La description
About Induction Melting Furnace
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Induction Melting Furnace is major steel producing technology
using scrap & sponge iron (directly reduced iron) as main raw
material. This technology contributes significant steelmaking
capacity in secondary steel sector in India and abroad. It
has
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Some distinct advantages:
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1. Low project capital cost
2. Low energy cost
3. Consumes steel scrap which is a major solid waste
4. Environment Friendly, as it produces lower emission than
primary blast furnace
5. Uses clean fuel i.e. electrical power
6. Can be set up near source which saves transportation cost of
raw material as well as finished goods.
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Manufacturing Process
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Induction Furnace Process includes melting of various types of
steel scrap in a pot. The energy required for the melting process
is provided by electrical induction. The feeding of raw material
in the induction furnace is on intermittent basis. As one charge
of scrap melts, slag is removed from the molten metal and certain
alloys are added to achieve the desired grade of steel. Molten
metal is then poured into refractory lined buckets from where it
is further poured in different sizes Moulds to get the desired
size of steel cast. Ingot/Billet is allowed to cool down and then
the product is separated from the Moulds.
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Flue gases are generated during melting of scrap. The
characteristics and volume of these gases mainly depends upon
type of scrap used in the furnace, i.e. with the degree of
contamination in the scrap. These flue gases need proper
treatment for removal of dust particles/gases before being
discharged into the atmosphere.
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Air Pollution
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Steel scrap comes from various sources and generally has
contaminants/coating etc on it. When this scrap is heated
contamination/coating etc. disintegrates from steel and comes out
either as slag or becomes air borne, thus causing air pollution.
The major source of Air Pollution is :
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1. Dust & Dirt
2. Rust
3. Oil & Grease
4. Paint & Galvanized Iron
5. PVC Coated Steel
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Capacity Calculation of required Equipment for Air
Pollution Control Device:
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The volumetric capacity of Air Pollution cannot be judged as
such, but fair engineering estimation can be made with data
like:
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1. Furnace Capacity
2. Power Rating in KWH
3. Detailed Dimensions of Furnace
4. Air Cooler Arrangement for workers at Furnace Platform
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Characteristics of Air Pollution Generated In Induction
Furnace:
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1. Pollutants: Dust & Dirt, Metal Oxide & Traces of NO,
SO , CO, CO x 2 2
2. Concentration: Average ******0 mg/Nm , Max. ********0 mg/Nm
3
3. Temperature: At Hood: ******0 C, At Bag House : *****0 C
4. Nature of Dust: Non Sticky, Non Abrasive and Non Explosive
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Control Practices
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The control practice adopted in controlling air pollution in this
industry mainly depends upon following parameters:
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1. Dust/Gas Concentration at inlet
2. Discharge Standards
3. Temperature of Flue Gases
4. Nature of Pollutant i.e. Dust (Particulate) or Gaseous
5. Nature of Dust i.e. Sticky, Abrasive
6. Nature of Gases i.e. Corrosive, Non Corrosive
7. Control Practices
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Selection of Technology for Air Pollution Control
Device
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The following technologies are usually adopted for Air Pollution
Control System in Induction Furnace industry:
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a. Bag Filter Type System (Dry)
b. Venturi Scrubber Type System (Wet)
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About Bag Filter Type System (Dry Process)
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Working of Equipment Bag Filter Type System
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1. Suction Hood
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Feeding of raw material is an intermittent process in Induction
Furnace and at the time of completion of every heat, molten metal
is tapped with tilting platform of furnace. Hence, it requires a
Movable Hood System so as to facilitate slag removal, raw
material (bulk) feeding and tilting of platform. Hoods are
designed based on crucible diameter and optimum clearance of hood
from furnace.
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2. Spark Arrestor:
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This is a pre-filtration device. It is used for arresting live
particles and medium to large hot particles which can damage
& burn bags. Depending upon factors such as Flue Gas Volume,
Dust Load & Temperature Profile, this can be a
Gravity Chamber or Cyclone (with multiple tubes). The Spark
Arrestor, depending upon actual conditions in any particular
unit, can thus be designed based on centrifugal or gravitational
forces or combination of both, suitable for that particular
unit.
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3. Bag Filtration System :
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It is used for fine filtration of Flue gases to remove dust
particulate matter. Dust particles are retained on one side of
Bags and clean gases are received on other side. The combined
treated gases from all the bags are collected at top of bag house
and are passed through to ID Fan. The dust collected on other
side of bags is de-dusted through pulse air jet mechanism with
high pressure air. The dust is collected at bottom of hopper and
is discharged through a Screw Conveyor and Rotary Air Lock Valve.
Pulse jet mechanism is carried out through high pressure air with
the help of sequencer and solenoid valve.
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4. ID Fan:
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ID Fan provides necessary driving force to convey flue gases from
suction hood to top of the chimney. The volume sucked overcomes
the total resistance offered by equipment and duct with the help
of fluid horse power provided by ID Fan driven by suitable
motor.
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5. Stack (Chimney):
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The generated gases are passed through chimney of suitable height
and diameter. The chimneys are provided and based on volume of
flue gases, temperature, dispersion desired, composition of gases
and legal provisions for height.
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Advantages & Disadvantages of Bag Filter Type
System
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Advantages:
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1. Low Power Consumption
2. Dry System, No water pollution
3. No corrosion of metal except normal wear & tear
4. Suitable for dust pollution which are the major cause of
pollution in induction furnace
5. Achieves desired characteristic of treated gases even for high
dust load, as
   Efficiency of bag filters is very high
6. Low operation & maintenance cost
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Control Practices
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1 Large Floor Area
2 Unchecked high temperature can lead to burning of bags.
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About Venturi Scrubber Type System (Wet
Process)
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Working of Equipment Venturi Scrubber Type
System
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1. Suction Hood:
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Feeding of raw material is an intermittent process in Induction
Furnace and at the time of completion of every heat, molten metal
is tapped with tilting platform of furnace. Hence, it requires a
Movable Hood System so as to facilitate slag removal, raw
material (bulk) feeding and tilting of platform. Hoods are
designed based on crucible diameter and optimum clearance of hood
from furnace.
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2. Ducts & Bends:
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Ducts and Bends are required to convey flue gases from point of
suction to the chimney and connect various equipments like Hood,
Venturi Scrubber, ID Fan and Chimney. Their sizes are based on
flue gases volume & temperature.
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3. Venturi Scrubber:
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In Venturi Scrubber the flue gases are passed through a
converging section where velocity of the gases becomes very high.
The water is sprayed on high velocity gases with high pressure at
throat. The particles in the gases become wet. The purpose of
throat is to provide the area with highest velocity and wet these
particles so that they become heavy and easily removable. The
gases are then passed through a diverging section where lot of
energy is recovered which was lost in converging section. These
gases are then passed through separator where wet dust particles
are collected at bottom and clean gases are passed through mist
eliminator followed by exit from scrubber.
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4. ID Fan :
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ID Fan provides necessary driving force to convey flue gases from
suction hood to top of the chimney. The volume sucked overcomes
the total resistance offered by equipment and duct with the help
of fluid horse power provided by ID Fan driven by suitable
motor.
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5. Stack (Chimney) :
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The generated gases are passed through chimney of suitable height
and diameter. The chimneys are provided and based on volume of
flue gases, temperature, dispersion desired, composition of gases
and legal provisions for height.
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Advantages & Disadvantages of Venturi Scrubber Type
System
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Advantages :
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1 Low Floor Area
2 Can handle high temperature gases
3 Suitable for gas pollution such as SO , NO , etc. 2 x
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Disadvantages :
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1 Higher Power Consumption to achieve desired standards
2 Generates Water Pollution
3 Material of Construction is prone to corrosion hence low life
cycle
4 Choking of pipe, Nozzle and duct (near scrubber) due to Wet
condition
5 Higher operation & maintenance cost
6 Can remove submicron particle only with very high pressure drop
leading to still higher power consumption
7 Material of Construction is prone to corrosion hence low life
cycle
8 Choking of pipe, Nozzle and duct (near scrubber) due to Wet
condition
9 Higher operation & maintenance cost
*0 Can remove submicron particle only with very high pressure
drop leading to still higher power consumption
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Discharge Characteristics as Per Norms
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1. Dust : Less than **0 mg/ Nm3
2. Ÿ Temp : Less than *****0 C
3. Gases : Traces of SO , NO , Co , Co 2 x 2
4. Suction Efficiency : More than *0%
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| Pays: |
India |
| N ° de modèle: |
APCDIF1
|
| Prix FOB: |
( Negotiable ) (Negotiable)
Obtenir le dernier prix
|
| Localité: |
India |
| Prix de commande minimale: |
- |
| Commande minimale: |
1 Set |
| Packaging Detail: |
export worthy packing at extra cost |
| Heure de livraison: |
90 days |
| Capacité de Fournir: |
- |
| Payment Type: |
T/T, L/C |
| Groupe de produits : |
Air Pollution Control Device
|
