First, the filter bag installation process in the common problems
1, use a cage with a point
Bag cage is a kind of installation fittings that can make all kinds of outer filter bags maintain certain shape under the conditions of filtration and ash cleaning. It is the “bone” of the filter bag. The quality of the bag is directly related to the filtering and cleaning effect of the filter bag. Service life. Poor welding of the filter bag is used for installation, and the bag cages with burrs, deformations, etc. of the vertical bars can easily damage the filter bag.
2. Inconsistency between flower aperture and bag opening
Due to the fact that most of the outer filter round bags use elastic expander rings and flower plates to fix and seal, the aperture of the flower plate and the mouth of the bag are inconsistent, which may easily cause the following problems:
(1) The board aperture is too small and the installation is difficult. The installer will damage the bag opening by tapping the elastic expansion ring with a heavy object installed in place.
(2) The flower plate hole is too large, filter bag and bag cage will cause the phenomenon of "bag falling", and the bag mouth is not dense enough, the bag mouth is easy to leak ash, dust removal efficiency can not be guaranteed.
3, non-standard filter bag installation
During the installation of the filter bag, the professional was not organized to provide training for the co-workers, and the installation quality of the filter bag was not supervised and tracked in a timely manner. The installation personnel often used non-standard installation methods.
(1) Install the filter bag without using the sheath, install the filter bag directly. Once the hole in the flower plate has burrs, it will scratch the filter surface and reduce the filtration performance of the filter bag. Especially, the filter bag will be damaged after the surface film is damaged. Great discount.
(2) Adopt the method of installing the filter bag in the whole room and then installing the bag cage, and take timely protective measures for the installed filter energy. The installer can't avoid stepping on the filter bag mouth during handling and installation work, causing deformation of the bag mouth. After the bag mouth is deformed, the bag mouth and the flower plate hole cannot be completely closed and there is a gap. After the operation, dust leakage or even bag falling occurs.
4. After the filter bag is installed, no adjustment is made. The bottom of the bag cage collides with the collision.
With the development of baghouses to larger and longer bags, filter bags and bag cages are getting longer and longer, and colliding the end of filter bags with each other is very common. The bottom of the bag cage is disorderly and uneven, and some of the filter bag body and the bottom of the bag rub against each other. After the filter bag is put into operation, it will cause high damage rate and shorten the service life. The reason for this phenomenon is:
(1) The flower board is uneven, with a certain degree of inclination or unevenness, and the bag cage is skewed toward unevenness.
(2) The bag cage is not vertical, especially the misalignment of the multi-section bag cage to the center of the bag causes the bag cage to tilt.
(3) The bag cage was not adjusted after installation.
Second, preventive measures and implementation methods
1, do a good job of preparing the filter bag before installation
(1) Organize filter bag manufacturers or related professionals to organize construction personnel training before installing filter bags and bag cages, and perform quality tracking and supervision in a timely manner.
(2) Before cleaning the filter bag, clean the interior of the panel and the net chamber. It is best to use compressed air to blow the dust and welding slag inside the chamber into the hopper or open the induced draft fan to discharge the dust into the outlet. Flue.
(3) Carefully check the dimensions between the filter bag, the bag cage and the flower plate to ensure that the three are consistent. At the same time, the stencil holes should be removed to prevent the plate from scratching the filter bag.
2, standard filter bag installation, in strict accordance with operating procedures
(1) When installing the filter bag, use the sheath correctly for installation. Place the sheath first and then install the filter bag.
(2) During installation, the elastic bag of the filter bag is evenly contacted with the edge of the panel. Usually, a "buzzing" sound is heard. The pockets of the bag filter bag and the card panel are tightly clamped. If it is not clamped, then It can be tightly pressed by hand or tapped tightly with rubber hammer to tension.
(3) The three-row filter bag is usually installed immediately after the installation of the bag cage. When the bag is installed, it is installed in rows from the rear end of the nozzle to the manhole door. This can effectively prevent the installer from stepping on the bag mouth of the filter bag. Damage filter bag elastic collar. If the filter bag cannot be installed immediately after the bag is installed, protective measures should be taken for the filter. It is recommended to use the filter paper case and stack it in double layers to cover the bag mouth of the filter bag to prevent stepping on the bag mouth and debris from falling into the bag interior. .
(4) Adjust the inclined impact bag cage, and the bottom of the large bag filter bag adjusted by the professional installation team is neat and tidy. To achieve this, we must first ensure that the level of the board and the vertical shape of the bag cage (the center of the multi-section bag cage must be aligned); Secondly, after the entire room filter bags and bag cages are installed, they enter the bag room for inspection. The filter bags that come in contact with each other are adjusted by rotating the bag cage or reinstalling it.
3, after the filter bag installation quality inspection
After the filter bag is installed, it is also necessary to perform “phosphor leak detection” on the bag filter bag to ensure that the structure of the filter box is free of structural air leakage, that the filter bag mouth and the flower plate are closed tightly and seamlessly; confirm the airtightness of the dust collector system After the integrity is completed, the new filter bag is pre-coated with artificial ash so that a dust layer can be formed on the surface of the filter bag, which can effectively prevent the pollution of the filter bag caused by heavy oil burning in the early stage of the boiler. When the system runs to the normal design parameters, the dust removal of the dust remover is started. System, the dust collector enters normal operation.
The call for "ultra-clean" emissions from industrial smoke dust is becoming more and more important, and new requirements are constantly put forward for dust removal technology. The development of high-performance filter bags and high-quality filter bag installation technologies are effective in responding to the low emissions of dust collectors. Measures. The installation of the filter bag is a tedious and time-consuming task, and many specific details directly affect the final service life of the filter bag, operating pressure difference, and filtration efficiency. Therefore, we must pay more attention to the installation work of the filter bag and carefully analyze the problems that are likely to occur during the installation of the filter bag. Before the installation, organize professional personnel to train construction personnel and perform quality tracking and supervision in a timely manner. After installation, the quality of the installation shall be inspected to ensure that the installation quality of the filter bag can maximize the filtering effect, thereby laying a solid foundation for the normal operation of the high-efficiency dust collector.
(Addtime：2018-4-16)
