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Pyrolysis of Sawdust, Rice Husk and Sugarcane Bagasse: Kinetic Modeling and Estimation of Kinetic Parameters using Different Optimization Tools

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Abstract

The present study provides the kinetic model to describe the pyrolysis of sawdust, rice-husk and sugarcane bagasse as biomass. The kinetic scheme used for modelling of primary pyrolysis consisting of the two parallel reactions giving gaseous volatiles and solid char. Estimation of kinetic parameters for pyrolysis process has been carried out for temperature range of 773–1,173 K. As there are serious issues regarding non-convergence of some of the methods or solutions converging to local-optima, the proposed kinetic model is optimized to predict the best values of kinetic parameters for the system using three approaches—Two-dimensional surface fitting non-linear regression technique, MS-Excel Solver Tool and COMSOL software. The model predictions are in agreement with experimental data over a wide range of pyrolysis conditions. The estimated value of kinetic parameters are compared with earlier researchers and found to be matching well.

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Abbreviations

A i :

Pre-exponential factor (s−1)

E i :

Activation energy (kJ/mol)

k i :

Reaction rate constant for first order reaction (s−1)

M :

Total number of experimental data points for entire range of temperature

R :

Universal gas constant (8.314 J/mol K)

t :

Residence time (s)

T :

Holding temperature (K)

V i :

Yield of material i (either gaseous volatiles or char) at any time t also known as weight fraction, which is the ratio of weight of product at any time to the initial weight of biomass sample (−)

V * i :

Ultimate value of Vi at long residence time and high temperature, determined as a part of fitting procedure by including experimental data at high conversion (−)

V j :

Simulated weight fraction calculated by using kinetic parameters (A i , E i ) (−)

V mj :

Experimental residual weight fraction (−)

δ i :

Root mean square error for each data point

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Acknowledgments

The authors wish to acknowledge the contribution of Visvesvaraya National Institute of Technology, Nagpur, India for providing experimental and other necessary facilities to carry out this research work.

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Authors and Affiliations

  1. Chemical Engineering Department, Visvesvaraya National Institute of Technology, Nagpur, 440010, India

    Ruta Dhanram Khonde & Ashish Subhash Chaurasia

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  1. Ruta Dhanram Khonde
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  2. Ashish Subhash Chaurasia
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Correspondence to Ashish Subhash Chaurasia.

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Khonde, R.D., Chaurasia, A.S. Pyrolysis of Sawdust, Rice Husk and Sugarcane Bagasse: Kinetic Modeling and Estimation of Kinetic Parameters using Different Optimization Tools. J. Inst. Eng. India Ser. E 96, 23–30 (2015). https://doi.org/10.1007/s40034-014-0052-y

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