Study on the internal flow field and erosion wear characteristics of key components of drilling fluid centrifuge

Abstract:

During the solid-liquid separation of drilling fluids， solid-phase particles such as drill cuttings will cause serious wear failure and dynamic balance instability to the key components of the centrifuge， affecting the separation effect and shortening the service life. The internal flow field characteristics of the drilling fluid centrifuge are simulated based on the dense discrete phase model （DDPM） and the RNG k-ε turbulence model. The erosive wear performance of key components was predicted in combination with the Finnie erosion model. The effects of rotational speed， particle concentration， and medium viscosity on the erosion wear performance of the components were explored. The results show that the erosion is mainly concentrated on the blades of the screw conveyor near the feed cavity and at the bowl cone. The erosion rate of the centrifuge components rises as the rotational speed increases. Elevated particle concentration exacerbates the erosion of the components. While erosion on the inner wall of the bowl is reduced by an increase in medium viscosity， screw wall erosion is intensified. The research results provide valuable insights into the erosive wear characteristics of centrifuges and recommendations for optimizing the operation and maintenance of centrifuges in practical applications.