Study On The Non Size Factors’impact On Oil-Water Separator Hydrocyclone By CFD

Deoiling hydrocyclone is being widely used by most oilfield enterprises for its virtue of quick, high efficiency and high processing capacity. Cyclone on the part of the structural parameters, physical parameters, operating parameters, and other single factor is more mature, was lucubrated in its influence and theory, also some models and theories were created. But the inner flow is complicated, many problems are urgent to be solved. As for the study for many size factors and non-size multi-factor separator, are rare.Application of computational fluid dynamics method, more factors such as size and the size factors synergy effect the performance of the separator separation is simulated. There are three kinds of configuration of hydrocyclone were widely used, so bicones hydrocyclone was adopted for its virtue. From the analysis we know that, the Reynolds number in the hydrocyclone is at the level, also internal exists high speed of outer and inner swirls flow, together with phase separation. So the Reynolds stress model, which has much consideration of the stress factors, is adopted to fit the flow condition. Also the mixture model which is suitable for oil-water separation is adopted too. Unsteady solver is being used for observing the oil migration. Pressure-velocity coupling calculation use SIMPLEC. Near wall used non-balance wall.By the numerical simulation method, there are three sets of model A, B and C, the average particle size of the inlet flow rate and oil droplets on the separation efficiency. The results showed that the separation efficiency increases with the increase of imports mean droplet diameter, the average oil The droplet particle size is too large, the droplet separation efficiency easily broken; separation efficiency is increased slowly with increasing inlet flow, inlet flow is in the range of3.96-5.04m3/h, the separation efficiency is little change.The split ratio and the separation efficiency of the relationship between different inlet oil concentration. The results showed that the separation efficiency as shunt ratio increases and elevated into a stable state after a decreasing trend. However, with the shunt ratio increases, the amount of water flowing from the overflow port will increase, increasing the burden of the subsequent oil processing apparatus. Therefore, the cyclone is an appropriate split ratio.Study the relationship between the pressure ratio and the split ratio. The results showed that the oil-water separation hydrocyclone pressure drop than with the split ratio increases, both by both by fitting a linear relationship. Thus, by adjusting the pressure in the actual productioncan easily adjust the ratio of the split ratio.Research on the relationship between the pressuredrop and the split ratio, the results showed that the overflow pressure drop with the split ratioincreases, both by fitting a linear relationship. And the bottom flow pressure drop is smallfalling trend along with the increase of split ratio. Shunt ratio on the overflow pressure dropsignificantly, and it has a little effect on the bottom flow pressure drop.The relationship between inlet flow rate and pressure drop. The results showed that therelationship between inlet flow and overflow pressure drop and a bottom stream pressure dropto meet the exponential relationship, the inlet flow of the hydrocyclone is an increase in thepressure drop along with the overflow voltage drop and a bottom stream increases.Parameters that affect the hydrocyclone separation performance is summed up in16,while each of these parameters can be almost infinite change, so the comprehensive effect ofvarious parameters or clearly describe each of the parameters corresponding to the variousindicators of change is very difficult, almost impossible to do such a comprehensiveexperiment. The first similarity theory and dimensional analysis method combines them into12integrated digital group, and then create separate quasi-logarithmic model. This12numberof group arrangements orthogonal experiment. For each factor, two levels were selected, anddesigned orthogonal table to provide guidance on the32-group simulating model creating. Byusing range analysis, we obtained the order of the wholly factors affect the strength of theseparation efficiency, and to identify the optimal combination. By Variance Analysis Method,the results showed that highly significant effect on the separation efficiency of the cyclonefactors, the ratio of the nominal diameter of the diameter of the overflow port and the swirler,the ratio of the nominal diameter of the diameter of the cylindrical section and the swirler, abottom stream inlet pressure and by analysis of variance the ratio of the inlet pressure, the oilconcentration of the treatment liquid with the treatment liquid density ratio and the Reynoldsnumber.By regression analysis, a high oil-water separation hydrocyclone multiple factorsmathematical model, and verify the accuracy of the model. Obtain the mathematical model,the application of the hydrocyclone, forecasting, inspection, amplification and optimal designhas a huge role in guiding. The above results make a reference for it is important for furtherresearch.