Dust bag, also known as filter dust bag, dust filter bag, dust collector bag, etc., is a key part of the bag filter operation process, usually cylindrical filter bag hanging vertically in the dust collector.

Dust bag is usually made of fiber as raw material, using the filtering effect of fiber fabric to filter the dust containing gas. After needle-punching, shaping, burnishing, calendering, laminating and other treatment processes, it makes its dust removal performance more superior. However, under high temperature, friction, stretching and other working conditions, the service life of dust bag is greatly reduced. So, how to extend the service life of dust bag and make it reach the best condition?

Factors affecting the service life of dust bag

1、Flue gas volume

Small area, large wind speed, which leads to increased pressure on the dust bag. Over time, it will cause wear and damage to the dust filter bag. The coal type is good or bad, determine the size of the flue gas volume, the size of the flue gas volume directly affects the service life of the dust bag.

2、Flue gas content

After the dust enters the dust collector, due to its diameter, lightness and weight is not the same, resulting in some of the larger diameter of the dust with the influence of gravity fall, the particle size of the smaller dust in the role of wind speed will produce kinetic energy. When the dust is intercepted on the filter bag or bonded to the surface of the filter bag, it will produce a strong sense of impact on the filter bag. Under the impetus of kinetic energy, the dust continuously rushes the filter bag. If the flue gas content is relatively large, the wind speed is also very large, dust filter bag will withstand tens of thousands of times the friction, resulting in the surface of the filter bag fiber off.

3、Dust particles

According to the particle size of dust is divided into three kinds of coarse dust, fine dust and apparent micro-dust. Particle size is different, the impact on the dust filter bag is not the same. When the dust content has acidic and alkaline values, due to the small diameter and intercepted by the bag. And can not fall off from staying on the surface of the filter bag or into the inside of the filter bag. After the action with water, it will stick to the surface of the filter bag, resulting in the corrosion of the filter bag.

4, the material type of soot

Dust according to the category can be divided into organic dust, inorganic dust and mixed dust. For the analysis of inorganic dust, there are mainly FeA, CaO, MgO, Si02, elements. Among them, Si02 and Fe203 are the two elements that seriously affect the filter bag. In the role of wind speed, resulting in the high frequency of flushing of the filter bag, increasing the damage to the filter bag.

5、Indicators of temperature

Filter media in accordance with the amount of temperature can be divided into room temperature filter media, medium temperature filter media and high temperature filter media. Generally speaking, it can withstand high temperature in about 200℃~300℃, and the temperature tolerance of glass fiber filter media is 300℃, but the best temperature should be controlled at about 260℃.

6、Distribution of airflow

The distribution of airflow is also an important factor affecting the filter bag, if the dust collection equipment in the design of the airflow is unreasonable resulting in excessive local airflow. Working under such conditions will cause damage to the filter bag. The usual solution is to design a deflector plate in the dust collector to change the direction of airflow.

Measures to extend the life of the filter bag

1、Appropriate filter air speed
Usually, when the dust concentration is high, the air speed of the filter should be lower, and vice versa. The smaller the dust particles, the lower the air speed of the filter, and vice versa.

2、Pre-painting to prevent oil adhesion
When the boiler is ignited and running under low load, it usually takes a long time to drain the oil. If the oil and fumes through the filter bag without prior treatment of the filter bag, will cause irreversible damage to the filter bag.

3, the correct blowing pressure and pulse width
Adjust the appropriate blowing pressure and pulse width to avoid excessive blowing pressure.

4、Appropriate exhaust temperature
Strictly control the change of exhaust temperature to prevent it from being too high or too low.

5、Maintenance before and after shutdown
Before the bag stops running, it is usually necessary to spray several cycles continuously to keep the dust accumulation in the filter bag at the lowest level, while transporting all the dust in the dust collection hopper to the ash storage device.

In 2016, Anhui Yuanchen Environmental Technology Co., Ltd (hereinafter referred to as "Yuanchen Technology") introduced advanced German equipment Autefa needle punching production line and automatic needle changing machine, exquisite process settings, excellent quality control, high precision online monitoring system, online automatic calibration of grammage, thickness and width, which improves the dust removal At the same time, it overcomes the bad points produced by traditional equipment.

Yuanchen Technology, professional filter media production for 16 years, your trusted expert in comprehensive air environment management.

Source: Anhui Yuanchen Environmental Protection Technology Co., Ltd.

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