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Analysis of Combustion Oscillation and its Suppression in a Silo Type Gas Turbine Combustor  

Seo, Seok-Bin (Korea Electric Power Research Ins.)
Ahn, Dal-Hong (Korea Electric Power Research Ins.)
Cha, Dong-Jin (Dept. of Building Services Engineering, Hanbat University)
Park, Jong-Ho (Department of Mechanical Engineering, Chungnam University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.21, no.2, 2009 , pp. 126-130 More about this Journal
Abstract
The present study describes an investigation into the characteristics of combustion oscillation and its suppression instability of a silo type gas turbine combustor in commercial power plant. Combustion oscillation is occurred the combustor in near full load during operation. As a result of FFT analysis of the combustion dynamics, the frequency of the oscillation is analyzed as the 1'st longitudinal mode of acoustic resonance of the combustor. For suppress of the instability, combustion tuning with adjust of fuel valve schedule is carried out, which changes equivalent ratio of each burners. As the result, the oscillation is successfully reduced with meeting the level of NOx emission regulation.
Keywords
Combustion oscillation; Gas turbine; Lean premixed combustion; Combustion instability;
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