Study on the flow field characteristics of bulk grain pipeline based on gas-solid heterogeneous coupling

Abstract

AbstractThe swirling transport characteristics of grain particles in bulk grain pipeline after fluidization were studied. A spinning device was designed for the lateral filling pipe. The filling pipe was distributed uniformly along the circumference of the same section of the main pipe, the number was set to 3–7, and the included angles with the main pipe were 20°, 30°, and 40°, respectively. CFD-DEM was used to simulate the swirl transport of grain particles in a horizontal pipeline. The main multiphase inlet velocity was 20 m/s, and the gas velocity was 30 m/s in the side supplementary pipe. By comparing grain conveying speed, flow field pressure drop, and other indicators, it is concluded that when the number of filling pipes is 5, the spiral conveying distance is the longest, the conveying effect is good. By comparing the multiphase flow trajectory, it is concluded that the optimal spiral conveying effect is achieved when the angle between the side filling pipe and the main pipe is 30°. The experimental results show that the number of filling pipes is 5, and the conveying effect is the best when the angle between them and the main pipe is 30°, which is consistent with the simulation results

Keywords

• Dulk grain pipeline
• Lifting device
• CFD-DEM
• Number of trachea filling
• Angle