TM 5-815-1/AFR 19-6
air operation and flue-gas recirculation must
design must accompany any application of
be implemented simultaneously from a design
flue-gas recirculation which effectively lowers
point of view. LEA operation may require
furnace temperature and thus, radiative heat
installation or retrofitting of air registers to
transfer. Convective heat transfer is also
maintain proper combustion air speed and
increased by increased gas flow due to the
mixing at reduced levels or air flow. Flue gas
dilution of combustion air. It is advisable to
recirculation will require larger air registers to
consult boiler manufacturers as to the
accommodate the increased volume of flow.
applicability of flue-gas recirculation to their
Therefore, simultaneous application of LEA
furnaces.
e. Summary. The potential and applicability of each
operation and flue-gas recirculation may
minimize the need for redesign of burner air
NOx reduction technique is summarized in table 11-4.
registers. Knowledge of furnace thermal
11-6
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