天然气水合物形成条件的实验研究与理论预测

Experimental Study and Theoretical Prediction of Natural Gas Hydrate Formation Conditions

利用可视化高压流体测试装置在 2 73.5 8～ 2 88.96K的温度范围内测量了甲烷和合成天然气 (甲烷、乙烷和丙烷的混合物 )水合物的形成条件 .实验结果表明 ,温度越高 ,水合物形成的压力越高 ,而且压力的增加率越大 .根据vanderWaals Platteeuw的理想溶液等温吸附理论 ,应用气体水合物相平衡计算数学模型对实验体系水合物的形成条件进行了预测计算 ,取得了较好的结果 (甲烷水合物相平衡温度的平均相对误差为 0 .15 5 4 % ,合成天然气相平衡温度的平均相对误差为0 .2 4 0 3% ) .

A set of high pressure fluid visualization and measurement system is used to measure hydrate formation conditions of methane and synthetic natural gas (mixture of methane, ethane and propane) in the temperature range of 273.58～288.96 K. The experimental results show that the higher the temperature, the higher the equilibrium pressure, and the greater the slope of increasing pressure is. A calculation model for gas hydrate equilibrium has been developed based on van der Waals Platteeuw isotherm adsorption theory. The hydrates formation conditions of the experimental system are calculated based on the model. The results show that the calculation model can well depict gas hydrate equilibrium conditions (absolute average deviations in temperature (AADT) of methane hydrate is 0.155 4% , AADT of synthetic natural gas hydrate is 0.240 3%).