二氧化碳置换甲烷水合物的实验研究

Experimental study on replacement of methane hydrates by CO2

关键词:  CH₄  水合物  置换率  CO₂ 

Key words:  methane  hydrate  replacement ratio  carbon dioxide

摘要:

CO₂置换CH₄水合物是一种开发CH₄的新方法,该方法既可以开发CH₄,又可以永久储存CO₂。通过自行优化设计的实验装置,研究了石英砂介质体系中温度和压力对置换效率的影响。实验结果表明,在置换压力为2.5 MPa,温度为273.15 K 、274.15 K 、275.15 K、276.15 K、277.15 K、278.15 K时,置换率分别为1.75%、6.99%、13.43%、5.53%、22.64%、44.90%；在温度为275.15 K,置换压力为2.0 MPa、2.5 MPa、3.0 MPa、3.5 MPa时,置换效率分别为37.11%、13.43%、3.44%、4.58%。可见,温度和压力都是推动CO₂置换CH₄水合物反应的影响因素。 

Abstract:

Replacement of methane hydrate by CO₂ is a new approach for the development of CH₄, and the method can develop CH₄ and store CO₂ permanently. By optimizing design of experiment device, the influences on displacement efficiency of temperature and pressure in the system of quartz sand media are studied. The experiment results show that the replacement rates are 1.75%, 6.99%, 13.43%, 5.53%, 22.64%, 44.90% respectively, the corresponding replacement temperature are 273.15 K, 274.15 K, 275.15 K, 276.15 K, 277.15 K, 278.15 K, and the CO₂ charge pressure is constant at 2.5 MPa. On the other hand, the replacement efficiency are 37.11%, 13.43%, 3.44%, 4.58% respectively, corresponding to the CO₂ charge pressure at 2.0 MPa, 2.5 MPa, 3.0 MPa, 3.5 MPa and the replacement temperature being constant at 275.15 K. Therefore, temperature and pressure are driving force factors of CO₂ replacement of CH₄ hydrate reaction.