Bag dust collector is a common dust removal equipment, widely used in chemical production, then what is the main reason for the impact of dust collector? What is the trend of its future development!

The future development trend of bag filter in cement industry is broad

With the Environmental Protection Bureau on the progress of environmental pollution emission standards, as long as the bag dust collector to reach the requirements, so the future trend of bag dust collector is very broad!

The characteristics of bag filter

1. The dust removal power of fine dust is high, generally up to 99 or more, and can be used in occasions with high purification requirements.

2. Habitual, can capture all kinds of nature of dust, and does not affect the dust removal power due to the specific resistance of dust and other properties, the habit of smoke concentration scale, and when the import concentration or smoke quality changes, it will not affect the purification power and operation resistance.

3. Standardized diversity, the use of sensitive. The air volume can be from several hundred to several million cubic meters per hour.

4. Easy to recover materials, no pollution, waste water and other secondary pollution.

5 by the filter material temperature resistance, corrosion resistance and other functions of the constraints, the use of temperature can not be too high, some corrosive gases can not be selected.

6. When collecting dust with strong viscosity and hygroscopicity or dealing with flue gas with high dew point, the filter bag is simply blocked and normal operation is affected.

7. The existence of different degrees of bag type dust collector covers a large area, the filter bag is easy to damage, repair costs.

Application of bag filter

Along with the development of bag type dust removal skills and environmental requirements of the increasing progress, the use of bag type dust collector is more and more extensive, now can use bag type dust collector to deal with high temperature, high humidity, bonding, blasting, abrasive flue gas, and even filter air containing ultrafine dust.

1. High temperature and high humidity gas

All kinds of industrial kilns, dryers and other flue gas are attributed to high temperature flue gas, most of which also contains a lot of water and sulfur oxide gas. Bag filter is now able to deal with the temperature of 300 DEG C below the flue gas, beyond this temperature to deal with flue gas pre-cooling treatment, in special circumstances, the use of metal fiber filter material directly deal with 450~550 ℃ high temperature flue gas.

The use of bag filter to deal with the flue gas of steam boilers, cement kilns, metallurgical furnaces, incinerators and other high-temperature kilns is increasingly widespread at home and abroad. Although the bag filter is constrained by the temperature-resistant function of its filter material, it can handle high-temperature flue gas with a temperature of up to 1200~1400 ℃ after proper treatment of the flue gas system.

2. Cohesive dust

The binding dust is simply hardened on the surface of the filter bag, and the bag filter can deal with the binding dust through the adsorption effect, that is, the appropriate amount of porous powder is mixed into the system pipeline, the powder is used to adsorb the binding dust, and then the bag filter is purified. For example, the refractory plant uses dolomite powder to adsorb and purify asphalt fumes, the aluminum plant uses alumina to adsorb asphalt and hydrogen oxide, and the asphalt concrete workshop of Lutu Company uses limestone powder to adsorb asphalt fumes, and its adsorption power can reach 92~99.

3. Explosive dust

Blasting will occur only when explosive dust has the following three conditions:

(1) Combustible substances are present in the flue gas at an appropriate concentration;

(2) sufficient oxygen and oxidant;

(3) There is a fire source.

Therefore, when purifying this kind of gas, it should adopt the method of damaging the above three conditions or the onset of a certain condition.

Simply put, it is to control ingredients and eliminate kindling. Eliminate static electricity and ground equipment; Monitor explosion-proof, save life and vent explosion.

4. Corrosive gas

In the flue gas purification system, the bag filter has a corrosive impact on the main gas and dust two media, such as coal, heavy oil combustion guess due to the presence of sulfur molecules and the composition of sulfuric acid gas, may encounter water will attack a variety of salt dust.

At the moment, the following anti-corrosion measures should be adopted in the use of bag filter:

Because the corrosion phenomenon in flue gas purification occurs when the flue gas temperature is below the acid dew point, the flue gas system should be guaranteed to operate above the dew point temperature.

In the selection of filter materials, the corresponding filter materials should be selected according to the characteristics of corrosive substances in flue gas. For the purification system with severe corrosion and high requirements, such as pharmaceuticals, food, carbon black production and other occupations, the important parts of bag filter should be made of stainless steel or painted with anti-corrosion coating.

5. Grinding pecking dust

When dealing with grinding and pecking dust such as alumina, silica and sinter, the coarse particles in the smoke and the air flow move at too high speed in the bag filter, resulting in intense wear on the filter bag and shell of the filter. Therefore, corresponding measures should be adopted from two aspects of reducing the amount of coarse particles in the flue gas and reducing the flow rate of dust-containing gas, such as setting up pre-dust removal equipment before the flue gas enters the bag filter, strictly control the flow rate of the filter bag inlet, and add wear-resistant materials at the air inlet where it is easy to grind.

The cement industry is a pillar industry in China, which has made great contributions to the construction of our country. However, the pollution caused by its dust emission to the environment is particularly severe. If the dust is not managed, the total dust emission during the cement production process will exceed about 5 of the total output. The lost dust is all products of cement and products in each production link, and its economic loss is considerable.

On November 4, 1998, the General Administration of Environmental Protection issued the "Notice on Printing and Distributing the Qualified Discharge Plan of Industrial Pollution Sources and the Qualified Operation Plan of Urban Environmental Function Areas of Key Points of Environmental Protection in 2000" issued by the General Administration of Environmental Protection in the form of Huanfa [1998] No. 366 "Emission Standards for the Arrival of Pollutants from All Industrial Pollution Sources or Local Regulations; Ambient air and aboveground water environment in municipalities directly under the municipalities, provincial capitals, special economic zone cities, according to the function of the different rules of arrival of the relevant quality specifications (referred to as" double qualified ").

The cement industry, a major polluter of industrial enterprises, has made a series of useful measures to manage its dust pollution in order to get used to the strict requirements of environmental protection at that time.

In recent years, the cement industry has invested a lot of financial and material resources to manage dust, but it still fails to achieve the expected results. One of the important reasons is that the skills are still backward and the loss outweighs the gain. Many bag dust removal equipment used in the cement industry still have many unreasonable factors in the selection and application.

As a kind of dust removal equipment, bag filter has been widely used in various production links of cement industry. With the continuous progress of cement production technology, many production links can only use bag filter to meet the production needs and satisfactory emission requirements. In other words, the bag filter in the cement industry is not only environmental protection equipment, but also production equipment.

The main reason why the dust bag affects the dust removal of the dust collector

Dust collector is a modern family often use equipment, and the dust collector is convenient and quick to operate, so it is deeply loved by people. The dust collector has indeed brought a lot of help to our day, it has built a cleaner day environment for us. Dust collector can be useful for dust removal, but sometimes there are many problems, so how to deal with these problems?

It is difficult to analyze the power with an isolated dust collection mechanism model. It is a more reasonable way to analyze the effects of the same effect in series, which is called inductive filtering power method.

The primary factor affecting the dust collector: the concept of dust is important, and the importance is reflected in the dust removal power of the dust collector. The filter power of the bag filter is an inductive power, the concave and convex of the power depends primarily on the filter material, and the traveling power depends on the secondary dust layer.

Generally speaking, the dust removal power of plain weave fabric filter material itself is above 85~90, and the power is relatively low. After serving as the secondary dust on the surface of the filter cloth, the dust removal power will travel to above 99.5. This is precisely because the void of the filter material fiber formed by the dust layer is much smaller, which strengthens the screening effect of the dust layer on the dust. The power of the dust collector also travels.

In fact, the effect of cleaning ash is directly manifested in the cleaning of the secondary dust layer and the preservation of the primary dust layer. This should be the benchmark for us to adjust the injection system. But the influence of the amount of dust in the secondary dust layer, the filtering wind speed, the filtering resistance, the cleaning time and the strength, the selection of it is an instant and long time stable filtering condition.