Study On The Separation Effect Of Cuttings In Hydrocyclone Drilling

Hydrocyclones are commonly used for solid-liquid separation in industry.It has the advantages of simple structure,convenient operation,no need of components and application economy.Because its internal complex three-dimensional strong rotation of the flow field,it is difficult to be accurately described.Although a variety of theoretical model have been established,in the industry is still using the empirical model for design and application.In the practicable application process,even if the structure of the hydrocyclone is optimized,the change of the operating parameters and the material parameters will lead to the deterioration of the hydrocyclone.In order to ensure that the separation performance of the hydrocyclone is kept within a good range during the course of use,the relationship between the operating parameters,the material parameters and the performance parameters are discussed.The main purpose of this thesis is to use the FXJ-100 hydrocyclone,which is commonly used in desilter,to explore the intrinsic relationship between operating parameters,material parameters and performance parameters.The relevant knowledge of centrifugal pumps is used to adjust the centrifugal pump associated with the hydrocyclone operation performance.The purpose of the above operation is to maintain better separation efficiency of the hydrocyclone when the material parameters change.Firstly,according to the characteristics of the internal flow field of the hydrocyclone,the appropriate numerical calculation model is selected.In engineering applications,the mud in solid control system is mostly non-Newtonian fluid,while the mud is composed of drilling fluid and drilling cuttings.Therefore,according to the existing research results on drilling mud and rheology of drilling fluid,the Herschel-Bulkey model is used to describe the constitutive equation of non-Newtonian fluid.The MIXTURE and RSM models are used to simulate the existing hsieh's experiments.The simulation results are compared with the experimental results to ensure the reliability of the numerical model.Secondly,the numerical orthogonal test is designed to explore the material parameters and the relationship between the operating parameters.The variance analysis of the numerical orthogonal test results was carried out and the single factor and interaction were found for the performance parameters of the hydrocyclone.According to the significant influencing factors of orthogonal test,the inlet pressure drop,amount of water split to underflow,cut size and the classification efficiency curve in the hydrocyclone performance parameters are analyzed respectively.Determine the range of variation of the parameters for the following system to provide the basis for regulation.Finally,in hydrocyclone applications,the equipment that provides the flow and the operating pressure is the centrifugal pump.Structure of the most optimization of the hydrocyclone in the application process,the performance parameters should be maintained in a more reasonable state.Based on the influence of the significant factors on the performance parameters,the centrifugal pump debugging relevant to the hydrocyclone operation parameters is carried out.This thesis summarizes centrifugal pump adjustment method and the improvement of the separation efficiency of the hydrocyclone after adjusting the parameters of different materials.