A Brief Discussion on How to Judge Whether the Service Life of Dust Removal Filter Bags Has Expired.

2025-01-03 16:19:27

Dust removal filter bags play a crucial role in the dust removal system. To determine whether their lifespan has expired, the following aspects can be considered: 

I. In terms of the decline in filtration performance 

Change in pressure difference 

In a normally operating dust removal system, the pressure difference between the two sides of the filter bag is relatively stable. As the filter bag's usage time increases and the clogging situation worsens, the pressure difference will gradually rise. When the pressure difference exceeds the safety range initially set by the equipment (generally specified by the equipment manufacturer, such as increasing from the initial 1 - 2 kPa to 3 - 5 kPa), it may indicate that the filter bag's air permeability has deteriorated and its service life may be coming to an end. For instance, in a bag filter, if the difference between the intake pressure and the exhaust pressure is much greater than normal, it is very likely that the filter bag's pores are severely clogged with dust. 

Reduced filtration efficiency 

Test the dust content of the discharged gas. If, under the same working conditions, the dust concentration in the discharged gas is significantly higher than that during the normal operation of the filter bag (for example, the normal emission standard is less than 10mg per cubic meter, but now it is detected to be over 30mg per cubic meter), it indicates that the filtering function of the filter bag is declining and its ability to intercept dust is weakening. This could be due to damage to the filter bag or an increase in its pore size, which is a signal that the filter bag's service life is coming to an end. 

II. Physical Damage Aspects 

Filter bag damage 

Regularly inspect the surface of the filter bags for any damage. This can be done by visual inspection or by using tools such as industrial endoscopes to examine the interior and exterior of the filter bags. If any tearing, perforation or other damage is found (even small damage, such as a few millimeter hole), it will affect the dust removal effect, and at this point, the service life of the filter bag may have come to an end. 

Deformation of filter bags 

After prolonged use, filter bags may deform under the influence of factors such as dust pressure, repeated action of the cleaning system, and high temperatures. For instance, a filter bag that was originally cylindrical may now become elliptical or partially collapsed. This alters the bag's filtration area and method, preventing it from functioning properly and is also a sign that the filter bag has reached the end of its service life. 

III. Chemical Corrosion Aspects 

If the filter bags are exposed to corrosive gases (such as acidic or alkaline gases) for a long time, the material of the filter bags will undergo chemical corrosion. Check the surface of the filter bags for signs such as fading, hardening, and brittleness. For example, for filter bags made of polyester material, after contact with acidic gases, the material strength may decrease and the color may turn yellow, seriously affecting their service life.