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Sadhana

, Volume 31, Issue 5, pp 583–595 | Cite as

Analytical model for erosion behaviour of impacted fly-ash particles on coal-fired boiler components

  • S. K. Das
  • K. M. Godiwalla
  • S. P. Mehrotra
  • K. K. M. Sastry
  • P. K. Dey
Article

Abstract

Fly ash particles entrained in the flue gas from boiler furnaces in coal-fired power stations can cause serious erosive wear on steel surfaces along the flow path. Such erosion can significantly reduce the operational life of the boiler components. A mathematical model embodying the mechanisms of erosion on behaviour, has been developed to predict erosion rates of coal-fired boiler components at different temperatures. Various grades of steels used in fabrication of boiler components and published data pertaining to boiler fly ash have been used for the modelling. The model incorporates high temperature tensile properties of the target metal surface at room and elevated temperatures and has been implemented in an user-interactive in-house computer code (EROSIM-1), to predict the erosion rates of various grades of steel. Predictions have been found to be in good agreement with the published data. The model is calibrated with plant and experimental data generated from a high temperature air-jet erosion-testing facility. It is hoped that the calibrated model will be useful for erosion analysis of boiler components.

Keywords

Mathematical model erosion rate boiler components fly ash impingement tensile properties steel grades 

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References

  1. Bitter J G A 1963a A study of erosion phenomenon, Part 1.Wear 6: 5–21CrossRefGoogle Scholar
  2. Bitter J G A 1963b A study of erosion phenomenon, Part 2.Wear 6: 169–191CrossRefGoogle Scholar
  3. Deng T, Bingley M S, Bradley MSA 2004 The influence of particle rotation on the solid particle erosion rate of metals.Wear 256: 1037–1049CrossRefGoogle Scholar
  4. Fan J Cen D, Zhou K, Jin J 1990 Numerical prediction of tube row erosion by coal ash impaction.Chem. Eng. Commun. 95:75–88CrossRefGoogle Scholar
  5. Finnie I 1960 Erosion of surfaces by solid particles.Wear 142: 87–103CrossRefGoogle Scholar
  6. Gee M G, Gee R H, McNaught I 2003, Stepwise erosion as a method for determining the mechanisms of wear in gas borne particulate erosion.Wear 255: 44–55CrossRefGoogle Scholar
  7. Grant G, Tabakoff W 1975 Erosion prediction in turbomachinery resulting from environmental solid particles.J. Aircraft 12: 471–478Google Scholar
  8. Hutchings I M, Winter R E 1974 Particle erosion of ductile metals: a mechanism of material removal.Wear 27: 121–128CrossRefGoogle Scholar
  9. Jun Y D, Tabakoff W 1994 Numerical simulation of a dilute particulate flow (laminar) over tube banks.Trans. ASME: J. Fluid Eng. 116: 770–777CrossRefGoogle Scholar
  10. Kragelsky I V, Dobychin M N Komalov V S 1982Friction and wear calculation methods (New York: Pergamon)Google Scholar
  11. Lee B E, Fletcher C A J, Behnia M 1999 Computational prediction of tube erosion in coal-fired power utility boilers.J. Eng. Gas Turbines Power 121: 746–750Google Scholar
  12. Levy A V 1986 The platelet mechanism of erosion of ductile metals.Wear 180: 1–21CrossRefGoogle Scholar
  13. Meng H C, Ludema K C 1995 Wear models and predictive equations: Their form and content.Wear 181-183:443–457CrossRefGoogle Scholar
  14. Sheldon G I, Kanhere A 1972 An investigation of impingement erosion using single particles.Wear 21: 195–209CrossRefGoogle Scholar
  15. Sheldon G L, Maji J, Crowe C T 1977 Erosion of a tube by gas-particle flow.Trans. ASME: J. Eng. Mater. Technol. 99: 138–142Google Scholar
  16. Shida Y Fujikawa H 1985 Particle erosion behaviour of boiler tube materials at elevated temperature.Wear 103: 281–296CrossRefGoogle Scholar
  17. Tabor D 1951The hardness of metals (Oxford: University Press)Google Scholar
  18. Tilly G P 1969 Erosion caused by airborne particles.Wear 14: 63–79CrossRefGoogle Scholar
  19. Tu J Y, Fletcher C A J, Behnia M, Reizes J A, Owens D, Jones P 1997 Prediction of flow and erosion in power utility boilers and comparison with measurement.J. Eng. Gas Turbines Power 119: 709–716Google Scholar
  20. Winter R E Hutchings I M 1974 Solid particle erosion studies using single angular particles.Wear 29: 181–194CrossRefGoogle Scholar

Copyright information

© Printed in India 2006

Authors and Affiliations

  • S. K. Das
    • 1
  • K. M. Godiwalla
    • 1
  • S. P. Mehrotra
    • 1
  • K. K. M. Sastry
    • 1
  • P. K. Dey
    • 1
  1. 1.National Metallurgical LaboratoryJamshedpurIndia

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