Experimental study on the growth characteristics of natural gas hydrate formation on suspended gas bubbles in distilled water and tap water

doi:10.16085/j.issn.1000-6613.2017.01.017

Abstract

Abstract: The visualization experiments of natural gas hydrate formation on suspended gas bubble surfaces were carried out under the condition of initial temperature of 275.2K. The influence of impurities on the nucleation time,growth time and growth shape of natural gas hydrate were analyzed and discussed. The results showed that the distilled water and tap water had little effect on hydrate nucleation time and growth time,but the hydrate film formed on the surfaces of the gas bubble in the distilled water was relatively smooth,dense and tends to crack,but the crack would be quickly filled with new hydrate crystals. There were many holes cannot form hydrate on the hydrate film of gas bubbles because of the tap water contains many impurities. Aqueous solution with SDS significantly reduced the nucleation time and growth time of the hydrate formation on the suspended gas bubble surfaces,improved the rate of hydrate formation and had a great influence on the hydrate growth morphology. The natural gas hydrate crystals formed on the suspended gas bubble surfaces in the aqueous solution with SDS were darker and the texture was more smooth and dense under the same driving force conditions.

Key words: natural gas, bubble, film, hydrate, impurity, growth morphology

摘要： 在275.2K条件下开展了静止悬浮气泡表面形成天然气水合物的可视化实验研究，分析探讨了水中杂质对天然气水合物的成核时间、生长时间和生长形态的影响。研究结果表明：蒸馏水和自来水对水合物的成核时间和生长时间影响不大，但是在蒸馏水中的悬浮气泡表面形成的水合物膜表面比较光滑致密，且易出现裂缝并重新生成水合物晶体；在自来水中由于杂质离子的存在，气泡表面水合物膜有许多窟窿无法生成水合物；添加表面活性剂的水溶液能显著缩短悬浮气泡表面形成水合物的成核时间和生长时间，提高了水合物的生成速率，且对水合物的生长形态也有很大的影响。在相同驱动力条件下，添加表面活性剂的水溶液中悬浮气泡表面形成的天然气水合物晶体颜色更加深暗，质地也更光滑致密。

关键词: 天然气, 气泡, 膜, 水合物, 杂质, 生长形态

CLC Number:

XIE Yubo, LIU Daoping, YANG Liang, YANG Meng. Experimental study on the growth characteristics of natural gas hydrate formation on suspended gas bubbles in distilled water and tap water[J]. Chemical Industry and Engineering Progree, 2017, 36(01): 129-135.

谢育博, 刘道平, 杨亮, 杨梦. 蒸馏水和自来水中悬浮气泡表面天然气水合物生长特性的实验研究[J]. 化工进展, 2017, 36(01): 129-135.

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