Let me briefly explain the structure and working principle of a pulse bag filter for everyone
Pulse bag filter; It is a new type of pulse bag filter improved on the basis of bag filter. In order to further improve the pulse bag filter, the modified pulse bag filter retains the advantages of purification, high body handling capacity, stable performance, easy operation, long filter bag life, and low maintenance workload. Structurally, it includes 1. Upper box: including cover plate, fan, and exhaust port; 2. Lower box: including porous plate, skeleton, filter bag, air inlet, and maintenance door; 3. Dust cleaning system: including controller, electromagnetic pulse valve, air bag, and spray pipe.
Working principle of pulse type bag filter: The dusty gas enters the ash hopper under the suction force of the induced draft fan, and is evenly distributed to each filter bag after passing through the guide plate. Dust is intercepted on the outer surface of the filter bag, while gas passes through the filter bag and is discharged outside after passing through the clean air chamber. Fine dust is adsorbed on the outer wall of the filter bag through various effects. The purified air filtered by the filter bag enters the upper box through the Venturi tube and is discharged from the fan outlet. The dust adsorbed on the outer wall of the filter bag accumulates thicker over time, and the resistance of the dust collector gradually increases. The amount of gas processed continuously decreases. In order to keep the dust collector in a stable state and the equipment resistance within a certain range, it is necessary to adsorb the accumulated dust outside the filter bag. The dust captured by the pulse type bag filter on the outer surface of the filter bag will reduce the permeability of the filter bag, causing the resistance of the dust collector to continuously increase. When the resistance reaches the set value (differential pressure control) or the filtering time reaches the set value (time control), the pulse valve, which is usually in a closed state, is temporarily opened for a period of time (about 0.1s) under the pulse blowing control of the PLC pulse blowing controller. High pressure gas instantly enters the blowing pipe from the gas bag and is sprayed out at high speed from the blowing hole. The high-speed airflow injected into the filter bag will also generate secondary drainage several times that of the injected gas. The combined effect of jet airflow and secondary drainage increases the pressure inside the filter bag, causing it to change from a concave shape to an convex shape. When the deformation reaches a large value, a large reverse acceleration is generated, and the dust adsorbed on the filter bag mainly separates from the surface of the filter bag and falls into the ash hopper under this reverse acceleration, resulting in a decrease in the resistance of the dust collector. The process of removing dust from the surface of the filter bag is called cleaning. The cleaning work is carried out row by row. Every time the pulse valve operates, a row of filter bags is cleaned of dust. The pulse valve operates sequentially according to the set time interval and sequence until a cycle is completed. The entire dust collector has completed one cleaning cycle.
The effectiveness of bag filters in dust removal is related to various factors, but mainly depends on the classification of filter media pulse bag filters. Pulse filters are divided into three different series according to different diameters of filter bags, different arrangements of filter bags in each chamber, and different filtration areas. They are arranged in rows based on the chamber as a unit, and are divided into single and double arrangements. Only double row arrangement, with filter bag size of 130X6000. The pulse injection pressure is generally designed to be low pressure (0.2-0.3Mpa). Only double row arrangement, with filter bag size of 160X6000. Pulse injection pressure is high pressure (0.4-0.5Mpa)
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