Numerical Stimulation Of Deoiling Hydrocylone

Deoiling hydrocyclone is being widely used by most oilfield enterprises for its virtue ofquick, high efficiency and high processing capacity. The single factor, such as the structure ofoverflow outlet, was lucubrated in its influence and theory, also some models and theorieswere created. But the inner flow is complicated, many problems are urgent to be solved, suchas the flow field and the separation proprieties changes caused by cone length. As for the studyfor multi structures dimensions are rare.There are three kinds of configuration of hydrocyclone were widely used, so biconeshydrocyclone was adopted for its virtue. Based on the theory of hydrodynamics, velocity ofaxial, tangent and radial velocity are analyzed in hydrocyclone. Tangent velocity has a hugerelationship with oil droplet’s centrifugal force. Axial velocity shows the movement of droplettoward to the top outlet. The radical velocity shows the speed of the droplets movementtoward to the center. Analysis based on the three velocity simulation of flow field in order tounderstand the performance of separator.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 tofit the flow condition. Also the mixture model which is suitable for oil-water separation isadopted too. Unsteady solver is being used for observing the oil migration. Pressure-velocitycoupling calculation use SIMPLEC. Near wall used non-balance wall.By the numerical simulation method, to simulate the split ratio on separation efficiency,the results indicate that separation efficiency increased along with the increasing of the splitratio, and then entered a steady state. Small split ratio can save more energy which facilitatesthe subsequent processing. Therefore, the cyclone is exists an appropriate split ratio.According to the six columns length models simulation, the result showed that the lengthshad no significant effect on the separation performance. The function of the column length isstabilizing manifold, a little column length can reduce the loss of frictional resistance.Five arithmetical series models about the large conical length changes were created forsimulating. The results showed that the longer the length is, the lower the efficiency. By analyzing the velocity, we got some conclusions. Both of the conical inner vortical and theouter vortical tangent velocity are reducing while the large conical length is increasing. But,both of the conical outer vortical axial and inner vertical tangent velocities are not be effected.Five arithmetical series models about the small conical length changes were created forsimulating. The results showed that there is a quadratic function between the length and theefficiency; in this case, there exists an optimal length to meet the efficient separationperformance. By analyzing the velocity, we got some conclusions. The inner vortical axialvelocity of the large cone is increasing when the small conical length extend. But the innervortical axial velocity of the small cone is reducing. None of the conical outer vortical axialand inner&outer vortical tangent velocity is effected.Synergy for the multi-structure size separator, by studying the separation performance, todetermine its impact factor for the inlet hydraulic diameter, the overflow saliva force diameter,column length, the size of the cone length, as well as factors interaction. According to theprofessional acknowledge, as well as the preceding analysis results. For each factor, two levelswere selected, and designed orthogonal table to provide guidance on the16-group simulatingmodel creating. By using range analysis, we obtained the order of the wholly factors affect thestrength of the separation efficiency, and to identify the optimal combination. Entrancehydraulic diameter in the single factor analysis of variance obtained highly significant role,interaction, analysis of variance results of the vast majority showed significant, which showsthe co-ordination between the structural parameters do impact on the separation performance.Provide reference for the design and selection of the cyclone and post-operational parameters.By Variance Analysis Method, the result showed that the hydraulic diameter is highlysignificant role. Interaction of the variance analysis of the results vast majority of showedsignificant, Co-ordination between the structural parameters do have an impact on theseparation performance. The above results make a reference for the optimization design andalso it is important for further research.