System and method for a gas turbine engine

A method, comprising:

• combusting an oxidant and a fuel in a gas turbine engine to generate an exhaust gas;
• treating a portion of the exhaust gas from the gas turbine engine in a catalyst bed to generate a treated exhaust gas;
• monitoring a first differential temperature between a first temperature of the portion of the exhaust gas upstream of the catalyst bed and a second temperature of the treated exhaust gas downstream of the catalyst bed using a first differential temperature monitor;
• adjusting a parameter to maintain an efficacy of the catalyst bed based at least in part on the first differential temperature in order to maintain a target equivalence ratio using an oxidant-to-fuel ratio system;
• injecting a catalyst bed oxidant upstream of the catalyst bed using an oxidant injection system, or injecting an oxidation fuel upstream of the catalyst bed using an oxidation fuel injection system, or any combination thereof;
• monitoring a localized differential temperature between an inlet temperature of the exhaust gas and a localized outlet temperature of the treated exhaust gas downstream of an injection point of the catalyst bed oxidant, the oxidation fuel, or any combination thereof, using a localized differential temperature monitor;
• and
• adjusting at least one of an oxidant flow rate of the oxidant, or a fuel flow rate of the fuel, or any combination thereof, based at least in part on a comparison of the localized differential temperature with the first differential temperature.

A system, comprising:

• a controller, comprising:
• one or more tangible, non-transitory, machine-readable media collectively storing one or more sets of instructions;
• and
• one or more processing devices configured to execute the one or more sets of instructions to:
• combust an oxidant and a fuel in a gas turbine engine to generate an exhaust gas;
• treat a portion of the exhaust gas from the gas turbine engine in a catalyst bed to generate a treated exhaust gas;
• monitor a first differential temperature between an inlet temperature of the exhaust gas upstream of the catalyst bed and an outlet temperature of the treated exhaust gas downstream of the catalyst bed using a first differential temperature monitor;
• transmit a first differential temperature signal from the first differential temperature monitor to a control system;
• adjust a parameter to maintain an efficacy of the catalyst bed based at least in part on the first differential temperature in order to maintain a target equivalence ratio;
• monitor a localized differential temperature between a first temperature of the portion of exhaust gas and a localized outlet temperature of the treated exhaust gas downstream of an injection point, wherein the injection point is configured to inject a catalyst bed oxidant, or an oxidation fuel, or any combination thereof, upstream of the catalyst bed;
• and
• adjust at least one of an oxidant flow rate of the oxidant, or a fuel flow rate of the fuel, or any combination thereof, based at least in part on a comparison of the localized differential temperature with the first differential temperature.