02%, respectively. The phase equilibrium diagram of refrigerant hydrates and quadruple points are obtained. Decomposition heat of refrigerant hydrates is calculated. It is found that the decomposition heat of type Ⅱ refrigerant hydrates is higher than that of type Ⅰ. |
| Key words: gas hydrate refrigerant phase equilibrium thermodynamic model |
