甲烷水合物分解过程模拟实验研究

Experimental Research of Methane Hydrate Dissociation

以甲烷为主要成分的天然气水合物被看作是一种新型的油气资源，研究水合物分解特征有助于水合物的开采利用。采用实验模拟的方法进行了甲烷水合物分解率研究，实验中采用了等容升温分解和不同粒径多孔介质体系常压分解等方法研究水合物的分解特征。从P=4．5MPa下进行的等容分解实验结果发现，当釜内温度为5．18-8℃时水合物快速分解并一直持续到13℃分解结束，且等容分解过程中反应釜内压力与釜内温度呈良好的函数对应关系。常压分解研究使用了5种不同粒径沉积物作为反应介质，在T=1℃的条件下进行水合物分解实验，结果发现粒径在0．063－0．35mm范围的沉积物对水合物的分解速率为1．11×10^-5－2．41×10^-5mol／s，但分解速率并没有随粒径大小发生有规律的变化。

Gas hydrates are considered to be a new kind of resources, it is critical to know the hydrate dissociation process to make good use of this resource. In this paper, simulation experiment is used to investigate the methane hydrate dissociation. There are two kinds of dissociation methods, one is isovolumetric dissociation and the other is normal pressure dissociation. The isovolumetric dissociation experiment is carried out at p = 4.5 MPa, and the dissociation speed is fast during 5.18 -8 ℃, and the reaction cell pressure has good relation with temperature. In the normal pressure dissociation, we use five different porous media to investigate the porous media effect during hydrate dissociation. The study is carried out at T = 1 ℃ and we find that the dissociation speed is among 1.11 × 10^-5 -2. 41 × 10^-5 mol/s when the porous media radius are among 0. 063 -0. 35 mm, but the speed is not proportional to the radius.