How to use the filter bag (filter bag specification):
Filter closed filter: The filter bag and the matching filter are used at the same time. The system fluid pressure is used to squeeze the liquid through the filter bag to achieve the purpose of filtration. With the advantages of high flow rate, large processing capacity and long service life of filter bags, it is especially suitable for occasions where large flow rates need to be sealed.
Self-flowing open filtration: The filter bag is connected directly to the pipe through a suitable fitting and is filtered with a fluid gravity differential pressure. Its remarkable feature is that it does not require equipment investment, and filtration is simple and feasible. It is particularly suitable for small-size, multi-species, and intermittent economical liquid filtration.
Bag filter is a dry filter device. It is suitable for capturing fine, dry, non-fibrous dust. The filter bag is made of textile filter cloth or non-woven felt, and the dust-containing gas is filtered by the filter effect of the fiber fabric. When the dust-containing gas enters the bag filter, the particles have large and significant dust due to gravity. The action settles down and falls into the ash hopper. When the gas containing fine dust passes through the filter, the dust is retained and the gas is purified. The dedusting efficiency of a new filter is generally not high enough. After the filter material is used for a period of time, due to the effects of screening, collision, retention, diffusion, and static electricity, the surface of the filter bag gathers a layer of dust. This layer of dust is called the primary layer. After this, the initial layer becomes The main filter layer of the filter, relying on the role of the initial layer, the filter material with larger mesh can also obtain higher filtration efficiency. With the accumulation of dust on the surface of the filter material, the efficiency and resistance of the dust collector are correspondingly increased. When the pressure difference between the two sides of the filter material is large, some fine dust particles that have adhered to the filter material will be squeezed. Reduce the efficiency of the dust collector. In addition, the high dust resistance of the dust remover will significantly reduce the air volume of the dust removal system. Therefore, after the resistance of the dust collector reaches a certain value, it is necessary to clear the dust promptly. The primary layer cannot be destroyed during cleaning so as not to reduce the efficiency.
The structure of the bag filter is mainly composed of the upper box, the middle box, the lower box (ash bucket), the cleaning system and the ash discharging mechanism.
In addition to the correct selection of filter bag material, the dust removal system plays a decisive role in the bag filter. For this reason, the cleaning method is one of the characteristics of the bag filter, and is also an important part of the operation of the bag filter.
Filter bag (filter bag specifications) classification:
1. According to the shape of the cross section of the filter bag, it can be divided into: flat bag (trapezoid and flat) and round bag (cylindrical).
2. According to the way of entering and exiting the wind, it can be divided into: the downward air inlet, the upper air outlet, the outlet air outlet and the direct current type (only for flat flat bags).
3, according to the filtering method of filter bag is divided into: outer filter type and inner filter type.
Fibers for filter media include cotton fibers, wool fibers, synthetic fibers, and glass fibers. Filter media made of different fibers have different properties. Commonly used filter material is 208 or 901 polyester wheel fabric, the use temperature is generally not more than 120 °C, after silica gel resin treated glass fiber filter bag, the use temperature is generally not more than 250 °C, cotton wool fabric is generally suitable for non-corrosive; temperature Dust-laden gas below 80-90°C.