【摘要】 天然气水合物(NGH)是存储于深海沉积物和冻土区域的新型洁净能源,注入CO2到NGH储藏置换开采天然气是经济和环保的新型NGH开采方法。CO2置换NGH研究从热力学和动力学证实都是可行的,置换反应自发进行,受扩散控制、NGH储藏环境、气体组分、注入CO2相态等因素影响。从实验和理论上分析置换原因、置换微观过程和置换的相态变化,阐述影响置换速率和置换效率的因素,提出置换安全性设计,为我国温室气体捕集、存储和NGH开采提供基础数据和理论支持。更多还原

【Abstract】 Natural gas hydrate(NGH) is a new clean energy,which is stored in the deep-sea sediments or the permafrost.Gas production from the NGH reservoir by injecting CO2 has been known as an economic and environmental-friendly method.Thermodynamics and dynamics researches have proved that it is feasible to exploit NGH by CO2 injection.The reaction is a spontaneous process,which is dominated by diffusion.Meanwhile,many other factors,such as the environment of NGH reservoir,the content of gas,the phase of CO2 injected,also have influence on the process.The mechanism of the replacement process including the micro-phenomenon of the reaction,the phase transformation and the factors affecting the reaction rate and the recovery efficiency have been investigated.The effective safety design of the replacement reaction has been proposed.The results can provide experimental data and theory foundation for the capture of the greenhouse gas and the exploitation of the NGH reservoir.更多还原