Cleaning Methods and Common Problems of PTFE Filter Bags
The PTFE filter bag has good self-lubricity, does not absorb moisture, and can withstand ultraviolet radiation. It can withstand acid and alkali erosion in all PH ranges under continuous operating temperature of 260 ℃ and instant temperature of 300 ℃. PTFE filter bags can be used for flue gas treatment in coal-fired boilers, waste incineration, carbon black production and other applications. Below, this article will focus on the cleaning methods and common problems of PTFE filter bags.
I. The cleaning methods
1. Dust removing. High frequency vibration is used to remove all large dust particles entering the wall of the filter bag, which will not affect the entanglement fastness of the fiber and maintain the good performance of the PTFE filter bag.
2. Drug soaking. Select the appropriate chemical agent to soak the filter bag, remove the oily dirt in the gap of the filter bag, and increase its breathability.
3. Chemical experiment treatment. Take a bag sample and use professional equipment to test the oily composition of the PTFE filter bag, so as to choose appropriate washing materials to clean the filter bag without causing any damage.
4. Detection. The instrument is used to test the physical index of the cleaned filter bag to ensure that the cleaning quality meets the requirements. After the above processes, the cleaned PTFE filter bag can fully meet the requirements for use.
II. Common Problems
1. The mouth of the PTFE filter bag is damaged. The damage to the mouth of the filter bag is mostly within 400mm of the bag mouth, and the damage is mostly from the inside to the outside, and even the bag head is separated from the body. Reason: The damage is caused by the high compressed air, the blowing pipe is skewed, and the deformation of the plate. The damage can be avoided after adjustment.
2. The filter bag body is damaged. If the damage traces are from the inside to the outside, and the damage is on the vertical ribs of the filter bag cage, which means that the vertical ribs of the filter bag cage are de-welded or rusted, the filter bag is worn off or the blowing pressure is too high and the blowing is too frequent, so that the contact position between the filter bag and the bag cage was folded and broken. Changing the filter bag cage or adjusting the blowing device can solve the problem.
3. The lower part of the filter bag is damaged. The damage on the outer side of the lower part of the filter bag is mostly seen within 300mm of the bottom of the filter bag, and the damage is mostly on one side. The lower part is particularly serious and gradually decreases upward. Part of the sewing thread will be abraded, and the thread is strong at the position where it is not worn. This type of damage is most commonly caused by deformation of the perforated plate, too close spacing between the perforated plates, deformation of the bag cage, and filter bags being too long. Some damages are caused by friction of the filter bags and dust collector box walls.
4. The bottom of the filter bag is damaged. Damage to the bottom of the filter bag is more common on the outside, and the damaged surface has obvious signs of wear. The bottom sewing thread is worn off, and the filter base fabric is worn off. In severe cases, the bottom of the bag is damaged or falls off. Adjust the dust removal work of the dust hopper of the dust collector to avoid excessive dust accumulation to form eddy currents to damage the filter bag.
∷
