The existing 16 burners on Unit 3 were
replaced by Foster Wheeler Controlled Flow/
Split Flame LNBs. These burners employ
dual combustion-air registers, allowing control
of air distribution at the burner and providing
independent control of the ignition
zone and flame shape. The gas reburning
system retrofit involved routing natural gas
to 16 boiler penetrations (eight on the front
wall and eight on the rear wall), installing a
flue gas recirculation fan, installing a multiclone
dust collector to remove particulates
and protect the fan, and connecting the
equipment with the ductwork. The OFA
system involved installing an OFA fan and
ductwork from the secondary air system to
six front-wall injection nozzles. The control
system was also modified.