Pneumatic conveying is a complex multiphase flow process. The movement of solid particles in the conveying pipe involves various conditions such as the distribution of air velocity and friction between the solid particles and the pipe wall. In the research of pneumatic conveying, the blockage of the pipelines of pneumatic conveying equipment is an important and complicated problem. If the pneumatic conveying system is not designed properly or the system deviates from normal operating conditions, blockage may occur during the conveying process. Sudden blockage will affect production than usual; in severe cases, it will cause the system to stop running, affect normal production and equipment safety, and cause economic losses.
At present, there is a lack of in-depth research on the mechanism of pipeline blockage prevention and control at home and abroad. The current system design, one is to use empirical methods, the price is to increase the operating cost; the other is not to take active measures to control the blockage. When the blockage occurs, in order to eliminate the blockage, the normal production is suspended and the gas is flushed to eliminate the blockage. There is also a method of halfway bleed gas to eliminate the blockage.
Compared with other conveying equipment, pneumatic conveying equipment takes up less space in the pipeline and has flexible wiring arrangements. As long as appropriate bends and pipelines are designed, the pipeline can be routed from above buildings or other obstacles. Material is conveyed through below, or bypassing them, and the conveying pipeline can be set at a high place in the space that does not affect other operations. Because flexible hoses and quick couplings can be used, it is easy to change the position of material import and export by manual control. Most pneumatic conveying devices can be controlled by the central control room, which greatly improves work efficiency and reduces costs.