Abstract
This paper reports experimental measurements of the time-resolved particle temperature fluctuations in an 80 MWc utility boiler. Results are presented in terms of mean and RMS temperature fluctuations, as well as power spectra and probability density functions of temperature. Results show significant variations in mean and RMS temperature with elevation in the boiler; RMS temperature fluctuations are high in the burner planes, decay to low levels just below the boiler nose, then increase again as the combustion products proceed over the nose toward the convective pass. Power spectra of the temperature fluctuations reveal significantly stronger high frequency content in the burner plane than at higher elevations. Preferred frequencies were observed downstream of the superheater pendants, and are believed to be due to vortex shedding from the pendant tubes. Probability density functions reveal that the turbulent fluctuations in particle temperature are not Gaussian in the flame zone, but exhibit very nearly normal distributions after complete burnout.
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