文章來源： 作者：羅茨機電 發布時間：2022-01-21 瀏覽次數：485
The existing pneumatic conveying of powder can be divided into two categories:
(1) Dilute phase pneumatic conveying
The wind speed is high, the material suspension is evenly distributed in the vertical pipe, flying in the horizontal pipe, and the porosity is large. The transportation of materials mainly depends on the kinetic energy formed by the air with high speed, so it is also called dilute phase dynamic pressure transportation
Features: due to large material flow, small mass flow and serious collision and friction between particles and pipeline, the conveying system has high energy consumption, large wear and low production efficiency. It is suitable for conveying materials with small quality, small particle size and strong fluidity
(2) Dense phase pneumatic conveying
The wind speed is between 8 and 15ms. The material is no longer evenly distributed in the pipeline, but in a dense state, but the pipeline is not blocked by the material, so it still depends on the kinetic energy of air, which is called dense phase dynamic pressure transportation
The gas conveying device has high-pressure conveying, high vacuum suction conveying and fluidization conveying. The ratio of substance to gas varies greatly. The feed gas ratio of high pressure and high vacuum suction is about 15 ~ 50, and the flow state is pulsating group flow. For powder that is easy to transport, the material gas ratio can be up to more than 200, which is fluidized
Mixed powder conveying system
The mixed conveying system has both positive pressure and negative pressure in the same conveying system. Using the advantages of two different systems, it can be applied to more complex transportation. The mixing system can be pressurized feeding or negative pressure suction.
Characteristics of combined conveying system: it can complete long-distance conveying, and the pipeline structure and air flow change are complex. At the same time, it is also easy to cause wear of the conveying system, especially the fan.
1 - suction nozzle 2 - conveying pipe 3 - separator 4 - dust collector 5 - negative pressure fan
Suction pneumatic conveying device
Features: the negative pressure conveying system is an ideal system. Because the pressure in the conveying pipeline is lower than the atmospheric pressure, there is no problem of gas leakage in the pipeline, so it is more suitable for conveying toxic and harmful substances.
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