Research On The Structure Design And Performance Of Axial Flow Guide Vane Hydrocyclone

In recent years,offshore oilfield development is at a stage of vigorous development,and the sewage treatment volume of offshore platforms has increased dramatically,which puts forward higher requirements for sewage treatment equipment.Aiming at the problems of large sewage treatment capacity,poor compactness of equipment,high energy consumption and high pressure drop of traditional tangential inlet hydrocyclone on offshore platforms and stations,the research method combining CFD numerical simulation and laboratory experiment is used to carry out the design and development of axial flow guide vane hydrocyclone in this paper.For the axial flow guide vane hydrocyclone,the guide vane structure is the core component for generating swirl.Based on the guide vane design criteria of the aerodynamic design method,the basic structure of the inlet guide vane is determined.In this paper,the CFD numerical simulation method is used to optimize the number and height of guide vanes,considering the tangential velocity of the fluid after the guide vanes,the overall pressure drop of the hydrocyclone and the oil removal effect of the hydrocyclone.Because the overflow structure of hydrocyclone has a great influence on the flow field characteristics,the numerical simulation of the internal flow field of hydrocyclone with different overflow structures is carried out in this paper.From the results of numerical simulation,with the increase of the length of the straight overflow pipe or the decrease of the cone angle of the inverted cone overflow structure,the stability of the flow field inside the swirl pipe is gradually enhanced,the length of the zero axis velocity envelope surface is increased,and the overall pressure drop of the swirl pipe is reduced.The results of laboratory experiments show that the form of the overflow structure has little effect on the separation efficiency,and the position of the overflow port really affects the separation efficiency.The phenomenon of liquid flow blocking is easy to occur in the upper part of the large cone section of the cyclone tube,which can be effectively reduced by using the inverted cone overflow structure.At the same time,the inverted cone overflow structure has more obvious effect on reducing the underflow pressure drop and overflow pressure drop of hydrocyclone.In order to fully consider the adaptability of the hydrocyclone to the existing equipment and pipelines in offshore platforms and stations,facilitate the transformation of the equipment process and facilitate the skid-mounted and integrated design,according to the design idea of multi tube combined hydrocyclone,the entrance section,underflow section and overflow section of single tube hydrocyclone were separated and designed,and the shape,area and length of the wall entrance of the hydrocyclone were optimized.The experimental results show that the combination design between the cyclone tube and the shell is reasonable and can achieve the goal of sewage treatment.In this paper,a set of laboratory experiment system is designed and built independently to test the performance of hydrocyclone with optimal overflow structure.According to the experimental results,analyze the influence of factors such as inlet flow rate,overflow ratio,oil concentration,oil droplet size and other factors on the performance of the hydrocyclone,and draw the boundary diagram of the operating parameters.According to the experimental results of performance test of single tube axial flow guide vane hydrocyclone,the pressure drop model and particle size efficiency model are established,which can provide theoretical guidance for practical engineering application.