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Communication Dans Un Congrès Année : 2017

Characterization of solids transport within flighted rotary kilns : Synthesis of numerous experiments and modeling.

Résumé

Over the years, rotary kilns have become an inescapable benchmark in several industrial sectors. This is because they offer special possibilities regarding a wide range of materials which can be continuously processed with little or no operating labor, especially when they are automatically controlled. The wider the scope of applications, the greater the variety of kiln designs and sizes. Rotary kilns are widely used for the drying or cooling of solid particles, for instance in the food processing industry when dealing with wet or dry granular materials, for the calcination of limestone, petroleum coke, or production of cement. Other applications include: regeneration of spent catalyst, hazardous waste reclamation, defluorination and reduction of uranyl difluoride and so on. Industrial rotary kilns are usually equipped with internal fixtures such as lifters, baffles, constrictions or exit dams. The complex hydrodynamic behavior of the granular materials within rotary kilns has led to extensive research over the years. Most of these publications report on the influence of operating parameters (rotational speed, kiln slope, mass flow rate or exit dam height) on the residence time distribution (RTD) and axial dispersion of solid particles. However, few of these studies analyze the effect of the presence of lifters, their number or shape. We therefore decided to conduct a systematic experimental investigation of RTD, kiln holdup and axial dispersion coefficient for the continuous flow of granular materials in rotary kilns equipped with lifters. To do so, we used two different pilot scale rotary kilns. One is about twice the size of the other. We investigated both the influence of operating parameters (rotational speed, kiln slope, mass flow rate) and of the presence of internal devices (grid, different shapes and number of lifters, different height of exit dam) on a large range of size and shape of particles (two different sands, rice and beech chips). The large set of experimental data obtained, allowed us to build a model based on dimensional analysis, which is useful for industrial applications.
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Dates et versions

hal-01679283 , version 1 (09-01-2018)

Identifiants

  • HAL Id : hal-01679283 , version 1

Citer

Marie Debacq, Clément Haustant, Stéphane Vitu, Jean-Louis Dirion. Characterization of solids transport within flighted rotary kilns : Synthesis of numerous experiments and modeling.. 10th World Congress of Chemical Engineering (WCCE10), Oct 2017, Barcelone, Spain. ⟨hal-01679283⟩
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