Baghouse Filter Cage

A baghouse filter cage(also called filter bag cage,baghouse cage,or filter bag frame)is a critical structural component installed inside filter bags in pulse-jet baghouse dust collectors.It supports the filter bags to maintain shape,prevent collapse under negative pressure or airflow,and ensure consistent filtration efficiency and cleaning performance.

1.Basic Structure

Welded from metal wires into a rigid,cage-like frame,typically composed of:

Top cap/ring:Seals and hangs the cage on the tube sheet;some with venturi for better pulse cleaning.

Vertical wires(stringers):Main supporting ribs(8–24 wires,common:10/12/20).

Horizontal support rings:Spaced 4”/6”/8”(100/150/200mm)to reinforce rigidity.

Bottom cap/ring:Protects the bag bottom and stabilizes the cage.

2.Common Materials&Coatings

Selected based on flue gas temperature,moisture,and corrosiveness:

Galvanized carbon steel:Standard for dry,non-corrosive conditions(cost-effective).

304/316 stainless steel:For high-temperature,humid,or corrosive environments(food/pharmaceutical/chemical).

Carbon steel with coatings:Epoxy/silicone/PTFE/PVC coating for acid/alkali resistance and high-temperature stability.

Titanium/Inconel:For extreme high-temperature or highly corrosive industrial applications.

3.Shapes&Dimensions

Shapes:

Round:Most common,uniform support for standard cylindrical bags.

Oval:Larger filtration area in limited space.

Star/pleated:Reduces bag-to-cage friction,increases filtration area.

Diamond/rectangle:Custom for special bag designs.

Sizes:

Diameter:80–200mm(4”–8”).

Length:1.8–6m(6’–20’);long bags use two-piece cages for easy installation.

Wire diameter:3.0–5.0mm.

4.Key Functions&Benefits

Prevent bag collapse:Resists vacuum/pressure during filtration and pulse cleaning.

Optimize filtration:Maintains full bag surface area for maximum dust collection efficiency.

Extend bag life:Reduces fabric wear,flex fatigue,and abrasion.

Enhance cleaning:Ensures uniform airflow and effective pulse-jet cleaning.

Ensure compliance:Supports stable emissions control for environmental regulations.

5.Industrial Applications

Widely used in industries with dust and fume emissions:

Cement,steel,power plants

Chemical,pharmaceutical,food processing

Waste incineration,asphalt plants

Mining,metallurgy,and woodworking

6.Installation&Maintenance

Installation:Insert into filter bags;top cap seals to the tube sheet;snap-band or flange design for easy mounting.

Maintenance:Regular inspection for bent wires,broken welds,or corrosion;replace damaged cages promptly to avoid premature bag failure.