Advantages and application scope of bag filter

Advantages and application scope of bag filter

With the increasing social requirements for environmental protection, the application range of bag filter is more and more extensive. At present, the bag filter can be used to deal with high temperature, high humidity, adhesion, explosion, abrasion smoke, and even filter the air containing dust. The flue gas of various industrial kilns and dryers belongs to the flue gas of high temperature. At present, the bag filter can deal with the flue gas under the temperature of 300℃, and the flue gas should be pre-cooled if the temperature exceeds this. In special cases, metal fiber filter material can be directly used to deal with the flue gas at high temperature of 450 ~ 550℃. It is becoming more and more common to treat the flue gas of high temperature kilns such as steam boiler, cement kiln, metallurgical furnace and incinerator with bag-filter. Although the bag filter is limited by the temperature resistance of its filter material, through the appropriate treatment of the system flue gas, has been able to deal with the temperature up to 1200 ~ 1400℃ high temperature flue gas.

Bag filter is mainly composed of ash bucket, filter chamber, air cleaning chamber, support, lifting valve, jet ash removal device and so on. When working, dust gas from the air duct into the ash hopper. Large particles of dust fall directly into the bottom of the dust hopper, while small particles of dust enter the filter chamber along with the airflow transition and are blocked on the outer surface of the filter bag. The purified smoke enters the bag and enters the outlet outlet through the bag mouth and clean air chamber. With the continuous filtration, the dust on the outer surface of the filter bag keeps increasing, and the equipment resistance rises accordingly. Thus, dust removal effect is affected, so when the equipment resistance rises to the value, the dust removal operation should be carried out, and the dust accumulation on the filter bag surface. The bag filter adopts the automatic control flying mechanism to shake and shake the dust for tens of seconds after stopping the machine or the manual control flying mechanism to shake and shake the dust off the inner surface of the filter bag, and the dust will fall on the gray door, drawer or directly on the conveying belt. At present, the single-machine bag filter can be used to deal with the flue gas of high temperature, high humidity, adhesion, explosion and abrasion, and even filter the air containing dust. The flue gas of high temperature and high humidity gas of various industrial kilns and dryers belongs to the flue gas of high temperature, most of which also contains a large amount of moisture and sulfur oxide gas.

Bag filter features:

1. Low pressure pulse jet technology, high efficiency of ash removal, low energy consumption. Use straight through low pressure pulse valves. The injection pressure is only 0.2 ~ 0.4mpa, low resistance, quick opening and closing, and strong ash removal ability. Due to the good cleaning effect and long cleaning cycle, the energy consumption of back blowing gas is reduced.

2. Long service life and good reliability of pulse valve. Due to the low injection pressure (0.2 ~ 0.4mpa), the pressure borne by the pulse valve diaphragm and the low impact force when opening and closing. At the same time, due to the longer cleaning cycle, the opening times of the pulse valve are correspondingly reduced, thus extending the service life of the pulse valve and improving the reliability of the use of the pulse valve.

3. Low running resistance and good spray effect. The deduster adopts the off-line dedusting mode of pulse back blowing in separate chamber, which avoids the phenomenon of dust being adsorbed repeatedly, improves the effect of pulse jet dedusting, and reduces the resistance of cloth bag.

4. The filter bag is convenient to assemble and dismantle and reliable to fix. The upper pumping method is adopted. When the bag is changed, the filter bag frame is drawn out from the clean air chamber of the precipitator, and the dirty bag is put into the ash bucket, which is taken out through the hole to improve the bag changing environment. The filter bag is fixed on the flower plate hole by the elastic rising ring at the mouth of the bag.

5. The air duct is arranged by collecting pipes with compact structure.

6. Use advanced PLC programmable controller for the whole process of dust collector operation.