How to select filter bag according to filter material characteristics
Polyester filter material is usually used in low temperature occasions, usually do not need to be covered with film, only when the emission requirements are less than 30 mg/Nm3, or dust is very fine, high humidity to consider covered with film.
Polytetrafluoroethylene (PTFE), also known as teflon after stretch to become a more powerful microporous material, aperture 0.1 mu m ~ 2.0 microns, porosity is greater than 80%, it has excellent chemical corrosion resistance, strong in the sulfuric acid, sodium hydroxide and atomic industrial etchant in five fluorinated uranium are not corrosion, and can hardy heat-resistant, in 200 ℃ ~ 250 ℃ can be used for a long time, and good electrical insulation and smooth surface characteristics. Polytetrafluoroethylene (ptfe) filter is often treated with mulch or acupuncture technology to improve dust removal efficiency and prolong service life.
Nomex filter material can be used for higher temperature and thicker dust particles. Nomex has better resistance to high temperatures, is more resistant to breaking than fiberglass, can use higher injection pressure, and can blow more filter bags with the same pulse valve.
4 glass fiber
Glass fiber of high temperature resistant performance is good, tensile resistance, resistance to acid, alkali and hydrophobic are good, but the glass fiber filter material has not broken easily in the bending, installation and operation, cannot be high pressure ash removal, high requirement for the bag cage defect, but under the condition of existing technology glass fiber after good post-processing and combined with the application of the coated technology, make its filtering performance is very excellent, especially the European and American countries has been widely used in foreign countries.
P84 filter bag is a filter material woven from a fiber with excellent comprehensive performance developed by an Italian company. Its high temperature resistance is slightly inferior to glass fiber, acid - base resistance is good. But because of its special fiber structure is usually not covered with film use, so the filtration efficiency is not as covered with film filter bag, and because of its price is expensive, especially in Europe and the United States market has been less used.