| 摘要: |
| CO2置换开采天然气水合物是集温室气体储存和天然气水合物开采于一体的方法,已引起研究者的广泛关注。针对CO2置换法技术,本文利用建立的气体水合物相平衡测试装置,在273.7K～284.2K温度范围内测试了3组CO2-CH4混合气体的三相共存(H-V-LW)和较高四相点Q2(H-LW-LC-V)的相平衡特性。研究结果给出了实验温度范围内混合气体水合物随甲烷含量提高的相平衡压力特性,以及该混合气体水合物体系较高四相点Q2(H-LW-LC-V)稳定区的边界和混合气体水合物融化开始和融化结束时的Q2点。数据表明,混合气体中随着甲烷相对二氧化碳浓度的增加,Q2点随之增加,四相共存状态压力和温度范围也随着扩大。 |
| 关键词: CO2 CH4 置换 混合气体水合物 相平衡 较高四相点 |
| DOI： |
| 分类号:O642.4 |
| 基金项目:中山大学-BP液化天然气教育培训与研究中心合作项目(编号:99103-9390001);广东省教育厅液化天然气及低温技术重点实验室项目(编号:39000-3211101) |
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| Experiment on Phase Equilibrium of Carbon Dioxide and Methane Mixed Hydrates |
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Jiang Chengming, Yang Tao, Guo Kaihua
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Engineering College of Zhongshan University,Guangzhou 510006).
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| Abstract: |
| Replacing of CH4 from hydrate with CO2 as an integrated way of greenhouse gas storage and exploiting natrual gas hydrates attracted more and more attention.To replace CH4 from hydrate with CO2,the phase equilibrium data for CO2-CH4 mixed hydrates are needed.In this paper,the three-phase (H-V-LW) line and upper quadruple(H-LW-LC-V)points (Q2) phase equilibrium properties of the mixed hydrate with different composition were measured by using a visual experimental apparatus in range of 273.7K～284.2K.The results of increasing equilibrium pressure with methane composition and the upper quadruple phase coexist range were provided,and the upper quadruple states of start and end melting for the CO2-CH4 mixed hydrates were identified.It is found that the equilibrium temperature and pressure range of Q2 four-phase coexistence are increased as the concentration of methane increases. |
| Key words: CO2 CH4 replacement mixed hydrates phase equilibrium upper quadruple points |
