Rao Yongchao, Hu Yong, Wang Shuli, Zhao Shuhua, Zhou Shidong
Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213164, China.
School of Petroleum and Gas Engineering, School of Energy, Changzhou University, Changzhou, Jiangsu 213164, China.
ACS Omega. 2023 Jul 13;8(29):26301-26316. doi: 10.1021/acsomega.3c02549. eCollection 2023 Jul 25.
Aiming at the separation of mud and sand in natural gas hydrate, for the designed built-in twisted tape hydrocyclone, the numerical simulation method was used to study the effects of different types of built-in twisted tape and operating conditions on the internal flow field of the hydrocyclone, separation efficiency, and influence of hydrate particle size distribution. The research results show that the built-in twisted tape has the same swirling direction as the hydrocyclone, which is beneficial to improving the swirling intensity, and the ability to carry and separate solid particles is obviously enhanced. The built-in twisted tape hydrocyclone with a length of 300 mm has better separation efficiency and internal flow field stability. By changing the conditions of the inlet velocity and the initial concentration of hydrate particles, the comparison shows that when the inlet velocity is 8 m/s, the volume of mud and sand is 25%, the initial concentration of hydrate particles is 15%, and the built-in tape is 300 mm long. The tape hydrocyclone has the best separation efficiency. Compared with the basic hydrocyclone, the built-in twisted tape hydrocyclone with a length of 300 mm increases the separation efficiency of mud and sand by 7.49%, while the pressure drop only increases by 2.67%, showing the superiority of the built-in twisted tape structure.
针对天然气水合物中泥沙的分离问题，对于设计的内置扭带式水力旋流器，采用数值模拟方法研究了不同类型的内置扭带及操作条件对水力旋流器内部流场、分离效率以及水合物粒径分布的影响。研究结果表明，内置扭带与水力旋流器的旋流方向一致，有利于提高旋流强度，携带和分离固体颗粒的能力明显增强。长度为300mm的内置扭带式水力旋流器具有较好的分离效率和内部流场稳定性。通过改变入口速度和水合物颗粒初始浓度条件进行比较可知，当入口速度为8m/s、泥沙体积为25%、水合物颗粒初始浓度为15%且内置扭带长度为300mm时，该扭带式水力旋流器的分离效率最佳。与基础水力旋流器相比，长度为300mm的内置扭带式水力旋流器的泥沙分离效率提高了7.49%，而压降仅增加了2.67%，显示出内置扭带结构的优越性。
