National Metallurgical Laboratory, (CSIR), Jamshedpur

1. Thermal decomposition kinetics of biomass wastes used in energy co-generation C.SASIKUMAR & K.K.S. GAUTAM Department of MSME, MANIT, Bhopal T.C.ALEX & S.SRIKANTH National Metallurgical Laboratory, (CSIR), Jamshedpur

2. Kinetics studies of biomass materials and its complexity Rate at which a chemical process occurs. Besides information about the speed at which reactions occur, kinetics also sheds light on the reaction mechanism (exactly how the reaction occurs). Biomass wastes - hemi-cellulose, cellulose and lignin Possibility of change in reaction mechanism with temperature Complex multiple reactions - series, parallel or independent overlapping reactions

3. Program on decomposition Studies of biomass Materials Rise Husk Groundnut Shell Coffee Husk Bagasse Cotton Flower Wood - chips

4. Various conditions of Thermal decomposition of sugarcane bagasse Biomass Biomass + Coal Argon Atmospheric air Oxygen Atmosphere Fuel mix 0.5 to 100 0C/min • Isothermal • Non-isothermal • Linear heating • Non-linear heating Heating rate Heating method

5. Thermogravimetric Studies of Sugarcane bagasse TG/DTA analyzer (Seiko, Japan, Model No. A320)

6. chemical composition (%w/w) of the bagasse By murugappa groups R&D, Chennai, India.

7. TG-DTG Results of Sugarcane bagasse at Argon atmosphere

8. DTA -Sugarcane bagasse Argon atmosphere

9. TG & DTG Results of Sugarcane bagasse in static air

10. TG & DTG Results of Sugarcane bagasse in Oxygen atmosphere

11. The integral and differential from of various reaction models

12. Decomposition of sugarcane bagasse - Reaction Mechanism The plot of ln[g(α)/T2] and 1/T yields a straight line with a slope of –E/R.

13. Selection of suitable reaction model for overall decomposition reaction of sugarcane bagasse at 2 K/min.

14. Separation of hemi-cellulose, cellulose and lignin decomposition reactions

15. Mass loss reactions of hemi-cellulose, cellulose and lignin of sugarcane

16. Selection of suitable reaction model after resolution - decomposition reaction of hemi cellulose in sugarcane bagasse at 2 K/min.

17. Comparison of experimental and reconstructed α-T plots of hemi-cellulose decomposition at 2 K/min.

18. The kinetic parameters of overall decomposition & hemi-cellulose decomposition derived with different reaction models.

19. MODEL FREE METHODS – HEMI CELLULOSE, CELLULOSE & LIGNIN Variation of activation energy with fraction reacted for hemi-cellulose, cellulose and lignin decomposition reactions and overall decomposition reaction of sugarcane bagasse.

20. The kinetic parameters of hemi-cellulose, cellulose and lignin derived with model free iso-conversional methods.

21. NON-LINEAR LEAST SQUARE MINIMZATION METHOD

22. The derivation of kinetic parameters of hemi-cellulose, cellulose and lignin in sugarcane bagasse using a non-linear least square minimization method.

23. Reconstruction of fraction reacted (α) vs temperature plot using the kinetic parameters derived from integral method for hemi-cellulose decomposition

24. Conclusions About 70-80 percent mass loss was occurred at argon atmosphere. The separation of overall reaction showed about 92-96% of hemi-cellulose, 91-95.5% cellulose and 94-97% lignin decomposition. The decomposition of cellulose and hemi-cellulose occurred rapidly while decomposition of lignin was sluggish in nature. The selection of suitable reaction model was possible after separation of hemi-cellulose, cellulose and lignin decomposition reactions. The reaction order model f(α) = (1- α)1.5, better described the kinetics of hemi-cellulose, cellulose and lignin decomposition. The activation energy of hemi-cellulose and lignin increased with heating rate, while the activation energy of cellulose decreased with heating rate. The non-linear least square minimization method showed better results

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