Journal of Failure Analysis and Prevention

, Volume 8, Issue 4, pp 362–369 | Cite as

Optimization of Gas Nozzles Geometry in Dual-Fuel Burners of Power Stations

  • Ebrahim Moussavi Torshizi
  • Ehsan Allah Saadati
  • Ali Rafiee
Technical Article---Peer-Reviewed


Thermal power required by boilers in steam power stations is supplied through gas or heavy oil fueled burners. Incorrect functioning of these burners results, on one hand, in their inability to supply the utility’s needed steam and, on the other hand, in imposing damages to various parts of the boiler and burner’s structure itself. The present paper investigates problems related to the burners used in the boilers of Shazand 325 MW power station in Arak. Gas-fueled nozzles of these boilers had suffered burns, so that a large number of them would have to be either repaired or replaced in every six-monthly maintenance cycle. These difficulties are caused partly by design errors and partly by incorrect commissioning of these burners. In this paper, the burners’ faults are investigated from the following viewpoints: (1) Statistical assessment of failures. (2) Investigation of trend in the nozzles failure and microstructure changes during operations. (3) Calculation of nozzles temperature when using heavy oil and natural gas fuels. Investigations leading to solutions providing new designs for nozzles in this paper and later evaluation of temperature of the new nozzles in various conditions using natural gas and heavy oil fuels have been carried out.


Boiler Furnace Burner breakdown/failure Combustion CFD 



It is considered necessary to thank all managers, workers, and colleagues of Shazand power station, especially Mr. Mashayekhi, MD, of the station, as well as engineers at the Research and Standards Office of the West Electricity Board.

Selected References

  1. Combustion Engineering, an Introduction to Combustion, McGraw-Hill (2000).Google Scholar
  2. E. Moussavi Torshizi et al., “Investigation of Nozzles Failure Causes of Gas Turbine Power Station of Qom,” Technical Report, Power and Water University of Technology (PWUT) (2000).Google Scholar
  3. E. Moussavi Torshizi et al., “Investigation of Nozzles Failure Causes of Shazand Thermal Power Station,” Technical Report, Power and Water University of Technology (PWUT) (2005).Google Scholar
  4. E. Moussavi Torshizi et al., “A Study on Air Adjustment in Power Plant’s Burners,” WSEAS Conf., Greece (2006).Google Scholar
  5. A.F. Najafi et al., “Investigation on swirl effects on the shape and temperature distribution in a non industrial premixed burner,” PSC Conf., Iran.Google Scholar
  6. Shazand Power Plant Technical Documents.Google Scholar
  7. J. Warnatz, R.W. Dibble, and U. Maas, Combustion, 3rd ed., Springer-Verlag (2001).Google Scholar

Copyright information

© ASM International 2008

Authors and Affiliations

  • Ebrahim Moussavi Torshizi
    • 1
    • 2
  • Ehsan Allah Saadati
    • 1
  • Ali Rafiee
    • 1
  1. 1.Department of Mechanical EngineeringPower and Water University of Technology (PWUT)TehranIran
  2. 2.Niroo Research Institute (NRI)TehranIran

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