Which gases may cause corrosion of filter bag?

The choice of filter bags is very important for how well dust collectors work. The design of the filter bag and the filtration media should be improved to make sure that a lot of dust is removed. Filter bags often get damaged by rust. Below is a list of gases that can damage filter bags:

1. Strong oxidising agents: For example, when polysulfone (PPS) filter bags are used at 160°C with too much oxygen (>12%), the sulfur bonds within the PPS molecules are eroded and chemical reactions are induced. Strong oxidising agents can damage the fibres, causing them to blacken, become brittle and weaker.

When it's hot, nitrogen and oxygen react with each other. This creates nitrogen monoxide (NO) and nitrogen dioxide (NO2). NO2 is a weak oxidant, which means it can oxidise most filter fibres. To stop this, the levels of things that cause rust, like nitrogen oxides, hydrogen sulfide, ammonia, and chlorine, must be strictly controlled.

2. Acidic Gases: Acidic gases, especially sulfides, are common in high-temperature filtration processes. If the flue gas has a lot of acidic gases in it, you should use filter bags that are made to resist acid. The inner fibres of standard filter bags can be damaged by acidic flue gas, which makes the bag weaker and can cause it to burst. Making things colder can stop acid gas from damaging things. Some gases can cause rust. These gases are sulphur dioxide (SO₂), sulphur trioxide (SO₃), hydrogen sulfide (H₂S), hydrogen chloride (HCl) and hydrogen fluoride (HF). For these conditions, it is best to use filter bags made of materials that do not rust, such as P84, PPS or PTFE.

3. Alkaline gases: You can find it in places where there is ammonia. Acid corrosion and alkaline gases can both cause filter bags to burst. Lowering the temperature helps to stop the filter bags from being damaged by gases that are alkaline. PP filter bags are good at resisting alkali and are not too expensive, which makes them the best choice for customers who don't have much money.

If you want to change your filter bags, please feel free to contact me: info@trustyfilter.com