Reasons for frequent replacement of dust filter bags
The cost of dust filter bag is not high, but because of its characteristic, the average life of a high quality dust filter bag is 2-5 years. If the selection is not suitable or improper, it will reduce the life of the filter bag. The so-called " Many a little make a mickle", if it is to replace the dust filter bag very often, the cost is considerable. So today SIIC team from INDRO filtration is glad to share with you about the reasons for frequent replacement of dust filter bags, hope it can help you save money.
Reasons for frequent replacement of dust filter bags are mainly burnout and abrasion.
1. Burnout: the main reason for the burnout of the duster cloth bag is that the initial layer thickness of the dust bag is not enough, and the temperature of the flue gas is too high. If the flue gas temperature of the long-term treatment of the dust collector exceeds the working conditions of the bag, it is easy to harden and contract the dust filter bag, or to melt the hole. If the thickness of the initial layer is not enough, the flow of sparks in the flue gas or the heating of the dust may also cause the dust filter bag to be burnt out. The dust filter bag burning is mainly reflected in the online replacement of the new dust bag. Since no pre coating is carried out after the online replacement, the high temperature flue gas carries the sparks directly to the cloth bag, which is easy to damage the dust filter bag. Measures to prevent burnout: ensure the initial layer thickness on the surface of the baghouse filter bag.
2. Abrasion: wearing dust filter bag mainly occurs in the middle part of the dust collector. The single filter bag wearing mainly occurs in the range of 1 meter away from the filter bag top. The main reason is that the gas distribution is uneven, the velocity in the middle part of the single chamber is too high. The velocity of the filter gas is too high in the outlet of the single dust collection filter bag, which causes the dust impact and the wear cloth filter bag, and the fabric fiber tension of the dust bag is damaged, the local cloth bag perforation is easy to be perforated and the cycle time is too short. The dust collector filter bags for frequent wear parts are replaced by wear resistant cloth filter bags.
3. The distance between the dust filter bags is too small, and the filter cage bending is easy to cause the wear between filter bags.
4. When the welding joint of the filter cages has holes or burrs, the rough surface caused by corrosion will also accelerate the abrasion of the dust collector filter bags. The loose sealing of filter bags and cell plates will cause the abrasion of the top of the baghouse filter bag.
5. The venturi tube or pulse jet tube is not aligned with the filter bag center, which makes it easy to blow out the airflow and directly wear the upper part of the filter bag. Too often cleaning of cloth filter bags will accelerate the wear of dust collector filter bags.
6. Excessive filtering gas speed will break the initial dust layer and impact the dust filter bag and cause excessive wear. If the number of cleaning bags is too high at this time, it is very easy to loose the fabric of the dust collector filter bag and accelerate the wear of the filter bag. Dust in flue gas exceeds design standard, which will accelerate the wear of fabric filter bags. Too much ash in the ash hopper causes the dust in the flue gas chamber to over speed and accelerates the wear of the filter bag.