The fluid-solid coupling analysis of screw conveyor in drilling fluid centrifuge based on ANSYS

Abstract

In the centrifugal separations of drilling fluid, screw conveyor is a critical component to push and separate the sediment. The work performance and structural parameters of conveyor are immediately related to the production capability, the working life and the separating effect of the centrifuge. The existing researches always use the theoretical calculation of the approximate loads to analyze the strength of conveyor, and it cannot reflect the stress situations accurately. In order to ensure the precise mastery of the working performance, this article obtained pressure distribution under working conditions from CFX evaluation and gained equivalent stress and deformation under several load conditions by using the ANSYS Workbench platform to check the strength of conveyor. The results showed that the influence of centrifugal hydraulic pressure was less than that of centrifugal force on the strength and deformation of conveyor. Besides, the maximum equivalent stress occurred at the inside of the feed opening, while the maximum deformation occurred at the conveyor blade edge of taper extremity. Furthermore, whether considered the feed opening or not, the computing model had a great influence on the analysis results, and the simplified loads had a great influence on the deformation analysis results. The methods and results from this article can provide reference for the design and the improvement of screw conveyor.

Keywords

Drilling fluid centrifuge / Screw conveyor / Fluid-solid coupling / Equivalent stress

Acknowledgments

This research is Supported by the Major Cultivation foundation of Sichuan Education Department (13ZA0179).

References

[1] COSL, Drilling Solids Control Technical Manual, Southwest Jiaotong University Press, 2011.

[2] W. Tan, L. Qiao, E.D. Sha, L.Y. Liu, Optimal design of the accelerator disk in a two-stage piston pusher centrifuge using numerical simulation, Ind. Eng. Chem. Res. 51 (12) (2012) 4632-4642.

[3] G.R.A. Bell, D.D. Symons, J.R. Pearse, Mathematical model for solids transport power in decanter centrifuge, Chem. Eng. Sci. 107 (7) (2014) 114-122.

[4] G.R. Zhu, W. Tan, Y. Yu, L.Y. Liu, Experimental and numerical study of the solid concentration distribution in a horizontal screw decanter centrifuge, Ind. Eng. Res. 52 (48) (2013) 17249-17256.

[5] S.F. Zheng, X. Ren, L.J. Xie, Numerical simulation of flow field in decanter centrifuge, Light Ind. Mach. 27 (6) (2009) 26-29.

[6] P. Yu, W. Lin, X.L. Wang, et al., Velocity simulation analysis on centrifugal separation field of horizontal spiral centrifuge, J. Mech. Eng. 47 (24) (2011) 151-157.

[7] J.G. Liu, Numerical Simulation and Drum Angle Research on Flow Field of Centrifuges, Jilin University, 2011.

[8] S.C. Fu, L.D. Dong, H.X. Yuan, Numerical simulation and analysis on flow field in a decanter centrifuge based on the Euler model, Chem. Ind. Eng. Pro. 33 (1) (2014) 36-42.

[9] L.D. Dong, S.C. Fu, H.X. Yuan, Numerical simulation on pressure field in a decanter centrifuge, Chem. Ind. Eng. Pro. 33 (2) (2014) 309-313, 336.

[10] A.J. Liu, C.M. Fu, Static finite element screw conveyor to a horizontal centrifuge analysis, J. Des. Res. 34 (3) (2007) 26-28.

[11] Y. Tao, Z.J. Ai, J.P. Wang, et al., 3D finite element analysis of drilling fluid centrifuge conveyor, Oil Field Equip. 37 (11) (2008) 69-72.

[12] L.Q. Wang, T. Chen, D.Z. Wu, et al., Structural strength parameterized analysis of horizontal decanter centrifuge conveyor, J. Mach. Des. 27 (5) (2010) 67-70.

[13] Z. Yang, W.J. Huang, Z.H. Gao, et al., Finite element analysis of horizontal decanter centrifuge screw with large length-diameter ratio, J. Filtr. Sep. 04 (2011) 13-19.

[14] J. Yang, S. Preidikman, E. Balaras, A strongly coupled, embedded-boundary method for fluid-structure interactions of elastically mounted rigid bodies, J. Field Struct. 24 (2) (2008) 167-182.

[15] Y.Y. Jiang, I.S.R. Yoshimura, et al., Quantitative evaluation of flowinduced structural vibration and noise in turbo machinery by fullscale weakly coupled simulation, J. Field Struct. 23 (4) (2007) 531-544.

[16] ANSYS Inc, ANSYS CFX, Release 12.0, ANSYS Inc, USA, 2009.

[17] X.G. Song, L. Cai, H. Zhang, et al., ANSYS Fluid-structure Coupling Simulation and Engineering Design, China Water Conservancy and Hydropower Press, 2012.

[18] Q.C. Sun, D.W. Jin, Centrifuge Principle Structure and Design Calculations, Machinery Industry Press, 1987.