working principle

Air conveying chute A device that uses air flow to convey bulk materials along a pipeline. There are three types: suction type, pressure type, and mixed type. Its working principle is to use the kinetic energy of the air flow to make the bulk materials suspended and transported along the pipeline with the air flow:

① Suction type. After the exhaust fan is started, the entire system assumes a certain degree of vacuum. Under the effect of pressure difference, the air flow causes the material to enter the suction nozzle and be transported along the material delivery pipe to the separator at the discharge location. The material is separated from the air flow and discharged from the bottom of the separator. The air flow is purified by a dust collector and then discharged into the atmosphere through a muffler. The advantage is that the feeding is simple, and the material can be sucked from several places simultaneously. However, the conveying distance is short and the productivity is low. High sealing requirements.

② Press type. The blower presses air into the conveying pipe, and the material is supplied from the feeder. The mixture of air and material is pressed along the conveying pipe to the discharge point. The material is discharged after passing through the separator, and the air is purified by the dust collector before being discharged into the atmosphere. The characteristics are opposite to the suction type, which can transport materials to several places at the same time. The transportation distance is longer, the productivity is higher, but the structure is complex.

③ Hybrid. Is a combination of the above two forms.

Remind you: This device is not suitable for materials with large particle size, high moisture content, and poor fluidization!

influence factor

1. Air permeability of air hole plate. There are many materials for porous plates, such as porous ceramic plates, composite materials, etc., which can be selected according to specific circumstances.

2. Install the tilt angle. The optimal inclination angle for conveying fly ash by air conveying chute is 5 ° - 6 °.

3. Width of the air conveying chute body. The conveying capacity and width of the chute can be expressed by the following empirical formula: M=conveying capacity of the air conveying chute, kg/s, K=constant,=bulk density of the fly ash in the chute when fully fluidized, kg/, B=width of the chute, m.

4. Transportation gas consumption. The working pressure of fluidized air in the air conveying chute is generally 3.5-5Kpa, and the optimal air consumption is 2-3/㎡ · min, that is, 2-3 air consumption per minute per square meter of effective ventilation area of the orifice plate.

5. Moisture content of fly ash. Normally, the moisture content of fly ash is less than 1%. If the moisture content is high, it will affect the conveying efficiency and even cause blockage.

6. Initial velocity of fly ash. A certain initial speed is beneficial to chute transportation, especially for shorter chutes.

7. Conveying distance. For long-distance pneumatic conveying, corresponding air inlets must be added along the length of the chute to ensure uniform air flow into the chute and maintain the optimal fluidization of fly ash.

8. Control of fly ash feed quantity. Hongxin reminds that the air conveying chute must be fed evenly to avoid clogging of the chute due to excessive instantaneous feeding