About Induction Melting Furnace

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

Air Pollution

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 :

1. Dust & Dirt
2. Rust
3. Oil & Grease
4. Paint & Galvanized Iron
5. PVC Coated Steel

Selection of Technology for Air Pollution Control Device

The following technologies are usually adopted for Air Pollution Control System in Induction Furnace industry:
a. Bag Filter Type System (Dry)
b. Venturi Scrubber Type System (Wet)

About Bag Filter Type System (Dry Process)
Working of Equipment Bag Filter Type System
1. Suction Hood
2. Spark Arrestor:
3. Bag Filtration System :
4. ID Fan:
5. Stack (Chimney):

Advantages:

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

Control Practices
About Venturi Scrubber Type System (Wet Process)
Working of Equipment Venturi Scrubber Type System

1. Suction Hood:
2. Ducts & Bends:
3. Venturi Scrubber:
4. ID Fan :
5. Stack (Chimney) :
Advantages :

1 Low Floor Area
2 Can handle high temperature gases
3 Suitable for gas pollution such as SO , NO , etc. 2 x

Disadvantages :

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
10 Can remove submicron particle only with very high pressure drop leading to still higher power consumption.