Methane hydrate production using a novel spiral‐agitated reactor: Promotion of hydrate formation kinetics

• Published in: AIChE Journal
• Main Authors: Zhang, Guodong, Shi, Xiaoyun, Wang, Fei
• Other Authors: National Natural Science Foundation of China, Taishan Scholar Project of Shandong Province
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2021
• Subjects: Methane hydrate
• Online Access: http://dx.doi.org/10.1002/aic.17423; https://onlinelibrary.wiley.com/doi/pdf/10.1002/aic.17423; https://onlinelibrary.wiley.com/doi/full-xml/10.1002/aic.17423

Abstract To enhance hydrate formation kinetics, we presented a novel spiral‐agitated reactor, where hydrates were synthetized in pure water systems, and fast hydrate kinetics was observed under extremely mild conditions. Hydrates can nucleate within 4 min under 3.5 MPa and 275.15 K at a rotating speed of 60 rpm, and large water‐to‐hydrate conversion (>85%) was obtained at a moderate condition of 4.85 MPa, 275.15 K, and 30 rpm with an average methane uptake of 139.78 V/V, demonstrating that pure water systems are feasible for hydrate‐based solidified natural gas (SNG) technology. Numerical simulations of flow fields inner the reactor were carried out, and four mechanisms behind the excellent promotion were proposed, dual‐agitation, two‐way convection, interfacial impact and micro bubbles, which significantly improve mass transfer, giving rise to fast hydrate nucleation and growth kinetics. These findings suggest extraordinary performance of spiral agitation, and this may pave way on the industrial application of hydrate‐based SNG technology.