Abstract

In this work, Discrete Element Method (DEM) is used in order to calculate the motion of granular material in rotating dryers. We are particularly interested in analysing the effect of flight shape on the behaviour of spherical particles in the cross section of the dryer. We will be using two segments flights and three different profiles : a straight flight (180° between both segments), an angled flight (with an angle of 120°) and a rightangled flight (90°). The results show that the profile of the flight affects significantly the motion of the particles in the cross section of the dryer. Changing the angle between the segment’s flight, changes the flight loading and thus the material hold-up which leads to different discharging profiles of the flight. For a right angled flight, the range of the discharge angle increases leading to a more uniformized cascade pattern in time and an enlarging of the area occupied by the curtains of particles. The specific durations (discharging time, falling time) are also determined and studied as a function of the flight shape.

Highlights

  • Drying granular materials can be defined as the removal of moisture from a solid product

  • Industrial rotary dryer is a tube of length L of circular cross section of a diameter D, with aspect ratio L/D about 10

  • In order to study the effect of flight shape on the behaviour of the granular material, we use EDEM, a highperformance software for bulk material flow simulation based on the Discrete Element Method

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Summary

Introduction

Drying granular materials can be defined as the removal of moisture from a solid product. Rotating dryers are widly used in industry to dry variety of solids [1]. They consist of long drum driven at low speed. The most important of them are the behaviour of the material bed, the holdup of the material by the flights, the material curtains and the mean residence time. In order to study the effect of flight shape on the behaviour of the granular material, we use EDEM, a highperformance software for bulk material flow simulation based on the Discrete Element Method. The flight profiles chosen are: straight flight, large angled flight and right angled flight

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