Power plant air flow applications: Secondary Air Flow: Controlled to maintain the desired stoichiometric fuel/air rations. Very important to overall boiler efficiency and NOx reduction.        Primary Air Flow to Coal Mills: Should be monitored and controlled to improve coal mill efficiency.        Overfire Air Flows: Added to many boilers to reduce NOx emissions. Each OFA Zone must have independent control.        Flue Gas Recirculation Flow (FGR): Mixes with secondary combustion air and reduces NOx emissions.        Air Flow to Individual Burners: To improve combustion efficiency and reduce NOx emissions.        Flue Gas Flows: For Ammonia injection control in SCR units.

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