Look at design parameters. Generally, the filter wind speed of the bag filter is closely related to the dust concentration. When the dust concentration is ≤ 15g/m3, the filter wind speed should be 2m/min.
Bag filter is a dry filter device. Bag filter is also called bag filter. It is suitable for capturing fine, dry, non-fibrous dust. The dust bag filter bag is made of textile filter cloth or non-woven felt. It uses the filtering action of the fiber fabric to filter the dust-containing gas. When the dust-containing gas enters the bag filter, the particles have large and large dust. Due to the action of gravity, it settles down and falls into the ash hopper. When the gas containing fine dust passes through the filter, the dust is trapped and the gas is purified. The filter efficiency of general filters is 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 working principle of bag type dust collector bag dust collector: The filter type dust collector refers to the device that the dust particles in the air flow are intercepted and collected by the filter layer when the air hole of the dust-containing smoke passes through the filter layer, thereby realizing gas-solid separation.
Filter dust collectors include bag dust collectors and particle layer dust collectors. The former usually use filter bags made of organic fibers or inorganic fiber fabrics as filter layers, while the latter filter layers use particles of different particle sizes, such as quartz sand, River sand, ceramic particles, slag and other components.
Repeatedly attached to the outer surface of the filter bag with powder, the powder layer is continuously thickened, and the resistance value of the bag filter is also increased; the pulse valve diaphragm issues an instruction, and the pulse valve is opened when the left and right submerged, the compression within the high-pressure gas package. The air is open. If there is no dust or it is small enough, mechanical cleaning will stop working.
Belt dust collector construction:
The main structure of the bag filter is mainly composed of an upper box, a middle box, a lower box (ash bucket), a cleaning system and a 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.
Bag filter structure type:
1, according to the shape of the filter bag is divided into: flat bags (trapezoid and flat) and round bags (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 bag filtering method is divided into: external filter type and internal 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.