CaO, Na2CO3, NaHCO3, NaCI, etc. are easy to absorb moisture on the surface of the filter cloth, or become a viscous liquid after deliquescence, resulting in difficulty in cleaning, increasing pressure loss, and even could stop operation. In this case, general precautions for handling hygroscopic and deliquescent dust are listed below.
- It should not be continuously operated regardless of whether the dust source facilities are running or not, and should only be activated when the dust source facilities are activated. When dust is deposited on the filter cloth, the moisture should not pass through. Many dryers and sintering furnaces are mostly high-temperature, high-humidity gases. When they are stopped, the temperature drops and the humidity rises, which is easy to absorb moisture.
- Use a filter cloth with a surface that is lint-free. Such as the use of felt filter material. Surface treatment should be carried out. The selection principle is:
- Post-treatment such as surface coating and calendering can also improve wear resistance. For glass fiber filter materials, silicone oil, graphite, and polytetrafluoroethylene resin can improve wear resistance and folding resistance.
- Chemical fiber is superior to glass fiber, and expanded glass fiber is superior to general glass fiber. Fine, short, crimped fibers are superior to coarse, long, smooth fibers.
- The felt material is superior to the fabric. The felt material should be used to strengthen the interlacing property between the fibers. The satin fabric is excellent in the fabric, and the brushing of the fabric surface is also a measure to improve the abrasion resistance.
3. The offline cleaning operation system should be adopted. Fully remove the dust on the surface of the filter cloth during the working time of the bag filter.