An incinerator system that provides flue gas recirculation and selective noncatalytic reduction (SNCR) for reducing NOx and CO emissions, the incinerator system comprising:
- a primary combustion chamber configured to:
- receive waste materials from a loader;
- receive an amount of above-fire combustion air and an amount of under-fire combustion air;
- and
- produce partially combusted waste materials and post-combustion flue gas;
- a secondary combustion chamber configured to:
- receive the partially combusted waste materials and post-combustion flue gas from the primary combustion chamber;
- produce substantially combusted waste materials and an amount of oxidized flue gas;
- wherein the delivered SNCR reagent initiates an SNCR process that reduces NOx in the oxidized flue gas;
- a flue gas recirculation system downstream of the secondary combustion chamber and configured to:
- receive the substantially combusted waste materials and oxidized flue gas from the secondary combustion chamber;
- and
- produce and deliver (a) above-fire flue gas recirculation gas and (b) under-fire gas recirculation gas to the primary combustion chamber to reduce a temperature in the primary combustion chamber to provide a first NOX reduction in the flue gas;
- an SNCR system configured to deliver a controlled amount of SNCR reagent to the secondary combustion chamber to provide a second NOX reduction in the flue gas;
- a sensor system configured to measure a plurality of incinerator parameters, including at least one temperature sensor associated with the primary combustion chamber;
- and
- a programmable logic controller configured to:
- control the above-fire and under-fire gas recirculation gasses delivered to the primary combustion chamber, including:
- receiving temperature sensor signals from the at least one temperature sensor indicating a measured temperature in the primary combustion chamber;
- comparing the measured temperature in the primary combustion chamber with at least one set point temperature;
- and
- based at least on the comparison of the measured temperature in the primary combustion chamber with the at least one set point temperature:
- dynamically controlling one or more dampers of the flue gas recirculation system to control the above-fire and under-fire gas recirculation gasses delivered to the primary combustion chamber:
- control the amount of above-fire combustion air and the amount of under-fire combustion air delivered to the primary combustion chamber based on sensor signals received from the sensor system;
- and
- control at least one injection nozzle to adjust an angle of injection of the SNCR reagent into the secondary combustion chamber.