To understand the filter cartridge dust collector; To understand the working principle of the filter cartridge dust collector, we need to first understand its structure. The structure of a filter cartridge dust collector consists of an inlet duct, an exhaust duct, a box, an ash hopper, a cleaning device, a guide device, an airflow distribution plate, a filter cartridge, and an electrical control device, similar to the structure of an air box pulse bag dust collector. The arrangement of the filter cartridge in the dust collector is very important. It can be vertically arranged on the box flower board or tilted on the flower board. From the perspective of dust cleaning effect, vertical arrangement is more reasonable. The lower part of the flower board is the filtering chamber, and the upper part is the pulse chamber of the air box. An airflow distribution plate is installed at the inlet of the dust collector.
Below is an introduction to the working principle of the filter cartridge dust collector:
After the dusty gas enters the dust collector hopper, due to the sudden expansion of the airflow cross-section and the effect of the airflow distribution plate, some coarse particles in the airflow settle in the hopper under the action of dynamic and inertial forces; After the dust particles with fine particle size and low density enter the dust filter chamber, they deposit on the surface of the filter material through a combination of Brownian diffusion and screening effects. The purified gas enters the clean air chamber and is discharged through the exhaust pipe and fan. The resistance of the filter cartridge dust collector increases with the increase of the thickness of the dust layer on the surface of the filter material. Clean the dust when the resistance reaches a certain specified value. At this time, the PLC program controls the opening and closing of the pulse valve. Firstly, the lifting valve of the first chamber is closed to cut off the filtered airflow. Then, the electromagnetic pulse valve is opened, and the compressed air expands in the upper box for a short period of time, flowing into the filter cartridge, causing the filter cartridge to expand and deform, generating vibration. Under the action of the reverse airflow brush, the dust attached to the outer surface of the filter bag is peeled off and falls into the ash hopper. After the dust cleaning is completed, the electromagnetic pulse valve closes, the lift valve opens, and the chamber returns to the filtering state. Under the action of the main fan in the system, the dust containing gas enters the gas box at the bottom of the dust collector from the inlet at the top of the dust collector for pre-treatment, and then enters each dust removal chamber in the upper box from the bottom; After the dust particles with fine particle size and low density enter the dust filtering chamber, they are adsorbed on the outer surface of the filter material through a combination of Brownian diffusion and screening effects. The filtered clean gas enters the clean air chamber of the upper box through the filter cartridge and is collected by the exhaust pipe through the fan and discharged from the air outlet. As the filtration process continues, more and more dust will accumulate on the outer surface of the filter cartridge, which will correspondingly increase the operating resistance of the equipment. The resistance increases with the thickness of the dust layer on the surface of the filter material. In order to ensure the normal operation of the system, the upper limit of the dust collector resistance should be maintained within the range of 1400-1600Pa. When this limit is exceeded, the PLC pulse automatic controller should issue instructions for dust cleaning through fixed resistance or timing. The cleaning process of the filter cartridge dust collector is controlled by a pulse controller to open and close the pulse valve. When the pulse valve is opened, the compressed air inside the air bag passes through the pulse
A high-speed and high-pressure injection airflow is sprayed through the small hole on the valve blowing tube, forming an induced defect flow equivalent to 1-2 times the volume of the injection airflow, which enters the filter cartridge together, causing instantaneous positive pressure and swelling and micro motion inside the filter cartridge; The dust deposited on the filter material falls off and falls into the ash hopper. The dust in the ash hopper is continuously discharged through the ash discharge valve. This sequential cleaning method not only avoids the secondary adsorption of dust generated by blowing and cleaning, but also eliminates the need for dust removal. The cleaning process is carried out sequentially in each room, starting from the cleaning of each room and ending with the next cleaning cycle. The fallen dust falls into the ash hopper and is discharged through the ash removal valve. Regularly replace and clean the filter cartridge during this process to ensure filtration efficiency and accuracy. Because during the filtration process, dust is not only blocked, but also partially deposited on the surface of the filter material, increasing resistance. Therefore, the correct replacement time is generally three to five months!
