328 / 2024-03-15 18:05:48

Effect of Particle Characteristics on Pneumatic Conveying of Gravel by Swirling Flow

CFD-DEM; pneumatic conveying; fluid-structure coulping; gravel fluidization; particle accumulation; swirling generator

1、资源开发与利用 > 3、煤炭低碳化开发与利用

In the process of swirling pneumatic conveying, there is vortex attenuation. To maintain the suspended conveying state of particles, it is necessary to supplement the vortex when it is about to settle, called secondary swirling. This article quantitatively describes the shape characteristics of gravel through sphericity, and based on CFD-DEM coupled numerical simulation, with the help of range analysis and variance analysis of orthogonal experiments, studies the effects of particle parameters such as gravel size, gravel velocity during secondary rotation, and gravel sphericity on three indicators: particle picking ratio, static pressure drop of pneumatic conveying system, and particle accumulation quality in cyclone tube under secondary rotation conditions. The ranking of the impact of various factors on the evaluation indicators is size>sphericity>velocity, size> velocity> sphericity, and velocity>size> sphericity. The impact of gravel size and speed on the three evaluation indicators is significant. Sphericity only significantly impacts the proportion of particle pickup, and there is a non-linear relationship between the two. To increase the proportion of picked-up particles, reduce energy loss, and reduce the number of particle wall collisions, it is necessary to maintain that the particle velocity cannot return to zero before the second rotation, and the optimal value is 3m/s.