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Filter Bag To Ensure The Stable Operation Of The Entire Equipment

Filter Bag as the heart of the bag filter, the effectiveness of the use of bag filter play a decisive role. In particular, the high temperature Filter Bag in the whole proportion of the value of a large number of dust collector to protect the Filter Bag to prevent damage due to various reasons, on the one hand, you can ensure that the filter effect to meet the emission concentration; the other hand, can reduce the economy Loss, to ensure the stable operation of the entire equipment.

First, the type of bag damage

1, mechanical damage

Mainly for the filter non-woven layer of grinding, off, this phenomenon is due to uneven distribution of air flow, dust in the high filter wind speed on the Filter Bag surface erosion caused; or because the Filter Bag is not in place, resulting in bag The friction between the broken; or injection pipe installation is not vertical, resulting in the mouth of 30-40 cm range of holes, loss of filtration performance.

(1) dust bag bag pocket parts

Filter Bag pocket parts damage more in the pocket down 30-40 cm within the performance of the bottom of the filter material blown, off off. Mostly for the compressed air is too high, the injection pipe skew, deformation of the board and other reasons, in the installation process to pay attention to the quality of installation.

(2) Filter Bag bag position

Filter Bag and skeleton contact part of the long-term due to pulse jet caused by contact part of the wear and tear, the performance of the vertical and horizontal tendons in the direction of wear traces. Pay attention to the size of the Filter Bag and skeleton with the surface of the dust skeleton finish.

3) The bottom of the bag is damaged

Filter Bag bottom phenomenon is more common wear and tear, may be due to the bottom of the bag cage is too small or bag is too long, bag cage can only make the bottom of the bottom of the bag. Filter Bag cleaning and filtration when the action is too large inside the bottom of the Filter Bag wear. Or dust accumulation is too high to form eddy current wear Filter Bag.

2, chemical corrosion

The most obvious manifestation of chemical corrosion is the sharp drop in the strength of the dust bag, which is manifested in acid corrosion, alkali corrosion, oxidative corrosion and hydrolytic corrosion, which results in loss of acceptable filtration load and loss of filtration performance. This phenomenon is mainly due to the selection of Filter Bags or use the conditions of the environment beyond the scope of the fiber, resulting in Filter Bag loss of performance and failure.

(1) acid corrosion

High temperature filter is generally acid corrosion, mainly sulfur oxide. Especially in the coal-fired boiler power plant flue gas dust, the use of high-sulfur coal, and electronic bag with the project, the sulfur content of flue gas is high, can reach 5000mg / Nm3. In high temperature environment, sulfur oxides to form sulfurous acid, sulfuric acid, the filter caused by acid corrosion and failure. If the flue gas contains HF, you can not use glass fiber filter, easy acid corrosion caused by filter failure.

General control of flue gas operating temperature above the acid dew point can be, such as below the acid dew point temperature must be closed dust collector system, to avoid corrosion Filter Bag. Acidic liquids are hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid and so on.

(2) alkali corrosion

Mostly in the sodium and ammonia chemical production process dust, such as sodium chloride, ammonia, sodium carbonate and other conditions. For the power plant, cement plants, waste incineration plant, steel and other areas of flue gas dust appear less.

(3) oxidative corrosion

Oxidation and corrosion refers to the existence of a certain amount of oxidizing substances when the damage caused by the filter, mainly for the PPS class of oxidative oxidation of the filter can cause damage to the PPS filter oxide nitrogen oxides, oxygen, ozone, Sulfuric acid and so on. The performance of the PPS fiber into a dark and brittle, the appearance of intact, but the sharp decline in strength, only about 200N, close to the end of the life of the filter, loss of filtering effect.

Film production is based on a rigorous production technology and manufactured separately from the latitude and longitude to stretch the PTFE microporous film. Use pressure and high temperature to fit the surface of different needle felt. When bonding to thermoplastic fibrous mats, we use special surface treatment techniques to treat the surface of the felt first and then with the PTFE film. Non-thermoplastic fibrous mats must be surface-treated, Teflon treated and then coated with PTFE. In addition, some special fibers need to be special chemical method for surface treatment, in order to achieve the strongest bonding effect.

The PTFE film has a pore size of from 0.1 to 3.5 m, and the microporous porosity is 75 to 90%. Such a high porosity of the pores is sufficient to allow a large amount of dense water vapor to pass freely, since the tiny water vapor molecules are free to diffuse and pass through the voids of the film. Because PTFE has excellent corrosion resistance to any chemicals, PTFE films can be used in a variety of chemical production processes.

Fiberglass film Filter Bag in the high temperature bag filter has been widely used, the effect is excellent, especially in large high-temperature bag filter on the application is more common. With this technology to produce glass fiber coated filter, dust removal efficiency, low running resistance, long life, no film off the phenomenon, you can work long-term conditions in 260oC (instantaneous temperature up to 300oC), filter All the performance of the bag without any change, the following 5um dust yield up to 100%, 1um below the dust collection efficiency of 99.5%. Filter Bag life of up to 2 years.

Fiberglass coated bag Advantages:

To achieve the surface filtration, dust emissions are almost zero, to meet the strict national emission standards.

The best dust cake off performance, improve the ventilation capacity of dust collection equipment, reduce the pressure drop of dust collection equipment.

Extend the life of the Filter Bag, reducing the cleaning cycle and electricity consumption, saving dust collection equipment maintenance costs.

Improve the dust filtration capacity of dust collection equipment, reduce and reduce the use of dust collection equipment and investment costs.


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