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MODELING OF ROTARY KILNS

Farid abdi (GREENID)

Abstract

Granular material, fed continuously into the top of a slowly rotating, slightly inclined cylinder, forms a moving bed. Much of the bed rotates with the cylinder in solid body motion. When particles reach the surface of the bed, they move rapidly down it, and are absorbed once more into the solid body motion. Such cylinders are used in calcining, pharmaceutical manufacture, and drying. A steady state transport model, applicable when the bed depth varies slowly along the cylinder, has existed for around 50 years. The bed surface is considered locally flat, and particles in it fall along the line of steepest descent, inclined to the horizontal at the angle of repose. There is reasonable agreement with experiment.

REPORT

AIR LIFT I. DETERMINATION OF IN THE AIR LIFT TANK MOVING SOLID PARTICLE PARAMETERS

László Kovács . Sándor Váradi

Professor emeritus. Associate Professor

Budapest University of Technology and Economics

Abstract

One of the most important vertical pneumatic conveying equipment is the air lift. The paper deals with the mathematical-physical model for describing the important of the air lift. By applying the continuity and the momentum equations written on the control volume we have got differential equations. The equations has been solved using Runge . Kutta method. Diagrams pressure, solid and air velocity, and concentration . obtained as a result of solutions gives a presentation on the basis of a given example.

REPORT

AIR LIFT II. TWO PHASE FLOW IN THE MIXING AREA OF THE AIR LIFT

László Kovács . Sándor Váradi

Professor emeritus. Associate Professor

Budapest University of Technology and Economics

Abstract

In the paper authors have written the momentum equations and the continuity equations in differential form for describing the solid particle parameters in the mixing area of the air lift. Numerical solution of the equations, and presentation of the diagrams, obtained on the basis of a given example.

REPORT

AIR LIFT III. EXAMINE THE EFFECT OF THE IMPORTANT PARAMETERS OF IN THE AIR LIFT TANK MOVING SOLID PARTICLES

Sándor Váradi . László Kovács

Associate Professor . Professor emeritus

Budapest University of Technology and Economics

Abstract

The papers [1] and [2] deal with the mathematical-physical model for describing the important physical parameters of the air lift tank and in the mixing area of the air lift. The results of the theoretical calculations are given in the following diagrams: pressure, solid and air velocity and concentration distributions, at parameters:

Air permeability of the distribution layer / Solid material mass flow / Height of the solid material column in the air lift tank / Loosening velocity / Bulk density / Solid material friction coefficient / Velocity of air flowing out from the nozzle

Article

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