Which gases can cause corrosion of dust bags

Elements that form the damage of the dust bag:

1. Incineration: The elements that form the incineration of the dust collector cloth bag are first of all the initial layer thickness of the dust removal bag and the temperature of the flue gas is too high. If the flue gas temperature processed by the dust collector for a long time exceeds the operating conditions of the bag, the dust bag will be hardened and shortened, or the hole will be abled.

If the initial layer thickness is not good, the sparks in the flue gas will flow in, or the dust will heat up, which may also cause the dust bag to burn holes. The incineration of the dust bag is mainly reflected in the new replacement of the dust bag. Due to the fact that the ash is not pre-coated after replacement, the high-temperature flue gas directly touches the cloth bag with sparks, which is easy to burn the dust removal bag.

Avoid incineration: Ensure the initial layer thickness of the dust bag surface. Ensure that the exhaust gas temperature is not overheated (the control specification of furnaces 3 and 4 is not higher than 180).

2. Abrasion: Wear dust removal bags mainly occur in the middle of the dust collector, and on a single dust removal bag, they mainly occur within 1 meter of the bag from the outlet. The primary element is the uneven distribution of flue gas, the flow rate in the middle of the single chamber is too high, and the outlet is on a single dust bag.

The filtration gas velocity at the place is too high, resulting in dust impact, wear and tear cloth bag, also make the fabric fiber tension of dust removal bag damaged, simple part of the cloth bag perforated, the use cycle is too short. Dust bags for frequently worn areas are replaced with abrasion-resistant bags.

3. Too high filtration gas speed will break the initial dust layer, and the dust will impact the bag and form excessive wear, if the number of cleaning bags is too high at the moment, it is very easy to cause the fabric of the bag to loosen, and accelerate the wear of the bag. The dust content in the flue gas exceeds the design specifications, which will also accelerate the wear of the bag. The small ash hopper accumulates too much dust, which causes excessive dust content in the flue gas chamber and accelerates the wear of the cloth bag.

4. The distance between the dust bags is too small, and the keel is tortuous, etc., which simply form the wear between the bags. The difference between the diameter of the cloth bag and the keel, too small cleaning effect is not safe, will form a shortening of the cleaning cycle and the pressure of improving the air jet, when the bag and the keel conflict will accelerate the wear. Special attention should be paid to some filter cloths that change greatly with temperature and have elongation characteristics.

5. When there are holes or burrs in the keel welding, or the rough appearance due to corrosion, it will also accelerate the wear of the bag. If the bag and the perforated plate are not tightly sealed, the top of the bag will be worn.

6. The venturi tube or pulse tube is not properly aligned with the cloth bag, which simply makes the air flow from the blowing pipe directly wash the upper part of the cloth bag and wear. If the bag is cleaned too often, it will accelerate the wear and tear of the bag.

When the bag filter is used to purify the flue gas, the moisture, acid gas and chemicals in the flue gas will corrode the indoor metal parts, resulting in corrosion, oxidation or rust on the indoor metal surface. These corrosion phenomena can damage the structure and performance of the dust collector, reducing the life of the dust collector.

Specifically, moisture and acid gases in flue gases are the main factors that lead to metal corrosion in the room. Moisture will cause the surface of indoor metal parts to starve and form a water film, thereby promoting the occurrence of metal corrosion. Acid gases can directly corrode metal surfaces, including filter bags, skeletons, solenoid valves, blow pipes and other components of dust collectors.

In order to alleviate these problems of decay and land erosion, the following measures can be taken:

Corrosion-resistant materials, such as stainless steel, ceramics, etc., are used to manufacture dust collector components.

Before the flue gas enters the dust collector, pretreatment equipment, such as desulfurization, desalination, etc., is used to reduce the acid content in the flue gas.

Perform regular cleaning and maintenance of the dust collector, including removing dirt and fouling from the surface of components such as filter bags and blow pipes.

During the operation of the dust collector, the corrosion on the surface of the metal parts is checked regularly, and maintenance and replacement are carried out in time.

Through the above measures, the degree of indoor metal corrosion can be reduced and the service life of the dust collector can be prolonged.

If it is a more corrosive dust condition, it is recommended to choose a dust bag material with strong corrosion resistance, which is generally a high-temperature dust bag The common ones are mainly the following types:

High temperature dust removal cloth bag.

1. P84 needle felt.

Gram weight: 500

Thickness: Operating temperature: 260

Instantaneous temperature: 280

Acid Resistance: Excellent.

Alkali resistance: medium.

It is suitable for coal-fired boilers, liquid bed boilers, waste incineration, asphalt plants, cement plants, waste incinerators, etc.

Weight: 800

Thickness: Operating temperature: 280

Instant temperature: 300

Acid Resistance: Good.

Alkali resistance: Good.

It is suitable for steel, smelting, ferroalloy, chemical industry, cement, calcium carbide, waste incineration, electric power, asphalt mixing, etc.

3. Metas.

Gram weight: 500

Thickness: Operating temperature: 204

Instant temperature: 250

Acid Resistance: Medium.

Alkali resistance: medium.

It is suitable for asphalt, cement, steel, non-ferrous metals, lime, dust, metallurgy, plastics, carbon black, coke, tobacco and other industries.

4. Glass fiber needle felt.

Gram weight: 1000

Thickness: Operating temperature: 280

Instant temperature: 300

Acid Resistance: Excellent.

Alkali resistance: excellent.

It is suitable for dust removal bags in high-temperature flue gas industries such as steel, metallurgy, carbon black, power generation, cement, chemical industry, etc.

Hello landlord.

Is your baghouse corroded inside or outside. Better give me a ** to see.

Internal corrosion: It is a corrosive gas in the dust. It is necessary to treat the exhaust gas first, and then filter the dust after the exhaust gas is treated.

External corrosion: The serious external corrosion is that the anti-corrosion on the steel plate or galvanized sheet is not good enough. This requires the surface to be treated with a paint finish. The corroded area is sanded clean, and then the anticorrosive paint is completely repainted. (Anticorrosive paint needs to be brushed several times).

Mechanical damage, chemical corrosion, high temperature burning, filter bags, dust removal bag condensation.

There are many reasons for the poor working effect of the bag filter, such as the ash cleaning system is not well designed, the operation procedures are not followed when used, etc., any of these details may cause the dust removal effect of the bag filter to deteriorate. Therefore, enterprises must pay attention to the purchase and use of bag filters.

When purchasing a bag filter, the enterprise must provide the actual working conditions such as the temperature and corrosivity of the flue gas to the bag filter manufacturer in detail, and the dust collector used under different working conditions is different in the structure and the use of accessories. It is not possible to choose a set of dust collection equipment that is not suitable just for the pursuit of cost reduction. When accepting the bag filter, it must be tested in strict accordance with the relevant national standards, because the working effect of the bag filter will also be affected by the production process of some dust removal accessories, such as the quality of the accessories is not good, the box and the ash hopper are not sewn well, there may be air leakage and affect the dust removal effect.

If the dust removal effect of the bag filter is not up to standard during use, it must be checked one by one according to the following suggestions:

1. Check whether there is a broken bag, or the dust bag has reached the service life.

2. There is a problem with the injection system (pulse valve, cylinder, electric control cabinet).

3. The flue gas conditions change, such as the increase of water content in the flue gas, the increase of the flue gas volume, etc.

Finally, when operating the bag filter, it must be carried out in accordance with the operating procedures provided by the supplier, as illegal operations may damage some accessories and lead to unsatisfactory dust removal results of the bag filter.

The bag filter should have a good working effect, which is the result of a comprehensive effect, and in the production process, any link is not paid attention to, which will affect the quality of the bag filter. Therefore, Hebei Cangheng dust removal equipment has always paid great attention to the training of employees on the production line, so that they can produce dust removal equipment that meets the requirements of major enterprises with quality and quantity.

With the long-term use of the bag filter, some bag filters will leak air, which leads to many reasons for the leakage of the bag filter, and the customer must repair it in time so as not to affect the work.

1. The diaphragm of the bag filter is damaged.

Close the valve in front of the pulse valve manifold bag, open the pulse valve for inspection, and if the diaphragm is damaged, it must be replaced.

2. For the bag filter, if there is a loophole in the blowing pipe in the air bag, it will cause the compressed air to enter the blowing pipe directly without passing through the valve and leak.

Timely repair or replacement of the blowpipe can eliminate air leaks.

3. There are rust, welding slag and other sundries between the gasket of the diaphragm and the end face of the air outlet, and the two cannot be sealed, resulting in air leakage of the bag dust collector.

The flush valve must be opened to remove debris. In addition, in the process of installing the bag filter, the compressed air pipeline is ventilated and purged to remove rust, welding slag and other debris, and then the flushing valve and air distribution bag are installed, which can effectively avoid air leakage caused by debris blockage.