摘要
通过检测置换过程中气相组分的变化情况，研究了CO2注入压力对置换CH4水合物中CH4气体程度与速率的影响．在274．15K时，研究了3．97，4．56，4．84，6．26MPa4个不同的CO2注入压力下置换反应的进行情况．实验表明，当置换反应结束时，分别有20．0％，26．4％，44．9％，9．1％的CH4被置换出来．在一定压力范围内（3．97～4．84MPa），CO2气体注入压力越高，被置换出来的CH4量越大，但当CO2气体注入压力接近液化压力时，CH4回收量反而明显下降．
The effect of the injection pressure of carbon dioxide on the recovery extend and the exchange rate of methane released from methane hydrate is studied by analyzing the concentrations of methane and carbon dioxide in gas phase at different reaction time. Four pressures （3. 97 MPa, 4. 56 MPa, 4.84 MPa, and 6. 26 MPa） are selected at temperature of 274. 15 K. At the end of reaction, the methane in gas phase is 20.0 mol%, 26.4%, 44.9%, 9.1%（molar fraction）. At a pressure range of 3.97 to 4.84 MPa, the higher is the injection pressure, the faster is the replacement rate. But when injection pressure approaches the vapor pressure of liquid carbon dioxide at 274.15 K, the amount of recovered methane drops sharply instead.
出处
《武汉理工大学学报（交通科学与工程版）》
2008年第3期547-550,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
中国科学院知识创新工程项目资助(批准号:KGCX2-SW-309-03)
关键词
CH4
水合物
CO2
置换开采
methane hydrate
carbon dioxide
replacement exploitation
