Muffel Furnance
Transcript of Muffel Furnance
-
8/14/2019 Muffel Furnance
1/21
Muffle FurnaceDr.Samir Sitaram Tambe
-
8/14/2019 Muffel Furnance
2/21
IntroductionWhat is a Furnace?Equipment to melt metals
Casting
Change shape
Change properties
Type of fuel important
Mostly liquid/gaseous fuel or electricityLow efficiencies due to
High operating temperature
Emission of hot exhaust gases
-
8/14/2019 Muffel Furnance
3/21
Parts1.Burners: raise or maintain chamber
temperature2.Chimney: remove combustion gases3.Furnace chamber: constructed of
insulating materials4.Hearth: support or carry the steel.
Consists of refractory materials5.Charging & discharging doors for
loading & unloading stock
-
8/14/2019 Muffel Furnance
4/21
Parts
-
8/14/2019 Muffel Furnance
5/21
-
8/14/2019 Muffel Furnance
6/21
Digital muffle fernis
-
8/14/2019 Muffel Furnance
7/21
Electric M.F.
-
8/14/2019 Muffel Furnance
8/21
Barrier Material
Silica Brick
>93% SiO2 made from quality rocks
Iron & steel, glass industryAdvantages: no softening until
fusion point is reached; high
refractoriness; high resistance tospalling, flux and slag, volumestability
Low of expension
-
8/14/2019 Muffel Furnance
9/21
Operating cycle
Heat-up timeSoaking time Steady temp GraphForging time
Fuel use: depends on material andnumber of reheats
Specific fuel consumption depends
upon the type of material andnumber of reheats required
-
8/14/2019 Muffel Furnance
10/21
Type of Furnaces1.Forging FurnaceUsed to preheat billets/ingotsUse open fireplace system with radiation
heat transmission (Genration of Radiatior).Temp 1200-1250 oCOperating cycle
Heat-up time
Soaking timeForging time (adjustment cooling)
Fuel use: depends on material and numberof reheats
-
8/14/2019 Muffel Furnance
11/21
Type of Furnaces
2.Re-rolling Mill Furnace Batch type
Box type furnace
Used for heating up scrap/ingots/billets
Manual charge / discharge of batchesTemp 1200 oC
Operating cycle: heat-up, re-rolling
Output 10 - 15 tons/day-?Fuel use: 180-280 kg coal/ton material
-
8/14/2019 Muffel Furnance
12/21
Type of Furnaces3.Re-rolling Mill Furnace
Continuous pusher type
Not batch, but continuous charge and
dischargeTemp 1250 oC
Operating cycle: heat-up, re-rolling
Output 20-25 tons/dayHeat absorption by material is slow,
steady, uniform
-
8/14/2019 Muffel Furnance
13/21
Refractory walls of a furnace interiorwith burner blocks
-
8/14/2019 Muffel Furnance
14/21
Refractory lining of a furnace arc
-
8/14/2019 Muffel Furnance
15/21
Type of Furnaces4.Continuous Reheating FurnacesContinuous material flowMaterial temp 900 1250 oC
Door size minimal to avoid airinfiltrationStock kept together and pushed
Pusher type furnaces
Stock on moving hearth or structureWalking beam, walking hearth,
continuous recirculating bogie, rotaryhearth furnaces
-
8/14/2019 Muffel Furnance
16/21
Precousationduring operation
To avoid electrical shock,
1. Be installed by a competent, qualifiedelectrician who insures compatibility
among furnace specifications,
2. Always be disconnected from the
electrical supply prior to maintenanceand servicing.
-
8/14/2019 Muffel Furnance
17/21
Cont..
To avoid personal injury:1. Do not stand directly in front of the chamber without wearing a heat resistant face shield, gloves and apron.2. Do not operate or clean furnace without
proper eye protection.
3. Do not use in the presence of flammable orcombustible materials; fire or explosion mayresult.
-
8/14/2019 Muffel Furnance
18/21
Importance over puta
Cost effectiveAny time operatable
Can adjust temp.according toneedMinimum heat loss.
-
8/14/2019 Muffel Furnance
19/21
Research
In Between M.F. and Puta w.r.t.LohaBhasma
Results: 1.Efficasy: 2.Partical size:
-
8/14/2019 Muffel Furnance
20/21
Ref.
www.google.com.
Encyclopedia.com
http://www.google.com/http://www.google.com/ -
8/14/2019 Muffel Furnance
21/21
Thank u