DEM Modelling of Vibratory Screens
Doctoral thesis, 2021
The main aim of this research is to understand the screening process in different conditions such as different particle size distribution (PSD) and different feed rates. The first step towards achieving the screening model is to understand the influence of different machine parameters and material properties in the screening performance. Some of these parameters have been studied in this research, such as the motion type, the material of the screen media, and the aperture shape. The Discrete Element Method (DEM) has been used to study these parameters with the idea that by using DEM simulation the particle-to-particle and particle-to-geometry interaction can be studied in a way that is impossible to achieve by real experiments.
The study results show that some of the factors have a greater influence on screening, such as the effect of the motion type for the different slope of the deck. Elliptical motion is more efficient compared to linear motion. Also, the aperture shape in different parts of the screen deck has a different effect when using a single-layer or multi-layer material in the feeding point. The result of this research needs further investigation to study the effect of the interaction between different factors before achieving the complete screen model. Another achievement of this research work is to investigate the validation of DEM modelling in screening performance by using a laboratory-scale vibratory screen.
Validation
Modelling
Screen efficiency
DEM simulation
Author
Ali Davoodi
Chalmers, Industrial and Materials Science, Product Development
Validation of a DEM model of screening performance
Minerals Engineering,;Vol. in press(2021)
Journal article
Investigating the effect of the feeding arrangement on screen media wear and screening efficiency by using DEM
Minerals Engineering,;Vol. in press(2021)
Journal article
Application of the Discrete Element Method to Study the Effects of Stream Characteristics on Screening Performance
Minerals,;Vol. 9(2019)
Journal article
Effects of screen decks' aperture shapes and materials on screening efficiency
Minerals Engineering,;Vol. 139(2019)
Journal article
The effect of different aperture shape and material of screen deck on screening efficiency
Other conference contribution
Analysis of Screening Performance using Discrete Element Modeling
Proceedings of the Conference in Minerals Engineering,;Vol. 2017(2017)
Paper in proceeding
To produce aggregates, the rock material needs to be crushed and screened in different stages, which are often high energy-consuming processes. One way to minimize energy consumption is to improve production efficiency. This can be done by analyzing data from the operation and using different simulation platforms to improve equipment utilization.
One of the main classification processes applied in the industry is screening with vibratory screens. A vibratory screen’s main functionality is particle separation, which is a function of gravity, the properties of the granular material, equipment geometry, and the screen’s relative motion. Discrete Element Method (DEM) has been used to study particle behaviour and it is a suitable tool for studying the screening performance. The particle-to-particle and particle-to-geometry interaction can be studied using DEM in a way that is impossible to achieve with physical experiments.
By using DEM simulation, the fundamental understanding of how to improve screening efficiency can be expanded. The advantage of using simulations instead of experiments to improve screening performance is minimizing cost and energy consumption which is one step toward sustainability. Another advantage is that DEM simulations provide practical feedback when designing the vibratory screen. This allows the designer to determine the correctness and efficiency of a design before the screen is constructed.
Subject Categories
Mechanical Engineering
Driving Forces
Sustainable development
Areas of Advance
Production
ISBN
978-91-7905-451-9
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4918
Publisher
Chalmers
Virtual Development Laboratory (VDL), Hörsalsvägen 7A, 412 58, Göteborg and Via Zoom (Password: 586970)
Opponent: Dr. Peter Radziszewski