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What are the types of air intake methods for bag filters? There are three types of air intake methods for bag filters: upper, middle, and lower. Different intake methods result in different airflow distribution of dusty gases entering the dust collector box. There is a certain relationship between the airflow distribution and the cleaning effect. High temperature filter bag
1. Upper intake
The upper intake method is also known as the upper intake type. Its air inlet is set at the upper part of the middle box body. In order to reduce the direct washing of the filter bag by dust containing airflow, a guide plate is installed at the corresponding part of the air inlet to the filter bag, allowing the dust containing gas to pass through the gaps of the filter bag and diffuse into the box body. If the pressure loss of the precipitator is limited to 120-150 mm water column, the Total pressure loss of the precipitator is about 15-30% lower than that of the lower air intake mode, because the dusty air flow is distributed from top to bottom after entering the box. When blowing and cleaning the filter bag, the dust settles into the dust collection box along the airflow direction, resulting in less suspended dust and therefore less dust being returned to the filter bag. That is to say, under the same injection conditions, better dust removal efficiency can be achieved, thereby reducing the pressure loss of the dust collector.
2. Middle intake
It is between the upper and lower air intake methods, and the air inlet is located at the lower part of the middle box and connected to the dust collection box. This form of air inlet is made by opening a rectangular opening along the length of the box and along the inclined wall of the dust collection box, which can avoid dust collection at the inlet. In addition, because the inlet area is large and the air inlet is equipped with a deflector, not only the pipes can be connected at the inlet at will, but also the wind speed is reduced, the local Friction loss is reduced, and the scouring of the filter bag by the dusty airflow is avoided. The phenomenon of cleaned dust returning to the filter bag has decreased.
3. Lower intake
The air inlet is located at the upper part of the dust collection box. The characteristic of this air intake method is that after the dusty gas enters the dust collection box, the speed suddenly decreases, causing larger particles of dust in the gas to settle and fall into the dust collection box, while the remaining fine powder is adsorbed on the filter bag as the airflow rises. Due to the airflow distribution being bottom-up. During the falling process of the dust that was swept off the filter bag, some of the fine particles had a settling velocity lower than the upward airflow velocity and were sucked back onto the filter bag, causing the resistance of the cleaned filter bag to quickly rise again. Under the same injection conditions, the equipment resistance is greater than that of the upper intake method. In order to ensure limited equipment resistance, it is necessary to increase the number of blows appropriately. The lower air intake method has the advantages of preventing the filter bag from being washed by dust containing airflow and facilitating pipeline connection. It is currently a commonly used air intake method
