驱动力对瓦斯水合物晶体成核动力学的影响

Kinetics effect of driving force on gas hydrate crystal nucleation

为探寻驱动力在瓦斯水合物晶体成核过程中的动力学作用,利用自制的瓦斯水合物生长动力学实验系统,采用四种驱动力,将三种瓦斯气样进行水合物晶体成核动力学实验,根据各体系水合物晶体成核诱导时间变化规律,对驱动力的影响机理进行了分析.结果表明：在驱动力由1 MPa增至4 MPa的过程中,三种气样晶体成核诱导时间分别由1 MPa时的14、10、10 min缩短至4 MPa时的4、4、5 min,共计缩短50.0％ ～71.4％.驱动力的增大可以加快气体溶解,提高液相中气体含量,促进晶体成核的进行,且驱动力越大作用效果越明显.该研究可以为气体水合物技术应用的完善提供参考依据.

This paper seeks to delve more deeply into the kinetics effect of driving force on gas hydrate crystal nucleation process.The exploration is accomplished by performing hydrate crystal nucleation kinetics experiment on three gas samples using the self-made experiment system for gas hydrate growth kinetics and using four driving forces;and analyzing the influence mechanism of driving force according to the law behind the change in the induction time of each system hydrate crystal nucleation.The results show that the process in which the driving force increases from 1 MPa to 4 MPa is accompanied by three respective reductions from 14,10 and 10 min on 1 MPa to 4,4 and 5 min on 4 MPa,in the induction time of three gas samples crystal nucleation,suggesting a total reduction of 50.0％-71.4％.The increased driving force contributes to speeding up the gas solution,improving the gas content in liquid phase,promoting crystal nucleation,and producing bigger driving force and therefore a more significant action effect.The research may provide a reference basis for the perfect application of gas hydrate technology.