Abstract
The primary methods of reducing nitrogen oxides, despite the development of more advanced technologies,
will continue to be the basis for NOx reduction. This paper presents the results of multivariate
numerical studies on the impact of air staging on the flue gas temperature and composition, as well
as on NOx emissions in a OP 230 boiler furnace. A numerical model of the furnace and the platen
superheater was validated based on measurements using a 0-dimensional model of the boiler. Numerical
simulations were performed using the ANSYS Workbench package. It is shown that changes in
the distribution of air to OFA nozzles, the angle of the air outflow from the nozzles and the nozzle
location involve a change in the flue gas temperature and in the volume of NOx and CO emissions at
the furnace outlet.
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