摘要
为了解决油气混输过程中气液混合不均匀,混合效率低的问题,文章采用计算流体动力学方法对气液混合器进行混合效率分析及结构优化并通过实验验证混合性能。分析了不同气液比和液相流速下的流场规律以及结构优化后的混合效果。结果表明,在气液比为40%、液相流速为2 m/s时混合段沿程气相体积分数标准差逐渐下降,混合均匀度不断升高,在出口截面处标准差取最小值0.042;环形气体腔上过多的喷气口数目会降低气相流速,影响气液混合效率,在喷气口数目为4时,具有最佳的混合效果;在混合段内增设一对前后交叉放置的“V”型扰流板有利于形成新湍流,增强两相间扰动,使出口截面上的气相体积分数标准差降至0.021,不均匀系数降至0.023,有效提升气液混合的均匀性,当扰流板张角为45°距混合段入口60 mm时,混合效率最佳。实验数据与模拟结果具有较好的拟合性,在不同的液相流速下呈现的规律相同,误差满足实验要求,验证了模拟结果的准确性。该研究结果为气液混合器结构设计及优化提供了理论支撑。
In order to solve the problems of uneven gas-liquid mixing and poor mixing efficiency in the process of oil and gas mixing,this paper uses computational fluid dynamics method to carry out numerical simulation analysis of internal flow field and structural optimization of gas-liquid mixer and verify the mixing performance through experiments.The results show that when the gas-liquid ratio is 40%and the liquid flow rate is 2 m/s,the standard deviation of gas volume fraction along the mixing section decreases gradually,and the mixing uniformity increases continuously.The minimum standard deviation at the outlet section is 0.042.Excessive number of nozzles on the annular gas chamber will reduce the gas flow rate and affect the gas-liquid mixing efficiency.When the number of nozzles is 4,the mixing effect is the best.Installing a pair of V-shaped baffles in a front-rear cross layout within the mixing section enhances turbulence and gas-liquid interaction,reducing the outlet gas-phase volume fraction standard deviation to 0.021 and the non-uniformity coefficient to 0.023.Optimal mixing occurs at a 45°baffle angle,60 mm from the inlet.Simulation results closely match experimental data across various liquid flow rates,confirming the model's accuracy and providing theoretical support for mixer design and optimization..
作者
谭欢
邓国强
黄天成
华剑
王林虎
詹望宇
TAN Huan;DENG Guoqiang;HUANG Tiancheng;HUA Jian;WANG Linhu;ZHAN Wangyu(Drilling&Production Engineering Technology Research Institute,CNPC Chuanqing Drilling Engineering Co.,Ltd.,Xi'an,Shaanxi 710018,China;Institute of Mechanical Structure Strength and Vibration,Yangtze University,Jingzhou,Hubei 434023,China;Tongling Nonferrous Metals Group Co.,Ltd.,Tongling,Anhui 244000,China)
出处
《钻采工艺》
北大核心
2025年第4期177-184,共8页
Drilling & Production Technology
关键词
气液混合器
混合效率
结构优化
混合均匀度
两相流
air and liquid mixer
mixing efficiency
structural optimization
mixing uniformity
two-phase flow
