System and method of improving emission performance of a gas turbine

A power generation system comprising:

• a gas turbine system comprising:
• a combustion chamber configured to combust a fuel stream;
• a compressor configured to receive a feed oxidant stream and supply a compressed oxidant stream to the combustion chamber;
• and
• an expander configured to receive a discharge stream from the combustion chamber and generate an exhaust stream comprising carbon dioxide and electrical energy;
• and
• an exhaust gas recirculation system comprising:
• a splitter configured to split the exhaust stream into a first split stream and a second split stream;
• a heat recovery steam generator configured to receive the first split stream and generate a cooled first split stream, wherein a portion of the cooled first split stream is mixed with the second split stream to generate a recycle stream, and wherein the recycle stream is mixed with the fresh oxidant to generate the feed oxidant stream;
• and
• an exhaust gas recirculation control loop configured to receive feedback related to at least one of a load pressure, a percentage of exhaust gas recirculation, emissions of NOx and CO2 at an exit of the combustor and a firing temperature in the combustion chamber to control a pilot ratio of the feed oxidant stream.

A method of generating power with reduced NOx emission comprising:

• compressing a feed oxidant and generating a compressed oxidant stream in a compressor;
• combusting a fuel stream and the compressed oxidant stream in a combustion chamber and generating a discharge stream;
• expanding the discharge stream from the combustion chamber and generating an exhaust stream comprising carbon dioxide and electrical energy;
• recovering heat from the exhaust stream and generating a recycle stream;
• mixing the recycle stream with a fresh oxidant and generating the feed oxidant stream;
• and
• controlling a pilot ratio based on feedback regarding a plurality of combustor parameters received by a model based control of an exhaust gas recirculation control loop.