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Which gases make the bag filter bag of the bag filter easily damaged.

Corrosion of dust removal bags is often caused by three gases. We have summarized the following three gases that can cause corrosion of dust removal bags.

1. Strong oxidant: For example, when PPS dust removal bags work at 160 ℃ and encounter excessive oxygen content (>12%), a large amount of oxygen can attack the S bond in PPS molecules and combine with it. The result of the reaction is that the PPS fiber becomes dark and brittle, resulting in a decrease in strength. Sometimes you will find that the surface color of PPS fiber bags exposed to sunlight will turn brown. If left untreated for a long time, it can easily cause a decrease in fiber strength, leading to damage to the dust removal bag due to a decrease in strength. The air contains 21% oxygen and 79% nitrogen by volume. When the temperature is not high, nitrogen is very stable, but high temperatures can cause nitrogen molecular chains to break and react with oxygen to form NO and NO2. NO can be considered lightly, but NO2 is a strong oxidant and can oxidize most fibers used for filtration. Oxidants include nitrogen oxides, hydrogen sulfide, ammonia, chlorine, etc. Strengthening control over processes and equipment can reduce oxidative corrosion.

2. Acid gas: It mostly occurs in the working condition of using high-temperature filter materials, mainly composed of sulfides. If there are many acidic gases in high-temperature flue gas, it is recommended to use dust removal bags with good acid resistance. If ordinary dust removal bags are used, acidic flue gas will corrode the fiber structure inside the bag, leading to a decrease in the strength of the bag and eventual damage. The damage marks are from the outside to the inside. Lowering the temperature can reduce the corrosion of acidic gases on dust removal bags. Acid gases include sulfur dioxide, sulfur trioxide, hydrogen sulfide, hydrogen chloride, hydrogen fluoride, etc.

3. Alkaline gas: It mostly occurs in working conditions containing ammonia, with ammonia as the main gas. Damage and acid corrosion can reduce the corrosion of alkaline gas on dust removal bags by lowering the temperature.

Pub Time : 2023-09-13 11:22:51 >> News list
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