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显微镜下THF水合物结晶过程研究对天然气水合物微观形成过程及水合物流动安全机理探索具有重要的指导意义。文中在不同初始条件下,用金相显微镜研究了四氢呋喃(THF)水溶液结晶过程。结果表明过冷度为9.4℃THF水合物生成过程中水合物形态变化先呈丝状,如波浪般迅速推进生成,最后发展呈絮状充斥整个观察体系,水合物平均形成速率先增大后减小;实验条件下过冷度太大,会导致溶液积累大量的水合物核,从而导致水合物大量生成并瞬间聚集在一起;THF溶液中添加铜丝后,会加快体系传热以及THF水合物核的形成,从而导致水合物反应诱导期缩短,生成速率增大,但是不改变水合物生成过程中呈现的水合物形态。
The study of the crystallization process of THF hydrate under the microscope has an important guiding significance for the exploration of the formation process of gas hydrate and the safety mechanism of hydrate flow. In this paper, under different initial conditions, the crystallization process of tetrahydrofuran (THF) aqueous solution was studied by metallographic microscope. The results show that the morphology of hydrate is filamentous when the undercooling is 9.4 ℃, and the hydrate formation takes place in the form of filaments, and finally the flocculation floats the entire observation system. The average hydrate formation rate first increases and then decreases Under the experimental conditions, the degree of supercooling is too large, which leads to the accumulation of a large number of hydrate nuclei in the solution, resulting in a large number of hydrate formation and instantaneous aggregation; adding copper wire to THF solution will speed up heat transfer and THF hydrate The formation of nuclei led to the shortening of the induction period of hydrate reaction and the increase of the formation rate, but did not change the hydrate morphology during hydrate formation.