The pulse airflow is directly sprayed into the filter cartridge without passing through the Venturi. As a result, the end of the filter cartridge close to the pulse valve (the upper part) will be under negative pressure, while the other end of the filter cartridge (the lower part) will be under positive pressure, as shown in Figure 6-29. This leads to different cleaning effects on the upper and lower parts of the filter cartridge. Such a situation may shorten the service life of the filter cartridge and prevent the equipment from achieving effective cleaning.
To address this issue, a Venturi nozzle for the filter cartridge can be installed at the outlet of the pulse valve or on the pulse spray pipe. This installation can improve the distribution of the spray pressure, resulting in a more uniform positive pressure spray throughout the height of the filter cartridge.
Dust accumulation in the folding seams of the filter cartridge makes the cleaning process more challenging. Therefore, filter cartridges with a large folding area (where the filter area of each filter cartridge is 20 to 22 square meters) are generally only suitable for applications with relatively low inlet concentrations. Here are more commonly used filter cartridge sizes and their corresponding filter areas.
The air distribution box of the pulse spray device of the filter cartridge dust collector should comply with the provisions of JB/T 10191-2000. The clean air flow should be free of water, oil, and dust. Under the specified conditions, the pulse valve and its interface should have no air leakage, and they should be able to open and close normally and operate reliably.
The pulse controller should function accurately and reliably, and its spray time and interval can be adjusted within a certain range. When the induced spray device is installed together with the spray pipe, the nozzle of the induced spray device should be coaxial with the spray hole on the spray pipe and maintain the same verticality as the nozzle, with a deviation of less than 2mm.