CT图像法观测不同粒径多孔介质中水合物分布

Research of Xenon Hydrate Distribution in Different Particle Sizes Porous Media During Hydrate Formation and Dissociation Based on X-CT

以不同粒径Al_2O_3球作为多孔介质,结合耐高压反应釜进行氙气水合物生长和分解实验。运用高分辨X-CT进行氙气水合物生长与分解过程微观观测,研究了其在不同粒径多孔介质孔隙内的分布规律。结果表明:在粒径1.5 mm介质中,水合物生长初期以接触模式为主;中期以接触与胶结共存模式为主;后期以胶结模式为主。与1.5 mm介质比较,500μm多孔介质中水合物生长速率更快。在氙气水合物分解过程中,对于同一种粒径的多孔介质,水合物在多孔介质中的垂向动态分布规律具有明显的差异,呈现出由介质上侧向下侧逐步分解的趋势。

Based on the high resolution X-ray computerized tomography(CT),the pore scale distribution of xenon hydrate in different particle size Al2O3 were observed and discussed. According to the results,in the 1.5 mm media,at the first stage of hydrate formation,hydrates are mainly growing as a contacting model. At the last stage of hydrate formation,the hydrate grains cement the sediment particles,described as a cementing model. In the middle stage of hydrate formation,the main hydrate distribution is contacting and cementing model. Compared with the 1.5 mm Al2O3,the hydrate grows faster in 500 μm Al2O3. Besides, the distribution of xenon hydrate in different position of the same particle size Al2O3 during hydrate formation and dissociation was not the same.