Complete Analysis of the Principle, Structure, Classification, Naming, and Maintenance Points of Bag Dust Removal
Category： Industry News
Publish time：2024-05-08
Recently, the country has attached increasing importance to environmental protection, and environmental protection technology has become particularly important. The outstanding advantage of bag filters is their high dust removal efficiency, which is generally greater than 99%. Therefore, they have become our main research object. Let's take a look with Xiao Qiyi below.
Dust collector classification
Working principle of bag filter
Bag filter is a type of dust collector, mainly used in some large production rooms, especially in factories with a lot of dust. In our daily lives, we rarely see it, but it plays an intuitive and important role in the quality of the ambient air. Generally, the filter material of a bag filter is a cloth or felt woven from synthetic fibers, natural fibers, or glass fibers.
Working mechanism
The working principle of a bag filter is to rely on woven or felt woven (pressed) filter cloth as the filtering material. When dusty gas passes through the filter bag, the dust is trapped on the surface of the filter bag, and dry air is discharged through the gaps between the fibers of the filter bag, thereby achieving the purpose of separating dusty gas and dust. Its working mechanism is the capture and collection of dust generated by screening, inertia, adhesion, diffusion, and static electricity when passing through the filter cloth.
1. Screening effect
When dusty gas passes through the filter cloth, the gaps between the filter cloth fibers or the gaps between the dust adsorbed on the surface of the filter cloth separate the dust larger than the diameter of the gaps, which is called screening effect. For the new filter cloth, due to the large gaps between the fibers, this effect is not significant and the dust removal efficiency is also low.
Only when a certain thickness of dust layer is established on the surface of the filter bag after a certain period of use, can the screening effect be more significant. After dust removal, due to a certain amount of dust remaining on the surface and inside of the filter bag, it can still maintain good dust removal efficiency.
For needle punched felt or plush filter cloth, as the felt or plush filter cloth itself forms a thick porous filter layer, it can fully exert the screening effect and not rely solely on the dust layer to maintain high dust removal efficiency.
2. Inertial action
When dusty gas passes through the filter cloth fibers, dust larger than 1 μ m still maintains a linear motion due to inertia and collides with the fibers, trapping them. The larger the diameter of dust particles, the greater the inertial effect. The higher the filtration gas velocity, the greater the inertia effect. However, if the gas velocity is too high, the amount of air passing through the filter cloth also increases, and the airflow will penetrate through the weak points of the filter cloth, causing a decrease in dust removal efficiency. The higher the gas velocity, the more severe the perforation phenomenon.
3. Diffusion effect
When the dust particles are below 0.2 μ m, due to the extremely small size of the dust, Brownian motion, such as the thermal motion of gas molecules, increases the chance of contact between the dust and the filter cloth, causing the dust to be trapped. This diffusion effect is opposite to inertia effect, increasing with the decrease of filtration gas velocity and enhancing with the decrease of dust particle size. Taking fiberglass as an example, the finer the fiber, the higher the dust removal efficiency (see table). But the pressure loss of fibers with a smaller diameter is greater than that of coarse fibers, and the corrosion resistance decreases as the diameter becomes finer.
Keywords： Complete Analysis of the Principle, Structure, Classification, Naming, and Maintenance Points of Bag Dust Removal
RELATED INFORMATION
Jiangxi Fuyun Environmental Protection Technology Co., Ltd. was established in 2002, jointly funded by Jiangxi Fushite Hydraulic Co., Ltd. and Jiangxi Copper Industry Group (Dexing) Industrial Co., Ltd. It is located in the economic and technological development zone of Shangrao, Jiangxi, which is known as the "thoroughfare of eight provinces". It is a young and mature, stable and dynamic environmental protection enterprise. The company has advanced production equipment and technology, and has been committed to the research and development, production, and sales of environmentally friendly products and equipment for many years. Capable of technical research and development. A comprehensive service model from engineering consulting, product design, project engineering contracting to after-sales service. Especially in the field of environmental protection filtration systems, our products are widely used in Jiangxi Copper and various metal smelting industries, covering various provinces, cities, and autonomous regions across the country, and have received widespread praise from customers.
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