Combustion Characteristics of Biomass Charcoals Produced at Different Carbonization Conditions: A Kinetic Study

• Published in: Energy & fuels 2016-04, Vol.30 (4), p.3186-3197
• Main Authors: Wang, Liang, Várhegyi, Gábor, Skreiberg, Øyvind, Li, Tian, Grønli, Morten, Antal, Michael J
• Format: Article
• Language: English
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/acs.energyfuels.6b00354

The combustion properties of spruce chars and spruce forest residue chars were studied in the kinetic regime by a series of thermogravimetric analysis (TGA) experiments. The work aimed at establishing how the pressure of the char preparation affects the reactivity with oxygen. Parts of the chars were prepared from a thin layer of biomass in inert gas flow at atmospheric pressure and 0.8 MPa. Other chars were formed in a pressurized reactor by a flash carbonization method [ Antal M. J. Jr. ; Mochidzuki K. ; Paredes L. S. Flash carbonization of biomass. Ind. Eng. Chem. Res. 2003, 42 (16), 3690−3699, DOI: 10.1021/ie0301839]. Despite the differences in the preparation, remarkable similarities were observed in the combustion behavior of the samples. The kinetics of the char burnoff was described by assuming three partial reactions. A total of 18 experiments at three different temperature programs were evaluated by the method of least squares to obtain dependable kinetic model variants. A common activation energy of 150 kJ/mol gave a reasonable description for the three partial reactions in all experiments.