瓦斯水合物诱导时间影响因素实验研究

Experimental study on influence factors for induction times of gas hydrates

为探究多因素条件下瓦斯水合物诱导时间及其规律,利用自主设计的高压可视水合实验装置,由成核动力学实验确定了气体组分、NaCl质量分数及驱动力三种因素对瓦斯水合物诱导时间影响的程度,采用极差法和方差法对实验数据进行分析。结果表明:随着瓦斯中甲烷减少、丙烷增加,水合物的平均诱导时间先减少后增加;随着NaCl质量分数或驱动力Δp增加,水合物平均诱导时间逐渐减少;气样G_2、NaCl质量分数3.5%、驱动力1.5 MPa条件下瓦斯水合物诱导时间最短;驱动力Δp较气体组分对水合物诱导时间影响显著性强,NaCl质量分数的显著性较弱。

This paper is motivated by the need to explore the impact factor of induction time for gas hydrate. The exploration consists of investigating the effects of the gas component, NaCl concentration and driving force Δp on the induction time of gas hydrate using the independently designed visual high- pressure experimental hydration apparatus; determining the influential intensity and significance levels of the three factors on the induction time by nucleation kinetics experiments; and analyzing the experimental data by range and variance methods. The study demonstrates that the decreased methane and increased propane leads to an initial increase and subsequent decrease in the induction times of the gas mixtures; an increase in NaCl concentration or the driving force Δp is accompanied by a gradual reduction in the av- erage induction times of hydrates; gas hydrate has the shortest induction time in the case of G2 gas sam- ple, 3.5 % NaCl concentration and 1.5 MPa driving force Δp ; and the driving force Ap exerts a more significant effect on the induction time than does the gas component, while NaCl concentration has a wea- ker significance.