air and fuel staging
TRANSCRIPT
COMBUSTION AND FUELS
AIR AND FUEL STAGING
IN PULVERIZED COAL
FIRED BOILERS
COMBUSTION AND FUELS
AIR STAGING IN PULVERIZED
COAL-FIRED BOILERS
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
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
COMBUSTION AND FUELS
RADIAL AIR STAGING –
DIFFERENT RADIUS OF COAL AND AIR
FuelA
ir
Fuel
Fuel richzone
30% of air
30% of air
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
COMBUSTION AND FUELS
OFA NOZZLES IN OP 430 BOILER
COMBUSTION AND FUELS
OFA NOZZLES ON SIDE WALL OF OP 650 BOILER
COMBUSTION AND FUELS
FUEL STAGING IN
THE PF BOILERS
COMBUSTION AND FUELS
FUEL STAGING: Minimum Pollution (PM) METHOD
COMBUSTION AND FUELS
FUEL STAGING: system of pulverized coal supply
(Power Plant ŁAGISZA)
loose pulverized coal dense pulverized coal
COMBUSTION AND FUELS
Fuel staging in wall-fire boiler furnace
upper burners for dense pulverized coal stream
burners for loose pulverised coal stream
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
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
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