Convective heat transfer analysis in aggregates rotary drum reactor

Guen, Laurédan Le; Huchet, Florian; Dumoulin, Jean; Baudru, Yvan; Tamagny, Philippe

doi:10.1016/j.applthermaleng.2013.01.025

Cited by 27 publications

(20 citation statements)

References 19 publications

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“…This assumption is fully valid for kilns having baffles which ensure a good heat transfer between the grains and the gas. In such a case, which corresponds to recent experimental measurements, the term corresponding to the thermal exchange with the walls (

C D / false(C + D false)

) in Equation is between 2 and 30 times smaller than those corresponding to the transfer between the gas and the grains ( A and B ) and the characteristic length can be reduced to the following:

Λ_{app} \approx \frac{E}{false(I + 1 false) false(A + B false)} = \frac{κ}{h_{cg} l_{cg} + h_{bg} l_{bg}}

where

κ

is the effective mass flow rate

κ = \dot{m_{g}} C_{p, g} \dot{m_{s}} C_{p, s} / false(\dot{m_{g}} C_{p, g} + \dot{m_{s}} C_{p, s} false)

.…”

Section: Analytical Resolution In the Case Of Negligible Thermal Radimentioning

confidence: 99%

See 1 more Smart Citation

Heat convection and radiation in flighted rotary kilns: A minimal model

et al. 2016

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We propose a minimal model aiming to describe heat transfer between particles (i.e. grains) and gases in a model of flighted rotary kilns. It considers a channel in which a convective gas interacts with a granular suspension and a granular bed. Despite its simplicity it captures the main experimental findings in the case of dilute suspension of heavy grains typical of what can be observed in many industrial rotary kilns. Energy balance between each phase takes into account the main heat transfer mechanisms between the transverse granular motion and the convective gas. In the absence of radiation heat transfer, the model predicts exponential variations of the temperatures characterized by a length which depends on the granular and gas heat flow rates as well as on the exchange areas. When radiation is taken into account, the model can be solved numerically. For this case, the temperature variations can be fitted by stretched exponentials whose parameters are found to be independent of the studied phases. Finally, an efficiency criterion is proposed to optimize the length of the system

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C D / false(C + D false)

) in Equation is between 2 and 30 times smaller than those corresponding to the transfer between the gas and the grains ( A and B ) and the characteristic length can be reduced to the following:

Λ_{app} \approx \frac{E}{false(I + 1 false) false(A + B false)} = \frac{κ}{h_{cg} l_{cg} + h_{bg} l_{bg}}

where

κ

is the effective mass flow rate

κ = \dot{m_{g}} C_{p, g} \dot{m_{s}} C_{p, s} / false(\dot{m_{g}} C_{p, g} + \dot{m_{s}} C_{p, s} false)

.…”

Section: Analytical Resolution In the Case Of Negligible Thermal Radimentioning

confidence: 99%

“…The temperatures obtained experimentally in an industrial rotary kiln devoted to asphalt production (symbols) are well fitted by simple exponentials sharing the same characteristic length and equilibrium temperature. The rate of the production is 140 t/h.…”

Section: Quantifying the Importance Of Thermal Radiationmentioning

confidence: 99%

Heat convection and radiation in flighted rotary kilns: A minimal model

et al. 2016

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“…(23) is applied to large-scale pellet rotary kiln, the calculated value of h cgw is very low (less than 5 W m −2 K −1 ), which is inconsistent with those reported in Patisson et al (2000b), Guen et al (2013) and Kreith and Black (1980). Hence, it is taken to be equal to h cgs in the present work instead.…”

Section: Heat Transfermentioning

confidence: 45%

Predictive models and operation guidance system for iron ore pellet induration in traveling grate–rotary kiln process

Fan

Guolin

Chen

et al. 2015

Computers & Chemical Engineering

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“…For this purpose, the present paper considering experimental data obtained in two complementary rotary drums, proposes a new correlation of the wall heat transfer for the rotary kilns. Section 2 describes the measurements performed at large-scale [16] and summarizes the main aero-thermal characteristics. They imply a sketch of the multiphase flow influencing the heat transfer paths.…”

mentioning

confidence: 99%

A wall heat transfer correlation for the baffled-rotary kilns with secondary air flow and recycled materials inlet

Lauredan¹,

Huchet²,

Dumoulin³

2014

Experimental Thermal and Fluid Science

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Nu=f(Re,St) based on a new physical modeling inventory corresponding to the hot and cold fluxes flowing within the baffled-rotary kiln. Thus, the major modification is based on the introduction of the Stanton (St) number in the wall heat transfer correlation. This expression is found more convenient for the baffled-rotary kiln application. This new expression is validated by the comparison with the experimental Nusselt numbers calculated from the inner heat transfer measurements coefficient measured in the baffled-rotary kiln performed at large scale.

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Convective heat transfer analysis in aggregates rotary drum reactor

Cited by 27 publications

References 19 publications

Heat convection and radiation in flighted rotary kilns: A minimal model

Heat convection and radiation in flighted rotary kilns: A minimal model

Predictive models and operation guidance system for iron ore pellet induration in traveling grate–rotary kiln process

A wall heat transfer correlation for the baffled-rotary kilns with secondary air flow and recycled materials inlet

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