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Slow rotation of a cylindrical kiln, partially filled with powder or granular solid, produces a planar interface between the bulk of the solid and the gas phase, tilted at the angle of repose. Particles cascade downward on this plane, moving relatively freely and randomly, providing the principal mechanism for particulate diffusion and mixing in the …
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and quantifying the transport processes in the bed ma-terial within a rotary calciner, as shown in Figure 1. The solid particles are normally preheated before they enter the …
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Material flow in partially filled rotating cylinders (rotary kilns) is encountered in many practical applications of material processing, for example incineration, calcination, grain drying, etc. The flow behaviour in the cross-section is important to other transport mechanisms such as mixing and energy distribution within the bed material. The paper …
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This paper reports the results of an experimental and theoretical study to investigate the transient response of the granular flow through a laboratory scale inclined rotating cylinder to large step changes in one of three variables: (i) mass feed rate, (ii) rotation speed or (iii) axis inclination. Experimental measurements are reported for a range of operating …
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Rotary Kilns—rotating industrial drying ovens—are used for a wide variety of applications including processing raw minerals and feedstocks as well as heat-treating hazardous wastes. They are particularly critical in the manufacture of Portland cement. Their design and operation is critical to their efficient usage, which if done incorrectly can …
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This study developed a theoretical approach to understanding how a set amount of a granular bed is discharged from a tilted rotary kiln (an empty cylinder) once its particle size distribution (PSD ...
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Mixing and Heat Transfer of Granular Materials in an Externally Heated Rotary Kiln. Zhe Zhang, Central South University, College of Mechanical and Electrical …
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the transport processes in the bed material within a rotary kiln. The mixing and the heat transfer processes within the ... the bed to the granular materials through conduction, convection, and radiation. Sass4 proposed a one-dimen- ... and quantifying the transport processes in the bed ma-terial within a rotary calciner, as shown in Figure 1. ...
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A parametric study was conducted by varying the material properties of granular material, and rotational speed of the calciner. We use the discrete element model to simulate flow, mixing, and heat transport in granular flow systems in rotary calciners. Simulations and experiments show that the rotation speed has minimal impact on heat transfer.
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Thermal processing of materials in rotary kilns involves heat transfer from the freeboard to the boundary surfaces of bed material and the distribution of this thermal energy within …
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Abstract. Slow rotation of a cylindrical kiln, partially filled with powder or granular solid, produces a planar interface between the bulk of the solid and the gas phase, tilted at the angle of repose. Particles cascade …
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Mixing and Heat Transfer of Granular Materials in an Externally Heated Rotary Kiln. Zhe ... College of Traffic and Transportation Engineering, 410083 …
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Mixing and Heat Transfer of Granular Materials in an Externally Heated Rotary Kiln. Zhe Zhang, Central South University, College of Mechanical and Electrical Engineering, 410083 Changsha, China ... College of Traffic and Transportation Engineering, 410083 Changsha, China. Search for more papers by this author ... It aims …
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Thermal processing of materials in rotary kilns involves heat transfer from the freeboard to the boundary surfaces of bed material and the distribution of this thermal energy within the granular bed. Although the former has been reasonably …
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Rotary Kilns. F or modeling processes in rotary kilns, reduced mathematical models are developed for heat transfer, flame spread and for the movement of material . On the basis all processes are simulated. It describes the influence of the length, the diameter, the rotational speed and the degree of filling of the rotary kiln as …
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The heat and mass transport occurring through a rotary kiln has many industrial applications, such as organic or mineral materials manufacturing. The originality of this …
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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 …
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Semantic Scholar extracted view of "Mass transfer in rolling rotary kilns: a novel approach" by M. Heydenrych et al. ... which accounts for the interaction of all the transport paths and processes, is presented in a three-part series. ... The no-flow problem for granular material in rotating kilns and dish granulators. R. Spurling J.F Davidson ...
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Ranging between 3 GJ/T and 5 GJ/T according to the clinkerization process [5], the rotary kiln process is able to transform the limestone into calcine materials at high temperatures (~2000 °C).
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An analytical expression based on the previous numerical model [5] for calculating the profile of the active layer thickness in a rolling mode of the rotary kilns is proposed by Liu et al. [6]. The experimental results could provide guidance in the selection of constitutive relations which might enable granular flow modeling for rotary kilns.
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DOI: 10.1016/J.PARTIC.2015.02.003 Corpus ID: 92817095; Discharging granular material from a rotary kiln in a slumping regime: Theoretical and experimental studies @article{Donatelli2015DischargingGM, title={Discharging granular material from a rotary kiln in a slumping regime: Theoretical and experimental studies}, author={Antonio …
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DOI: 10.1016/J.CES.2008.10.024 Corpus ID: 95749124; Analytical solution for the axial solid transport in rotary kilns @article{Liu2009AnalyticalSF, title={Analytical solution for the axial solid transport in rotary kilns}, author={Xiaoyan Liu and J. Zhang and Eckehard Specht and Yi-Chun Shi and Fabian Herz}, journal={Chemical Engineering Science}, …
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DOI: 10.1002/CEAT.201800232 Corpus ID: 104474983; Mixing and Heat Transfer of Granular Materials in an Externally Heated Rotary Kiln @article{Zhang2019MixingAH, title={Mixing and Heat Transfer of Granular Materials in an Externally Heated Rotary Kiln}, author={Zhe Zhang and Yi Lun Liu and Xianqiong Zhao …
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1-D thermal-granular model is developed for fl ight rotary kiln. Granular volume fraction is validated in asphalt plant. The different energy fl uxes acting on pavement processing are estimated.
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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 rotation-induced mixing is insufficient to eliminate …
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Introduction. The experimental studies of mean residence time (MRT) and material volumetric flow (MVF) of municipal solid wastes (MSW) in a technical-scale rotary kiln simulator have been conducted in Part I. Modeling on the transport behavior of MSW in rotary kiln provides not only the basis to simulate heat transfer as well as apparent …
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In order to simulate the structure of granular materials in a rotary kiln under the steady-state regime, mathematical models have been developed by different authors. ... K.V. Sastry, D.W. Fuerstenau, The influence of operating variables on the residence time distribution for material transport in a contmuous rotary drum, Powder Technol. 10 ...
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The advancement on the physical heat transfer model in granular system is crucial for the energy process efficiency development such as flights rotary kiln encountered in many industrial areas. The present paper is devoted to a coupled thermal-granular model development applied to that process. Based on the exchange surfaces …
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An analytical solution is derived to predict the axial solid transport in rotary kilns. With it the local depth of the solid bed can be calculated conveniently in dependence on the kiln geometry (diameter and length), the operational variables of the kiln (rotation speed, feed rate and inclination), the property of the material (angle of repose) and the …
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Chemical Engineering Science 64 (2009) 428 -- 431 Contents lists available at ScienceDirect Chemical Engineering Science journal homepage: w w w . e l s e v i e r . c o m / l o c a t e / c e s Shorter Communication Analytical solution for the axial solid transport in rotary kilns X.Y. Liu a,∗, J. Zhang a, E. Specht b, Y.C. Shi b, F. Herz b a b College …
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