Principles of Bag Filter:
- Separates particles from a gas stream by passing the stream through filter bags. Particles are trapped on the surface of the bags, and clean gas exits the system.
Construction of Bag Filter:
- Filter Bags: Made from woven or felted fabric.
- Housing: Encloses the filter bags and supports the gas flow system.
- Inlet and Outlet: For the gas stream.
- Cleaning System: Mechanisms for periodically removing trapped particles from the bags (e.g., shaking, reverse air flow, pulse jet cleaning).
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Working of Bag Filter:
- The gas-particle mixture enters the baghouse.
- Gas passes through the filter bags, trapping particles on the bag surfaces.
- Clean gas exits through the outlet.
- Periodic cleaning removes the trapped particles, which fall into a collection hopper.
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Uses:
- Dust collection in industrial processes like cement manufacturing, metalworking, and woodworking.
- Pollution control in power plants and chemical industries.
Merits:
- High collection efficiency for fine particles.
- Can handle large volumes of gas.
- Flexible design for various industrial applications.
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Demerits:
- Regular maintenance required to clean and replace bags.
- High operational costs due to frequent cleaning and replacement.
- Pressure drop can be significant, requiring additional energy.
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