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Study on influencing factors and Countermeasures of bag filter dust removal effect

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Research on influencing factors and Countermeasures of dust removal effect of bag filter

Source: Botou Kangyue environmental protection Release time: 2020/1/27 11:50:34
Bag filter is a kind of dust filtering device, which uses the physical properties of dust to remove and purify the dust containing gas. The main materials of the bag are textile filter cloth and non-woven felt. When the air containing dust enters the bag filter, the dust with larger particles and larger proportion will settle due to its own gravity. The smaller dust will be blocked when passing through the filter material of the bag, and the air will be purified. Bag filter is often used in various steel mills, ironworks and coking plants.
Bag filter The utility model is a dust filtering device, which uses the physical properties of dust to remove dust and purify the dust containing gas. The main materials of bag are textile filter cloth and non-woven felt, when the air containing dust enters Bag filter The dust with larger particles and larger specific gravity will settle due to its own gravity, and the finer dust will be blocked when passing through the filter material of the bag, and the air will be purified. Bag filter is often used in various steel mills, ironworks and coking plants.

1、 Influencing factors of dust removal effect of bag filter
(1) Material selection and model of dedusting bag
The main component of bag filter is bag. Selection of bag type and material_ It greatly affects the dust removal effect of the dust collector and the service life of the bag. The better the quality of the bag, the longer the service life, the better the dust removal effect. The quality and speed of dust in the air will affect the use effect and service life of the bag. 1、 The shape and size of some dust are irregular, and the fine dust is not easy to be affected by the dust collector. The new bag hole net is larger, and the dust removal effect is not obvious. Only when the bag filter is used for a period of time, the dust on the surface of the bag becomes more and more, which can intercept the fine dust more easily, so as to improve the dust removal effect of the dust collector. 2、 When the dust in the air is sucked into the dust collector by negative pressure, it will produce impact force on the bag due to its fast speed. Long lasting impact will wear the bag, so the service life of the bag will be greatly reduced. At the same time, due to the rapid movement of part of the dust_ It is easy to punch through the fine hole to reduce the dust removal rate of the dust collector. 3、 If the selection of bag type is not correct, there will be a large with a small situation, the combination of bag and keel is loose, dust will leak from the gap, greatly reducing the use efficiency of the dust collector, and even more serious problems will appear. In the case of small belt large, bag dropping and even black smoke may occur after dust removal for a period of time.
 

(2) Influence of back blowing system
Most of the bag filters are equipped with pulse back blowing system, which can provide protection for the operation of the dust remover. Pulse back blowing is carried out through the principle of back blowing air, which can remove dust to a great extent, but there are still many shortcomings. 1、 In the operation of the blowback system, due to the strong vibration, the back blowing pipe is often loose or the parts are loose. The pressure difference of dust removal system is increasing, which leads to the decrease of dust removal effect. 2、 Pulse back blowing is the use of air compression to protect the operation of pulse dust removal. If the air compression is not timely or stopped, it is easy to increase the pressure difference Dust bag Have a serious impact. At the same time, if there is more water vapor in the air, the cloth bag will become moist, causing the air permeability of the bag_ Under the influence of Dabao, the air permeability of the bag is decreased, and the wear of the bag is accelerated, and the service life of the bag is reduced. Under the influence of water vapor, the solenoid valve can not work normally, and can not control the pulse valve and off-line valve normally, so as to reduce the dust removal effect. 3、 The operation of pulse back blowing also needs to be adjusted according to the environment and production. Only proper operation can give full play to Zui's good effect.

(3) Sealing of dust collector shell and dust removal point
One of the important factors affecting the dust removal effect is the sealing of the dust collector shell and the dust removal point. Bag filter in the use process is generally negative pressure, if there is too much air leakage_ It is easy to cause short circuit of the gas circuit, reduce the air volume of the dust removal system, thus causing dust, and reducing the dust removal efficiency of the dust collector.

2、 Measures to protect dust removal effect
(1) Choose the right bag and keel
Quality of bag_ In the selection of bag materials, the existing bag materials can be compared one by one. After full analysis of different materials, Zui is determined as the suitable bag material according to the economic cost. The keel also plays a role in the dust collector_ Each cloth bag is connected by three keels. If the keel material is not suitable or the connection is wrong, it will have a great impact. Therefore, careful screening and comparison should be carried out when selecting the keel.

(2) Pulse back blowing system
Due to the strong vibration of the pulse system during operation, reverse blowing pipe and other parts_ Easy to fall off. Special methods can be used to install these parts. For example, add additional spring pad screws or change the original installation method to welding mode to ensure smooth operation of the equipment and avoid frequent drop or loosening of the blowpipe. In addition, to avoid too much water vapor into the dust collector, the water vapor in the air is unavoidable. Therefore, in wet rainy days, the equipment can be stopped in time to avoid the dust collector failure caused by too much water vapor. At the same time, regular inspection and maintenance should be carried out for the dust remover, so as to maintain the efficiency of the dust remover at all times and protect the service life of the dust remover.

(3) Ensure the sealing point of the shell
If the tightness of the dust collector cannot be protected, some dust will leak out from the gap when the dust collector is running, which greatly reduces the dust removal effect of the dust collector. Therefore, when installing the dust remover, the observation window, cover plate and dust removal pipeline can be strengthened, and the cover plate, inspection device and equipment connection can also be sealed with heat-resistant glass or plastic butter to ensure its sealing.

(4) Strengthen people's awareness of environmental protection
Only people from their own consciousness can solve the problem from the root, dust removal work will have an impact on all aspects of people, so it is urgent to strengthen people's awareness of environmental protection. Bag filter is to help people maintain a good production environment and ensure people's physical and mental health. People should start from their own, in the use of bag filter to ensure the good operation of the dust collector, do a good job in the inspection and maintenance of the dust collector. At the same time, in addition to the dust removal work, we should establish perfect rules and regulations to restrict people's behavior, strengthen the maintenance and management of the dust remover, and give full play to the ability of the staff to do a good job in the protection of the dust remover.

(5) Reduce the switch of dust remover
Due to the complex use environment and high temperature of large-scale dust remover, frequent start-up or stop of the operation of the dust collector will affect the dust collector, not only affect the dust removal efficiency of the dust collector, but also reduce the service life of the dust collector.

3、 Conclusion
The application of bag filter is more and more widely. It also plays an important role in dust removal and makes great contribution to environmental protection. This paper analyzes the bag selection, back blowing system, dust collector shell and dust collector seal Bag filter The existing shortcomings, put forward the corresponding solution strategy, for the dust collector to enhance the dust removal effect.
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