Prediction of Horizontal Pneumatic Conveying of Large Coal Particles Using Discrete Phase Model

Daolong Yang,Jianping Li,Youtao Xia,Qingkai Wang,Ge Li,Qianqian Huang,Qian Li,Yanxiang Wang

doi:10.1155/2020/1967052

Abstract

The pneumatic conveying focusing on gas-solid two-phase flow plays an important role in a conveying system. Previous work has been conducted in the fields of small particles, where the size was less than 5 mm; however, there are few studies regarding large sizes (>5 mm). In order to predict the horizontal pneumatic conveying of large coal particles, the coupling methods based on the Euler–Lagrange approach and discrete phase model (DPM) have been used for the simulated research. Compared with the experimental results under the same working condition, the particle trajectory obtained by simulation is similar to the particle distribution at the same position in the experiment, and it turns out that the simulation method is feasible for the horizontal pneumatic conveying of large particles. Multifactor simulations are also carried out to analyse the effects of particle size, flow field velocity, solid-gas rate, and pipe diameter on the wall abrasion during horizontal pneumatic conveying, which provides simulation reference and design guide for pneumatic conveying of large particles.

Highlights

For a long time, research on fluid flow containing particles has become important in engineering [1,2,3,4]. e pneumatic conveying focusing on gas-solid two-phase flow plays an important role in a conveying system
Particle Trajectories. e part of the particle trajectories in the horizontal pipe is shown in Figure 6. e solidgas rate in the simulation is 10. e particle size is different in Figures 6(a) and 6(b), the flow field velocity is different in Figures 6(a) and 6(c), and the pipe diameter is different in Figures 6(a) and 6(d)
Comparing the simulation and experiment results of the pressure drop, the pressure drop obtained by simulation and experiment varies greatly with the flow field velocity. is is because the discrete phase model (DPM) used in this paper does not consider the particle shape characteristics. e particle shape characteristics play a key role in the particle-particle and particle-wall collisions

Summary

Introduction

Research on fluid flow containing particles has become important in engineering [1,2,3,4]. e pneumatic conveying focusing on gas-solid two-phase flow plays an important role in a conveying system. E particle trajectories are computed individually at specified intervals during the fluid phase calculation. In the Euler–Lagrange approach, the fluid phase is treated as a continuum by solving the Navier–Stokes equations, while the solid phase is solved by tracking a large number of particles through the calculated flow field [16, 17]. For applications such as these, particle-particle interactions can be included using the discrete phase model (DPM). Previous work has been conducted in the fields of fine particle [20, 21], powder [22,23,24], and seed [25, 26], in which the size was less than 5 mm and in the range of Geldart A to Geldart C

Methods

Results

Conclusion