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利用自制可视化试验装置,研究了初始压力7 MPa下,3种浓度的四氢呋哺(THF)溶液(0.10 mol·L~(-1)、0.20 mol·L~(-1)和0.30mol·L~(-1))对两组高体积分数瓦斯气样Ⅰ和Ⅱ的水合物临界生成热力学条件的影响,获取了瓦斯水合物生成过程的压力-温度-时间曲线。对水合物临界生成相平衡模型与试验值进行了比较。结果表明,高浓度的THF溶液能够很好地改善水合物热力学条件,THF溶液浓度为0.30 mol·L~(-1)时,气样Ⅰ和Ⅱ的瓦斯水合物临界生成压力比相平衡计算压力分别小0.41 MPa和0.06 MPa,对改善高体积分数瓦斯水合物生成热力学条件效果最好。
Using a self-made visual test apparatus, three solutions of THF (0.10 mol·L -1, 0.20 mol·L -1) and 0.30 mol·L -1 L ~ (-1)) on the thermodynamic properties of the hydrate critical formation conditions of two high volume fraction gas samples Ⅰ and Ⅱ, and the pressure-temperature-time curve of gas hydrate formation was obtained. The phase equilibrium model of hydrate critical generation was compared with the experimental values. The results show that the high concentration of THF solution can improve the thermodynamic conditions of hydrates. When the concentration of THF solution is 0.30 mol·L -1, the critical pressures of gas hydrate in samples Ⅰ and Ⅱ are calculated by phase equilibrium pressure Which are 0.41 MPa and 0.06 MPa respectively, are the best for improving the thermodynamic conditions of gas hydrate formation with high volume fraction.