水的形态与甲烷水合物的生成  

WATER FORM AND METHANE HYDRATE GENERATION

作　　者：黄犊子[1] 樊栓狮[2] 

机构地区：[1]中国科学技术大学热科学和能源工程系 [2]中国科学院广州能源所气体水合物实验室

出　　处：《天然气工业》2004年第7期29-31,共3页Natural Gas Industry

基　　金：国家自然科学基金重点资助项目 (5 9836 2 30 ) (5 0 176 0 5 1);国家基础研究规划基金资助项目 (G2 0 0 0 0 2 6 30 6 )

摘　　要：针对自然界中天然气水合物在海底和大陆永冻区形成条件不同 ,通过实验研究了水的不同形态和甲烷气反应生成甲烷水合物的过程。实验结果显示甲烷与冰粉反应要比甲烷与水反应容易得多 ,一方面得益于反应物间接触面积的增大 ,另一方面受温度变化的影响。使用 0 .7～ 0 .8K/h的温度驱动条件 ,冰粉与甲烷气体迅速反应 ,证明甲烷气能够直接与固体冰反应生成水合物 ,成核诱导期较短。同时文章指出在甲烷和冰反应时 ,存在两个反应高峰期 ,这两个高峰期中间是气体分子向固体内部扩散的过程。而水和甲烷气体反应时 ,扩散过程占主要部分 ,诱导期漫长。冰和水分别与甲烷反应的对比可以用来考虑评估天然气水合物在不同地质区域的储量和预测其分布状况。In consideration of the different conditions of forming natural gas hydrates in ocean bottom and permafrost, the generation process of methane hydrate was studied through the experiments of the reaction of the water with different forms to methane. The experimental result indicated that the reaction of methane to ice powder was much easier than that of methane to water, because of the enlarged contact area among the reactors and the influence of the change in temperature. Under the temperature driving condition of 0.7-0.8 K/h, the ice powder was rapidly reacted with methane, which proved that methane could be directly reacted with solid ice to generate hydrate, the core-formed inducing period being short. It is pointed out in the paper that there exist two peak periods in the process of the reaction of methane to ice, and the period between the two peaks is the process of methane's diffusing into the ice cores. The reaction of methane to water is mainly a diffusion process, the core-formed inducing period being very long. The comparison between the two reactions may be used for evaluating the natural gas hydrate reserves in different geological regions and predicting their distribution.

关 键 词：甲烷水合物 天然气水合物 沉积物 恒温系统 导热系数 

分 类 号：P744[天文地球—海洋科学]