System and method for fuel blending and control in gas turbines

A system, comprising:

• a gas turbine engine comprising a combustor;
• and
• a fuel blending system, comprising:
• a first fuel supply configured to supply a first fuel;
• a second fuel supply configured to supply a second fuel;
• a first fuel circuit configured to blend the first fuel and the second fuel to form a first fuel mixture;
• a second fuel circuit configured to blend the first fuel and the second fuel to form a second fuel mixture;
• and
• a controller configured to regulate blending of the first fuel mixture and blending of the second fuel mixture based on a measured composition of the first fuel, wherein the controller is configured to regulate blending of the first fuel mixture and the second fuel mixture based on a threshold limit of nitrogen, carbon dioxide, hydrogen sulfide, or oxygen in the first fuel.