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Study on methane hydrate formation in gas–water systems with a new compound promoter

机译：用新型复合促进剂研究气水系统中甲烷水合物的形成

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The effects of a new promoter on the growth kinetics of methane hydrates were investigated using a visualized constant-pressure autoclave. The experimental results show that when the 1#, 2# and 3# unit promoter was compounded at a ratio of 2?:?1?:?1, the induction time was shortened greatly from 30 h to 0.64 h compared to the no promoter situation. Meanwhile, there was a larger amount of hydrate formation, and final hydrate volume fraction was 83.652%. Then, the hydrate formation characteristics under different additive dosages (500 ppm, 1000 ppm, 2000 ppm, 5000 ppm) and different subcooling degrees (2.5 °C, 3.5 °C, 4.5 °C, 5.5 °C, 6.5 °C) were investigated. The new promoter at these 4 concentrations could effectively shorten the induction time. And the higher the concentration, the smaller the induction time (0.22 h at 5000 ppm). It was also found that gas consumption and hydrate production rate increased first and then decreased with increasing promoter dosage. Finally, the optimal dosage was determined to be 2000 ppm, at which the induction time was shortened to 0.52 h, and the final hydrate volume fraction was 85.74%. Under the dosage of 2000 ppm and the subcooling degree of 6.5 °C, the shortest induction time (0.29 h) and the maximum formation rate (20.950 ml h ~(?1) ) were obtained among all the experimental conditions in this work. Moreover, the greater the subcooling degree, the faster the hydrate nucleation, and the shorter the induction time. However, if the subcooling degree was too high, a hydrate layer formed rapidly at the gas–liquid interface in the autoclave, which would hinder hydrate formation and lead to the reduction of hydrate volume fraction to 60.153%. Therefore, a reasonable selection of the proportioning of promoters, dosage of the promoter and formation temperature could significantly promote the formation of hydrates. The findings in this work are meaningful to hydrate associated applications and can provide useful references for the selection of hydrate promoters.
机译：使用可视化恒压高压釜研究了新型促进剂对甲烷水合物生长动力学的影响。实验结果表明，当1＃，2＃和3＃单元启动子以2 ::？1？：？1的比例混合时，与无启动子相比，诱导时间从30 h大大缩短到0.64 h。情况。同时，水合物形成量更大，最终水合物体积分数为83.652％。然后，研究了在不同添加剂剂量（500 ppm，1000 ppm，2000 ppm，5000 ppm）和不同过冷度（2.5°C，3.5°C，4.5°C，5.5°C，6.5°C）下的水合物形成特性。 。这四个浓度的新启动子可以有效地缩短诱导时间。浓度越高，诱导时间越短（5000 ppm时为0.22 h）。还发现，随着启动子剂量的增加，气体消耗和水合物产生速率先增加然后降低。最后，确定最佳剂量为2000 ppm，诱导时间缩短至0.52 h，最终水合物体积分数为85.74％。在这项工作的所有实验条件下，以2000 ppm的剂量和6.5°C的过冷度，可获得最短的诱导时间（0.29 h）和最大形成速率（20.950 ml h〜（？1））。此外，过冷度越大，水合物成核越快，诱导时间越短。但是，如果过冷度过高，则会在高压釜的气液界面处迅速形成水合物层，这会阻碍水合物的形成并将水合物的体积分数降低至60.153％。因此，合理选择促进剂的比例，促进剂的用量和形成温度可以明显促进水合物的形成。这项工作中的发现对于水合物相关的应用是有意义的，并且可以为水合促进剂的选择提供有用的参考。

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