• Milić D Erić, Laboratory for Thermal Engineering and Energy, Vinča Institute of Nuclear Sciences, Serbia
  • Dejan B Cvetinović, Laboratory for Thermal Engineering and Energy, Vinča Institute of Nuclear Sciences, Serbia
  • Zoran Pavlović, Laboratory for Thermal Engineering and Energy, Vinča Institute of Nuclear Sciences, Serbia
  • Slobodan Đekić, PC Electric Power Industry of Serbia, Serbia
  • Predrag Lj Stefanović, Laboratory for Thermal Engineering and Energy, Vinča Institute of Nuclear Sciences, Serbia
  • Predrag M Radovanović, Faculty of Mechanical Engineering, University of Belgrade, Serbia

Investigation on pulsatile combustion in utility boilers pulverized coal

  • Results of complex investigation of pressure oscillations at TPP 'Ptolemais' Ptolemais, Greece - Unit 2 are presented at this paper. Intensive and frequent pressure pulsations, in the boiler tract with significant flame instability, which resulted in lower steam production, followed by constant liquid fuel fire support. In order to solve the problem a complex measurements and investigation have been provided, aiming to determine the cause of increased pressure oscillations in the boiler tract. Measuring system for pulsations characterization is based on piezoelectric sensors with operating range of ±5 kPa connected to the high speed acquisition system. Data acquisition has been provided with frequency of 1 kHz for the most regimes presented in this paper. For the analysis of pressure oscillations and for determining oscillation origin, intensity and frequency of pulsations a several time and frequency domain analysis were used. Analyses showed the time delay between signals from sensors which were located in different measuring points along the boiler tract. The results of investigations explicitly indicated the origin of perturbation in the pulverized coal combustion process. By applying suitable measures in the firing systems the problem was solved, and the unit reached a nominal power and parameters close to designed during stable and long-lasting operation.
  • Keywords
    pulsatile combustion, pulverized coal, utility boiler, pressure pulsations, time and frequency domain analyses
  • Pages
    69 - 81
  • UDC
    662.62:53.082.73
  • BIBLID
    0350-218X, 34 (2008), 1, 69-81
  • References
    • Erić, M. (2008) Prilog otklanjanju pulzativnog sagorevanja u energetskim kotlovima. Beograd: Mašinski fakultet, Magistarski rad
    • Meier, W., Weigand, P., Duan, N.R., Giezendanner-Thoben, R. (2007) Detailed characterization of the dynamics of thermoacoustic pulsations in a lean premixed swirl flame. Combustion and flame, 150, 1-2, 2-26
    • Radovanović, P., i dr. (2002) Thermal tests of 125 MWe boiler unit #2 at TPP Ptolemais, Greece (with investigation on lignite pulsatile combustion). Belgrade: Vinča, Final report
    • Smith, S. (1997) Digital signal processing. San Diego, California, USA: Technical publishing
    • Yu, K.H., Trouve, A., Daily, J.W. (1991) Low-frequency pressure oscillations in a model ramjet combustor. Journal of fluid mechanics, 232, 47-72
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