Study On Formation Kinetics Of Low-Concentration Mine Gas Hydrate And Influences Of Accelerators

The limitation of mine gas extraction using which caused environment pollution and wasting of resources is due to the low gas safety transportation, insufficiency of using technology and so on. Hydration technology provides a new attempt on fully using gas resources. The key to the industrialization of gas hydration curing storage technology is the rapid and stable generation of hydration, which has extremely significance for generating dynamics of low concentration of gas hydration.This paper makes use of visualization devices. Firstly, it carries out three experiments about hydration generation dynamics of low concentration gas in pure water. The results of the experiments show that the hydrate induction time is so long, which can reach as long as 700min. The results also show that the hydrate formation rate is so slow. These experiments are carried out under static system without accelerator.Secondly, it carries out low-concentration gas hydration generation kinetics about 9 experiments which add SDS. The consequence is that SDS shortens the macro induction time of hydrate formation and it also improves hydrate formation rate. The shortest induction time is 30min and the biggest formation rate is 3.395×10^-5m3·h^-1.Thirdly, it carries out researches about low-concentration gas hydrate formation kinetics experiments of 9 experimental systems which add THF and three groups of experimental system with SDS mixed with. The results show that THF improves the thermodynamic parameters of low concentration of gas hydrate formation, and it also shortens the macro inducement time of hydration formation, and accelerates the hydrate formation rate. The shortest hydrate formation inducement time is 14 min, and the fastest growth rate is 2.847×10^-5 m3·h^-1. The shortest hydrate formation induction time is 31 min under the THF-SDS compounded system. The formation rate of hydrate is faster than that has single accelerator in the same proportion of concentration.This paper focuses on the influences of the accelerator on low concentration gas hydration generating kinetics. It carries out 24 groups of experiments and it also gets lots of experimental data and image materials. At the same time, this paper gets the influencial rules of SDS, THF and THF-SDS accelerator system of low-concentration gas hydration generating kinetics. It establishes a foundation for the application industrialization of gas storage curing in technology.The paper has thirty-nine figures, eleven tables and eighty-two references.