Dust collector filter bags occupy an important position in dust removal equipment. However, due to the unpredictable physical and chemical properties of dust removal flue gas and dust, the occurrence of filter bag corrosion cannot be avoided. So why does dust filter bag corrosion occur? It has attracted the attention of dust collector manufacturers.

The life of the filter bag is shortened, and the corrosion factor is a chemical failure. Now, in many production operations, especially in the case of high temperature, the moisture and chemicals generated are the promoters of the corrosion of the filter bag.

Corrosion is one of the common reasons for the damage to the filter bag of the bag filter. Since the flue gas contains a variety of corrosive substances, the corrosion effect is greater in the high temperature environment, which will cause damage to the filter bag. The main causes of corrosion are hydrolysis, oxidation, acid and alkali corrosion. Among them, hydrolysis and oxidation cause more damage, while acid corrosion is less, and alkali corrosion is less.

(1) Acid and alkali corrosion

The main reason for corrosion is that the flue gas contains acid and alkaline components, and the dew point changes with the concentration of these chemical substances. If the dust collector is started or stopped below the dew point, the SO2 in the exhaust gas will meet water to form H2SO4, which will cause H2SO4. Cause the filter bag fiber to harden, deform, lose its strength and be damaged.

The traces of corrosion damage are mostly radial, and a large area of discoloration is formed on the surface of the filter bag, causing the filter bag to become hard and brittle, and a small number of irregular circumferential holes. can be distinguished by the naked eye. Therefore, if the filter bag is cleaned by pulse under this condition, the damage of the filter bag will be accelerated.

In addition to acid and alkali corrosion, the corrosion of dust removal bags by organic solvents cannot be ignored. It's too low to even detect, but they're real in the exhaust, and the hazard is there. Such as bromine vapor (Br2), although its content is extremely small, the damage to the filter bag is fatal.

(2) Hydrolysis

Fiber hydrolysis is a process in which water molecules enter the fibers and chemically react with macromolecules to break their molecular chains to generate new small molecular substances. As the molecular weight becomes smaller, the tensile strength of the fiber is weakened and damaged. Synthetic fibers produced from polycondensation-type polymers are not resistant to hydrolysis. Such as commonly used polyester, Nomex and other filter materials are prone to hydrolysis.

Only under the combined action of high temperature, humidity and chemicals can the molecules be activated and hydrolysis occurs. The higher the water molecule content and temperature in the flue gas, the more serious the hydrolysis of the filter bag. Different filter materials have different hydrolysis temperatures. The traces of hydrolysis are turbid in color, the strength of the filter bag is seriously reduced, and it is easily damaged. After the sewing thread is hydrolyzed, the filter bag is cracked from the sewing thread, so that the filter bag is no longer cylindrical.

(3) Oxidation

Fiber oxidation is a process in which molecules in fibers lose (or dissociate) electrons, such as PPS fibers. At high temperature (150°C), oxygen molecules attack and combine with "S" in molecules. The PPS fiber will be discolored, hardened and brittle, and the strength will be reduced and damaged. In severe cases, the fiber web will be broken and separated from the base fabric. Oxidation is another major factor in track damage. The filter materials with poor anti-oxidation performance mainly include: polypropylene, polyphenylene sulfide (PPS), etc.

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