文章来源： 作者：罗茨机电 发布时间：2022-05-17 浏览次数：425
What are the structural characteristics of pneumatic conveying device?
The pneumatic conveying device has the advantages of simple structure and convenient operation. It can be used for horizontal, vertical or inclined conveying. In the conveying process, it can also carry out physical operations or some chemical operations such as material heating, cooling, drying and air flow classification at the same time. Compared with mechanical conveying, this method * consumes a lot, the particles are easy to be damaged, and the equipment is also easy to be abraded. Materials with high water content, adhesion or easy to generate static electricity during high-speed movement are not suitable for pneumatic conveying.
When the dilute phase is transported in the horizontal pipeline, the gas velocity should be high to disperse and suspend the particles in the gas flow. When the gas velocity decreases to a certain critical value, the particles will begin to deposit in the lower part of the pipe wall. This critical gas velocity is called deposition velocity. This is the lower limit of gas velocity in dilute phase horizontal transportation. When the operating gas velocity is lower than this value, there is a deposition layer in the pipe, the cross-section of the channel decreases, and the air flow above the deposition layer still runs according to the deposition velocity.
Upward pneumatic conveying is carried out in a vertical pipe. When the gas velocity is high, the particles are dispersed and suspended in the air flow. When the particle conveying volume is constant, reduce the gas velocity, and the solid content in the pipeline becomes higher. When the gas velocity decreases to a certain critical value, the air flow can no longer make the dense particles disperse evenly, the particles converge into a plunger shape, there is a surge phenomenon (see fluidization), and the pressure drop increases sharply. This critical speed is called choking speed, which is the lower limit of gas velocity when dilute phase is transported vertically upward. For particles with uniform particle size, the deposition velocity is roughly equal to the choking velocity. However, for materials with certain particle size distribution, the deposition rate will be 2 ~ 6 times that of choking.
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