| Gravitational separator has been widely used because of its advantages such as simple structure, easy operation, stable working, low maintenance charge, etc. However, the volume of traditional gravitational separator is always very huge, and it is also inefficient. So bringing in all kinds of advanced coalescent packings and improving the separating efficiency are the promising tendencies. In this paper, we do experiments on seven different kinds of coalescence packings and compare the separating efficiencies. At last we single out the best coalescent packing through searching for the reasons on material property and separator's performance respectively. At last we get the best coalescence packing through researching the material properties and separator's performance respectively.In this study, emulsion is prepared by means of mixing and valve shearing and the comparative studies are also done. The relationship between the stability of emulsion and the emulsifier type, stirring rate, emulsifier concentration, and oil concentration was studied with the jar tests study. The shear experiments research the relationship between the stability of emulsion and fluid flow rate, emulsifier concentration, oil concentration, valve opening. The results indicate the sodium dodecyl benzene sulfonate (SDBS) has better emulsifying effect on the oil used in the experiment. The stirring rate, shear rate and the fluid flow rate determine the settling time of emulsion, while do not affect the average grain diameter of oil drop. The emulsifier concentrations determine the average grain diameter of oil drop. The average grain diameter of oil drop has nothing to do with the oil concentration.In this experiment, through measuring the difference between oil/water content of inlet and oil/water content of outlet, the effect of coalescence packings on oil and water separation was analyzed. Before putting the coalescence packings the experiments were did under different oil concentration and different oil layer thickness. When the operating condition is the same, the oil content of outlet at the 10% entrance oil content is less than that of 20% entrance oil content the experiment was did when the oil layer thickness is 2cm,5cm and 10cm, and the results indicated that when the oil layer thickness is small, it does not meet the requirements when the flow rate is large. When the oil layer is larger, the resident time of oil is longer and the resident of water is shorter, as a result the oil droplet in the water flowing out of the separator before floating upward to the oil layer. Therefore, a reasonable oil reservoir thickness of 5cm was selected to do the later experiment. Seven kinds of packings were tested at the same oil layer thickness, and the result showed that the ceramic corrugated plate packing is the best.Particle diameter has been analyzed by using laser particle analyzer and high-speed video camera in the experiment. The separating efficiency of separator with different coalescent packings and effect factors of separating efficiency have also been evaluated in virtue of grain diameter mass separation efficiency from microcosmic view angle. The oil diameter in the inlet of the separator has been shot by the high-speed video camera. We compare the particle size distribution which we analyzed with that measured by high-speed video camera, and then analyze the reasons of the difference are the frame limit, the edge blur. These are the reasons that particle size distribution has been shot by the high-speed video camera are bigger than the laser particle analyzer.
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