Shaker baghouse

A shaker baghouse is a fabric filter that removes dust cake by mechanically shaking the bags. During cleaning, a compartment is isolated from gas flow, and a motor-driven shaker moves the bag support frame or hanger system so the fabric flexes and releases dust into the hopper.

Shaker baghouses are older than pulse-jet designs and are often found on smaller or lighter industrial duties. They can be simple and robust, but they require offline cleaning and enough space for bag movement. They are less suited to very high inlet loadings, sticky dust, or processes that cannot tolerate compartment isolation.

How it operates

During filtration, dust collects on the bag surface and the dust cake provides much of the filtration efficiency. When differential pressure rises or a timer calls for cleaning, the compartment is taken offline. The shaker mechanism flexes the bags for a defined duration. Dust falls by gravity into the hopper before the compartment returns to service.

The cleaning force depends on shaker amplitude, frequency, bag tension, fabric type, cake character, and how fully gas flow has stopped. If gas continues through the compartment during shaking, dust can re-entrain and cleaning becomes less effective.

Failure modes

Common problems include broken shaker arms, loose hangers, poor bag tension, worn fabric, hopper plugging, leaking isolation dampers, and dust cake that is too sticky or compacted to release. Over-shaking can fatigue bags and seams. Under-shaking leaves residual cake and raises fan energy.

Inspection should include the drive, linkage, bag tension, compartment seals, hopper discharge, and dust patterns. A baghouse that repeatedly needs longer shaking may be suffering from moisture, oil contamination, process changes, or poor inlet distribution rather than a weak shaker.

Acoustic cleaning context

Sonic horns can improve shaker baghouse performance by loosening dust before or during the offline cleaning cycle and by keeping hoppers and dead zones clear. They are especially useful where long bags or low-energy shaking leave residual cake. Horns should be coordinated with compartment isolation so released dust can fall rather than be carried straight back to the fabric.

Operating and maintenance context

Shaker baghouses depend on mechanical motion rather than compressed-air pulses. Bags are usually cleaned offline or in isolated compartments so the shaking motion can flex the fabric and release the cake. They suit some lower-temperature, lower-volume, or older applications, but they are less compact than pulse-jet designs and are sensitive to bag tension and shaking mechanism condition.

Maintenance checks include shaker drive bearings, linkages, bag tension, clamps, anti-collapse rings if fitted, compartment dampers, hopper discharge, and whether bags are over-shaken or under-shaken. Failure modes include torn bags near attachment points, poor cake release, dust re-entrainment after a compartment returns online, and mechanical fatigue. Acoustic cleaning can support hopper and plenum housekeeping, but it cannot reproduce the physical bag movement required by a shaker system. If cleaning is weak, the first checks are bag tension, motion amplitude, isolation, and dust moisture.

Related terms

• Baghouse
• Filter bag
• Compartment isolation
• Sonic horn