Abstract:

The formation of methane hydrate from a mixed system of ice powders（154—300 μm）and sand（154—300 μm）was studied at 6.9 MPa and different temperatures.Its formation mechanism was also analyzed, and thereafter a kinetic model was proposed.The results showed that the hydration rate of ice powders (α) decreased with temperature and was 65% at 273 K, 51% at 269 K, and 42% at 263 K.The formation process could be divided into two stages,absorption and transfer stage,diffusion-control stage.The activation energy estimated from these data was 70.1 kJ·mol^-1.

摘要： 在自行搭建的实验台上利用恒压预冷法研究了6.9MPa下温度分别为273K，269K，263K时甲烷水合物在冰粉（154～300微米 ）与石英砂（154～300微米 ）混合物中的生成过程。结果表明冰粉的转化率 随温度的降低而降低，273K时 约为65%，269K时 约为51%,263K时 约为42%。在此基础上，深入分析了混合物中甲烷水合物的生成机理，将反应过程分为石英砂的吸附转化阶段和甲烷气的扩散控制阶段；并建立了定量的动力学模型，计算出冰粉石英砂混合物中甲烷水合物生成的活化能约为70.1KJ•mol-1。