Patent ID: 8443739

Claim:
A waste combustion system for reducing NOx emission, the system comprising: a furnace, said furnace comprising a grate supporting a combusting waste bed, a primary air source introducing primary air upstream from the grate, at least one secondary nozzle introducing secondary air downstream from the combusting waste bed, and at least one tertiary nozzle introducing tertiary air, the at least one tertiary nozzle located at a distance downstream from said at least one secondary nozzle; a continuous emissions monitoring system configured to monitor NOx emissions from the furnace; a controller configured to receive measurements from the continuous emissions monitoring system and to dynamically adjust the allocation of the secondary air and the tertiary air in response to said measurements so as to reduce the NOx emissions from the furnace, while simultaneously minimizing thermal degradation of a wall of the furnace, wherein the secondary air enters the furnace system at a velocity such that it causes only negligible mixing in the furnace; a selective non-catalytic reduction (SNCR) system, the SNCR system comprising at least one SNCR nozzle configured to inject a reagent into the furnace, said at least one SNCR nozzle positioned downstream from the at least one tertiary air nozzle; wherein the at least one SNCR nozzle is located within a turbulence zone generated by the at least one tertiary air nozzle to improve the mixing and reaction effectiveness of the reagent introduced by the SNCR system; and wherein the controller is further configured to dynamically adjust the allocation of the secondary air and the tertiary air so as to improve effectiveness of the reagent introduced by the SNCR system.