水合物法开发高寒地区湖盐的相平衡研究

STUDY ON PHASE EQUILIBRIUM OF GAS HYDRATE FOR SALT EXPLOITATION IN HIGH-COLD REGION

高寒地区年平均气温为水合物的生成提供了天然的温度条件,也为水合物法节能开发高寒地区湖盐提供了可能。基于此,提出了水合物法开发高寒地区湖盐的新方法;以van der Waals-Platteeuw模型为基础,利用Pitzer方程与杜亚和与郭天民提出的三参数方程分别计算电解质溶液中水的活度和Langmuir常数,预测了饱和NaCl溶液中HCFC141b水合物的相平衡条件,并进行了实验验证;发现利用环境冷量实现气体水合物法开发湖盐具有实际可行性;研究结果对应用高效节能方法开发我国高寒地区湖盐有重要价值。

In high-cold region of China, average temperature not only makes it available for gas hydrate formation without additional refrigeration components, but also implies the possibility of salt exploitation by gas hydrate technology, which inspires the idea of salt exploration by gas hydrate technology. Subsequently, in saturated NaCl solution, phase equillibrium of HCFC141b gas hydrate were predicted by van der Waals-Platteeuw Model, in which Langmuir Constant and water activity was calculated by Three-Parameter Equation presented by Du Ya ＆ Guo Tianmin and Equation of Pitzer respectively, and confirmed by experimental data. Comparing with the freezing point of saturated NaCl solution, phase equillibrium demonstrates the feasibility of salt exploitation by gas hydrate method. The results are of great value for salt exploration by highly effective energy-saving technology.