Multi-Objective Optimization Design Of The High-Pressure Cyclone With Guide Vanes

Guide vane high-pressure cyclone is a kind of high-pressure cyclone with guide vanes.As a very important type of gas-solid separation equipment,it is widely used in natural gas purification process,so its separation performance is directly related to the economy and safety of natural gas.As China's requirements of energy conservation and emission reduction increase,the higher performance is required for the guide vane high-pressure cyclone used for natural gas purification.Especially in shale gas production,it is necessary to develop a high-pressure cyclone with more compact structure,enhanced flow field stability and improved shale gas pressure attenuation.The existing guide vane cyclone still has problems of high pressure loss,low separation efficiency,internal scaling,wear and corrosion of the cyclone for the purification of high-pressure shale gas.so how to reduce pressure loss and cut diameter on the basis of ensuring the overall separation efficiency is the key technical issues to be solved urgently in the development of compact guide vane high-pressure cyclone.This paper combined with the guide vane high-pressure cyclone used in shale gas purification process,carried out the multi-objective optimization design of its flow channel,aiming to explore the efficient and reliable optimized design method guide vane high-pressure cyclone,and provide technical reference for the subsequent development of high-efficiency and low-resistance cyclone products.The main research contents and conclusions are as follows:(1)The relationship between the geometry parameters of the guide vane high-pressure cyclone flow channel and the separation performance was studied,and the initial flow channel of the guide vane high-pressure cyclone was designed to meet the operating conditions and separation performance requirements by summarizing approximate theoretical design method.(2)Taking the initial flow channel as the optimization object,explored the parametric method of the shape control of the guide vane which can realize the automatic iteration in the multi-objective optimization design process,modeled the guide vanes parametrically and provided the calculation model for the automatic optimization design.(3)The calculation method based on gas-solid two phase numerical simulation and separation performance prediction was studied by analyzing the principle of gas-solid separation of guide vane high-pressure cyclone.This method was used to predict the internal flow field and grade separation efficiency of the guide vane cyclone with experimental basis,which proved that method is completely feasible for the qualitative analysis of the internal flow field of the guide vane high-pressure cyclone.(4)According to the numerous design variables for the optimization of the guide vane high-pressure cyclone flow channel,the significant design variables that affect the performance targets were screened by combining with numerical simulation calculation and design of experiment method.Under the condition of satisfying the constraints,a multi-design variable and multi-objective performance optimization model of the guide vane high-pressure cyclone was constructed,which was optimized by using the response surface optimization method.(5)Based on the performance prediction method of gas-solid two-phase flow numerical simulation calculation,the separation performance,flow field characteristics and particle movement laws of the guide vane high-pressure cyclone before and after the design optimization were predicted.The comparative analysis shows that the separation performance is improved after optimization.Through the optimization of the flow channel,the distribution of internal strong rotating flow field is improved,the pressure loss is reduced,the entrainment of particle back mixing is weakened,and the cut diameter is reduced.This proves that the feasibility of multi-objective optimization design method of guide vane high pressure cyclone,and it can comprehensively predict and optimize the performance of the designed cyclone.