Estimation of ultra-stability of methane hydrate at 1 atm by thermal conductivity measurement  

作　　者：Dongliang Li Deqing Liang Shuanshi Fan Hao Peng 

机构地区：[1]Guangzhou Institute of Energy Conversion, CAS, Guangzhou 510640, Guangdong, China [2]Key Laboratory of Renewable Energy and Gas Hydrate, CAS, Guangzhou 510640, Guangdong, China [3]Key Laboratory of Enhanced Heat Transfer and Energy Conservation, MOE, Guangzhou 510640, Guangdong, China [4]Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Journal of Natural Gas Chemistry》2010年第3期229-233,共5页天然气化学杂志（英文版）

基　　金：supported by the National Basic Research Program of China (2009CB219504);National Natural Science Foundation of China(50706056);Guangdong Province Science and Technology Program(2009B030600005)

摘　　要：Thermal conductivity of methane hydrate was measured in hydrate dissociation self-preservation zone by means of the transient plane source（TPS） technique developed by Gustafsson.The sample was formed from 99.9%（volume ratio） methane gas with 280 ppm sodium dodecyl sulfate（SDS） solution under 6.6 MPa and 273.15 K.The methane hydrate sample was taken out of the cell and moved into a low temperature chamber when the conversion ratio of water was more than 90%.In order to measure the thermal conductivity,the sample was compacted into two columnar parts by compact tool at 268.15 K.The measurements are carried out in the temperature ranging from 263.15 K to 271.15 K at atmospheric pressure.Additionally,the relationship between thermal conductivity and time is also investigated at 263.15 K and 268.15 K,respectively.In 24 h,thermal conductivity increases only 5.45% at 268.15 K,but thermal conductivity increases 196.29% at 263.15 K.Methane hydrates exhibit only minimal decomposition at 1 atm and the temperature ranging from 263.15 K to 271.15 K.At 1 atm and 268.15 K,the total gas that evolved after 24 h was amounted to less than 0.71% of the originally stored gas,and this ultra-stability was maintained if the test was lasted for more than two hundreds hours before terminating.Thermal conductivity of methane hydrate was measured in hydrate dissociation self-preservation zone by means of the transient plane source（TPS） technique developed by Gustafsson.The sample was formed from 99.9%（volume ratio） methane gas with 280 ppm sodium dodecyl sulfate（SDS） solution under 6.6 MPa and 273.15 K.The methane hydrate sample was taken out of the cell and moved into a low temperature chamber when the conversion ratio of water was more than 90%.In order to measure the thermal conductivity,the sample was compacted into two columnar parts by compact tool at 268.15 K.The measurements are carried out in the temperature ranging from 263.15 K to 271.15 K at atmospheric pressure.Additionally,the relationship between thermal conductivity and time is also investigated at 263.15 K and 268.15 K,respectively.In 24 h,thermal conductivity increases only 5.45% at 268.15 K,but thermal conductivity increases 196.29% at 263.15 K.Methane hydrates exhibit only minimal decomposition at 1 atm and the temperature ranging from 263.15 K to 271.15 K.At 1 atm and 268.15 K,the total gas that evolved after 24 h was amounted to less than 0.71% of the originally stored gas,and this ultra-stability was maintained if the test was lasted for more than two hundreds hours before terminating.

关 键 词：methane hydrate SELF-PRESERVATION dissociation velocity thermal conductivity 

分 类 号：P744.4[天文地球—海洋科学] TM263[一般工业技术—材料科学与工程]