Sequential Gas Turbine Startup for Stable Black Grid Restoration

The method applies preliminary action by pre-heating the inlet air to the second combustor using heat exchangers before ignition. This preliminary heating ensures that when fuel is introduced into the second combustor, the air temperature is already sufficient to support stable combustion, eliminating the need to wait for natural heating during operation. The inlet air is heated to a temperature between 200°C and 400°C before being supplied to the second combustor, enabling immediate stable operation upon grid connection.

The system performs preliminary heating of the inlet air to the second combustor using heat exchangers that utilize hot exhaust gases from the first combustor or turbine. This preliminary action raises the inlet air temperature to between 200°C and 400°C before fuel injection begins, ensuring that stable combustion can be achieved immediately when the second combustor is activated, without requiring extended warm-up time during grid restoration operations.

The method prepares the second combustor for immediate operation by pre-heating its inlet air through heat exchangers during the idle phase, while the gas turbine runs at nominal speed with only the first combustor active. This preliminary preparation allows for rapid transition to dual-combustor operation when grid connection is established, enabling the system to quickly maximize power export capability without complicating the idle phase operation or requiring extended warm-up periods.