XMC pulse spray bag dust collector cleaning cycle process
Bag filters are widely used in the collection and filtration of various industrial dusts. So how does a bag filter (working principle) collect dust? What kind of process is its cleaning cycle? Tianhong will give a brief introduction to the working principle of the bag filter today.
1. When the dust and flue gas are filtered by the bag filter bag, the filter material fiber depends on the dust screening, interception, inertia, diffusion, adhesion, static electricity and gravity, and the dust is blocked by the filter bag on the surface to reach the dust Separate from the gas, so as to achieve the purpose of purifying the flue gas.
2. The dust-containing gas enters the ash hopper under the attraction of the induced draft fan, and is evenly distributed to each filter bag after passing through the deflector. The dust is intercepted on the outer surface of the filter bag, and the gas passes through the filter bag. (Inertial collision, interception and diffusion should increase as the fiber diameter and the pores of the filter material decrease, so the fiber of the filter material is thinner and denser. The better the dust filter effect is) It is discharged outside after passing through the clean air chamber. The dust collected by the bag filter on the outer surface of the filter bag will reduce the air permeability of the filter bag and increase the resistance of the filter. At this time, the dust removal device will cause the powder layer to peel off and settle, and wait until the resistance reaches the set plant ( Differential pressure control) or the filtering time reaches the set value (time control), the pulse valve that is usually closed is opened for a very short period of time (about 0.1s) under the pulse blowing control instrument PLC pulse blowing control, high pressure The gas enters the blowing pipe from the air bag instantly, and is ejected from the blowing hole at a high speed, restoring the resistance of the filter-bag.
3. Therefore, the bag filter is a working process of periodic dust collection and dust cleaning. Different types of bag filters have different dust cleaning structures and methods. The high-speed air jet injected into the filter bag will also produce a secondary drainage that is several times that of the jet air. The combined action of jet airflow and secondary drainage makes the pressure inside the filter bag rise rapidly, and the filter bag changes from a concave shape to a convex shape, and a large reverse occurs when the deformation reaches a large value of Z Acceleration, the dust adsorbed on the filter bag is mainly under the action of this reverse acceleration, leaving the surface of the filter bag, falling into the ash hopper, and the resistance of the dust collector drops accordingly.
4. The process of removing dust from the surface of the filter bag is called deashing. The dust removal work is carried out in rows. Each time the pulse valve is actuated, a row of filter bags will be cleaned. The pulse valve operates in sequence according to the set time interval and sequence until a cycle is completed.
In this way, the entire dust collector has completed a cleaning cycle.
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