The main measures to prevent bag filter bag damage

The main measures to prevent bag filter bag damage

If you encounter serious damage to the bag of a bag filter during your daily use, it can be very troublesome and requires timely measures and maintenance. But how can we avoid this phenomenon from happening? Below is an introduction for everyone.

During the operation of a bag filter, the main forms of bag damage include burning, wear, tearing of the bag bottom, and opening of the wire. The main reasons for bag burning in bag filters are excessive flue gas temperature (flue gas temperature exceeding the working temperature of the bag) and spark burning of the bag.

1、 The main measures to prevent smoke from overheating and burning bags are:

Install cold air valves on the flue at the boiler outlet or use water spray cooling measures. The boiler dust collector is designed with a cold air valve. When the flue gas temperature reaches a certain level, the cold air valve opens and the flue gas temperature can be reduced at a suitable speed; If the temperature of the flue gas continues to rise and reaches the opening temperature of the bypass valve, the lifting valves of each compartment will close and the bypass valve will open, and the flue gas will be directly discharged through the bypass flue.

2、 The measures to prevent Mars from burning bags include:

1) Choose filter bags with stable performance materials.

2) Using pre dust removal technology, the bag filter body structure adopts an airflow distribution baffle to avoid direct impact of sparks on the bag, while allowing larger diameter unburned particles to fall directly into the ash hopper.

3、 The main reasons for bag wear are:

1) Uneven distribution of smoke and high local filtration wind speed in the air chamber lead to increased impact of dust and wear on the cloth bag; 2) The distance between the cloth bags is too small, causing collision and wear between the cloth bags, or the cage bone is bent, or the gap between the cage bone and the bottom of the cloth bag is too small, causing collision and wear between the cloth bags and the cage bone; 3) The vertical deviation between the nozzle of the spray pipe and the mouth of the bag is large, which causes the airflow sprayed from the spray pipe to directly wash the upper part of the bag, resulting in wear and tear; 4) Frequent cleaning of cloth bags or excessive spraying pressure can also accelerate the wear of cloth bags.

4、 The measures to reduce bag wear include:

1) When designing, the cloth bags should be distributed reasonably to balance the airflow.

2) During installation, the alignment between the nozzle of the spray pipe and the bag mouth should be controlled properly.

3) At the beginning of operation, a low blowing pressure and a long blowing cycle should be maintained, and a certain thickness of initial dust layer should be maintained on the surface of the bag.