Experimental studies of the formation and dissociation of methane hydrate in loess  

作　　者：Guanli Jiang Qingbai Wu Jing Zhan 

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

出　　处：《Journal of Natural Gas Chemistry》2010年第3期217-223,共7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 Fostering Talents in Basic Research to Glaciology and Geocryology (Grant No. J0630966);the Special Project Fund of State Key Laboratory of Engineering of Frozen Soil(Grant No. SKLFSE-ZQ-07)

摘　　要：In order to study the nature of gas hydrate in porous media,the formation and dissociation processes of methane hydrate in loess were investigated.Five cooling rates were applied to form methane hydrate.The nucleation times of methane hydrate formation at each cooling rate were measured for comparison.The experimental results show that cooling rate is a significant factor affecting the nucleation of methane hydrate and gas conversion.Under the same initial conditions,the faster the cooling rate,the shorter the nucleation time,and the lower the methane gas conversion.Five dissociating temperatures were applied to conduct the dissociation experiment of methane hydrate formed in loess.The experimental results indicated that the temperature evidently controlled the dissociation of methane hydrate in loess and the higher the dissociating temperature,the faster the dissociating rates of methane hydrate.

关 键 词：methane hydrate LOESS FORMATION DISSOCIATION NUCLEATION CONVERSION gas volume percentage 

分 类 号：P744.4[天文地球—海洋科学] O613.3[理学—无机化学]