不同驱动力下瓦斯气体水合物的诱导时间分布

为探寻不同驱动力条件影响瓦斯水合物形成诱导时间的分布规律,利用全透明高压反应釜开展多组分瓦斯混合气(CH_4-CO_2-C_3H_8-N_2-O_2)水合成核动力学实验。基于四种不同驱动力下诱导时间实验结果,结合二次多项式,建立不同组分气体诱导时间和驱动力经验关系。研究发现,同一实验体系中瓦斯水合物形成诱导时间随驱动力增大而缩短;不同浓度瓦斯水合物形成诱导时间分布差异较大。基于偏摩尔吉布斯自由能随驱动力变化规律,初步探讨驱动力对多组分瓦斯水合物成核过程影响机理。分析认为:在一定范围内驱动力对瓦斯水合物成核过程具有促进作用.而驱动力过高将抑制水合物晶核的形成。

Induction time distribution of gas hydrate under different driving forces

This paper is focused on evaluating the effect of the driving force on the induction time distributions during the hydrate formation for different gas mixtures containing CH4-CO2-C3 H8-N2-O2.The evaluation consists of conducting hydrate crystallization experiments using the visual high pressure cell and forming the empirical relationships between the induction time and the driving force,based on the induction times under four driving forces and combined with the second-order polynomial.The study finds that the induction time tends to decrease with an increase in driving force for the same gas mixture,while there occurs a large difference among the induction time for different gas mixtures.The paper also discusses the mechanism of the effect of the driving force on the induction time during the hydrate crystallization process using the variations of the partial molar Gibbs free energy with the driving force.The analysis concludes that the driving force promotes the hydrate crystallization in a range while the higher driving force inhibits the hydrate crystallization.