Abstract:

Formation condition data for methane hydrate in ammonia-water system is very important for the process development and determination of operation condition for recycling the vent gas of ammonia synthesis using the hydrate method.This paper focuses on the formation conditions of methane hydrate in the presence of ammonia.Equilibrium data of methane hydrate in the temperature, pressure and concentration ranges from 277—281 K, 4—8 MPa, 1.018%, 3.171% and 5.278%(mole) ammonia, were obtained.The experimental results indicated that ammonia had an inhibitive effect on hydrate formation.The higher the concentration of ammonia, the higher the formation pressure for methane hydrate.The Chen-Guo hydrate model was extended to this methane hydrate system containing ammonia in water.It was shown that the model could be used to predict the formation pressure for methane hydrate.

摘要：

甲烷在氨水体系中生成水合物的实验数据对于开发水合法回收合成氨驰放气工艺以及操作条件的确定具有重要意义。本文测定了氨摩尔分数为1.018、3.171、5.278氨水溶液中甲烷气体水合物的生成条件。结果表明：氨的加入对甲烷水合物的生成起着明显抑制作用，而且随着氨浓度的增加，生成压力越高。采用Chen-Guo模型对甲烷在氨水中生成水合物的数据进行了计算，得到了较为满意的计算结果，平均误差为2.71%，说明Chen-Guo模型能够较好地预测该类体系的水合物的生成条件。