| In the process of blending light hydrocarbon to decrease viscosity,SK-static mixer can effectively improve the mixing effect and utilization rate of light hydrocarbon,and the structure of inlet mixing light hydrocarbon determines the flow state of light hydrocarbon in the casing annulus,which has influence on the mixing effect.In this paper,designed cone inlet and orifice inlet mixing light hydrocarbon based on the structure of normal inlet,and research the performance of static mixer with pump's suction by numerical simulation.In the calculation process,used core-hexahedral meshes and pressure boundry.Calculated the Reynods number and the pressure drop of the static mixer according to industry standards and forms,and identified the laminar flow in the static mixer and the pressure of inlet and outlet.Based on the parameters of the flow field simulated in the static mixer found that the static mixer can effectively improve the mixing effect.And light hydrocarbon can't reach the inlet blending light hydrocarbon with a small pressure,and a waste of resources of light hydrocarbon with a pressure over excessive.In addition,the eccentric and inclined casing annulus will decrease the mixing effect,so eccentricity and inclination is not conducive to blending light hydrocarbon to decrease viscosity,especially the eccentricity above 0.5 or the inclination ration above 0.67.Researched the performance of static mixer with conical inlet and orifice inlet,and found that conical inlet more effectively improve the heavy oil and light hydrocarbon volume ration and the mixing effect than nomal structure.The conical inlet with cone length is half of annulus' width has the best performance.When all the holes concentrate in a row,the more holes,mixing better,but the mixing effect slightly worse than the conical inlet's.The result of numerical simulation can provide theoretical and technical guidance for further enhance mixing effect and utilization rates of light hydrocarbon in dilution. |
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