Design of Particulate Material Compactor Rolls Diameter

Abstract

Abstract. At present, in a period of an industrial expansion great emphasis is placed on the environment. That means aiming for a reduced energy consumption, and also lessening dustiness from very fine powder material. This category also includes particulate material agglomeration processes. Because this process is very energy-intensive, it is necessary to correctly design these devices. The aim of this paper is to focus on a theoretical design of a production compactor with the rolls diameter for an experimental particulate material, based on Johanson's theory and experimentally measured material properties. The material used for experimental measurements was an NPK-based industrial fertilizer consisting of several components. The results of this paper is the dependence of the ratio of the maximum compression pressure to the initial compression pressure from the rolls diameter of the proposed compactor.

Study of Samples Strength of Material Formed by the Processes of Compaction, Extrusion and Tumbling Granulation

“…Johanson's mathematical model answers the question of what the compactor dimensions and the forces between the rolls should be in order to achieve the necessary pressure for the material at a given temperature. It is assumed that the compacted material is compressible, isotropic, and managed according to the effluent function proposed by Jenike and Shield [7,8].…”

“…The effects of wall friction are gradually reduced, and, on the contrary, the normal components of the stress from the rolls begin to work. In this area, the particles of the material deform and the material becomes compact [8].…”

“…The procedure for derivation and solution of equation (1) is given in works [8][9][10]. Johanson used singleaxis compressibility to describe the strain gradient distribution under the nip angle.…”

“…Based on the relationship (2), it is possible to modify the relation (3) to compute the diameter of the rolls of the compactor. The exact derivation of the relationship (3) is given in [8].…”

Improved model of powder blend compacting in a roll compactor

“…In the classical Johansen model, the limit state of a material is defined by one characteristic, the angle of internal friction. In later modifications of this model [4] the angle between the coordinate axis and the slip line is also introduced. In this case, along with the minimum (residual) angle of internal friction, the effective angle of internal friction is included in the limit state equation.…”