Comparison of the water change characteristics between the formation and dissociation of methane hydrate and the freezing and thawing of ice in sand  

作　　者：Peng Zhang Qingbai Wu Yingmei Wang 

机构地区：[1]State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions, Environmental and Engineering Research Institute,Chinese Academy of Sciences, Lanzhou 730000, Gansu, China

出　　处：《Journal of Natural Gas Chemistry》2009年第2期205-210,共6页天然气化学杂志（英文版）

基　　金：supported by the CAS Knowledge Innovation Key Project (Grant No. KZCX2-YW-330);the National Science Fund FosteringTalents in Basic Research to Glaciology and Geocryology (Grant No. J0630966).

摘　　要：Hydrate formation and dissociation processes are always accompanied by water migration in porous media, which is similar to the ice. In our study, a novel pF-meter sensor which could detect the changes of water content inside sand was first applied to hydrate formation and dissociation processes. It also can study the water change characteristics in the core scale of a partially saturated silica sand sample and compare the differences of water changes between the processes of formation and dissociation of methane hydrate and freezing and thawing of ice. The experimental results showed that the water changes in the processes of formation and dissociation of methane hydrate were basically similar to that of the freezing and thawing of ice in sand. When methane hydrate or ice was formed, water changes showed the decrease in water content on the whole and the pF values rose following the formation processes. However, there were very obvious differences between the ice thawing and hydrate dissociation.

关 键 词：methane hydrate ICE formation and dissociation process freezing and thawing process water change 

分 类 号：TQ171.411[化学工程—玻璃工业] P744.4[化学工程—硅酸盐工业]