Pneumatic conveying is a complicated multiphase flow process. The movement of solid particles in the conveying pipe involves the distribution of airflow velocity and the conditions of solid particle and pipe wall friction.
The movement state of the solid particles in the conveying pipe has both rolling and suspension. At the same time, collisions occur between the solid particles and the solid particles, the solid particles and the wall surface, and the rotation of the solid particles also generates the lifting force. It is quite complicated to fully consider these problems. For a long time, people have conducted a lot of research in this field, but there are still many problems that have not been well resolved. For example, solid particles interact with each other and between solid particles and the wall of a pipe as the bulk material is carried away by the airflow in the pipe. As a result of the collision, the collision results in the crushing of the solid particles and the wear of the pipe, which becomes more pronounced at high speeds.
In order to reduce these phenomena, the speed of the air flow can be reduced, but then it is easy to cause flow instability, it is to clog. In addition, the transmission efficiency of the system is also an important issue. The size, hardness, and ability of damage to Conglong, as well as the inherent enthusiasm of viscous wins and delivery systems, are constrained by each other, and together determine the efficiency of pneumatic conveying. Considering the transmission effect from a comprehensive perspective becomes very complicated. The gas-solid two-phase flow in the system directly affects the stable and efficient operation of the system. Therefore, to optimize the design of the pneumatic conveying system, it is necessary to grasp the system operation time. The characteristics and laws of gas-solid two-phase flow must be studied in-depth on the flow of solid particles in the pipeline.
In the study of pneumatic conveying, the blockage of pipelines for pneumatic conveying equipment is an important and complicated problem. If the design of the pneumatic conveying system is unreasonable or the system deviates from normal operating conditions, jamming may occur during the conveying process. Sudden congestion will affect normal production; if it is serious, it will cause the system to stop operating, affect normal production and equipment safety, and cause economic losses. At present, there is still a lack of in-depth study on the mechanism of blockage and the prevention and control of plugging at home and abroad. The current system design, first, adopts an empirical and trial-and-error approach, at the cost of increasing operating costs; second, it cannot use active measures to control congestion. When the blockage occurs, in order to eliminate the blockage, the normal production is suspended, and the air is used to eliminate the plugging. The method of terminating the air and eliminating the plugging is also adopted. However, the operation is complicated and the cost is also increased.
In order to better solve the problem of blockage, in the production process, to make active efforts to prevent and prevent the occurrence of blockage, it is necessary to understand the different conditions (air flow, load ratio, etc.) in the pneumatic conveying system. The state of the gas-solid two-phase flow shows the relationship between operating conditions and solids flow, so as to identify the causes and mechanisms of the blockage, and propose control measures to achieve the aim of actively controlling the resorts, thereby increasing the System operation reliability, save energy.
The movement state of the solid particles in the conveying pipe has both rolling and suspension. At the same time, collisions occur between the solid particles and the solid particles, the solid particles and the wall surface, and the rotation of the solid particles also generates the lifting force. It is quite complicated to fully consider these problems. For a long time, people have conducted a lot of research in this field, but there are still many problems that have not been well resolved. For example, solid particles interact with each other and between solid particles and the wall of a pipe as the bulk material is carried away by the airflow in the pipe. As a result of the collision, the collision results in the crushing of the solid particles and the wear of the pipe, which becomes more pronounced at high speeds.
In order to reduce these phenomena, the speed of the air flow can be reduced, but then it is easy to cause flow instability, it is to clog. In addition, the transmission efficiency of the system is also an important issue. The size, hardness, and ability of damage to Conglong, as well as the inherent enthusiasm of viscous wins and delivery systems, are constrained by each other, and together determine the efficiency of pneumatic conveying. Considering the transmission effect from a comprehensive perspective becomes very complicated. The gas-solid two-phase flow in the system directly affects the stable and efficient operation of the system. Therefore, to optimize the design of the pneumatic conveying system, it is necessary to grasp the system operation time. The characteristics and laws of gas-solid two-phase flow must be studied in-depth on the flow of solid particles in the pipeline.
In the study of pneumatic conveying, the blockage of pipelines for pneumatic conveying equipment is an important and complicated problem. If the design of the pneumatic conveying system is unreasonable or the system deviates from normal operating conditions, jamming may occur during the conveying process. Sudden congestion will affect normal production; if it is serious, it will cause the system to stop operating, affect normal production and equipment safety, and cause economic losses. At present, there is still a lack of in-depth study on the mechanism of blockage and the prevention and control of plugging at home and abroad. The current system design, first, adopts an empirical and trial-and-error approach, at the cost of increasing operating costs; second, it cannot use active measures to control congestion. When the blockage occurs, in order to eliminate the blockage, the normal production is suspended, and the air is used to eliminate the plugging. The method of terminating the air and eliminating the plugging is also adopted. However, the operation is complicated and the cost is also increased.
In order to better solve the problem of blockage, in the production process, to make active efforts to prevent and prevent the occurrence of blockage, it is necessary to understand the different conditions (air flow, load ratio, etc.) in the pneumatic conveying system. The state of the gas-solid two-phase flow shows the relationship between operating conditions and solids flow, so as to identify the causes and mechanisms of the blockage, and propose control measures to achieve the aim of actively controlling the resorts, thereby increasing the System operation reliability, save energy.
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