Exhaust gas recirculation system, turbomachine system having the exhaust gas recirculation system and exhaust gas recirculation control method

A turbomachine system comprising:

• a compressor;
• at least one combustor configured to receiving incoming fuel;
• at least one turbine operatively connected to the at least one combustor;
• and
• an exhaust gas recirculation system comprising:
• an exhaust gas recirculation regulator operatively connected to the at least one turbine, the exhaust gas recirculation regulator directing a predetermined amount of gas from the at least one turbine to the compressor,
• at least one measuring unit configured to measure fuel composition of the incoming fuel at the at least one combustor, and
• a control unit operatively connected to the exhaust gas recirculation regulator and the measuring unit, the control unit determining at least one of a Wobbe Index and reactivity of the incoming fuel based on the measured fuel composition and determining the predetermined amount of exhaust gas to be recirculated based on the at least one Wobbe index and reactivity.

An exhaust gas recirculation control method, the method comprising:

• measuring fuel composition of incoming fuel;
• determining at least one of a Wobbe Index and reactivity of the incoming fuel based on the measured fuel composition;
• determining a predetermined amount of exhaust gas to be recirculated based on the determined at least one Wobbe index and reactivity;
• controlling an exhaust gas recirculation flow rate based on the predetermined amount of exhaust gas;
• and
• recirculating the predetermined amount of exhaust gas.