1. Consider that you have a boiler that burns natural gas. The boiler (boiler) is tangential type and has an emission control system based on flue gas recirculation. If your plant burns 2.0 m3std/min of natural gas, estimate the annual NOx emissions from this operation (kg/year). The NOX emission factor is 76 lb/10^6 scf.

For tangential-fired boilers with SNCR control, apply a 13 percent reduction to the appropriate NOX emission factor.