Intelligent environmental protection conveying equipment pneumatic conveying system

Pneumatic conveying, also known as air flow conveying, is a specific application of fluidization technology that utilizes the energy of air flow to transport granular materials along the direction of air flow in a closed pipeline. The structure of the pneumatic conveying device is simple and easy to operate. It can be used for horizontal, vertical, or inclined conveying. During the conveying process, it can also perform physical operations such as heating, cooling, drying, and air flow classification, as well as certain chemical operations. Compared with mechanical conveying, this method consumes more energy, particles are easily damaged, and equipment is also susceptible to abrasion. Materials with high moisture content, adhesive properties, or prone to static electricity during high-speed movement are not suitable for pneumatic conveying.

pneumatic conveyingThe main characteristics are large conveying capacity, long conveying distance, and high conveying speed; It can be loaded in one place and unloaded in multiple places.

Intelligent environmental protection conveying equipment pneumatic conveying system

When conducting dilute phase transportation in a horizontal pipeline, the gas velocity should be high to disperse and suspend particles in the airflow. When the gas velocity decreases to a critical value, particles will begin to deposit in the lower part of the pipe wall. This critical gas velocity is called sedimentation velocity. This is the lower limit of gas velocity during dilute phase horizontal transportation. When the operating gas velocity is lower than this value, a deposition layer appears inside the tube, the cross-sectional area of the flow channel decreases, and the airflow above the deposition layer still runs at the deposition velocity.

When conducting upward pneumatic conveying in a vertical pipeline, particles are dispersed and suspended in the airflow at high gas velocities. When the particle transport volume is constant, reducing the gas velocity increases the solid content in the pipeline. When the gas velocity drops to a critical value, the airflow can no longer evenly disperse the dense particles, and the particles merge into a plunger shape, resulting in a surge phenomenon and a sharp increase in pressure drop. This critical velocity is called choking velocity, which is the lower limit of the gas velocity when the dilute phase is transported vertically upwards. For uniformly sized particles, the sedimentation rate is roughly equal to the choking rate. But for materials with a certain distribution of particle size, the sedimentation rate will be 2-6 times faster than the clogging rate.