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Cleaning Method Of Bag Dust Collector

Jan. 19, 2020

At present, Bag Type Dust Collector often adopts the air box pulse type and line spray pulse type. Among them, the air box pulse type has the characteristics of simple structure and convenient maintenance. After dust removal, the resistance drop is not obvious.

Bag Type Dust Collector

Bag Type Dust Collector

When designing general dust collectors, Bag Dust Collector Manufacturers recommend choosing a longer cloth bag based on site and cost considerations. However, during operation, we found that when the dust collector with a bag length of 7500mm is selected, the dust removal effect of the lower part of the bag is poor, resulting in an unsatisfactory drop in drag after dust removal. However, a dust collector with a length of 6050mm was selected. It was found that there was little difference in the dust removal effect between the upper and lower parts, and the resistance dropped significantly after dust removal.

The number of baghouses of the bag type dust collector should be multiple. Generally, the offline cleaning method is adopted. The so-called off-line cleaning refers to the separation of the bag for cleaning and the bag for normal operation for cleaning, and it is automatically put into operation after completion.

Therefore, when the dust collector with a small number of boxes is used for off-line ash cleaning, the filtration area changes greatly, which causes the corresponding change in the operating pressure of the boiler. The dust collector with a large number of cabinets relatively solves this problem, and has a small impact on the normal operation of the boiler, which can ensure the stable negative pressure of the boiler, and when the cabinet is offline for maintenance, the impact on the boiler operation can also be reduced. 

During the initial period of the bag filter's commissioning, air leakage occurred from the pulse valve, which caused all off-line valves and bypass valves of the dust collector to be closed due to pressure loss, which caused the boiler to be shut down due to severe positive pressure. After changing the air source controlling the off-line valve and the bypass valve to independent dual air sources, it was found that no matter whether the off-line valve is leaked or the air compressor is stopped, the off-line valve and the bypass valve can be effectively controlled within 30 minutes. Thus ensuring the operation of the boiler.

It is found that the bag type dust collector uses a vertically rising bypass flue. As a buffer settlement area is formed in the corner area, when the bypass is opened for a long time, dust and ash will easily settle, which will block the entrance of the baghouse. When the straight-through flue is used, the flue gas flow is smooth, which eliminates the problem well.

Generally, there are two kinds of smoke emission from the air outlet of the bag type dust collector. One is continuous smoke emission. Due to the long-term aging of the dust bag, the damage is serious. It is not continuous with the flower plate, the flower plate and the flower plate, which causes dust leakage. The other is instantaneous smoke. In this case, although the dust bag is damaged, it is not very serious. When the bag type dust collector is blowing, the instant smoke appears.

So what to do when the bag filter emits smoke?

When it is found that most of the dust-removing cloth bags are damaged, all the dust-removing cloth bags should be replaced. Fortunately, the dust-removing cloth bag should be stopped. At this time, the pulse controller should be closed and the manhole door on the top can be opened to remove the cloth bags. Take out the dust-removal skeleton first, then pinch the spring ring on the upper part of the bag into a concave shape, and pull out the dust-removing bag. Before installing the new bag, the dust on the hole of the flower plate should be cleaned up.

When changing the dust bag of the bag filter, check and analyze the cause of damage. The factors that affect the life of the dust bag include the nature of the dust, the distribution of the air flow, and the processing quality of the dust removal skeleton. If the fabric of the bag is not welded well, welding should be started during the use of the bag, the dust bag should be broken, and it should be welded in time.

The above is the dust removal method of bag dust collector introduced by Pulse Single Bag Dust Collector Factory. I hope to help you.


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