3. Particle Abrasiveness
For highly abrasive contaminants (such as cement powder, slag, and ash), aramid fabric pockets (Nomex, Kevlar) are favored due to their abrasion resistance. In moderately abrasive scenarios, such as coal residue filtration, polyester (PES) cartridges with polyurethane coatings are used. For extremely abrasive particles, like quartz sand, baghouse filters for dust collection with multi-layer fiberglass bags, coated with protective surfaces like PTFE or silicone, are effective.
4. Humidity and Tendency to Stick
Moist dust (such as from biomass combustion) requires fabrics with hydrophobic treatment, like PES with a silicone coating or PTFE. For wet and sticky dust, as found in coal boilers, PPS products, which are resistant to hydrolysis, are employed. In high humidity and temperature conditions, such as in the woodworking industry, materials with a Teflon membrane are commonly applied.
5. Type of Contaminants
For sticky or oily contaminants (e.g., in rubber manufacturing or metalworking), fiberglass elements with a fluorosilicone coating are ideal. In the food industry, where easy cleaning is essential, polyester fabrics with a non-stick coating are used. For toxic gases or fine particles, such as silica dust, a dust collection baghouse with PTFE membrane units or composite textile made from PPS and fiberglass is effective.
Here are some specific examples:
Example 1: Aramid fabric bags are employed in cement kilns, able to withstand temperatures up to 392°F (200°C) and resist the abrasive effects of dust.
Example 2: In chemical production, where acids and alkalis are present at temperatures up to 320°F (160°C), PPS with protective treatment is frequently applied.
Example 3: Coal power plants utilize fiberglass pockets with a PTFE membrane, resistant to high temperatures (up to 500°F) and chemical corrosion.
Selecting the correct bag material minimizes maintenance costs and extends equipment lifespan.