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TG-DSC method applied to drying characteristics and heat requirement of cotton stalk during drying

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Abstract

Drying characteristics of cotton stalk were investigated at four temperatures (60, 80, 100 and 120 °C) using a simultaneous thermal analyzer (TG-DSC). Heat requirements of cotton stalk during drying were calculated ranging from 189 to 406 kJ/kg. Consequently, Midilli-Kucuk model showed the best fit to experimental drying data. The values of effective diffusivity ranged from 4.38 × 10−9 to 8.15 × 10−9 m2/s, and the activation energy was calculated to be 11.6 kJ/mol.

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Abbreviations

a, b, k, n :

Drying parameters

k 0 :

Drying constants (1/min)

D eff :

Effective moisture diffusivity (m2/s)

MR exp,i :

Experimental moisture ratio

MR pre,i :

Predicted moisture ratio

M e :

Equilibrium moisture content (kg water/kg wet matter)

M 0 :

Initial moisture content (kg water/kg wet matter)

M :

Moisture content at any time of drying (kg water/kg wet matter)

N :

Number of observations

z :

Constant, positive integer

n :

Number of drying constants

R :

The ideal gas constant (J/mol K)

R 2 :

Determination of coefficient

χ 2 :

Reduced Chi-square

t :

Drying time (s)

T :

Drying temperature (°C)

L :

Half thickness of the sample pan (m)

D 0 :

The pre-exponential factor (m2/s)

E a :

The activation energy for drying (kJ/mol)

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Acknowledgments

The authors thank National Natural Science Foundation of China (50930006, 50876099), National Basic Research Program of China (2007CB210203), and Knowledge Innovative Program of the Chinese Academy of Sciences (KGCX2-YW-306) for financial support.

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Authors and Affiliations

  1. Key Laboratory for Biomass Clean Energy of Anhui Province, University of Science and Technology of China, Hefei, 230026, China

    Dengyu Chen, Ming Li & Xifeng Zhu

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  1. Dengyu Chen
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  2. Ming Li
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  3. Xifeng Zhu
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Correspondence to Xifeng Zhu.

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Chen, D., Li, M. & Zhu, X. TG-DSC method applied to drying characteristics and heat requirement of cotton stalk during drying. Heat Mass Transfer 48, 2087–2094 (2012). https://doi.org/10.1007/s00231-012-1050-6

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