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.

中文翻译：

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使用新型螺旋搅拌反应器生产甲烷水合物：促进水合物形成动力学

为了增强水合物形成动力学，我们提出了一种新型螺旋搅拌反应器，在纯水系统中合成水合物，并在极其温和的条件下观察到快速水合物动力学。水合物可以在 3.5 MPa 和 275.15 K 下在 60 rpm 的转速下在 4 min 内成核，并且在 4.85 MPa、275.15 K 和 30 rpm 的中等条件下获得了较大的水-水合物转化率（> 85%）。平均甲烷吸收量为 139.78 V/V，表明纯水系统适用于基于水合物的固化天然气 (SNG) 技术。对反应器内部流场进行数值模拟，提出了双搅拌、双向对流、界面碰撞和微气泡四大促进作用机理，显着提高了传质效果，产生快速的水合物成核和生长动力学。这些发现表明螺旋搅拌具有非凡的性能，这可能为基于水合物的 SNG 技术的工业应用铺平道路。