The undersea separation was widely used in the petroleum industry to improve the efficiency and keep the well pressure. High gas?liquid ratio condition exists in offshore gas field frequently and for this condition, a novel two-stage gas and liquid cylindrical cyclone was designed. In order to increase the separation efficiency, some parts had been added in the separator. The size parameters of the separator were designed by using effective volume transformation methods, and a method for diameter determination was also proposed based on the characteristics of liquid drop breaking in swirl field. This determination described the liquid drop’s changing shape and breaking in the gas cyclone field and the critical relative velocity of the gas phase and liquid phase when the liquid drops started to break had also been calculated. The model based on the pressure field by the solution of Navier?Stocks equation and had also been verified by the experiments which had measured the liquid drops diameters by using Malvern laser particle size analyzer and the data from model and experiments kept high consistency. Different turbulence models, different meshing schemes and different discrete formats had been compared in order to choose the best numerical simulation plan and this plan also had been validated by existing experimental data. The characteristics of asymmetry were analyzed by CFD about the internal flow field of the simplified model and the influence of structural parameters and operational parameters were also obtained. The results of the models showed that it was very diffcult for oil drops in different diameters to break in the gas cyclone fields. The results of the numerical simulation showed that the length of the separator had little effect on the asymmetry characteristics of the internal flow field and the inlet velocity and the ratio of the length and width of inlet would not make the internal flow field become unstable.
Zhaoming YANG Jianlei CHEN Yunrui HAN Limin HE Xiaoming LUO
. Design of two-stage swirling gas?liquid separator and simulation of flow field characteristics[J]. The Chinese Journal of Process Engineering, 2018
, 18(6)
: 1198
-1209
.
DOI: 10.12034/j.issn.1009-606X.218124
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