Analytical model for erosion behaviour of impacted fly-ash particles on coal-fired boiler components
- 215 Downloads
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.
KeywordsMathematical model erosion rate boiler components fly ash impingement tensile properties steel grades
Unable to display preview. Download preview PDF.
- Grant G, Tabakoff W 1975 Erosion prediction in turbomachinery resulting from environmental solid particles.J. Aircraft 12: 471–478Google Scholar
- Kragelsky I V, Dobychin M N Komalov V S 1982Friction and wear calculation methods (New York: Pergamon)Google Scholar
- 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
- 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
- Tabor D 1951The hardness of metals (Oxford: University Press)Google Scholar
- 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