Most industries in China use pulse
filter bag dust collector, and in construction projects, most of the application of pulse bag dust collector. Pulse bag dust collector has many advantages, small size; High filtration speed; Small footprint; Easy maintenance and other advantages.
However, most customers do not understand the use of dust removal equipment and filter bag use, or even know nothing about it. In order to enable customers to prevent problems and solve corresponding problems in use, the use of pulse cleaning filter bags and treatment methods are arranged to provide the majority of users.
According to the problems that occur when the filter bag is applied, and the treatment methods are listed in detail:
1. The lower part of the filter bag is damaged
(1) The outer damage of the lower part of the filter bag is more than 300mm above the bottom of the filter bag, the damage is more on one side, the lower part is serious, and the upward relief is gradually reduced. Local sewing thread will be worn off, and the sewing thread strength is good where it is not worn. Such damage is mostly caused by porous plate deformation, porous plate spacing is too tight, bag cage deformation, filter bag is too long and other reasons. Individual filter bag and dust collector box wall friction damage. Such damage needs to be strictly checked the levelness of the perforated plate, the error should be a square meter small, < 11000, should use a well-made bag cage.
(2) The annular damage of the lower part of the filter bag is mostly seen in the filter dust with higher wind speed or the dust with strong grinding, when one side of the filter bag is damaged, the dust washes the damage diagonal, and the damage continues to expand with the passage of time, and the serious damage of the filter bag can lead to the ring fracture of the filter bag.
(3) The inner wear of the lower part of the filter bag is more common in the contact position with the bag cage, most of which is the diameter difference between the bag cage and the bottom of the bag cage is too large, resulting in the change amplitude of the filter bag cleaning and filtering, and the bag cage friction damage. Replace the bag cage can be solved.
2, filter bag mouth
(1) The damage at the mouth of the filter bag is mostly within 400 below the mouth of the bag, and the damage traces are mostly from inside to outside, the surface layer is first blown off by compressed air, and then the base cloth is blown out, and the filter surface is also blown out. When one side of the filter bag is damaged, the smoke usually passes through the position of low resistance. The flue gas passes through the damaged area to the clean gas chamber, and the dust will scour the damaged area diagonally when the flue gas passes through, resulting in annular damage at the mouth of the bag, and even separation of the bag head and the bag body.
The cause of damage is too high compressed air, blowpipe skew, flower plate deformation and other reasons, after adjustment can avoid damage.
(2) The filter bag mouth is damaged in the groove position, and the damage traces are mostly from outside to inside. The groove is worn off, and the bag head falls off in severe cases.
The cause of damage is improper installation or small diameter of the bag mouth.
(3) The outer edge of the filter bag mouth is damaged within the length of the spray pipe and the flower plate, the damage traces are from the outside to the inside, the fiber and the base cloth are worn or worn off, and even fall off.
The reason for the damage is that most of the bags are poorly installed, the bag mouth is small, or the pressure difference is too high, so that the filter bag is removed from the top of the porous plate on the spray pipe or the dust collector cover plate, and the final friction is damaged. It is commonly seen in the dust removal of blast furnace gas.
3. The bottom of the filter bag is damaged
(1) The bottom of the filter bag is mostly damaged on the outside, and the damaged surface has obvious wear marks. The bottom sewing thread is worn off, the filter material base cloth is worn off, and the bottom of the bag is damaged or the whole falls off when it is serious. Adjust the dust removal work of dust collector hopper to avoid excessive dust accumulation and vortex wear filter bag.
(2) The internal wear of the bottom of the filter bag is mostly seen in the bottom of the bag cage is too small or the filter bag is too long, and the bag cage can only make the bottom of the bag. Filter bag cleaning and filtration action is too large resulting in the filter bag bottom inside wear.
(3) The damage on the inside of the filter bag is mostly due to the large difference between the outside diameter of the bag cage and the inside diameter of the filter bag, resulting in excessive cleaning and filtration of the filter bag resulting in wear on the inside of the filter bag.
(4) The inside damage position of the filter bag is in the bag cage, and there are rust traces at the wear place. Most of them are angular oxide layers formed on the surface after the bag cage is corroded. At this time, the surface of the bag cage is similar to sandpaper, and every cleaning time will seriously friction the filter bag once and eventually wears the filter bag. Replace the bag cage.
4, filter bag body position
(1) Strip wear on the outside of the filter bag
(1) If the damage trace is from the inside out and the damage is on the vertical bar of the bag cage, it means that the vertical bar of the bag cage is welded or rusted, and the filter bag is worn off or the spray pressure is too high and the spray is too frequent, so that the contact position of the filter bag and the bag cage is folded and broken. Replacing the bag cage or adjusting the injection device can solve the problem.
② If the damage trace is from the outside to the inside, the damage is on the vertical rib of the bag cage, indicating that the deformation of the bag cage causes the friction between the filter bag and the filter bag to damage it, and the replacement of the bag cage can avoid damage.
(2) Liquid filter bag the filter surface of the bag body has progressive wear, mostly in the lower part of the bag cage support ring, and the upper part is rarely. This kind of damage is caused by dust washing, and the problem is caused by uneven air distribution and high filtration wind speed.
