Bag-house filter systems are used to extract airborne metallic dust particles from steel melting furnace, thereby releasing clean air into the atmosphere. Dust laden air enters through the bag-house filters entry inlet. This incoming air strikes the filter bags, causing the heavier material to fall to a hopper bottom.
Description
Summary
Bag-house filter systems are used to extract airborne metallic dust particles from steel melting furnaces, thereby releasing clean air into the atmosphere. Dust-laden air enters through the bag-house filters entry inlet. This incoming air strikes the filter bags, causing the heavier material to fall to a hopper bottom. The air with the lighter and smaller materials is filtered by the filter bags and clean air with standard emission rates of 10-100mg/Nm3 is exhausted into the atmosphere through a specially designed stack.
Dust collection process.
The Particulate laden gas is pulled through the baghouse inlet by centrifugal blowers. The blower is located on the downstream side of the baghouse, this pulls gas through the filter media, it is termed a negative pressure bag house.
On the Top of the filter bags orifice, the air is pulsed through high-pressure jets into the interior of the filter bags. This action causes the bags to ripple, knocking off the “cake”/ dust from the outside of the filters. This material/dust is discharged to the residual collecting conveyor system through a rotary airlock fixed at the bottom of the hopper system.
Inside the bag filter, cylindrical bags made of polyester / special material (as per required in the application) are intercepted in the flow path of air and the particles are collected onto these filters by mechanisms of interception, inertial impaction, and diffusion. The pulse jet collector is a continuous automatic filter capable of filtering dust-laden air through a felted non-woven filter media.
The hoppers are located below the filter bags. Collection hoppers are used to temporarily store the collected ash that is dislodged from the filter bags by the cleaning mechanism process. Many hoppers are designed to include vibrating mechanisms to assist in dislodging the cake/ dust inside the hopper when discharging the particulate matter. The collected dust material in the hopper is discharged from the bag-house filters through a rotary airlock to be collected in the residual collecting conveyor system.
Components of Bag filter
- Top Chamber
Fabricated with MS 5mm thick plate and sealed on all sides to prevent clean air leakage and maintain the pressure drop as designed.
- Dirty Air Chamber
The dirty air chamber is installed below the Top chamber and contains all filter bags of 2 – 6 Mtrs in length which are fixed inside of the cell plate in the top chamber.
- Pulsing pipes and solenoid valves
The pulsing pipes are loaded with compressed and pulsing valves fixed at the start of the pulsing pipes. The pulsing valves are solenoid operated containing a plunger releasing high bursts of compressed air momentarily whenever the cleaning process is initiated for filter bags.
- Filter Bags and Wire cage
We use woven or non-woven filter bags having inlet fume temperature resistance from 120 to 140°C. These filter bags are supported by a wire cage which resists the filter bags from wear and tear while the cleaning process.
