Three gases that are highly corrosive in dust bag

Dust bag is the most commonly used dust and flue gas filter material. As long as the selection is suitable, its service life is generally more than one to two years, and only 20% of the dust collector operating cost. When the flue gas or dust in special working conditions needs to be treated by bag filter, the composition and content of corrosive gas should be carefully analyzed during the selection to ensure the long-term normal operation of the dust bag.

Corrosion of the dust bag is often caused by three gases. We have concluded that the following three gases can cause corrosion of the dust bag.

1. Problems with cloth bags used in coal-fired boiler bag filters

Three gases that are highly corrosive to dust bags

Strong oxidizing agents: For example, when the PPS dust bag is working at 160 °C, when the oxygen content exceeds the standard (>12%), a large amount of oxygen can attack the S bond in the PPS molecule and The combination. As a result of the reaction, the PPS fiber becomes dark and brittle, and the strength is lowered. Sometimes you will find that the surface of the PPS fiber bag exposed to the sun will turn brown. If it is not treated for a long time, it will easily cause the fiber strength to drop, which will cause the dust bag to be damaged due to the strong drop. The air contains 21% oxygen and 79% nitrogen (volume ratio). At low temperatures, nitrogen is very stable, but high temperatures cause nitrogen molecular chains to break and react with oxygen to form NO and NO2. NO can be considered, but NO2 is a strong oxidant and can oxidize most of the fibers used for filtration. . The oxidant is nitrogen oxides, hydrogen sulfide, ammonia, chlorine, and the like. Enhanced control over processes and equipment can reduce oxidative corrosion.

2, problems in the dust bag used in the bag filter of the kiln condition

Three gases that are highly corrosive to dust bags

Acid gas: It is often found in the use of high temperature filter media, mainly sulfide. If there is more acid gas in the high-temperature flue gas, it is recommended to use a dust-proof cloth bag with good acid resistance. If an ordinary dust bag is used, the acid fumes will corrode the fiber structure in the dust bag, resulting in a strong drop of the dust bag and eventually damage. The damage marks are from the outside to the inside. Lowering the temperature reduces the corrosion of the acid gas to the dust bag. Acid gases include sulfur dioxide, sulfur trioxide, hydrogen sulfide, hydrogen chloride, hydrogen fluoride, and the like.

3, the problem of cloth bags used in the baghouse of chemical alkali industry industry is easy to occur

Three gases that are highly corrosive to dust bags

Alkaline gas: It occurs mostly in the condition of containing ammonia, mainly ammonia. In the case of breakage and acid corrosion, lowering the temperature can reduce the corrosion of the alkaline gas on the dust bag.