fired heaters - get
TRANSCRIPT
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FIRED HEATERS
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Chemical reactions and processes take place at high
temperatures and hence heat sources are required.
Various sources of heat
Direct fired heaters
Steam heaters
Thermal fluid heaters, e.g., Dowtherm
Electrical heaters
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Fluid In Fluid Out
DIRECT FIRED HEATER
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Steam to various users
including turbines,
charge heaters,Reboilers etc.
Condensate returnto boilers
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Fluid In Fluid Out
to
heatexchangers
THERMAL FLUID HEATER
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Fluid In
Fluid Out
Electrical Power IN
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RADIATIONZONE
FUEL OIL
FUEL GASSTEAM
CONVECTIONZONE
STACK
DAMPER
NATURAL DRAFT FIRED HEATER
AIR
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RADIATIONZONE
FUEL OIL
FUEL GASSTEAM
PLENUM
CHAMBER
CONVECTIONZONE
STACK
FD FAN
DAMPER
FORCED DRAFT FIRED HEATER
AIR FROM ATMOS.
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RADIATIONZONE
FUEL OIL
FUEL GASSTEAM
PLENUM
CHAMBER
CONVECTIONZONE
STACK
ID FAN
FD FAN
DAMPER
BALANCED
DRAFT FIRED
HEATER
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RADIATIONZONE
FUEL OILFUEL GAS
STEAM
PLENUM
CHAMBER
CONVECTIONZONE
STACK
AIR PREHEATER
ID FAN
FD FAN
DAMPER
STEAM
APH
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BOTTOM OR UPFIRED
SIDE OR END FIRED
TOP OR DOWNFIRED
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CYLINDRICAL HEATER WITH VERTICAL COIL
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SECTION
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Arbor type
Inlet header Outlet header
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Utube
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FINNED TUBES - CONVECTION
STUDDED TUBES - CONVECTION
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Bare
tubes
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150mm TO
200mm thick
castablerefractory
Bottomfloor
200mm
thick
castable
refractory
with one
layer of
brick
lining
1300 - 1600 C
800 - 900 C
350 - 450 C
CERAWOOL
LINING CANBE APPLIED
INSTEAD OF
REFRACTORY
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DETAIL OF CERAWOOL LINING
Heater steelexternal
shell
Bitumasticpaint coating
SS304 foil 0.2mm thick for
corrosion resistance
25mm thick cerawool
pads laid one after another.
Cerawool blankets hold
down bolts
Cerawool is not used in
furnaces with oil fired burners.
Cost is high
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Burner floor
refractory
Air
register
Fuel gas
Fuel oilPilot
burner
Burner
tile
BURNER ASSEMBLY
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METALLURGY OF TUBES
Depends on the fluid inside and the temperature to which the
fluid is to be heated
Tube metallurgy Max. temp (C)
Carbon steel 540
1.25% Cr - 0.5%Mo 5952.25% Cr - 1%Mo 650
5%Cr-1%Mo 650
9%Cr-0.5%Mo 705
SS304,SS316,SS321 815
HK40(25Cr-20Ni) 1010
For any selected metallurgy of tubes the design life shall be
minimum 100 000 hours
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Metallurgy of tube supports
Tube metallurgy Max. temp (C)
Carbon steel 427 C
2.25%Cr-1%Mo 649
19%Cr-9%Ni 816
25%Cr-12%Ni (Plate) 87125%Cr-12%Ni (cast) 982
25%Cr-20%Ni(Plate) 871
25%Cr-20%Ni(Cast) 1093
50%Cr-50%Ni 982
If the fuel oil has more than 100ppm vanadium then the
supports shall be 50%Cr-50%Ni or refractory lined for
corrosion resistance purposes.
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IMPORTANT DOCUMENTS TO BE REFERRED
Process licensor datasheet
Vendor datasheet
API 560 - Fired heaters for general refinery services
API 530 - Calculation of heater tube thickness
Equipment drawings for individual heater for more details
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END
STACK
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RADIATIONZONE
FUEL OILFUEL GAS
STEAM
PLENUM
CHAMBER
CONVECTION
ZONE
STACK
AIR PREHEATER
ID FAN
FD FAN
DAMPER