摘要
为探究微型双蜗式气液旋流分离器内部流场特征和分离特性,基于Fluent软件建立分离器的物理模型,对气相流场分布和液滴颗粒的运动轨迹进行了数值模拟,考察了液滴粒度和进口速度对分离效率的影响规律。研究发现:排气管进口附近短路现象明显,切向速度和轴向速度沿径向均匀分布,径向速度数量级较小且分布规律较为复杂,静压和动压分布对称性良好;气液两相流动过程中,大部分液滴受离心力的作用运动到分离器边壁实现分离,部分液滴由于短路和返混作用向上经排气管逃出;研究范围内,液滴粒度越大,分离效率越高;分离器对应的临界液滴粒度为1.0μm,粒度≥1.0μm液滴的分离效率随进口速度的增加而增大,最高可实现100%的分离效果;粒度小于1.0μm的液滴颗粒,分离效率随进口速度的增加先增大后减小,选择合适的进口速度可达到分离效率的最大值。研究结果可为高效微型气液旋流分离器的开发提供参考。
In order to study the internal flow field and separation characteristics of micro double volute gas-liquid cyclone separator,a physical model of the separator was established by Fluent software.Based on numerical simulations for the distribution of gas flow field and the trajectory of droplet particles,the influences of droplet size and inlet velocity on the separation efficiency were investigated.It is found that short circuit phenomenon is obvious near the inlet of exhaust pipe,the tangential velocity and axial velocity are distributed uniformly along the radial direction,radial velocity is of small order of magnitude with complex distribution,and the static pressure and dynamic pressure are distributed symmetrically.In the process of gas-liquid two-phase flow,most droplets move to the side wall of the separator under the action of centrifugal force to be separated,and some droplet particles escape upwards via the exhaust pipe due to short circuit and back mixing.Within the scope of the study,larger droplet size contributes to higher separation efficiency.The critical droplet size of the separator is 1.0μm.For droplets equal to or larger than 1.0μm,the separation efficiency increases with the increase of inlet velocity;for droplets smaller than 1.0μm,the separation efficiency increases first and then decreases with the increase of inlet velocity and the highest separation efficiency could be reached if proper inlet velocity is selected.The study results provide reference for the development of high-efficiency micro gas-liquid cyclone separators.
作者
李腾
孙治谦
王朝磊
耿坤
王振波
Li Teng;Sun Zhiqian;Wang Chaolei;Geng Kun;Wang Zhenbo(College of New Energy,China University of Petroleum(East China))
出处
《石油机械》
北大核心
2022年第6期98-105,共8页
China Petroleum Machinery
基金
山东省重大科技创新工程项目“基于工业级连续流反应技术的化工装备系统研究及产业化应用”(2019JZZY010508)
中石油重大科技合作项目“天然气水合物开采气液分离技术及配套装置研究”(ZD2019-184-004-002)。
关键词
微型
双蜗式
气液分离
数值模拟
流场分布
分离效率
micro
double volute
gas-liquid separation
numerical simulation
flow field distribution
separation efficiency
作者简介
第一作者:李腾,生于1998年,现为在读硕士研究生,研究方向为多相流动与分离。地址:(266580)山东省青岛市。E-mail:1343003957@qq.com;通信作者:孙治谦,E-mail:sunzhq@upc.edu.com。
