Oxyfuel combustion is one of the promising carbon captures for stationary combustion plants. In this works, the combustion characteristics of waste shiitake mushroom compost were compared under oxyfuel condition to Oxy-enrich and air with thermogravimetric analysis (TGA) coupled with fourier transform infrared spectroscopy. The ignition temperature, burnout temperature, C-index, and S-index of the fuel were estimated from TGA results. Kinetic parameter (Ea, A, and reaction order) were also estimated from TGA results using FWO and Coats-Redfern methods. The single pellet combustion was performed to simulate real combustion with high heating rates environment. The TGA results shows that there are 2 distinctive stages of degradation, the first stage is process of devolatilization of volatile matter and the second stage of degradation is process of oxidation of char and heavier compound of the fuel. Some reduction of combustion characteristics also observed when replacing carrier gas from N2 to CO2. Increasing the oxygen concentration of carrier gas at Oxy-enrich condition is more effective to improve the combustion characteristics compared to oxyfuel condition. Single pellet combustion results show prolonged of total burning time of WMC under CO2 environment and delayed of ignition time.

1. Umor, N.A., Zero waste management of spent mushroom compost. Journal of Material Cycles and Waste Management, 2021. 23(5): p. 1726-1736.
2. Grimm, D. and H.A.B. Wösten, Mushroom cultivation in the circular economy. Applied Microbiology and Biotechnology, 2018. 102(18): p. 7795-7803.
3. Singh, A.D., et al., Enzymes from spent mushroom substrate of Pleurotus sajor-caju for the decolourisation and detoxification of textile dyes. World Journal of Microbiology and Biotechnology, 2011. 27(3): p. 535-545.
4. Chaturvedi, S., Bioaugmented composting of Jatropha de-oiled cake and vegetable waste under aerobic and partial anaerobic conditions. Journal of basic microbiology, 2013. 53(4): p. 327-335.
5. Values of Diffusion Coefficients, in Diffusion: Mass Transfer in Fluid Systems, E.L. Cussler, Editor. 2009, Cambridge University Press: Cambridge. p. 117-160.
6. Lu, J.-J. and W.-H. Chen, Investigation on the ignition and burnout temperatures of bamboo and sugarcane bagasse by thermogravimetric analysis. Applied Energy, 2015. 160: p. 49-57.
7. White, J.E., W.J. Catallo, and B.L. Legendre, Biomass pyrolysis kinetics: A comparative critical review with relevant agricultural residue case studies. Journal of Analytical and Applied Pyrolysis, 2011. 91(1): p. 1-33.
8. Guida, M., et al., Utilization of Starink Approach and Avrami Theory to Evaluate the Kinetic Parameters of the Pyrolysis of Olive Mill Solid Waste and Olive Mill Wastewater. Journal of Advanced Chemical Engineering, 2017. 07.
9. Coats, A.W. and J.P. Redfern, Kinetic Parameters from Thermogravimetric Data. Nature, 1964. 201(4914): p. 68-69.
10. Kim, S. and Y. Eom, Estimation of kinetic triplet of cellulose pyrolysis reaction from isothermal kinetic results. Korean Journal of Chemical Engineering, 2006. 23(3): p. 409-414.
11. Jin, Y., Y. Li, and F. Liu, Combustion effects and emission characteristics of SO2, CO, NOxand heavy metals during co-combustion of coal and dewatered sludge. Frontiers of Environmental Science & Engineering, 2016. 10(1): p. 201-210.
12. Krieger, I.M., G.W. Mulholland, and C.S. Dickey, Diffusion coefficients for gases in liquids from the rates of solution of small gas bubbles. The Journal of Physical Chemistry, 1967. 71(4): p. 1123-1129.
13. Tillman, D.A., Wood As an Energy Resource by Tillman David A. (1978-06-01) Hardcover. 1978.
14. Prokkola, H., et al., Chemical Study of Wood Chip Drying: Biodegradation of Organic Pollutants in Condensate Waters from the Drying Process. Bioresources, 2014. 9: p. 3761-3778.
15. Liu, X., et al., Characterization of corncob-derived biochar and pyrolysis kinetics in comparison with corn stalk and sawdust. Bioresource Technology, 2014. 170: p. 76-82.
16. Cavalaglio, G., et al., Characterization of Various Biomass Feedstock Suitable for Small-Scale Energy Plants as Preliminary Activity of Biocheaper Project. Sustainability, 2020. 12(16).
17. Luo, S.Y., et al., Experimental study on oxygen-enriched combustion of biomass micro fuel. Energy, 2009. 34(11): p. 1880-1884.
18. Deng, J., et al., The effect of oxygen concentration on the non-isothermal combustion of coal. Thermochimica Acta, 2017. 653: p. 106-115.
19. Chao, J., et al., The investigation of the coal ignition temperature and ignition characteristics in an oxygen-enriched FBR. Fuel, 2016. 183: p. 351-358.
20. Shan, F., An experimental study of ignition and combustion of single biomass pellets in air and oxy-fuel. Fuel, 2017. 188: p. 277-284.
21. Yuzbasi, N.S. and N. Selçuk, Air and oxy-fuel combustion characteristics of biomass/lignite blends in TGA-FTIR. Fuel Processing Technology, 2011. 92(5): p. 1101-1108.
22. Lopes, F.C.R., K. Tannous, and Y.J. Rueda-Ordóñez, Combustion reaction kinetics of guarana seed residue applying isoconversional methods and consecutive reaction scheme. Bioresource Technology, 2016. 219: p. 392-402.
23. Galina, N.R., et al., Comparative study on combustion and oxy-fuel combustion environments using mixtures of coal with sugarcane bagasse and biomass sorghum bagasse by the thermogravimetric analysis. Journal of the Energy Institute, 2019. 92(3): p. 741-754.
24. Liu, K., X.Q. Ma, and H.M. Xiao, Experimental and kinetic modeling of oxygen-enriched air combustion of paper mill sludge. Waste Management, 2010. 30(7): p. 1206-1211.
25. Lin, Y., et al., Co-pyrolysis kinetics of sewage sludge and bagasse using multiple normal distributed activation energy model (M-DAEM). Bioresource Technology, 2018. 259: p. 173-180.
26. Oudghiri, F., TG–FTIR analysis on pyrolysis and combustion of marine sediment. Infrared Physics & Technology, 2016. 78: p. 268-274.
27. Xu, T. and X. Huang, Study on combustion mechanism of asphalt binder by using TG–FTIR technique. Fuel, 2010. 89(9): p. 2185-2190.
28. Fan, C., et al., XRD and TG-FTIR study of the effect of mineral matrix on the pyrolysis and combustion of organic matter in shale char. Fuel, 2015. 139: p. 502-510.
29. Mau, V. and A. Gross, Energy conversion and gas emissions from production and combustion of poultry-litter-derived hydrochar and biochar. Applied Energy, 2018. 213: p. 510-519.
30. Fairbanks, D.F. and C.R. Wilke, Diffusion Coefficients in Multicomponent Gas Mixtures. Industrial & Engineering Chemistry, 1950. 42(3): p. 471-475.