Common causes of damage to filter bags in use
1. Improper installation of the filter bag of the dust collector: A. The installation process is chaotic. The storage of the bag cage and the filter bag is irregular, resulting in the deformation of the filter bag or the bag cage. B. The filter bag and the filter bag are not vertical due to the filter bag. The long-term friction between the bag and the filter bag causes the filter bag to be damaged; C. The injection pipe is skewed, the blowing air pressure is too high or the blowing frequency is too high, which may cause the bag mouth to be damaged, even the bag head and the bag body. Separation,
2, the equipment is not well-made: A, bag cage rough processing, if there is rust, welding burr, burrs, open welding and other phenomena, will accelerate the filter bag mechanical wear; B, flower plate deformation, can not reach flatness 2 / The requirements of 1000, even distorted uneven phenomenon, resulting in the verticality of the bag cage can not be guaranteed, it will cause the bottom of the filter bag to collide with each other, the elastic steel ring inside the filter bag is also easy to cause damage, so that the filter bag installation Sealing is not guaranteed, resulting in air leakage and filter bag damage; C, flower board hole deviation, when the board also appears 2-3mm deviation, the filter bag can not be installed in place, will cause filter bag ash or filter Bag and flower plate hole fall off, resulting in bag filter can not run.
3. The temperature of the dust removal equipment is unstable: A. The higher the temperature of the flue gas, the faster the chemical reaction, and the filter materials that are sensitive to oxidation and other chemical reactions are easily damaged under such operating conditions, leading to Its service life is greatly reduced. B. When the dust removal equipment is in operation, it must always maintain the temperature above the knot. If the temperature is lower than this limit, the moisture in the flue gas will be concentrated, and the concentrated water vapor will be mixed with the dirty smoke, which may cause corrosion. Acid dew, corrosion of filter bags or paste bags, resulting in shortened filter bag life or dust removal equipment operating resistance increases, serious will make the dust collector can not run. C. The effect of dust removal temperature and the presence of sparks in the flue gas tend to burn the filter bag.
4, the choice of filter material is not reasonable: A, commonly used polyester filter and Kevlar filter is the most prone to hydrolysis reaction of the filter material, the higher the moisture content and temperature of the gas, the faster the damage caused by hydrolysis, In the conditions containing moisture or moisture, this type of filter media should not be used; B, commonly used polypropylene filter media and polyphenylene sulfide filter media are easily oxidized, so in the oxygen content of more than 15% of the working conditions, Should not use this type of filter material; C, glass fiber filter material if used in the dust purification environment containing fluorine flue gas, the damage is faster.
Some suggestions and measures to prevent breakage of filter bags
A. The number of ribs in the frame should be properly matched according to the material of the filter material, and it should be smooth and smooth without any burrs. It has sufficient strength, and the verticality is up to the industry standard. It fits well with the filter bag.
B, flower board leveling, flower board hole surface is smooth, flower board hole from the box wall, flower board hole between a larger safety distance, in order to prevent flower board error, frame tilt, resulting in collision between the filter bag Filter bag wear.
C, pulse nozzle should ensure vertical, and should be concentric with the flower board hole, the error is less than 2mm.
D. The arrangement of pulse nozzles has an important influence on the pulse dust removal of the bag filter. The pulse nozzle has an optimal distance from the filter bag mouth. When it is too small, the induced air flow is insufficient, and the upper bag mouth of the filter bag is easily damaged; when it is too large The pressure attenuation of the pulsed air flow is too large, which is not conducive to the flow of air into the bag. The specific pulse distance is related to the diameter of the pulse jet, pulse air flow parameters, and the diameter of the bag. It is necessary to ensure that the pulse air flow and induced air volume are greater than the volume of the filter bag.
E. The air distributor of the dust collector needs to set the air distribution plate so that the air distribution of each box is relatively uniform, and the position and quantity of the air distribution plate have a great influence on the air flow distribution.
F. There should be a certain safety distance between the bottom of the filter bag and the ash bucket. The ash bucket should have a high and low material level meter. When there is too much ash in the ash hopper, the ash should be unloaded in time.
G. Before installing the filter bag, the site shall be clean, the structure of the filter bag skeleton blowing pipe and other facilities shall be arranged in order, the impurities in the dust removal equipment shall be cleaned up, the installation process shall be well-organized, and crossover operations that may affect the filter installation shall not be allowed.
H. To eliminate possible sparks in the flue gas, the most effective preventive measure is to install a spark trap before the flue gas enters the dust collector and remove the spark from the flue gas.
I. Influenced by regional climate differences, it is required that the dust collector be better sealed and the cabinets be kept warm to prevent local condensation of the dust removal equipment.
J. After the filter bag is installed and the dust removal equipment is in operation, the filter bag should be pre-sprayed with lime powder and talcum powder. The effect of the use of the filter bag is not only related to the quality of the filter bag itself, but also related to the reasonable design of the filter, and the installation, operation and maintenance of the filter bag.
