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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 …
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 …
Rotary kilns are widely used in industries to heat or cool various materials. Previously the heat efficiency of rotary kiln is often evaluated by assuming the temperature is uniformly distributed within the particle bed, while lacking insights into the recirculating particle flows and the resulted non-uniform heat transfer.
Abstract Contaminated solid wastes exist in many industrial sites, gas plants, and oil refineries. One method of decontaminating the soil is to subject it to high temperatures in a rotary calciner in an anaerobic environment. Preliminary results from a computational model are presented in this paper for the flow and heat transfer from …
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 …
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).
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 …
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.
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.
Granular flows of a transverse plane in a rotary kiln can be categorized into six transport modes; slipping, slumping, rolling, cascading, cataracting and centrifuging.
The axial discharging velocity of the particles was experimentally investigated at the discharge end of two rotary kilns with 400 and 250 mm internal diameter, respectively. Sand, glass beads and clinker were used as experimental materials. A physical method without using imaging technology was developed to …
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 ...
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 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.
Mixing and Heat Transfer of Granular Materials in an Externally Heated Rotary Kiln. Zhe ... College of Traffic and Transportation Engineering, 410083 …
Mixing and Heat Transfer of Granular Materials in an Externally Heated Rotary Kiln. Zhe Zhang, Central South University, College of Mechanical and Electrical …
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 …
The latter movement has two components, one perpendicular to the kiln axis (k) and one parallel to it (s). Only s makes a contribution to the transport through the kiln. The ratio between s and k depends on the angle of repose (ss) of the material, the slope of the kiln n kv 0 Fig. 1. Schematic representation of rotary kiln with symbols used.
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 …
In literature, there is some studies about the details of the heat and flow in a rotary kiln, however, there are few studies about an alternative design and materials of a rotary kiln In previous ...
This geometrical model is based on the granular transport between the flights, the curtain and the bed in order to obtain the granular distribution in the cross-section of the rotary kiln. ... During the production process, the aggregates are conveyed from stockpiles to rotary kiln where materials are heated at a temperature range …
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 …
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 …
Rotary Kilns Transport Phenomena and Transport Processes. Book • Second Edition • 2016. Author: A. A Boateng ... out with the objective of understanding and to improving …
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}, …
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 ...
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 …
DOI: 10.1016/J.APPLTHERMALENG.2014.10.052 Corpus ID: 109399004; A coupled thermal-granular model in flights rotary kiln: Industrial validation and process design @article{Piton2015ACT, title={A coupled thermal-granular model in flights rotary kiln: Industrial validation and process design}, author={Maxime Piton and Florian Huchet …
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.