Air Pollution Control Device For Induction Furnace - Indiaprice: contact company for price
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 steel making capacity in secondary steel sector in India.
It has some distinct advantages:
Low Project Capital Cost
Low Energy Cost
Consumes steel scrap which is a major solid waste
Environment Friendly, as it produces lower emission than Primary Blast Furnace
Uses clean fuel i.e. electrical power
Can be set up near source which saves transportation cost of raw material as well as finished goods
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 furnace. 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 in to refractory lined buckets from where it is further poured in different sizes moulds to get the desired size of steel. Ingot/Billet is allowed to cool down and then the product is separated from the moulds. 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.
Steel scrap which comes from various sources and generally has contamination/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:
Dust & Dirt
Oil & Grease Paint
PVC Coated Steel
Capacity Calculation of Required Equipment
The volumetric capacity of Air Pollution cannot be judged as such but fair engineering estimation can be made with input data like:
Power Rating in KWH
Detail Drawing of Furnace
Air Cooler Arrangement for workers at Furnace Platform
Characteristics of Air Pollution Generated In Induction Furnace
Pollutant : Dust & Dirt, Metal Oxide & Traces of NOx, SO2, CO, CO2
Concentration : Average 600-800 mg/Nm3 Max. 1200-1400 mg/Nm3
Temperature : At Hood: 250-300o C At Bag House: 80-120 o C
Nature of Dust : Non Sticky, Non Abrasive and Non Explosive
The Control Practice adopted in controlling air pollution in this industry mainly depends upon following parameters:
Dust/Gas Concentration at Inlet
Temperature of Flue Gases
Nature of Pollutant i.e. Dust or Gaseous
Nature of Dust i.e. Sticky, Abrasive
Nature of Gases i.e. Corrosive, Non Corrosive
Selection of Technology for Equipssment
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
Suction Hood: 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.
Ducts & Bends: Ducts and Bends are required to convey flue gases from point of suction to the chimney and connect various equipments like Hood, Spark Arrestor, Bag House, ID Fan and Chimney. Their sizes are based on flue gases volume & temperature.
Spark Arrestor: It is used for arresting live particles and large hot particles which can damage & burn bags. It also facilitates in settling of large dust particles and works as a pre-cleaner. Its size depends upon gas volume and unit layout.
Bag Filtration System: It is used for fine filtration of Flue gases to remove dust particulate matter. The dust is retained on one side of Bag 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 Rotary Air Lock Valve. Pulse jet mechanism is carried out through high pressure air with the help of sequencer and solenoid valve.
Id Fan: 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.
Stack (Chimney): 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.
Advantages & Disadvantages of Bag Filter Type System
Low Power Consumption
Dry System, No water pollution
No corrosion of metal except normal wear & tear
Suitable for dust pollution which are the major cause of pollution in induction furnace
Achieves desired characteristic of treated gases even for high dust load, as efficiency of bag filters is very high
Low operation & maintenance cost
Dry system, hence high life cycle of plant
Large Floor Area
With Spark or live particle, bags can burn
Working of Equipment Venturi Scrubber Type System
Venturi Scrubber: 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.
Advantages & Disadvantages of Venturi Scrubber Type System
Low Floor Area
Can handle high temperature gases
Suitable for gas pollution such as SO2, NOx etc.
High Power Consumption to achieve desired standards
Generates Water Pollution
Material of Construction is prone to corrosion hence low life cycle
Choking of pipe, Nozzle and duct (near scrubber) due to Wet condition
High operation & maintenance cost
Can remove submicron particle only with very high pressure drop leading to still high power consumption
Discharge Characteristics as Per Norms
Dust :Less than 150 mg/ Nm3
Temp:Less than 80-100 o C
Gases : Traces of SO2, NOx, CO2 CO
Suction Efficiency : More than 90%
- Posted By: Eros Envirotech Pvt. Ltd.
- Phone: 911612542109
- Address: 109-110, Savitri Complex-1, Dada Motors Building, G.T.Road, India
- Website: http://www.erosenvirotech.com
Published date: June 6, 2013 -
- Business Description: Eros Envirotech Pvt. Ltd. is one of the leading Manufacturer and
Exporters of Lead Acid Battery Recycling Unit, Air and Water Pollution
Control System, Pots for Refining and Alloying, Ball mills for Lead
Oxide accepted all over worldwide. The company from last 2 decade is ISO
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