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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
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).
Working
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.
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.
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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