After the dust gas enters the dust collector, due to the sudden expansion of the air flow section and the effect of the airflow distribution plate, a part of the coarse particles in the air flow under the action of dynamic and inertial forces, and the dust particles with fine particle size and small density enter the filter chamber, and the dust is deposited on the surface of the filter material through the combination of Brown diffusion and sieve filtration. The purified gas enters the net gas chamber and is discharged by the exhaust pipe through the fan. The resistance of filter cartridge filter increases with the increase of dust layer thickness. When the resistance reaches a specified value, the dust is cleaned. At this time, the PLC program controls the opening and closing of the pulse valve. First, the lifting valve is closed, the filter air is cut off, then the Electromagnetic Pulse Valve opens, the compressed air and the short time expand rapidly in the upper box, pour into the filter tube, make the filter tube inflate and deform the vibration, and attach to the filter bag under the action of the reverse air flow. The dust on the surface was stripped into the ash hopper. After the ash is cleared, the electromagnetic pulse valve is closed, the lifting valve is opened, and the chamber is restored to filtration state. Each chamber of ash removal is carried out in sequence, starting from the first chamber ash cleaning to the next dust cleaning period and a cleaning cycle. The falling dust falls into the ash hopper and is discharged through the ash valve.
During this process, the filter must be replaced and cleaned regularly to ensure the filtering effect and accuracy, because in the filtration process, the dust is deposited on the surface of the filter and increases the resistance in addition to the barrier, so the general correct replacement time is three to five months.
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