初始分解压力对瓦斯水合物分解特性的影响

Effect of dissociation initial pressure on dissociation characteristics of gas hydrate

为提高储运过程中瓦斯水合物的稳定性,利用自主搭建的瓦斯水合物分解实验装置,在三种初始分解压力工况下,探究压力对瓦斯水合物分解率及分解速率的影响规律。结果表明:在实验尺度范围内,初始分解压力越大,分解率及瞬时分解速率峰值越小;分解过程中,瞬时分解速率呈先迅速上升、再下降的现象,峰值过后,由于分解吸热,热量无法及时供给,瞬时分解速率呈局部波动状态;分解后期,分解初始压力为1 MPa工况下,阶段平均分解速率更大,持续时间更长。该研究可为瓦斯水合物的储运技术提供理论参考。

This paper is an attempt to improve the stability of gas hydrate during storage and transportation by investigating the law behind the effect of pressure on the dissociation ratio and dissociation rate under three initial dissociation pressures using a self-built gas hydrate dissociation experiment device. The results show that, within the range of experimental scale, a larger initial dissociation pressure means a smaller dissociation ratio and instantaneous dissociation rate; the dissociation process involves an initial quick rise and a decrease in the instantaneous dissociation rate; the peak value is followed by a local fluctuation in the instantaneous dissociation rate due to dissociation absorption and lack timely heat supply and the later stage of dissociation involves a greater average dissociation rate of stage and a longer duration in the pres dissociation ence of the dissociation initial pressure of 1 MPa. This study could provide a theoretical reference for the storage and transportation technology of gas hydrate.