The pulse airflow is directly sprayed into the filter cartridge without passing through the Venturi. This will cause the end of the filter cartridge close to the pulse valve (upper part) to be subjected to negative pressure, while the other end of the filter cartridge (lower part) will be subjected to pressure as shown in Figure 6-29. This will cause the upper and lower parts of the filter cartridge to be cleaned differently, which may shorten the service life and make the equipment unable to achieve effective cleaning.

Dust accumulation in the folding seam of the filter cartridge will make cleaning more difficult. Therefore, filter cartridges with large folding areas (the filter area of ​​each filter cartridge is 20~22m2) are generally only suitable for applications with lower inlet concentrations. More commonly used filter cartridge sizes and 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 the interface should have no air leakage, and can be opened and closed normally, and work reliably.
The pulse controller should work accurately and reliably, and its spray time and interval can be adjusted within a certain range. When the induced spray device is installed 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.