An efficient method for computational flow-based simulation of heat
A series of experimental runs was carried out using the realistic but controlled arrangement of a pilot rotary kiln to obtain temperature data for the validation of a novel model that couples a computational fluid dynamics model of the flame to a granular bed model through heat transfer terms. The rotary kiln was 5.27 m long, with an internal ...
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Heat Transfer Mechanisms in an Indirectly Heated …
A steady-state axial heat transfer model has also been developed for a kiln with segmented lifters. The model predicts the temperature profiles at inner heat tube, in the freeboard gas, in the bed, on the tube wall and the outer heat tube in the flue gas. The model incorporates developed solid transport and mixing correlations, as well as
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Numerical simulation of particle motion and heat transfer in a rotary kiln
The two-fluid model and the granular flow theory were combined with the heat transfer model and used to simulate a rotary kiln. The heat transfer and mixing characteristics in the two-dimensional cross-section were investigated by numerical simulation to analyze the influence of certain factors on the heat transfer.
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Full-scale 3D-modelling of the radiative heat transfer in …
This work discusses the development and use of a detailed 3D radiative heat transfer model of a rotary kiln with a present bed material, used for iron ore pelletizing.
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The rotary kiln: An investigation of bed heat transfer in the
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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Heat transfer in a rotary kiln (Conference) | OSTI.GOV
An improved heat transfer model has been developed for a direct-fired rotary kiln. The treatment of radiant heat transfer was based on the Reflection Method developed by Succec and applied by Gorog, and was extended to account for radiation from a flame. Some elements of the Resistive Network Method and Zone Method were incorporated in …
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A heat-transfer model for the rotary kiln: Part II.
A model of rotary kiln heat transfer, which accounts for the interaction of all the transport paths and processes, is presented in a three-part series. In this second paper, the development of a unified model for heat transfer at a kiln cross-section is described. Heat transfer within the kiln refractory wall was solved using a finite-difference approximation …
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Coarse-grained discrete element method of particle behavior and heat
CGSF was applied to a rotating drum (i.e., a cold model of a rotary kiln), and they demonstrated that CGSF is effective for coarse-grained DEM simulations of particle behavior in a rotating drum [14]. ... Simulation results of heat transfer in rotary kiln with and without heat transfer scaling. M-CGSF-x4/woHTS denotes a case where only …
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(PDF) A Mathematical Model of Heat Transfer in a …
Based on the analysis of heat transfer mechanisms, a one-dimensional axial heat transfer model for an internally heated rotary kiln is presented. The theoretical predictions and empirical equations of the heat transfer …
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Modeling of Solid Particle Flow and Heat Transfer in …
tary kiln calciner. A fluidization model using kinetic theory of granular flow has been employed to solve the particle flow and heat transfer problem. While a two-dimensional model is used to predict the rotation induced flow of the solid particles, a pseudo three-di-mensional model for heat transfer is developed where
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Dynamic modeling of the heat transfer process in rotary kilns …
The lime rotary kiln system uses the entropy and grey correlation model, combining the lime rotary kiln operation process to determine the input and output …
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The effects of rotary kiln operating conditions and design …
A mathematical model of heat transfer in a directly-fired rotary kiln is developed and used to examine the effects of operating and design parameters on burden temperature. The model includes a mean beam length radiation model and axial zoning. Conductive and convective heat transfer are also included.
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Radiative heat transfer in rotary kilns
Radiative Heat Transfer in Rotary Kilns J. P. GOROG, J. K. BRIMACOMBE, AND T. N. ADAMS ... amongst the gas, solids, and wall of a rotary kiln, and to develop a radiation model based on real-gas behavior. The study may be divided into three sections: i) The radiative characterization of the freeboard gas, ...
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Computer Simulation of Heat Transfer in a …
The kiln length predicted by the present model is 5.74 m as compared to 5.5 m of the pilot kiln used in the experimental study of Watkinson and Brimacombe (1982, Watkinson, A.P. and Brimacombe, J ...
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Heat transfer from flames in a rotary kiln | Metallurgical …
Heat flow in the flame zone of a direct-fired rotary kiln has been modeled mathematically. The flame has been assumed to be cylindrical in shape, backmixed radially, and moving axially in plug flow. The length of the flame and the rate of entrainment of secondary air have been characterized by empirical equations reported in the literature. It has been …
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Mathematical modeling of heat recovery from a rotary kiln
The heat transfer from the surface of the rotary kiln to the environment takes place via both radiation and conduction. Rayleigh (Ra D) and Nusselt (Nu D) numbers, needed to calculate the heat transfer coefficient by conduction for the heat transfer from the surface of the rotary kiln, have been found as 30.16 × 10 7 and …
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A Mathematical Model of Heat Transfer in a Rotary Kiln …
In particular, an extended penetration theory is successfully developed to describe the heat transfer coefficient of the covered wall to the bulk solid in a rotary kiln, i.e., h cw–cb = (χd p /k g + 0.5/) –1 (0.096 < χ < 0.198). A one-dimensional axial heat transfer model for an internally heated rotary kiln has been developed.
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Full-scale 3D-modelling of the radiative heat transfer in rotary …
This work discusses the development and use of a detailed 3D radiative heat transfer model of a rotary kiln with a present bed material, used for iron ore pelletizing. A discrete ordinates method is used to solve the radiative heat transfer equation with radiative properties calculated using a weighted-sum-of-grey-gases (WSGG) model for …
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Numerical investigation on the heat transfer of plastic waste …
A CFD-DEM model simulated heat transfer between plastic and sand in a rotary furnace. • Loading solid heat carriers in the kiln can promote the heat transfer for pyrolysis. • The volatile residence time in the kiln increased with the loading of heat carriers. • Increasing the solid heat carrier loading could reduce the wax yield from ...
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A Mathematical Model of Heat Transfer in a Rotary Kiln …
Rotary kilns are used ubiquitously in the chemical and metallurgical industries. The mechanism of heat transfer in a rotary kiln is discussed in this paper, in which the effect of rotation is considered in determining heat transfer coefficients. In particular, an extended penetration theory is successfully developed to describe the …
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The Effects of Rotary Kiln Operating Conditions and …
heat transfer calculations useful for estimating the effects of kiln design and operation on burden temperature. This pa-per presents a mathematical model of heat transfer in direct-ly-fired rotary kilns. The model uses one-dimensional zon-ing along the kiln axis with a mean beam length radiation model.
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Heat Transfer Conditions in Hydrogen-Fired Rotary Kilns …
radiative heat transfer from particles and gases, as well as convective and conductive heat transfer are all examined in an in-house modeling tool of rotary kilns. …
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Numerical study of particle behaviours and heat transfer in …
The heat transfer coefficient in this rotary kiln is discussed in order to guide the engineering design. Due to the complexity of the particle motion and heat transfer process in the rotary kiln, the overall volumetric heat transfer coefficient was mostly used (Alqahtani, Alenazy, & Pandiaraj, 2020; Ding, Lu, Chen, He, & Ou, 2011).
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Smoothed particle hydrodynamics simulation of transient heat transfer …
The heat transfer coefficient and the effective heat transfer area are the two key factors for optimizing the heat transfer model of rotary kiln, which have attracted much attention from researchers. Previous experimental studies have shown that the heat transfer in the rotary kiln is attributed to six mechanisms as shown in Fig. 1, including ...
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A thermal model for the rotary kiln including heat transfer …
A mathematical model was developed to predict heat transfer from the freeboard gas to the bed of a rotary kiln. The thermal model incorporates a two-dimensional representation of the bed's transverse plane into a conventional one-dimensional, plug flow model for rotary kilns.
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Lifter design for enhanced heat transfer in a rotary kiln …
K. E. Peray, The rotary cement kiln, Second Ed. Chemical Publishing, New York, USA (1986). Google Scholar A. A. Boateng and P. V. Barr, A thermal model for the rotary kiln including heat transfer within the bed, International Journal of Heat and Mass Transfer, 39 (1996) 2131–2147.
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Combustion and Heat Transfer Simulation of Rotary Cement Kiln …
Differences between the published and most rotary cement kilns, like the decomposition rate of kiln feed, were considered, and the data of a 2 500 t/d rotary cement kiln in China was accumulated ...
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Heat transfer from flames in a rotary kiln
Moles 12 recently have developed a heat-transfer model for a large enclosed flame in a rotary cement kiln. The model is based on the zone method of Hottel and Sarofim )3 modified to take into account the specific firing conditions common to a large cement kiln. With this model, both temperature
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Rotary kiln process: An overview of physical mechanisms, …
A fast and efficient computational model of the pilot kiln was developed to predict the burner flame and heat transfer in the kiln; the granular bed was modelled using a one-dimensional model ...
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Computer Simulation of Heat Transfer in a Rotary Lime Kiln
DOI: 10.1115/1.4039299 Corpus ID: 126267654; Computer Simulation of Heat Transfer in a Rotary Lime Kiln @article{Agrawal2018ComputerSO, title={Computer Simulation of Heat Transfer in a Rotary Lime Kiln}, author={Ashish Agrawal and Partha S. Ghoshdastidar}, journal={Journal of Thermal Science and Engineering Applications}, …
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