Analytical solution for the axial solid transport in rotary kilns

Liu, X.Y.; Zhang, J.; Specht, Eckehard; Shi, Yi-Chun; Herz, Fabian

doi:10.1016/j.ces.2008.10.024

Cited by 19 publications

(14 citation statements)

References 7 publications

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“…The effect of dam height was further investigated by Scott et al 24 who considered industrial kilns designed with cylindrical or conical dams at the end or part way along the kiln. An analytical solution to the model equations for the axial mass transport was developed 25,26 which agrees well with the numerical solution of Saeman. 21 The influence of operation parameters and drum geometry on the residence time distribution was investigated.…”

Section: Introductionmentioning

confidence: 91%

“…Based on previous work, 25 Saeman's model provides accurate prediction of one of the key parameters of RTD: the MRT. For the other key parameter, the axial dispersion coefficient, previous work did not provide a quantitative predictive method, 28 since the axial dispersion coefficient largely depends on material shape.…”

Section: Rtd Predictionmentioning

confidence: 99%

“…It should be noticed that the Saeman model is simple but very efficient in capturing axial mass-transfer process in rotary drum, and thus, is still widely used and discussed in recent literatures. 25,26 Advanced model has been developed after the Saeman's model, most of which were proposed to describe the complicated process of cross-sectional mass transfer. As the purpose of this work is to capture the axial mass transfer (RTD) of rotary drum, the use of more advanced models is not required.…”

Section: Bed Depth Distribution and Mrtmentioning

confidence: 99%

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Measurement of residence time distribution in a rotary calciner

et al. 2013

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Rotary calcination is widely used in catalyst manufacturing and many other industrial processes. In this article, the influence of operational variables and material properties on the mean residence time (MRT), hold up, and axial dispersion was investigated in a pilot plant rotary calciner. Residence time distributions (RTD) of spherical, cylindrical, and quadrilobe catalyst particles were measured and contrasted. The Saeman's model was successfully applied to predict the experimental bed depth and the MRT as particles flowed through the calciner. It was observed that increasing the feed rate did not significantly affect the MRT. Results for the different particles indicated that cylinders and quadrulobes exhibited less axial dispersion than spheres due to the decreased flowability. A reliable method was developed to provide a reasonable RTD prediction in rotary calcination systems.

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Section: Introductionmentioning

confidence: 91%

Section: Rtd Predictionmentioning

confidence: 99%

Section: Bed Depth Distribution and Mrtmentioning

confidence: 99%

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Measurement of residence time distribution in a rotary calciner

et al. 2013

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“…Due to their extensive use in industry, there have been several studies aimed at modeling the transport of the solids through the kiln cylinder [1][2][3][4][5][6][7][8][9][10][11][12][13], which is usually equipped with lifters [14][15][16][17]. Most of these studies attempted to understand and predict key parameters such as the hold-up, the mean residence time (MRT) or, as shown in Part I of this study [18], the residence time distribution of solid particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of lifter shape and operating parameters on the flow of materials in a pilot rotary kiln: Part II. Experimental hold-up and mean residence time modeling

et al. 2015

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International audienceExperiments were carried out on a pilot scale rotary kiln equipped with lifters at room temperature to investigate the effects of the kiln slope, rotational speed, mass flow rate of materials, and exit dam height on the hold-up and the mean residence time (MRT). The MRT was determined from the residence time distribution measurements as detailed in Part I of this work. Two granular solids having different properties were used: sand and broken rice. Furthermore, two shapes of lifters were compared to determine the influence of lifter geometry: straight lifters (SL) and rectangular lifters (RL). A new model to predict the MRT was established by means of a dimensional analysis. The correlation not only gave good agreement with the experimental data from the present study, but also demonstrated good predictive performances when applied to published experimental data of other kilns; the model is applicable for inclined kilns that process materials in cascading (tumbling) motion, whether or not equipped with lifters or fitted with dams at the outlet end

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“…The differential equation is solved with the initial condition that bed depth at kiln head equals to the dam height (for kiln without a dam, bed depth at kiln head is taken to be the diameter of single pellet). Analytical solution for the axial solid transportation proposed by Liu et al (2009) is adopted in this study.…”

Section: Solid Motionmentioning

confidence: 99%