关键词: 酸性天然气, 水合物, 相平衡, 模型

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