【摘要】 在天然气水合物原位钻采工艺中，液固分离是保证其过程性能的重要环节。水力旋流器以其分离效率高、结构简单而极具应用优势。但当前在水合物液固分离的基础理论、表征方法和性能改进等方面认知尚浅。基于国内外研究成果，阐述旋流器关键结构参数(柱段长度、锥角、进口形式、溢/底流管直径)、介质条件和物性参数(进口速度、颗粒粒径及浓度)对天然气水合物原位钻采液固旋流器分离性能的影响过程与机制，分析旋流器的多相流动与分离过程中内部流场中速度、压力及分离性能的规律，对比多相流动力学数值模拟的方法及其有效性，提出现有旋流器的关键技术经济性能指标，并将其用于改进策略的评价，可为天然气水合物原位钻采液固旋流分离技术提供参考。更多还原

【Abstract】 In the in-situ drilling process of natural gas hydrate, liquid-solid cyclonic flow separation is an important part to ensure the performance of the process. Hydrocyclone is highly advantageous for high separation efficiency and simple structure. However, the basic theories, characterization methods and performance improvements of natural gas hydrate liquid-solid separation have not yet been known effectively and systematically. Based on the research results at home and abroad, the influence of key structural parameters(cylindrical length, cone angle, inlet forms, vortex finder and the spigot), media conditions and physical parameters(inlet velocity, particle diameter and inlet particle volume fraction) on the separation performance of the hydrocyclone were described. In the multiphase flow and separation process of the hydrocyclone, the laws of velocity, pressure and separation performance in internal flow fields were analyzed. Methods for numerical simulation of multiphase flow dynamics and their effectiveness were compared. The results can provide a reference for natural gas hydrate in-situ drilling and extraction liquid-solid cyclonic flow separation technology.更多还原