M251S型燃气轮机低频燃烧振动优化与熄火抑制OA

To address the problems of low-load combustion instability and flameout when the M251S gas turbine purely burns blast furnace gas,the flame structure and stabilization mechanism of the combustion chamber were studied.Relying on the combustion pressure fluctuation monitoring system for real-time diagnosis of combustion status,combustion adjustment tests were designed and carried out,with emphasis on analyzing the coupling effect of the combustion chamber bypass valve opening on vibrations in various frequency bands.By optimizing the bypass valve control curve over the full load range,the maximum low-frequency vibration of the unit was reduced from 1.86 kPa to 0.79 kPa,and its normal distribution characteristics were significantly improved,effectively solving the problem of low-load flameout and thus enhancing the operational reliability of the unit.