If your bag filter has a poor dust removal effect, it consequently cannot achieve good dust purification. As a result, it cannot effectively assist enterprises in their dust-cleaning efforts. Darko will walk you through the issues.
1. Improper Installation
- Chaotic Installation Process
During the installation of the bag filter , if the cage and filter bags are stacked chaotically, the cage may become deformed due to improper handling. A deformed cage directly affects the normal use and lifespan of the filter bags.
- Incorrect Filter Bag Installation
The installation requirements state that the bottoms of the filter bags must not touch each other. Since the bags are not stationary during continuous filtration and cleaning, touching can cause wear. After installation, the filter bags should be vertical to the flower plate. Excessive tilt can lead to long-term friction between the bags or between bags and the wall, causing wear. Friction between the bags and the wall is common, primarily due to insufficient spacing. To avoid such wear, the distance between filter bags should be no less than half the bag’s diameter, and the distance between the bag and the side plate should be 1-2 times the bag’s diameter.
- Loose Filter Bags
In reverse airflow bag dust collectors, the filter bags should have a certain tension after installation, with a pull force of 150-350N for each bag. Additionally, the bags should be retightened every 3-6 months to ensure normal operation.
2. Poor Manufacturing Process
- Rough Cage Processing
A poorly processed cage may show signs of rust, weld scars, and burrs. These issues can accelerate mechanical wear on the filter bags , leading to punctures, leaks, and failure. Therefore, it is essential to choose well-manufactured cages.
- Deformed Tubesheet
If the tubesheet is severely deformed, it may not meet the flatness requirement of 2/1000. This deformation can lead to instability in the positioning of the cage. It affects the verticality of the cage. As a result, direct collisions between the bottoms of the filter bags may occur, damaging them. Additionally, deformation can cause misalignment between the filter bag mouth and the tubesheet holes. This misalignment makes installation difficult. It can also potentially damage the elastic ring, compromising the sealing. Ultimately, this leads to dust leakage.
- Deviation in Tubesheet Holes
If the diameter of the tubesheet holes exceeds the allowable deviation of (0~+1), issues can arise. A deviation of 2 to 3 mm will prevent proper installation of the filter bags. Negative tolerances will require forceful installation, damaging the bag mouths.



3. Unreasonable Design
- Excessive Airflow Velocity
An excessive upward velocity of the dust-laden airflow within the dust collector chamber can significantly damage the lower part of the filter bags.
- High Filter Bag Resistance
The friction between the filter bags and cages increases during the filtration and cleaning process. If the parameters are incorrect, it can lead to poor cleaning results. This results in excessive resistance. Consequently, the pressure difference across the filter bags increases. This increase accelerates wear due to enhanced friction.
- Cleaning Airflow Scouring
The primary cause of damage near the filter bag mouth is the scouring effect of the cleaning air.
4. Unstable Operating Conditions
- Unstable Temperature
Excessively high temperatures can directly impact the lifespan of filter materials, leading to premature damage. Additionally, sparks in the flue gas can burn the filter bags. Installing a spark catcher before the gas enters the dust collector can mitigate this issue.
- Hydrolysis Reaction
Hydrolysis refers to the chemical reaction of a substance with water. This reaction results in decomposition and the formation of new compounds. Furthermore, many common synthetic filter materials are prone to hydrolysis. This is especially true under alkaline conditions. For example, polyester filter materials are particularly susceptible to this process.
- Oxidation Reaction
Oxidation involves the loss of electrons by molecules, resulting in an increase in oxidation states. Some filter materials, such as polypropylene and polyphenylene sulfide, are particularly susceptible to oxidation.
- Acid-Base Reaction
Acid-base reactions occur when filter materials encounter acids or bases. It can degrade their strength and reduce lifespan. The presence of acidic or basic components in flue gas can significantly affect the longevity of filter bags.
5. Conclusion
Analyzing the various reasons for poor dust removal efficiency is essential. Furthermore, Implementing preventive measures is crucial for the stable operation of bag dust collectors. This helps in reducing operational costs and also ensures compliance with emission standards.
Darko is a company that integrates design, manufacturing, installation, commissioning, and after-sales service. Specifically, it specializes in dust collectors, filter bags, cages, and bulk loaders. Additionally, its bag filters use high-efficiency filtration materials and incorporate scientifically reasonable design and manufacturing processes to ensure performance and stability. Moreover, Darko provides regular maintenance and repair services.