Air and fuel staging - Politechnika...
Transcript of Air and fuel staging - Politechnika...
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COMBUSTION AND FUELS
AIR AND FUEL STAGING
IN PULVERIZED COAL
FIRED BOILERS
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COMBUSTION AND FUELS
AIR STAGING IN PULVERIZED
COAL-FIRED BOILERS
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COMBUSTION AND FUELS
AIR STAGING IN TANGENTIALLY FIRED BOILERS
over-
under-stoichiometric
axialstaging
ove
r-
radialstaging
un
der
-o
ver-
sto
ich
iom
etr
ic
ove
r-
ove
r-st
oic
hio
me
tric
combinedstaging
ub
der
-
λ<1
λ>1
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COMBUSTION AND FUELS
Paliwo
OFA
λ>1
λ<1
Powietrze
Spalanie z niedomiarem O2
Spalanie z małym nadmiarem O2
OFA nozzles
Air
Fuel
Leancombustion
Richcombustion
AXIS AIR STAGING USING OFA NOZZLES
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COMBUSTION AND FUELS
RADIAL AIR STAGING –
DIFFERENT RADIUS OF COAL AND AIR
FuelA
ir
Fuel
Fuel richzone
30% of air
30% of air
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COMBUSTION AND FUELS
AIR STAGING SYSTEM LNCFS
core air pulverizedcoal
secondary air& oil burner
pulv. coal nozzle 1
pulv. coal nozzle 2
bottom air & oil burner
core air
OFA1 & oil burner
![Page 7: Air and fuel staging - Politechnika Wrocławskafluid.wme.pwr.wroc.pl/.../combustion_en/NOx/Air_and_fuel_staging.pdf · air and fuel staging in pulverized coal firedboilers. combustion](https://reader036.fdocuments.in/reader036/viewer/2022062402/5ad2f41d7f8b9aff738d51ab/html5/thumbnails/7.jpg)
COMBUSTION AND FUELS
OFA NOZZLES IN OP 430 BOILER
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COMBUSTION AND FUELS
OFA NOZZLES ON SIDE WALL OF OP 650 BOILER
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COMBUSTION AND FUELS
FUEL STAGING IN
THE PF BOILERS
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COMBUSTION AND FUELS
FUEL STAGING: Minimum Pollution (PM) METHOD
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COMBUSTION AND FUELS
FUEL STAGING: system of pulverized coal supply
(Power Plant ŁAGISZA)
loose pulverized coal dense pulverized coal
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COMBUSTION AND FUELS
Fuel staging in wall-fire boiler furnace
upper burners for dense pulverized coal stream
burners for loose pulverised coal stream
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COMBUSTION AND FUELS
Combined low-NOx combustion methods I
Low-NOx boiler furnace with cyclone reburning of unburnt char,1 – natural gas, 2 – pulverized coal, 3 – air,
4 – flue gas recirculation, 5 – bottom ash disposal
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COMBUSTION AND FUELS
Combined low-NOx combustion methods II
Low-NOx boiler furnace with fluidized reburning of unburnt char,1 – natural gas, 2 – pulverized coal, 3 – air,
4 – flue gas recirculation
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COMBUSTION AND FUELS
FUEL STAGING:
reburning
Conventional combustion Combustion with reburning
Basic fuel - coal(75-90%)
Reburning fuel(10-25%)
Additional air
Zone of unburnt fuel combustion
λ>1
Reburning zone
λ<1
(reduction NOx to N2)
Basic burning zone
λ>1Coal(100%)
λ>1