水合物法开发高寒地区湖盐设想相平衡验证

Verification of hydrate phase equilibrium for lake salt exploitation presumption in high-cold region by gas hydrate method

为了从相平衡条件角度验证气体水合物法开发我国高寒地区湖盐的设想,以van der Waals-Platteeuw模型为基础,结合杜亚和等提出的计算Langmuir常数的三参数方程和计算电解质溶液中水的活度的Pitzer方程,在国际上首次模拟了饱和NaCl溶液中一氟二氯乙烷(R141b)水合物的相平衡条件,并进行了实验验证。研究结果表明:10.1 kPa时饱和NaCl溶液中R141b水合物的生成温度为259.77 K,高于常压下饱和NaCl溶液凝固点250.81 K,也高于青海地区最冷月平均环境温度。因此,利用环境冷量实现气体水合物法节能开发我国高寒地区湖盐具备理论可能性。

In order to verify the presumption of lake salt exploitation in high-cold region of China by gas hydrate method from the viewpoint of hydrate phase equilibrium, the phase equilibrium of HCFC141 b （R141 b） gas hydrate in saturated NaCl solution was simulated by van der Waals-Platteeuw model, in which Langmuir constant and water activity were calculated by Three-Parameter Equation presented by Du Yahe, et al and Equation of Pitzer respectively, and confirmed by the experimental data. The results indicate that at 10.1 kPa, R141b gas hydrate is formed at 259.77 K in saturated NaCl solution, which is higher than 250.81 K, the freezing point of saturated NaCl solution at normal pressure, and the average ambient temperature of the coldest month in Qinghai region of China. Thus, it is possible to realize gas hydrate formation with environment cold energy, which is a potential energy-saving method for lake salt exploration in high-cold region of China.