Materials used in boiler & furnace

1. Materials Used inMaterials Used in
Boiler & FurnaceBoiler & Furnace
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2. Components of BoilerComponents of Boiler
Boiler drumBoiler drum
Down comersDown comers
Water wallsWater walls
Super heaters and ReheatersSuper heaters and Reheaters
EconomizersEconomizers
Riser tubesRiser tubes
Soot BlowersSoot Blowers

3. Boiler DrumBoiler Drum

4. Materials used of ConstructionMaterials used of Construction
• Drum is made up of stronger material called Ducal W30. TheDrum is made up of stronger material called Ducal W30. The
advantage of this material is high proof stress/UTS ratio andadvantage of this material is high proof stress/UTS ratio and
this will reduce the thickness of drum for 500 MW boilersthis will reduce the thickness of drum for 500 MW boilers
from 5 ¾ “ – 4 ½ “ due to an increase in acceptable stressfrom 5 ¾ “ – 4 ½ “ due to an increase in acceptable stress
from 9 tons/square-inches - 11.7 tons/ square-inches.from 9 tons/square-inches - 11.7 tons/ square-inches.

5. Composition of Ducal W30Composition of Ducal W30

6. Down ComersDown Comers
Material Used for Construction:Material Used for Construction:
• These tubes are made of low carbon steel alloy.These tubes are made of low carbon steel alloy.
• The various compositions of metals used areThe various compositions of metals used are
Carbon 0.15, Manganese 0.5, & Silicon 0.3.Carbon 0.15, Manganese 0.5, & Silicon 0.3.

7. Water WallsWater Walls

8. Material Used for ConstructionMaterial Used for Construction
• Boiler water wall tubes contains (averageBoiler water wall tubes contains (average
values) 0.22% of Carbon, 0.21% ofvalues) 0.22% of Carbon, 0.21% of
Silicon, 0.47% of Manganese, 0.02% ofSilicon, 0.47% of Manganese, 0.02% of
Sulphur & 0.015% of PhosphorousSulphur & 0.015% of Phosphorous

9. Micro structure of water wallsMicro structure of water walls

15. Superheaters andSuperheaters and
ReheatersReheaters
Material Used for ConstructionMaterial Used for Construction
• Superheater and Reheater metals should be of lustrous, hard, goodSuperheater and Reheater metals should be of lustrous, hard, good
conductors of heat.conductors of heat.
• Superheater and Reheater tubes usually are not made of plain lowSuperheater and Reheater tubes usually are not made of plain low
carbon steel.carbon steel.
• The superheated steam temperature reaches 540°C inside theThe superheated steam temperature reaches 540°C inside the
tubes and it might be subjected to temperature of about 700-900°Ctubes and it might be subjected to temperature of about 700-900°C
outside the tubes.outside the tubes.
• The superheater & reheater tubes may be made of carbon-The superheater & reheater tubes may be made of carbon-
molybdenum steel, chromium-molybdenum steel, or 18-8 chromium-molybdenum steel, chromium-molybdenum steel, or 18-8 chromium-
nickel (stainless) steel.nickel (stainless) steel.
• The first metal is ferritic steel, the second metal is austenitic steel,The first metal is ferritic steel, the second metal is austenitic steel,
and the third metal used is a Nickel based alloy.and the third metal used is a Nickel based alloy.
• The third metal compromises of approximately 8-10% MolybdenumThe third metal compromises of approximately 8-10% Molybdenum
and 3.15-4and 3.15-4..15% Niobium & 58% of nickel.15% Niobium & 58% of nickel.
• One important material for superheater is Esshete 1250.One important material for superheater is Esshete 1250.

16. Composition of Esshete 1250Composition of Esshete 1250

17. EconomiserEconomiser
Material Used for Construction:Material Used for Construction:
• The tubes of economiser are made of lowThe tubes of economiser are made of low
carbon steel, which is having a carboncarbon steel, which is having a carbon
percentage less than 0.3percentage less than 0.3

18. Riser tubesRiser tubes
Material Used for ConstructionMaterial Used for Construction
• These tubes are made of low carbon steelThese tubes are made of low carbon steel
alloy.alloy.
• The various compositions of metals usedThe various compositions of metals used
are Carbon 0.15, Manganese 0.5, &are Carbon 0.15, Manganese 0.5, &
Silicon 0.3Silicon 0.3

19. Soot BlowersSoot Blowers
Material Used for ConstructionMaterial Used for Construction
• The material of the nozzles heads areThe material of the nozzles heads are
made of heat resisting SS containing 25%made of heat resisting SS containing 25%
Cr and 12% NiCr and 12% Ni

20. Thank YouThank You