Advantages and disadvantages of dust filter bags

How many years can the dust bag generally be used?

The specific service life of the dust bag should be calculated according to the operating conditions and the selected material.

From the perspective of filter bag life, the expected service life of the filter bag of the electric bag combination dust collector should be higher than that of the pure cloth bag filter, but the appearance time of the electric bag combination dust collector is still short, and there is no domestic data on this aspect. Therefore, at present, whether it is a combined electric bag filter or a pure bag filter, the service life of the filter bag in engineering applications is generally required to be about 30,000 h.

Advantages of bag filter:

1. High dust removal efficiency, it can capture fine dust with particle size larger than 0.3 microns, and the dust removal efficiency can reach more than 99%.

2. Flexible use, the air volume can be from hundreds of cubic meters per hour to hundreds of thousands of cubic meters per hour. It can be used as a small unit directly installed in the room, near the machine tool, or as a large dust removal room, that is, a "bag room".

3. The structure is relatively simple, the operation is relatively stable, the initial investment is less (compared with the electrostatic precipitator), and the maintenance is convenient. Therefore, the bag filter is widely used to eliminate dust pollution, improve the environment, and recycle materials.

4. Dust disposal is easy. The bag filter is a dry purification equipment that does not require water, so there is no problem of sewage treatment or mud treatment, and the collected dust is easy to recycle.

(1) The dust removal efficiency is high, generally above 99%, and the dust concentration in the outlet gas of the dust collector is within tens of mg/m3, which has a high classification efficiency for fine dust with sub-micron particle size.

(2) The range of air volume to be treated is wide, the small one is only a few m3 per minute, and the large one can reach tens of thousands of m3 per minute.

⑶ Simple structure, easy maintenance and operation.

⑷ On the premise of ensuring the same high dust removal efficiency, the cost is lower than that of the electrostatic precipitator.

⑸ When using glass fiber, polytetrafluoroethylene, P84 and other high temperature resistant filter materials, it can operate under high temperature conditions above 200 ℃.

⑹ Insensitive to the characteristics of dust, not affected by dust and resistance

Disadvantages of bag filter:

1. Some flue gas contains more water, or the dust carried has strong hygroscopicity, which often causes the filter bag to stick and block the filter material. In order to ensure the normal operation of the bag filter, necessary insulation measures must be taken to ensure that the gas The moisture in it will not condense.

2. Some types of bag filter workers have poor working conditions. When checking and replacing filter bags, they need to enter the box.

3. The ability to withstand temperature has a certain limit. Cotton and wool filter materials have a temperature resistance of 80-95 degrees, synthetic fiber filter materials have a temperature resistance of 200-260 degrees, and glass fiber filter materials have a temperature resistance of 280 degrees. The purification temperature is higher. When the flue gas is high, measures must be taken to reduce the temperature of the flue gas.