KNOWLEDGE

How to choose the best bag filter material

With the continuous improvement of ceramic technology, ceramic production has also entered the age of industrialization. But at the same time, we should also realize that in the process of the rapid development of the ceramic industry, a large number of polluting gases and various pollutants will also be generated. If there is no timely dust removal technology, it will inevitably affect the ceramic industry. In the process of the rapid development of the ceramic industry, the active selection of bag filters and optimization of the selection of filter materials can achieve clean production to a large extent.

1. The working principle of the bag filter

In the process of the rapid development of the ceramic industry, the content of pollutants produced by it is relatively huge, which to a large extent limits the long-term sustainable development of the ceramic industry. Therefore, in today's continuous development of the ceramics industry, the active use of bag filters for clean production has a key role. The bag filter relies on woven or felt filter cloth as the filter material to achieve the purpose of separating dust from dust-containing gas. Its working principle is: to capture the effects of screening, inertia, adhesion, diffusion, and static electricity generated when dust-containing gas passes through the filter cloth. Popular understanding is that a large amount of dust containing impurities is produced when ceramics are produced. Through the function of the bag filter, the pollutants can be intercepted as much as possible to reduce the emission of harmful gases. Of course, a bag filter is a technology-intensive tool. It has a very obvious "retaining" effect on pollutants and can separate harmful objects through its layer-by-layer action. Its main functions are shown in the following aspects:

(1) Screening function

The key function of the bag filter is similar to the common "sieve" in our lives. When an object passes through the filter in the sieve, if the diameter of the particles is smaller than the diameter of the filter cloth hole, the particles will be screened out. . On the contrary, if the diameter of the particles is larger than the diameter of the holes in the filter cloth, the particles will be "trapped" in the sieve. The screening effect of the bag filter is actually this principle. When the dust-containing gas passes through the filter cloth, the gap between the filter cloth fibers or the gap between the dust adsorbed on the surface of the filter cloth separates the dust larger than the gap diameter, which is called sieving. The size of the screening effect is directly related to the old and new filter cloth. If the filter cloth has just been put into use, the diameter of its network-shaped holes is often relatively large, so it is naturally difficult to play a "trap" effect. On the contrary, the longer the filter cloth is used, the longer the dust adheres to the network-shaped holes, the smaller the hole diameter, the more obvious the separation effect of the filter cloth. Of course, when the bag filter plays the role of screening, the key to its function is not the new or old filter cloth, but the material of the filter cloth.

(2) Inertia and diffusion

The two functions of the bag filter are also obvious for the separation of pollutants. It is precise because the filter cloth has such a function, or combined with the nature of the dust, can the leakage of polluted gas be minimized. The inertial effect, as the name implies, is a physical effect commonly recognized in physics. When a high-speed moving object suddenly encounters an interception, if it cannot break through the interception, it will be intercepted. In the dust removal operation, relying on the role of the filter grid, but when the polluted gas containing a large amount of dust rushes to the grid of the filter cloth, the gas is easily discharged, but the impurities contained in the gas or objects with larger particle diameters will be " Withhold". The inertial effect of the bag filter is directly related to the diameter of the particles. If the diameter of the particles is larger, the inertial effect is more obvious. The diffusion effect is the opposite of the inertia effect. When the particle size of the dust particles is less than 0.2um, because the dust particles are extremely small, Brownian motion such as the thermal motion of gas molecules will be generated, which increases the chance of contact between the dust and the surface of the filter cloth. The dust is captured.

(3) Adhesion and electrostatic effect

In the production process of the ceramics industry, when a large amount of dust gas is moving at a high speed, when passing through a relatively sealed filter cloth bag, the particles in the dust will adhere to the filter cloth bag. The larger the diameter of the particle, the gap between it and the filter cloth. The stronger the dependence. On the contrary, if the diameter of the particles is too small, the attachment effect will be less obvious. At the same time, when using a bag filter, it can also play a role in dust removal through its electrostatic effect. In the state of high-speed movement, there will be obvious collisions between different particles, and static electricity will be generated during the collision. However, this dust removal effect is directly related to the charge of the filter cloth, and the principle of "opposite attraction" must be followed. Therefore, the filter cloth should be selected scientifically based on the nature of the particulate matter when the bag filter is used for this dust removal function.

2. Filter material selection technology of bag filter in the ceramic industry

In the production process of the ceramic industry, the use of bag filters should pay attention to the selection of filter materials. Choosing scientific filter materials can effectively improve the dust removal effect, effectively play the role of separation, and maximize the promotion of clean production. In the process of selecting the filter material, scientific principles should be followed, and the filter cloth should be selected scientifically by fully combining the properties of the dust-containing gas, so as to effectively enhance the separation and adhesion of the dust-containing gas.

(1) Follow scientific principles

In the process of the rapid development of the ceramic industry, the active use of bag filters can achieve a good dust removal and environmental protection effect. However, the function of this bag filter requires the selection of scientific filter materials. If the filter material selection is not accurate enough, or the filter material selection is not scientific enough, it will affect the overall function of the bag filter. Therefore, in the selection of filter materials, scientific principles should be followed, and the corresponding filter materials should be selected according to the properties of gas dust. First of all, in the process of selecting filter media, the science and optimization of filter media performance should be ensured. Filter materials with different properties have differentiated effects. In the selection of filter materials, we must focus on their performance. Which filter material to choose depends on the nature of the gas and dust that may be generated during the ceramic production and processing, the size of the particles, and the way of dust removal. At the same time, in the selection of filter materials, the degree of pollution and hazard of gas dust should also be focused on, especially whether the gas dust has the possibility of an explosion, and the corresponding filter material selection should be made on the basis. Secondly, in the selection of filter material, it should also be based on its life cycle. If the filter material has a long service life, then on the basis of taking into account its performance, choose a filter material with long service life. Third, in the production and processing process of the ceramic industry, different gas dust need to be applied to the corresponding filter materials. Therefore, the selection of filter media cannot be simplified but should be combined with the properties of gas dust to choose diversified filter media as much as possible, so as to scientifically deploy and use it according to actual conditions.

(2) Combining the nature of dust gas

In the selection of filter materials of the bag filter in the ceramic industry, scientific selection should also be made based on the nature of the dust gas. First, select the filter material based on the temperature of the dust gas. The temperature of the dust gas corresponding to different filter materials is different. The temperature boundary of the latter is 130 degrees Celsius. If it is higher than this temperature value, then this type of dust gas is called high-temperature gas, if it is lower than this temperature value, Then this type of dust gas is called normal temperature gas. Considering that the temperature resistance of the filter material is significantly different, the selection of the filter material should be made according to its temperature value. If the filter material is resistant to high temperature, it should be selected when discharging high-temperature dust gas. If the filter material cannot be operated at a high temperature, it is used when discharging dust and gas at room temperature. Second, select the filter material in combination with the humidity of the dust gas. For some dust gas, its humidity value is relatively high. Then in the selection of filter material, you should choose a filter material with good water permeability and a smooth surface.

(3) Choose according to the dust removal method of the dust collector

In the ceramic industry production and processing process, the choice of scientific filter material should also be combined with the dust removal method of the dust collector. Different bag filters have different cleaning methods, such as vibration type, nozzle blowback type and so on. In the selection of filter materials, different soot blowing methods should be accurately selected. For example, the filter material of a vibrating dust collector should choose a filter material with a smooth surface to enhance the vibration effect. For example, when choosing the latter, you should choose a filter material with excellent structural properties.

In conclusion

In the production and processing process of the ceramics industry, in order to optimize environmental protection quality and achieve clean production, scientific filter materials should be selected. The selection of dust removal filter material is directly related to the dust removal effect of the bag filter in the ceramic industry. In the selection process, scientific principles should be followed, combined with scientific choices such as the temperature and nature of the dust gas and the dust removal method.

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