Bag length problem of bag dust collector
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Due to site restrictions, it is often necessary to lengthen the bag length of the bag dust collector. Generally, manufacturers will set the bag length to 6m or 6.5m. Now I am encountering a project where the bag length must be set to 8m before it can be placed under the dust collector. I would like to ask whether this situation will affect the dust cleaning in the future? Is there any good way to solve it?
6m, we make it even smaller. I think as long as the bag is fixed well and the dust can escape smoothly, it should be fine. Tell me if you have ever done it?
This post was last edited by zfc318 on 2009-5-6 13:01 The length of the bag cannot be lengthened casually. It must be determined according to the strength of the pulse valve or pulse cleaning method. When cleaning, the principle is that if the cleaning pressure can be guaranteed, it can also have a relatively large effect on the bottom of the bag. If you need to calculate and confirm, you can consult the pulse valve manufacturer.
A bag length of 8M should be enough, and now there are bags up to 10M. As for the selection of pulse valves for the injection system, Australia Plateau has a set of software
There should be no problem, but pay attention to the design of the dust cleaning system.
The supporting design includes the dust cleaning system, the design of the air inlet bell mouth, the design of the air flow distribution plate, the design of the ash hopper capacity, etc. It is not a simple extension.
I agree with the point above. The lengthening of the bag must be coordinated with the craftsmanship. The most important thing is to strengthen the injection system.
It can be 8m, the key lies in the nature of the dust and the backflush method. If it is difficult to clean dust only by backflushing, mechanical vibration can be added for dust cleaning.
The length of the bag is determined by its aspect ratio, that is, the ratio of length to diameter. The aspect ratio is generally 5-40, and 15-25 is commonly used. Although the floor space can be reduced when the length-to-diameter ratio is high, the bag mouth wind speed should be considered. Because for a filter bag of a certain diameter, the longer the filter bag, the greater the air volume of each filter bag, and the greater the wear on the bag mouth. It is generally believed that the air speed at the bag mouth is 1.5m/s. The relationship between the length-to-diameter ratio (L/D) of the filter bag and the air velocity at the bag mouth is:: V=4v(L/D) In the formula, V is the bag mouth wind speed (m/s), v is the filter wind speed (m/s). Hope it is useful to you
It is okay to have a bag length of 8 meters. However, when selecting a pulse valve, you must accurately know the blowing area of a pulse valve, and then determine the maximum number of bags that can be arranged, leaving a margin. In addition, you must also calculate the outlet wind speed of the bag, which should not be greater than 10 meters/second.
As far as I know, there are projects to achieve 12m.
A 3" submerged valve under 5kg air bag pressure, online cleaning 18 160* 10m filter bag, resistance <1200Pa. Therefore, the same steam hammer is used to clean a filter bag. In fact, the design of the dust cleaning system for a 6m bag and a 10m bag is similar.
It is perfectly possible to make the bag 8 meters long, but your injection system needs to be upgraded, and your ash hopper and middle box must be modified. If it is an old one, you can almost buy a new one. You'd better find a professional manufacturer to do the calculations for you.
Projects using 8m bags are everywhere in the country. In the current low-pressure rotary blowing projects in China, almost all the bags are 8m.
8M is okay, but you definitely need to replace the venturi and adjust the original pulse pressure. Also pay attention to the position of the air distribution plate and chute of the box. If you need to change it, you must change it. Otherwise, if the air distribution is uneven, the bag will blow out in a few days.