Advances in Computational Design

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Optimization analysis on collection efficiency of vacuum cleaner based on two-fluid and CFD-DEM model

  • Wang, Lian (School of Civil Engineering, Wuhan University) ;
  • Chu, Xihua (School of Civil Engineering, Wuhan University)
  • Received : 2019.05.05
  • Accepted : 2019.06.03
  • Published : 2020.07.25
⟨ Previous Next ⟩

Abstract

The reasonable layout of vacuum cleaner can effectively improve the collection efficiency of iron filings generated in the process of steel production. Therefore, in this study, the CFD-DEM coupling model and two-fluid model are used to calculate the iron filings collection efficiency of vacuum cleaner with different inclination/cross-sectional area, pressure drop and inlet angle. The results are as follows: The CFD-DEM coupling method can truly reflect the motion mode of iron filings in pneumatic conveying. Considering the instability and the decline of the growth rate of iron filings collection efficiency caused by high pressure drop, the layout of 75° inclination is suggested, and the optimal pressure drop is 100Pa. The optimal simulation results based on two-fluid model show that when the inlet angle and pressure drop are in the range of 45°~65° and 70Pa~100Pa, larger mass flow rate of iron filings can be obtained. It is hoped that the simulation results can offer some suggestion to the layout of vacuum cleaner in the rolling mill.

Keywords

Acknowledgement

The authors are pleased to acknowledge the support by the National Natural Science Foundation of China [grant numbers: 11472196, 11172216 and 11772237].

References

  1. Almohammed, N., Alobaid, F., Breuer, M. and Epple, B. (2014), "A comparative study on the influence of the gas flow rate on the hydrodynamics of a gas-solid spouted fluidized bed using Euler-Euler and Euler-Lagrange/DEM models", Powder Technol., 264, 343-364. https://doi.org/10.1016/j.powtec.2014.05.024.
  2. Alobaid, F. and Epple, B. (2013), "Improvement, validation and application of CFD/DEM model to dense gas-solid flow in a fluidized bed", Particuology, 11(5), 514-526. https://doi.org/10.1016/j.partic.2012.05.008.
  3. Chu, K.W., Wang, B., Yu, A.B. and Vince, A. (2009), "CFD-DEM modelling of multiphase flow in dense medium cyclones", Powder Technol., 193(3), 235-247. https://doi.org/10.1016/j.powtec.2009.03.015
  4. Crowe, C., Sommerfeld, M. and Tsuji, Y. (1998), Multiphase Flows with Droplets and Particles, CRC Press, Boca Raton, Florida, USA.
  5. Cundall, P.A. and Strack, O.D.L. (1979), "A discrete numerical model for granular assemblies", Geotechnique, 29(1), 47-65. https://doi.org/10.1680/geot.1979.29.1.47.
  6. DesignXplorer ANSYS (2013), Workbench DesignXplorer Theory User's Manual, Release 15.0.
  7. Dhurandhar, R., Sarkar, J.P. and Das, B. (2019). "Elucidation of hydrodynamics and heat transfer characteristic of converging and equivalent uniform riser for dilute phase gas-solid flow", Chem. Eng. Res. Design, 151, 120-130. https://doi.org/10.1016/j.cherd.2019.09.002.
  8. Du, W., Bao, X., Xu, J. and Wei, W. (2006), "Computational fluid dynamics (CFD) modeling of spouted bed: assessment of drag coefficient correlations", Chemical Eng. Sci., 61(5), 1401-1420. https://doi.org/10.1016/j.ces.2005.08.013.
  9. Du, W., Bao, X., Xu, J. and Wei, W. (2006), "Computational fluid dynamics (CFD) modeling of spouted bed: influence of frictional stress, maximum packing limit and coefficient of restitution of particles", Chem. Eng. Sci., 61(14), 4558-4570. https://doi.org/10.1016/j.ces.2006.02.028.
  10. Feng, Y.T. and Owen, D.R.J. (2014), "Discrete element modelling of large scale particle systems-I: exact scaling laws", Comput. Particle Mech., 1(2), 159-168. https://doi.org/10.1007/s40571-014-0010-y
  11. Gidaspow, D. (1994), Multiphase Flow and Fluidization: Continuum and Kinetic Theory Description, Academic Press, San Diego, USA.
  12. Hobbs, A. (2009), "Simulation of an aggregate dryer using coupled CFD and DEM methods", J. Comput. Fluid Dynam., 23(2), 199-207. https://doi.org/10.1080/10618560802680971
  13. Hoomans, B.P.B., Kuipers, J.A.M., Briels, W.J. and Van Swaaij, W.P.M. (1996), "Discrete particle simulation of bubble and slug formation in a two-dimensional gas-fluidised bed: A hard-sphere approach", Chem. Eng. Sci., 51(1), 99-118. https://doi.org/10.1016/0009-2509(95)00271-5.
  14. Liu, H.X., Liu, M., Jiao, L., Zhao, L., Luo, J., Xu, D. and Guo, Y. (2018), "Numerical simulation of gas-solid two-phase flow in electrostatic precipitator of 1000MW unit", Chinese J. Environ. Eng., 12(7), 2029-2038. (In Chinese).
  15. Ma, J., Wang, C.B., Ren, Y.J. and Hu, J. (2019), "Numerical Simulation and Optimization Design of Gas-solid Two-phase Flow in Flexible Membrane High Temperature Dust Filter", J. North China Electric Power University, 46(1), 95-102. (In Chinese)
  16. Mathiesen, V., Solberg, T. and Hjertager, B.H. (2000), "Predictions of gas/particle flow with an Eulerian model including a realistic particle size distribution", Powder Technol., 112(1-2), 34-45. https://doi.org/10.1016/S0032-5910 (99)00303-4.
  17. Miao, Z., Kuang, S.B., Zughbi, H. and Yu, A.B. (2019), "CFD simulation of dilute-phase pneumatic conveying of powders", Powder Technol., 349, 70-83. https://doi.org/10.1016/j.powtec.2019.03.031
  18. Patro, P. and Dash, S.K., (2014), "Numerical Simulation for Hydrodynamic Analysis and Pressure Drop Prediction in Horizontal Gas-Solid Flows", Particulate Sci. Technol., 32(1), 94-103. https://doi.org/10.1080/02726351.2013.829543.
  19. Patro, P. and Dash, S.K., (2014), "Two-fluid modeling of turbulent particle-gas suspensions in vertical pipes", Powder Technol., 264, 320-331. https://doi.org/10.1016/j.powtec.2014.05.048.
  20. Ray, M., Chowdhury, F., Sowinski, A., Mehrani, P. and Passalacqua, A. (2019), "An Euler-Euler model for mono-dispersed gas-particle flows incorporating electrostatic charging due to particle-wall and particle-particle collisions", Chem. Eng. Sci., 197, 327-344. https://doi.org/10.1016/j.ces.2018.12.028.
  21. Xu, B.H. and Yu, A.B. (1997), "Numerical simulation of the gas-solid flow in a fluidized bed by combining discrete particle method with computational fluid dynamics", Chem. Eng. Sci., 52(16), 2785-2809. https://doi.org/10.1016/S0009-2509(97)00081-X.
  22. Xu, S.L., Sun, R., Cai, Y. Q. and Sun, H.L. (2018), "Study of sedimentation of non-cohesive particles via CFD-DEM simulations", Granular Matter, 20(1), 4. https://doi.org/10.1007/s10035-017-0769-7.
  23. Yu, A.B. and Xu, B.H. (2003), "Particle-scale modelling of gas-solid flow in fluidization", J. Chem. Technol. Biotechnol., 78(2-3), 111-121. https://doi.org/10.1002/jctb.788.
  24. Zhang, H., Li, T., Huang, Z., Kuang, S. and Yu, A. (2018), "Investigation on vertical plug formation of coarse particles in a non-mechanical feeder by CFD-DEM coupling method", Powder Technol., 332, 79-89. https://doi.org/10.1016/j.powtec.2018.03.055.
  25. Zhou, Z.Y., Kuang, S.B., Chu, K.W. and Yu, A.B. (2010), "Discrete particle simulation of particle-fluid flow: model formulations and their applicability", J. Fluid Mech., 661, 482-510. https://doi.org/10.1017/S002211201000306X.
  26. Zhu, H.P., Zhou, Z.Y., Yang, R.Y. and Yu, A.B. (2007), "Discrete particle simulation of particulate systems: theoretical developments", Chem. Eng. Sci., 62(13), 3378-3396. https://doi.org/10.1016/j.ces.2006.12.089.