Mechanism of Gas Hydrate Formation in Flowing Subcooled Water

对过冷水强制循环回路中天然气水合物的形成进行了尝试。采用容积为500cc的小型压力容器作为试验容器，通过观察窗观察地层现象。实验过程中，容器内停滞气相压力保持在0.4或0.45 MPa，以丙烷气为客气。容器下部的水通过流量传感器从容器底部泵送到容器顶部，然后以水柱的形式排到液-气界面。用该方法证实了天然气水合物的形成。水合物形成所需的时间从600秒到1800秒不等，这取决于过冷程度、水流速率和气相压力。

An Attempt has been made for the formation of gas hydrate in forced circulation loop of subcooled water. A small pressure vessel with 500 cc in volume was used as the test vessel, and the formation phenomena were observed through the viewing windows. The stagnant gas phase pressure in the vessel was kept at 0.4 or 0.45 MPa during the experiment, and the propane gas was used as the guest gas. The water in the lower part of the vessel was pumped from the bottom to the top of the vessel via a flow sensor, then it was drained to the liquid-vapor interface in a form of water column.The formation of the gas hydrate has been confirmed using the method. Time required for the hydrate formation was ranged from 600 to 1800 seconds, depending on the degree of subcooling, water flow rate, and the gas phase pressure.