Feedforward selective catalytic reduction system for turbine engines

A selective catalytic reduction system for treating an exhaust flow including nitrogen oxides in a turbine engine comprising:

• a turbine engine having an exhaust section fluidly connected to receive an exhaust flow from a turbine section of the engine;
• a selective catalytic reduction system having an injector and a catalyst, the catalyst being disposed in the exhaust flow and downstream of the injector relative to the direction of exhaust flow;
• a reducing agent supply source in fluid communication with the injector by a fluid conduit;
• a flow control valve disposed along the fluid conduit;
• and
• an electronic control circuit operatively connected to flow control valve, the electronic control circuit comprising instructions which;
• determine the difference between a measured molar flow of nitrogen oxides in the exhaust flow and a predicted molar slow of nitrogen oxides in the exhaust flow to yield an error factor;
• apply the error factor to the predicted molar flow of nitrogen oxides in the exhaust flow so that the predicted molar flow equals the measured molar flow
• during steady state operation of the turbine engine, direct the flow control valve to supply a reducing agent to the injector in an amount based on the measured molar flow of nitrogen oxides in the exhaust flow,
• during a disturbance in the operation of the turbine engine, direct the flow control valve to supply a reducing agent to the injector in an amount based on the predicted molar flow of nitrogen oxides with the applied error factor in the exhaust flow.