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在半饱和含水态具有不同粒径、孔隙半径的人工、天然介质——硅胶、粉土内形成甲烷水合物,3支pF-meter探头测量反应过程中介质内垂直方向上不同位置处的基质势,据此计算分析介质内由水合物形成引起的水分消耗规律,进而探讨不同介质内甲烷水合物形成反应特征。通过实验发现,多孔介质的颗粒、孔径物理性质明显影响甲烷水合物的形成反应特征:水合物在具天然介质性质的粉土内的形成反应是一个长期持续过程,相反地,在硅胶内的形成反应过程较短且在硅胶内均匀形成;人工多孔介质——硅胶粉内的水合物形成反应速率维持恒定,天然多孔介质——粉土内的水合物形成速率由快减慢;甲烷气体由反应釜顶部注入,气体扩散进入介质顶层的速率最高,顶层介质内水合物形成速率略高于中、下层的形成速率;经历相同的形成条件,粉土内的最终水分转化率略高于硅胶内的最终水分转化率。
Methane hydrate was formed in artificial and natural media of silica and silt with different particle sizes and pore radii in half-saturated aqueous solution. Three pF-meter probes were used to measure the matrix potential at different positions in the vertical direction in the medium Based on this, the law of water consumption caused by hydrate formation in the analysis media was calculated, and then the formation reaction characteristics of methane hydrate in different media were discussed. The experimental results show that the physical properties of particles and pores in porous media obviously affect the formation reaction characteristics of methane hydrate. The formation reaction of hydrate in silt with natural medium is a long-term continuous process. On the contrary, the formation of The reaction process is short and uniform formation in the silica gel; artificial porous media - silica gel powder hydrate formation reaction rate remains constant, the natural porous medium - silt hydrate formation rate slowed down quickly; methane gas from the reaction The highest rate of gas diffusion into the top of the medium, the formation rate of hydrate in the top medium is slightly higher than the formation rate of the middle and lower layers. Under the same forming conditions, the final water conversion in the silt is slightly higher than that in the silica gel The final moisture conversion rate.