The bag filter is more difficult to deal with the special dust, and the corresponding measures need to be taken, and the following three methods are usually as follows.

1, high dust concentration gas containing high concentration dust and gas, cyclone or gravity dedusting equipment installed as a pre filter, however this will increase the system resistance, power consumption is increased. Therefore, when the dust or material finished without classification, most direct use of bag type dust removal equipment.

Gas bag type dust collecting equipment not all with high dust content. Only bag wider spacing, the outside of the bag filter form with continuous clear ash cleaning device of bag type dust collecting equipment, it is suitable for processing high dust concentration of the gas.

When dealing with high dust content and in the structure of the should as far as possible so that the dust directly into the hopper or add some baffle, to reduce the amount of dust filter bag attached to; to prevent damage to the fabric for friction, should not make the high-speed movement of a direct impact on the dust filtration.

2, containing tar fog dust containing gas treatment containing only tar fog of gas is difficult, however, the gas in the oil mist is not dust containing a considerable amount of multi PI can be filtered. For example, in the asphalt concrete plant, the main stone drying of the flue gas, plus the transport and other exhaust gas in the equipment, in addition to. In the mixing machine and unloading the finished material at. The tar fog produced by the heated asphalt concrete has also entered the equipment. In this case, the filter cloth product attached dust is far more than the amount of oil fog, you can prevent the occurrence of oil mist the bonding of the trouble, to ensure the stable operation.

3, the deliquescence of hygroscopic dust moisture absorption and deliquescence dust such as Cao, Na2CO3, NaHCO3, NaCl and easy after the filter surface moisture hardening or deliquescence become viscous fluid, and even result in cleaning difficulties and pressure loss increases, and even forced to stop running. In this case, general considerations for treatment of hygroscopic, deliquescent dust are listed as follows.

No matter whether the dust source facilities are running or not, we should start with the dust source facilities. When the filter cloth dust layer, should not make the air through the wet. Many drying and sintering furnace gas are high temperature, high humidity gas, when the stop operation, the temperature drop and humidity, easy to moisture absorption. To this end, the device should be installed on the dust removal equipment for small air. In this way, when the dust source device is stopped, it can be fed into the hot air temperature. By pre coating method, namely in the treatment of wastewater containing dust concentration in the lower part of the dust collecting case, first in the cloth with other powder precoating layer only to the pipe supply other powder material, operated for a period of time, filter cloth attached to the one layer in the dust after the capture set need to collect the wet dust.

In the manufacture of electrode and forming carbon products, also have to heat tar fog adhesive mixed with powder process. At this time, if the dust generated grinding and transportation process, can be used only with a part of the tar fog. However, if tar furnace coke tank tail smoke contains tar more should be before flue gas enters the added amount of coke powder to adsorb coke fog can obtain satisfactory results.
If the gas only contains a small amount of oil mist, can be treated separately. That is, adding a suitable amount of powder in the pipeline as a filter, you can use the. After the addition of dust absorb tar fog, should be used as far as possible to return to the manufacturing process.
The cloth, the surface can not afford, not brushed. Such as the use of blanket filter media. Surface treatment should be carried out. Selection principle is:

A, surface coating, pressure and other postprocessing can also improve the wear resistance, for glass fiber filter material, silicone oil, graphite, PTFE resin treatment can improve the wear resistance, folding resistance.

B, chemical fiber is superior to glass fiber, extruded glass fiber is better than general glass fiber; fine, short, curly fiber is better than that of thick, long, smooth fiber.

C, felt material is better than that of fabrics, felt material should be used acupuncture to strengthen the interlacing between the fibers, weaving the satin fabric optimal, brushed the surface of the fabric is to improve the wear resistance measures.

We should use the off line cleaning operation system. Stop in the dust collector working hours, fully remove surface dust filter.