A coupled thermal-granular model in flights rotary kiln: Industrial validation and process design

Piton, Maxime; Huchet, Florian; Corre, Olivier Le; Guen, Laurédan Le; Cazacliu, Bogdan

doi:10.1016/j.applthermaleng.2014.10.052

Cited by 30 publications

(31 citation statements)

References 34 publications

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“…For the nominal case, the exchange lengths, which depend on the grain distribution in the kiln cross‐section (see Table and Piton et al lbg=2.320 normalm,

l_{cg} = 9.71 normalm

l_{gw} = 3.55 normalm

, and

l_{sw} = 1.79 normalm

.…”

Section: Analytical Resolution In the Case Of Negligible Thermal Radimentioning

confidence: 52%

“…Within this temperature range, the effect on the heat transfer coefficients is negligible. The convective heat transfer coefficients corresponding to the nominal case are given by the following values (see Piton et al hbg=102.83 normalW·m−2·K−1,

h_{cg} = 112.80 normalW \cdot m^{- 2} \cdot K^{- 1}

h_{gw} = 35.23 normalW \cdot m^{- 2} \cdot K^{- 1}

, and

h_{sw} = 242.96 normalW \cdot m^{- 2} \cdot K^{- 1}

.…”

Section: Analytical Resolution In the Case Of Negligible Thermal Radimentioning

confidence: 99%

“…):

h_{bg} = 102.83 normalW \cdot m^{- 2} \cdot K^{- 1}

h_{cg} = 112.80 normalW \cdot m^{- 2} \cdot K^{- 1}

h_{gw} = 35.23 normalW \cdot m^{- 2} \cdot K^{- 1}

, and

h_{sw} = 242.96 normalW \cdot m^{- 2} \cdot K^{- 1}

. Note that those values are obtained by semi‐empirical relations (see Tables ) obtained from the study of industrial rotary kilns used to process various types of granular matter and that the heat transfer coefficients depend on both

α_{cg}

and

{\dot{m}}_{g}

. Although we focus here on the case of asphalt plants, our approach is valid for any type of granular material as long as the assumptions of the model are valid.…”

Section: Analytical Resolution In the Case Of Negligible Thermal Radimentioning

confidence: 99%

See 2 more Smart Citations

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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“…For the nominal case, the exchange lengths, which depend on the grain distribution in the kiln cross‐section (see Table and Piton et al lbg=2.320 normalm,

l_{cg} = 9.71 normalm

l_{gw} = 3.55 normalm

, and

l_{sw} = 1.79 normalm

.…”

Section: Analytical Resolution In the Case Of Negligible Thermal Radimentioning

confidence: 52%

h_{cg} = 112.80 normalW \cdot m^{- 2} \cdot K^{- 1}

h_{gw} = 35.23 normalW \cdot m^{- 2} \cdot K^{- 1}

, and

h_{sw} = 242.96 normalW \cdot m^{- 2} \cdot K^{- 1}

.…”

Section: Analytical Resolution In the Case Of Negligible Thermal Radimentioning

confidence: 99%

“…):

h_{bg} = 102.83 normalW \cdot m^{- 2} \cdot K^{- 1}

h_{cg} = 112.80 normalW \cdot m^{- 2} \cdot K^{- 1}

h_{gw} = 35.23 normalW \cdot m^{- 2} \cdot K^{- 1}

, and

h_{sw} = 242.96 normalW \cdot m^{- 2} \cdot K^{- 1}

α_{cg}

and

{\dot{m}}_{g}

. Although we focus here on the case of asphalt plants, our approach is valid for any type of granular material as long as the assumptions of the model are valid.…”

Section: Analytical Resolution In the Case Of Negligible Thermal Radimentioning

confidence: 99%

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

et al. 2016

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“…Within the last decade, many studies have been carried out, which use multi-scale modeling of heat and mass transfer processes in various types of rotary reactors [11][12][13][14]. In this work, the comprehensive multiscale numerical analysis of physical and chemical processes in the rotary reactor was performed as applied to oil shale thermal decomposition in the pyrolysis reactor of the UTT unit.…”

Section: Introductionmentioning

confidence: 99%

Modeling study of oil shale pyrolysis in rotary drum reactor by solid heat carrier

Gerasimov

Volkov

2015

Fuel Processing Technology

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“…A numerical model that can simulate the mass transfer in the rotary dryer is proposed by Heydenrych et al However, the model can not accurately predict the mass transfer rates for some operating conditions, such as fast reacting systems ( κ / ω > 2). Piton et al presented a thermal‐granular model employed in the flights rotary kiln, and a set of simulations was carried out to illustrate the effects of rotational speed and flight size on heat transfer. They found that the flight rotary kiln with flight ratio geometry l 1 / l 2 ranging between 0.75 and 1.25 is more efficient.…”

Section: Introductionmentioning

confidence: 99%

An investigation on heat transfer of granular materials in the novel flighted rotary drum

Ling

Peng

et al. 2016

Can J Chem Eng

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In this study, a model is carried out to investigate heat transfer within a granular system in the novel flighted rotary drum (FRD). The model using Eulerian continuum approach (ECA) is developed and then verified by comparing with experimental data published previously. The effects of flight configuration, number of flights, rotational speed, and fill level on heat transfer characteristics are discussed. The results show that increasing rotational speed can intensify heat transfer to a certain degree, but it is not significant. The average temperature of granular materials increases with the increase of the number of flights and the decrease of the fill level. More importantly, the average temperature is strongly dependent on flight configurations (including different length ratios and flight tip angles). There is an enhancement in heat transfer when the length ratio S1/S2 is 1 or the flight tip angle is higher.

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A coupled thermal-granular model in flights rotary kiln: Industrial validation and process design

Cited by 30 publications

References 34 publications

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

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

Modeling study of oil shale pyrolysis in rotary drum reactor by solid heat carrier

An investigation on heat transfer of granular materials in the novel flighted rotary drum

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