SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2021, Vol. 40 ›› Issue (12): 65-77.DOI: 10.1016/j.cjche.2020.11.045

• Fluid Dynamics and Transport Phenomena • Previous Articles     Next Articles

Growth and aggregation micromorphology of natural gas hydrate particles near gas-liquid interface under stirring condition

Qihui Hu1,2, Xiaoyu Wang3, Wuchang Wang1,2, Yuxing Li1,2, Shuai Liu1,2   

  1. 1. Shandong Key Laboratory of Oil-Gas Storage and Transportation Safety, College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China;
    2. State Key Laboratory of Natural Gas Hydrates, Beijing 100028, China;
    3. Research Institute of Experiment and Detection, Petro China Xinjiang Oilfield Company, Karamay 834000, China
  • Received:2020-03-05 Revised:2020-09-06 Online:2022-01-14 Published:2021-12-28
  • Contact: Wuchang Wang,E-mail:wangwuchangupc@126.com
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51974349, U19B2012, 51991363), the Natural Science Foundation of Shandong Province (ZR2017MEE057), which are gratefully acknowledged.

Growth and aggregation micromorphology of natural gas hydrate particles near gas-liquid interface under stirring condition

Qihui Hu1,2, Xiaoyu Wang3, Wuchang Wang1,2, Yuxing Li1,2, Shuai Liu1,2   

  1. 1. Shandong Key Laboratory of Oil-Gas Storage and Transportation Safety, College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China;
    2. State Key Laboratory of Natural Gas Hydrates, Beijing 100028, China;
    3. Research Institute of Experiment and Detection, Petro China Xinjiang Oilfield Company, Karamay 834000, China
  • 通讯作者: Wuchang Wang,E-mail:wangwuchangupc@126.com
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (51974349, U19B2012, 51991363), the Natural Science Foundation of Shandong Province (ZR2017MEE057), which are gratefully acknowledged.

Abstract: To investigate the morphological evolution of the whole growth and aggregation processes of hydrate crystals near the gas–liquid interface, we used a high-pressure visual reactor with high-speed camera to capture the micromorphology of hydrate particles in a natural gas + pure water system with pressure from 2.6 to 3.6 MPa and sub-cooling from 4.7 to 6.23 ℃. The results showed that under low sub-cooling conditions, the amount and size of particles increased first and then decreased in the range of 0–330 μm, and the small particles always dominated. These particles can be roughly classified into two categories: planar flake particles and polyhedral solid particles. Then, the concept of maximum growth dominant particle size was proposed to distinguish the morphological boundary of growth and aggregation. In addition, the micro model was established to better reflect the effects of particle formation process and evolution mechanism near the gas–liquid interface under stirring condition. The results of this study can provide a guidance for flow assurance in multiphase pipeline.

Key words: Natural gas hydrate, Growth, Aggregation, Gas-liquid interface, Micromorphology, Physical model

摘要: To investigate the morphological evolution of the whole growth and aggregation processes of hydrate crystals near the gas–liquid interface, we used a high-pressure visual reactor with high-speed camera to capture the micromorphology of hydrate particles in a natural gas + pure water system with pressure from 2.6 to 3.6 MPa and sub-cooling from 4.7 to 6.23 ℃. The results showed that under low sub-cooling conditions, the amount and size of particles increased first and then decreased in the range of 0–330 μm, and the small particles always dominated. These particles can be roughly classified into two categories: planar flake particles and polyhedral solid particles. Then, the concept of maximum growth dominant particle size was proposed to distinguish the morphological boundary of growth and aggregation. In addition, the micro model was established to better reflect the effects of particle formation process and evolution mechanism near the gas–liquid interface under stirring condition. The results of this study can provide a guidance for flow assurance in multiphase pipeline.

关键词: Natural gas hydrate, Growth, Aggregation, Gas-liquid interface, Micromorphology, Physical model