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首页> 外文期刊>American journal of fluid dynamics >CFD Modelling of a Horizontal Three-Phase Separator: A Population Balance Approach
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CFD Modelling of a Horizontal Three-Phase Separator: A Population Balance Approach

机译：水平三相分离器的CFD建模：总体平衡方法

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The performance and internal multiphase flow behavior in a three-phase separator was investigated. The separator considered represents an existing surface facility belonging to Abu Dhabi Company for Onshore Oil Operations ADCO. A first approach, using the Eulerian-Eulerian multiphase model implemented in the code ANSYS FLUENT, assumed mono-dispersed oil and water secondary phases excluding the coalescence and breakup phenomena. Interesting results were obtained but noticeable discrepancies were caused by the simplifying assumption. Therefore, it was decided to use the Population Balance Model PBM to account for the size distribution, coalescence, and breakup of the secondary phases which were the key limitations of the Eulerian-Eulerian model. The separator configuration, with upgraded internals, was represented with the maximum of geometrical details, contrary to the simplifying approach adopted in most of the previous numerical studies, to minimize the sources of discrepancies. In the absence of field information about the droplet size distribution at the inlet of the separator, three different Rosin-Rammler distributions, referred to as fine, medium, and coarse distributions were assumed based on the design values reported in the oil industry. The simulation results are compared with the scares laboratory, field tests, and/or semi-empirical data existing in the literature. The coarser size distributions, at the inlet, enhanced the separator performance. It was found that the inlet device, called Schoepentoeter, generates a quasi-mono-dispersed distribution under the effect of coalescence which persists throughout the whole volume of the separator. The mean residence time obtained from the simulations agreed well with some of the existing approaches in the literature. Finer distributions generate higher mean residence times. The classical sizing approach, based on representative values of droplet diameter and settling velocity remains limited although useful for design guidelines. In contrast, CFD presents the advantage of calculating the flow variables locally which yields a more complete and detailed picture of the entire flow field. This is very useful for understanding the impact of the internal multiphase flow behaviour on the overall performance of the separator.
机译：研究了三相分离器的性能和内部多相流动行为。所考虑的分离器代表阿布扎比公司现有的地面设施，用于陆上石油作业ADCO。第一种方法是，使用在代码ANSYS FLUENT中实现的欧拉-欧拉多相模型，假设单分散的油和水第二相不包括聚结和破裂现象。获得了有趣的结果，但是由于简化的假设导致了明显的差异。因此，决定使用人口平衡模型PBM来解释次级阶段的大小分布，合并和分解，这是Eulerian-Eulerian模型的主要局限性。与内部大多数情况下采用的简化方法相反，分隔件配置（内部零件已升级）具有最大的几何细节，以最大程度地减少差异来源。在没有关于分离器入口处的液滴尺寸分布的现场信息的情况下，根据石油工业中报告的设计值，假定了三种不同的松香-拉姆勒分布，分别称为细分布，中分布和粗分布。将模拟结果与文献中存在的恐慌实验室，现场测试和/或半经验数据进行比较。入口处较粗的尺寸分布增强了分离器的性能。已经发现，被称为Schoepentoeter的入口装置在聚结的作用下产生了准单分散的分布，该分布在整个分离器的整个体积中都存在。从模拟获得的平均停留时间与文献中的某些现有方法非常吻合。更精细的分布会产生更高的平均停留时间。尽管基于滴定直径和沉降速度的代表性值的经典上浆方法仍然有用，但对设计指南很有用。相比之下，CFD的优势在于可以局部计算流量变量，从而获得整个流场的更完整和详细的图像。这对于理解内部多相流动行为对分离器整体性能的影响非常有用。

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