Abstract: Aiming at the problem of flameout rotating speed rising of 9E gas turbine, the shutdown history data of the gas turbine were analyzed. The shutdown procedure and the characteristic parameters of the function modules of Mark V control system were studied. By online test and dynamic modification repeatedly, the parameters matched with the current status of the gas turbine were found out finally, and the gas turbine can be stopped at normal flameout rotating speed. Due to the solving of this problem, the reliability of the Mark V control system for the gas turbine was improved and the safe and stable operation of the unit was ensured.

Key words: 9E gas turbine, flameout rotating speed, rise, Mark V control system, shutdown, optimization