Rotary cylinders: Transverse bed motion prediction by rheological analysis

Perron, Jean; Bui, R. T.

doi:10.1002/cjce.5450700203

Cited by 12 publications

(15 citation statements)

References 15 publications

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“…Several authors have related the time of residence to the rotation speed of rotary kilns. Let us mention those given in [20][21][22]. Their residence time calculations are summarized below: [20] reported in 1951:…”

Section: Rotation Speed Calibrationmentioning

confidence: 99%

“…Formula reported by [20] requires the knowledge of the dynamic angle of repose; which is unknown in our case. The kiln slop is required in order to use the formula from [21]. Kiln is inclined 17˚.…”

Section: Rotation Speed Calibrationmentioning

confidence: 99%

“…Kiln is inclined 17˚. Table 3 below give residence time calculated using formulas [21,22]. We first calibrate the rotation speed of the combustion chamber.…”

Section: Rotation Speed Calibrationmentioning

confidence: 99%

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Improving Municipal Solid Waste Land Filling Disposal Process: Experiments with a Laboratory Scale Rotary Kiln

Nzihou¹

2013

JEP

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Developing countries often face the challenge of managing continuously growing quantity of municipal waste. Waste is often disposed of by stockpiling and land filling because these have been found the cheapest waste disposal methods in the world. Unfortunately, these waste disposal methods are often source of visual pollution, water contamination and greenhouse effect gas emissions. Waste disposal by incineration has been found effective and now is one of the mostly used waste disposal method in several developed countries. Nevertheless, setting up appropriate waste incinerator requires a good of the combustion process. Unfortunately, direct studies on industrial facilities are not easily feasible because of technical issues and financial limitations. Studies and throughout testing frequently need to be carried out at laboratory scale. Work herein reported first overviewed operation conditions of the landfill facility in the town of Ouagadougou. In the second time for incineration simulation, batch experiments are carried out with a rotary kiln furnace to study the effects of the residence time on emissions of NO, NO 2 , CO, CO 2 and SO 2 in the atmosphere. For each rotation speed, emissions of NO, NO 2 , CO, CO 2 and SO 2 from the incineration of a household combustible fraction model waste consisting of wood (53%), cardboard (25%) and plastics (22%) have been recorded. The lifespan of the land filling facility with incineration has been estimated. Our work show that it may be improved up to roughly three times that of simple land filling. Visual pollution maybe drastically reduced and atmospheric pollution reduced.

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Section: Rotation Speed Calibrationmentioning

confidence: 99%

Section: Rotation Speed Calibrationmentioning

confidence: 99%

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Improving Municipal Solid Waste Land Filling Disposal Process: Experiments with a Laboratory Scale Rotary Kiln

Nzihou¹

2013

JEP

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“…Peron and Bui [5] modeled the transverse particle flow using several Newtonian and non-Newtonian constitutive relationships. Pseudo-plastic behavior combined with adjustment of the "flow behavior parameter" gave the best fit to the limited experimental data of Tscheng and Watkinson.…”

Section: Introductionmentioning

confidence: 99%

The rotary kiln: An investigation of bed heat transfer in the transverse plane

Dhanjal¹,

Barr

Watkinson

2004

Metall Mater Trans B

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Rotary kilns are commonly employed to thermally process granular materials. While kiln rotation promotes particle mixing and heat transfer, it also leads to de-mixing through segregation of finer or denser particles, creating a "kidney" within the bed. Experience and experimental evidence indicate that rotationinduced mixing is insufficient to eliminate radial thermal gradients within the bed, but it is unclear as to whether particle segregation plays a significant role in the development of these gradients. This article presents experimental data obtained by heating sand of varying particle-size distributions within a 0.4-m ID batch rotary kiln to bed temperatures up to 775 °C. The results suggest that segregation has little influence on heat transfer within the bed and that radial thermal gradients are primarily the result of inadequate particle mixing. In order to scale up the experimental results, a mathematical model for heat transfer within the transverse plane was developed. A key variable for the model is the mixinginduced conductivity applied to the active layer, for which an empirical value is derived by fitting model predictions to the experimental data. Based on several assumptions for scaling of mixing conductivity with kiln size, model predictions for radial thermal gradients are presented for industrial-scale kilns in the 2-to 4-m ID range.

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“…In the earlier work of Perron and Bui (1992) a two-dimensional mathematical model was developed for the cascading motion by applying the Navier-Stokes equations to the material bed of the rotating cylinder. The partial differential equation system was solved with the aid of the CFD software package FLUENT.…”

Section: Introductionmentioning

confidence: 99%