Refractories in Cupola furnace
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Transcript of Refractories in Cupola furnace
Presented to:
Sir Rizwan
REFRACTORIES IN CUPOLA FURNACE
What are refractories?
Materials having high
melting point with
properties that make
them suitable to act as
heat resisting barriers
between high and low
temperature zones.
Magnesia carbon brick
Fire clay
Mullite
Chemical composition and
types of refractories.
• In-organic, non-metallic, porous
material.
Objective of
refractories.
• To manage and control high temperature
process and stresses.
Uses of refractories.
• Lining in furnaces, jet and rocket engine
insulation etc.
CUPOLA FURNACE
Cupola is the most common
melting units for cast irons.
It is a vertical shaft furnace,
made of steel plates, lined
inside with refractory.
It resembles to blast furnace.
Coke is the common fuel
employed.
DIFFERENT ZONES IN CUPOLA :
WELL (molten metal collected in this region)
OXIDIZING ZONE (combustion takes place in this region)
REDUCING ZONE (it ranges from top of the combustion zone
initial coke bed)
MELTING ZONE (pig iron is melted in this region)
PRE HEATING ZONE (pre heat the furnace)
STACK (it clears all the zones )
REFRACTORY LINING
There are following 10 types of linings:
1. STANDARD FIRE BRICK
EXCELENT HEAT STABILITY
EXCELENT COMPRESSION STRENGTH
RESISTANCE TO ACID AS ELL AS
ALKALI
RESISTANCE TO HIGH TEMPERATURE
2. CUPOLA FIRE BRICK
• HIGH STRENGTH
• LIGHT WEIGHT
• LONG LIFE
• ACCURATE DIMENSIONS
3. ULTRA GUN 55
USED AT LOWER TEMPERATURE ZONE
4. ULTRA 1600
USED AT HIGHER TERPERATURE ZONE
5. HYDROMAX
HIGH POROSITY
WEAR RESISTANCE
6. RAM WELL
THEY ARE CHEMICALLY MORE STABLE
7. SURGUN
WHERE ORE START MELTING
8. CRITERION
TO RESIST MECHANICAL FAILIUR
9. FIRECLAY
USED AS BINDER DURING LINING OF CUPOLA WITH BRICKS
10. PATCHING MASSES
USED WHERE THERE IS A CHANCE OF FALIUR OF REFRACTORY
Group Members:
Hamza Zahid (MY-042)Muhammad Saqib (MY-046)
Anas Manzoor (MY-062)Syed Kumail Haider (MY-063)