Steam turbine start-up can be a significant contributor to overall combined-cycle start time and variability due to complex processes with multiple operator touch points and conservative operating limits. OpFlex is an integrated, plant-level control approach. This level of automation provides enhanced combined cycle start times, reduced variability, and reduced fuel consumption.
Steam Turbine AGILITY is a comprehensive system solution to improve start times of combined-cycle plants. It includes a combination of controls upgrades with expert plant-level operational analysis and recommendations to deliver significant improvements in combined-cycle start performance.
Improved startup reliability—reduced potential for missing generation during peak periods.
Less fuel consumption during each startup. Up to $9,000 in fuel savings per start.
Faster hot, warm, and cold start times. Up to 57% start time reduction.
Reduced NOx 10% to 35% and CO avoided annually.
Limited start time variation. More predictable and repeatable combined-cycle start times.
The STHCS uses heated air to keep the high-temperature rotors warm during periods of standstill and prior to re-start. This solution reduces start-up times by eliminating cold start conditions as well as providing preservation of the steam turbine and condenser by maintaining humidity control when the unit is in stand-still mode.
Implementing the ST heat conservation system will prevent the steam turbine from entering a cold condition after the shutdown. The warm-keeping of the ST leads to the following benefits: