Research on the stability of the methane hydrate during the formation-dissociation and the storage-transportation

对甲烷水合物的行为进行了实验研究，并对现象进行了验证。(1)在模拟海底压力和温度的条件下，观察到卵石或砂岩中甲烷水合物的固有生成，并加速了水合物的生成。(2)在压力和一定的过冷温度下，压力容器中的水和甲烷气体发生了水平接触。在两种材料的界面上观察到水合物的自然生成。(3)对两种材料进行强制对流和搅拌。几个小时后，大量的白色原子核出现在水中，并向上移动，然后似乎凝固成水合物。在形成过程中，通过温度变化观察到水合物核心内部的热产生。对水合物的分解采用了加热和减压两种方法。出现了不同的行为。快速减压会导致水的冻结。(5)用我们的小型装置再现了水合物的自保效应。在冰冻后-大约-10度。C，在常压下保持，不能观察到解离。在此基础上，提出了以节能、节材、高效、储存、操作可控为目标的水合物生成、固相萃取、储存和分解的复杂体系。

Experimental researches of the methane hydrate behavior and the confirmation of phenomena have been carried out. Those include the following items.(1)Inherent formation of methane hydrate in the pebbles or sands under the simulated conditions of pressure and temperature of sea bottom and the accelerated formations of hydrate were observed.(2)Horizontal contact of the water and the methane gas was given in the pressure vessel under the pressure and a certain level of sub-cooled temperature. Natural formation of hydrate at the interface of the both material was observed.(3)Forced convection and stirring were given to the two materials. After several hours lots of white nuclei made appearance in the water and moved upward then seemed solidified into hydrate there. During the formation the heat production was observed inside the hydrate core by temperature change. The heat absorption is essentially necessary.(4)Two methods of the heating and the decompression were applied for dissociation of the hydrate. Different behaviors occurred. The rapid decompression will lead to the freezing of water.(5)The self preservation effect of the hydrate was reproduced by our small apparatus. After freezing up-to about -10 deg. C and maintaining under the atmosphere pressure, dissociation could not be observed. Burning of gas proved the SPE.(6)The sophisticated system of the formation, SPE, storage and dissociation of the hydrate was thought up based on this research, target was energy and material saving, efficient performance, the stabilized storage and controllable operation.