Design of Air Inlet for Dust Collector (Part 1)

1. Design of ash hopper air inlet

(1) The ash hopper air intake is the most commonly used air intake method for bag filters. Usually, the dust laden airflow of bag filters for reverse blowing, vibration cleaning, and pulse cleaning is introduced from the bottom of the filter bag ash hopper. The main characteristics of ash hopper air intake are: ① simple structure; ② The large capacity of the ash hopper can disperse the high-speed airflow entering, causing large particles of dust to settle inside the hopper and play a role in pre dust removal; ③The ash hopper has a large volume, and it is possible to install an airflow distribution device to reduce the deviation of incoming airflow.

(2) Ash hopper air inlet guide plate

There are currently three main forms of ash hopper guide plate: ① Grid deflectors (see Figure 3-11), mainly consisting of baffles added to the air inlet or composed of louvers;  ② The trapezoidal guide plate (see Figure 3-12) plays a role in changing the direction of the airflow and making the flow field evenly distributed inside the dust collector;  ③ The inclined guide plate (see Figure 3-13) not only changes the direction of the airflow and makes the flow field evenly distributed, but also provides a buffer for the upward process of the airflow.