Cause of blockage of filter bag of dust collector

Core tips: the common cause of damage in the use of filter bag 1, the improper installation of filter bag: A, the installation process is chaotic, bag cage and filter bag storage is irregular, causing filter bag or bag cage to be extruded and deformed; B, filter bag does not vertical between filter bag and filter bag between the filter bag and the wall between the long friction, leading to the filter bag damage C, blowpipe blowdown, high injection pressure or high frequency of blowing are easy to cause annular damage of bag mouth, and even bag head and bag body are separated.

Common causes of breakage in the use of filter bags

1, improper installation of filter bag of dust collector: A, confusion of installation process, irregular storage of bag cage and filter bag, causing filter bag or bag cage to be extruded and deformed; B and filter bag do not vertically cause long friction between filter bag and filter bag, filter bag and wall panel, resulting in filter bag damage; C, blowpipe skew, jet pressure high or blowing frequency The rate is too high, which is likely to cause annular damage to the pocket and even the separation between the bag and the bag.

2, the equipment is not well made: A, bag cage processing rough, if rust, welding scars, burrs, open welding and other phenomena, it will accelerate the mechanical wear of the filter bag; B, floral board deformation, can not reach the level of 2/1000 requirements, even distorting the uneven phenomenon, resulting in the bag cage vertical degree can not be guaranteed, will cause the bottom of the filter bag will cause the bottom of the filter bag The collision between each other, the elastic steel ring in the filter bag also easily causes damage, so that the installation and seal of the filter bag can not be guaranteed, thus forming leakage and filter bag damage; C, the flower plate hole is deviated, when the flower board also appears 2 3mm deviation, the filter bag can not be installed in place, which will cause the filter bag and the filter bag and the flower plate hole to fall off. The bag filter can not run.

3, the temperature instability of the dust removal equipment: the higher the temperature of the A, the higher the temperature of the flue gas, the faster the chemical reaction is, the more sensitive filter material for oxidation and other chemical reactions, which is easily damaged under such operating conditions, so that its service life is greatly reduced.  When the B and dust removal equipment are running, the temperature should always be kept above the knots. If the temperature is lower than this limit, the water vapor in the flue gas will concentrate, and the condensed water vapor mixed the dirty smoke and dust. It may produce corrosive acid dew, corrosion filter bag or paste bag, resulting in the shortened life of the filter bag or the increase of the running resistance of the dust removal equipment. It is serious that the dust collector can't run. C, dust removal temperature, sparks in flue gas often burn out filter bags.

4, the material selection of the filter material is unreasonable: A, common polyester filter material and aramid filter material are the filter material which can easily be hydrolyzed. The higher the moisture content and temperature in the gas, the faster the damage is caused by the hydrolysis. It is not suitable for the use of this kind of filter material in the water gas or wet conditions; B, common polypropylene filter material and polyphenylene sulfide. The filter material is easy to be oxidized, so it is not suitable to use this type of filter material in the condition of oxygen content exceeding 15%. If C and glass fiber filter materials are used in the dust removal and purification environment containing fluorine smoke, the damage is faster.

Some suggestions and measures to prevent filter bag breakage

A, the skeleton of the root number of roots should be based on the material of the filter material to carry out a reasonable collocation, smooth and smooth and hairless, with sufficient strength, perpendicularity to the industry standard, with the filter bag good.

B, flattened board, smooth surface of the hole in the flower plate, and a large safety distance between the hole of the plate hole and the hole of the flower plate, in order to prevent the error of the floral board and the tilt of the skeleton, and cause the filter bag to wear between the filter bags.

The C and pulse nozzles should be vertical and should be concentric with the hole of the flower plate, with an error less than 2mm..

D and pulse nozzle arrangement have an important influence on the pulse cleaning of bag filter. The pulse nozzle has a distance from the filter bag. After an hour, the induced gas flow is insufficient and the upper pocket of the filter bag is easily damaged. The pressure of the pulse airflow attenuates too much when it is too large, which is not conducive to the flow of air flow into the bag. The specific pulse distance is related to the pulse nozzle diameter, the pulse airflow parameter and the bag diameter. It is necessary to ensure that the pulse gas flow rate and the induced air volume are larger than the volume of the filter bag.

The air distribution board of the E and dust collector should be set up to make the distribution of air flow in each box relatively uniform, and the position and quantity of the air distribution board have a great influence on the distribution of air flow.

F, there should be a certain safety distance between the bottom of the filter bag and the ash hopper. There should be a high and low level gauge in the ash hopper, and ash should be discharged in time when the ash inside the ash hopper is too high.

G, before the installation of filter bag, the site should be neat, filter bag frame spray tube and other facilities put in order, cleaning equipment in the cleaning equipment, installation process should be well - well, can not have influence on the filter and installation of the cross operation.

H, in order to eliminate the possible spark in the flue gas, the effective precaution is to install the spark trap before the flue gas enters the dust collector and remove the spark from the flue gas.

I, affected by regional climate differences, requires the sealing performance of the dust catcher to be better, and the box body to keep warm, so as to prevent local cooling and condensation of the dust removal equipment.

J, the installation of the filter bag is completed. Before the dust removal equipment starts running, lime powder and talcum powder should be used to pre spray the filter bags. The quality of the filter bag is related not only to the quality of the filter itself, but also to the rational design of the dust catcher and the installation, operation and maintenance of the filter bag.