Understanding the Purpose of Dust Filter Bags

In pulse and air box-type pulse dust collectors, the dust adheres to the outer surface of the filter bag. As dusty gas passes through the dust collector, the dust particles are trapped on the outer surface of the filter bag, while clean gas flows through the filter into the interior of the bag. Inside the bag, a cage provides support to prevent the bag from collapsing and aids in the removal and redistribution of dust particles.

Additionally, dust filter bags function through various mechanisms, including gravity sedimentation, thermal motion, inertial force, and sieving.

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Factors Affecting the Lifespan of Dust Filter Bags

Bag Clogging: When a filter bag becomes clogged, the resistance increases, which can be monitored using a differential pressure meter. Bag clogging is a primary cause of wear, perforation, and shedding.

To address bag clogging, the following measures are generally taken:

Temporarily intensify cleaning to eliminate bag clogging.

Adjust the cleaning cycle to prevent bag aging.

Identify and eliminate the causes of bag aging.

Bag Damage: The shape, installation method, and location of the filter bag can make it susceptible to damage. Regular checks and repairs should be conducted. The following table can be referenced to identify and address specific causes of bag damage:

Replace some or all of the filter bags.

Adjust the installation and operating conditions.

Bag Aging: Bag aging can occur due to abnormal high temperatures, hardening shrinkage, or contact with acid, alkali, or organic solvent vapor. To mitigate bag aging, the following actions should be taken:

Investigate the causes of bag aging.

Implement measures to remove and replace the aged filter bags.

By addressing these factors and taking appropriate measures, the lifespan and performance of dust filter bags can be prolonged, ensuring the optimal functioning of your dust collector system.