No.8 The Development of the ACPFM system for Mitsubishi Gas Turbines
Stable firing of a gas turbine combustor is essential to insure reliability, availability, and to achieve maximum component life capability. Combustor instabilities can trigger high-pressure fluctuation and are generally due to sudden changes in operation condition such as fuel calorific value, fuel quality, ambient temperature, or sudden changes in operating load. To minimize the impact of such combustor instabilities, MHI developed a monitoring and protection system known as the Combustor Pressure Fluctuation Monitoring (CPFM) system. Following this, MHI developed the Advanced Combustor Pressure Fluctuation Monitoring system (ACPFM), which incorporates on-line monitoring and protection functions to automatically adjust the air bypass valve and the main and pilot fuel nozzles to maintain the appropriate fuel/air ratio based on the flame conditions. These airflow controls successfully prevent flame out, combustion oscillation, and flash back under various modes as well as unexpected disturbances in the combustion process. This ACPFM system has been tested at Mitsubishi's in-house power plant.
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