THERMAL DECOMPOSITION OF GRANULAR BIOFUEL OBTAINED BY DIFFERENT METHODS OF ACTIVATION
Abstract
The article considers the effect of the granulometric composition of pine wood sawdust and granulation modes on the thermal decomposition of biofuel. Mechanical activation and thermal activation of raw materials before pressing were used in the study. Thermal decomposition of granular fuel was carried out by the methods of thermogravimetry and differential thermal analysis. The temperature ranges of dehydration, thermal decomposition of organic and mineral substances, moisture and ash content of the fuel have been determined. The rates of thermal decomposition of organic substances in granular fuel were also determined. The thermal effects of thermal decomposition of the granule samples were compared. It is registered that the equilibrium moisture content of granules obtained after thermal activation of the raw material is lower than that for granules made by cold pressing. This is indirect evidence of their increased density. It has been determined that most of the heat of thermal decomposition of organic substances in granular fuels is released in the high-temperature period at a decomposition rate of 1,12 to 1,37 % dry matter per minute. It was revealed that the thermal effect of thermal decomposition of granules depends on the fractional composition of the ground raw materials. This may be due to the difference in the chemical composition of the fractions. The analysis of obtained results made it possible to determine that the mechanical activation of raw materials increases the average rate of granule decomposition, and thermal activation reduces it. That is, the mechanical activation of raw materials has a positive effect on the thermal decomposition process. Grinding wood sawdust to particles smaller than 0,2 mm can lead to partial destruction of complex macromolecular compounds (hemicellulose, cellulose and lignin). Thus, this leads to a decrease in the degree of intermolecular interaction and intensification of the decomposition process.
References
2. Parikka M. Global biomass fuel resources. Biomass Bioenergy, 2004. Vol. 27. Is. 6. P. 613–620. https://doi.org/10.1016/j.biombioe.2003.07.005.
3. Sikkema R., Steiner M., Junginger M., Hiegl W., Hansen M.T., Faaij A. The European wood pellet markets: current status and prospects for 2020. Biofuels, Bioproducts and Biorefining, 2011. Vol. 5. Is. 3. P. 250–278. https://doi.org/10.1002/BBB.277.
4. Ungureanu N., Vladut V., Voicu Gh., Dinca M.-N., Zabava B.-St. Influence of biomass moisture content on pellet properties – review. Conference: 17th International Scientific Conference Engineering for Rural Development At: Jelgava, Latvia 23.–25.05.2018. https://doi.org/10.22616/ERDev2018.17.N449.
5. Nunes L.J.R., Matias J.C.O., Catalão J.P.S. Mixed biomass pellets for thermal energy production: A review of combustion models. Applied Energy, 2014. Vol. 127. P. 135–140. https://doi.org/10.1016/j.apenergy.2014.04.042.
6. Evdokimov N.V., Aleksandrov A.V. [Devel-opment of technology for briquetting wood waste using the binder composition on the basis of mechanically hydrolytic lignin], [Actual research directions of the XXI century: Theory and Practice], 2014. No. 2-3(7-3). P. 65–68. https://doi.org/10.12737/3190. (in Rus.)
7. Stolarski M.J., Szczukowski S., Tworkowski J., Krzyżaniak M., Gulczyński P., Mleczek M. Comparison of quality and production cost of briquettes made from agricultural and forest origin biomass. Renewable Energy, 2013. Vol. 57. P. 20–26. https://doi.org/10.1016/j.renene.2013.01.005.
8. Sevastiyanova S.N. [Bioenergetics. Wood (fuel) granules], [Vestnik of the Orenburg State University], 2009. No. 10. P. 133–138. (in Rus.)
9. Lehtikangas P. Quality properties of pelletised sawdust, logging residues and bark. Biomass Bioenergy, 2001. Vol. 20. Is. 5. P. 351–360. https://doi.org/10.1016/S0961-9534(00)00092-1.
10. Sikkema R., Junginger H.M., Pichler W., Hayes S., Faaij A.P.C. The international logistics of wood pellets for heating and power production in Europe: costs, energy-input and greenhouse gas balances of pellet consumption in Italy, Sweden and the Netherlands. Biofuels Bioproducts and Biorefining, 2010. Vol. 4. Is. 2. P. 132–153. https:doi.org/10.1002/bbb.208.
11. Demirbas A., Sahin-Demirbas A. Briquetting properties of biomass waste materials. Energy Sources, 2004. Vol. 26. No. 1. P. 83–91. https://doi.org/10.1080/00908310490251918.
12. Zeng T., Kallio M., Ovarainen H. Critical review on the pelletizing technology, combustion technology and industrial‐scale systems. 2012.
https://www.dbfz.de/fileadmin/MixBioPells/publications/D31_Critical_Review_about_pelletising_and_combustion_technology_FINAL.pdf.
13. Protić M., Mitić D., Stefanović V. Wood pellets production technology. Safety Engineering, 2011. Vol. 1. No. 1. Р. 23–26. https://doi.org/10.7562/SE2011.1.01.05.
14. Sudakova I.G., Rudenko N.B. [Obtaining of solid biofuels from plant waste (Review)], [Journal of Siberian Federal University. Chemistry], 2015. Vol. 8, No. 4. P. 499–513. https://doi.org/10.17516/1998-2836-2015-8-4-499-513. (in Rus.)
15. Stelte W., Holm J.K., Sanadi, A.R., Barsberg S., Ahrenfeldt J., Henriksen U.B. Fuel pellets from biomass: The importance of the pelletizing pressure and its dependency on the processing conditions. Fuel, 2011. Vol. 90. P. 3285–3290. https:doi.org/10.1016/j.fuel.2011.05.011.
16. Mani S., Tabil L., Sokhansanj S. Effects of compressive force, particle size and moisture content on mechanical properties of biomass pellets from grasses. Biomass & Bioenergy. 2006. Vol. 30. P. 648–654. https://doi.org/10.1016/j.biombioe.2005.01.004.
17. Mykhailyk V., Korinchevska T., Korinchuk D., Dakhnenko V. [Thermal analysis of granular biofuel torified in the atmosphere of its own gaseous environment], [Thermophysics and Thermal Power Engineering], 2019. Vol. 41. No. 4. P. 70–77. https://doi.org/https://doi.org/10.31472/ttpe.4.2019.10. (in Ukr.)
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