A new
deep-air-staging and low-NO
x
technology
has been introduced to a 300 MWe anthracite- and down-fired
boiler with swirl burners. Industrial experiments were performed at
different outer secondary air vane angles (defined as β) (i.e.,
20°, 30°, 40°, and 50°) to evaluate the environmental
and economic performance for the retrofitted boiler. Furthermore,
combining with the previous investigations on the inner secondary
air vane angle (defined as α), the influence degrees of β
and α on anthracite combustion and NO
x
emissions for the retrofitted boiler were further analyzed
and compared. The experimental results revealed that the main factors
affecting the ignition and the flame fullness for β and α
are different. Compared with α, β had a relatively greater
influence on NO
x
emissions for the retrofitted
boiler. Compared with the orignianl boiler, a strong reducing atmosphere
was formed in the primary combustion zone for the retrofitted boiler,
and for the β of approximately 30°, the arithmetic mean
of NO
x
emissions in the whole measurement
range was reduced by 1073 mg/m3 at 6% O2. Taking
consideration of the environmental and economic effects, the optimal
β for the retrofitted boiler was 20°.
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