Abstract: Hydrate formation conditions of (CH₄+CO₂+H₂S) ternary sour natural gas mixtures in the presence of pure water were measured by using transparent sapphire cell device.The experimental temperature range was 274.2 to 299.7 K and pressure range was 0.58 to 8.68 MPa.The hydrogen sulfide and carbon dioxide contents in the gas mixtures varied from 4.95%(mol) to 26.62%(mol) and 6.81%(mol) to 10.77 %(mol), respectively.The hydrate phase equilibria data for sour natural gas in water were also predicted based on the Chen-Guo hydrate model and CSMHYD model.The calculation deviation increased, in general, with increasing H₂S concentration in the gas mixture and the Chen-Guo hydrate model gave better predictions.However, both models are subjected to further improvement for high H₂S content ［e.g. >10%(mol)］ systems.

Key words: 酸性天然气, 水合物, 相平衡, 模型

摘要： 采用高压全透明蓝宝石水合物相平衡装置，测定了(CH₄+CO₂+H₂S)三元酸性天然气在纯水条件下的水合物生成条件数据.实验温度范围为274.2～299.7 K，压力范围为0.58～8.68 MPa.混合物气体中H₂S和CO₂的浓度分别为 4.95%（mol）～26.62％（mol）和6.81%（mol）～10.77%（mol）.采用Chen-Guo水合物模型对实验数据进行了计算，结果表明，在不同的H₂S浓度下，Chen-Guo水合物模型的预测精度优于CSMHYD 模型.随着H₂S浓度的增加，计算的绝对偏差增大.针对H₂S浓度较高［＞10％（mol）］的体系，该两种水合物模型均有待改进.

关键词: 酸性天然气, 水合物, 相平衡, 模型