汽油碱洗过程中混合聚结器的计算流体力学模拟

CFD simulation of mixed coalescer on gasoline washing process with alkaline

NS混合聚结器是一种新型高效反应分离设备,对聚结器在汽油碱洗过程中的应用进行流体力学计算,考查各因素对油水两相在聚结器中聚结过程的影响,并对其内部流场进行模拟,以进一步优化聚结器结构。建立一个具有一根纤维丝的三维空间,选用k-ε湍流流动模型、离散相模型、混合物模型以及VOF模型对三维空间进行数值模拟,研究表面张力对聚结过程的影响和两相流之间的相互作用。结果表明,对NS混合聚结器采用液体或气体分布喷头初步分布,经过一段细分填料的再次分布,达到流通截面均匀分布,可以大大提高分离效率。

The NS mixed coalescer is a new type and high-effective separator used in reaction-seperation processes. A CFD about the device was done on the process of gasoline washing with alkaline by the Fluent software. The effects of every factors on the coalescence process of oil and water were studied. And its internal flow field was also simulated in order to optimize and improve the coalescer＇s design. The three-dimensional model with one fiber consists of k - ε turbulent model, discrete phase model, mixture model and volume of fluid （VOF） model. The effects of surface tension on coalescence process and interaction of two phase fluid were studied. The results show that using another gas-liquid distribution by a layer of refine packing, the separation efficiency could be increased greatly after a preliminary distribution to liquid or gas using sprinkle-nozzle.