Biomass torrefaction characteristics in inert and oxidative atmospheres at various superficial velocities

• Published in: Bioresource technology 2013-10, Vol.146, p.152-160
• Main Authors: Chen, Wei-Hsin, Lu, Ke-Miao, Liu, Shih-Hsien, Tsai, Chi-Ming, Lee, Wen-Jhy, Lin, Ta-Chang
• Format: Article
• Language: English
• Subjects: Air; Atmosphere; Biofuels; Biological and medical sciences; Biomass; Cocos - metabolism; Cryptomeria - metabolism; Drying; Energy yield; Eucalyptus; Eucalyptus - metabolism; Fibers; Fibrous and ligneous biomass; Fundamental and applied biological sciences. Psychology; Gases; Heat and mass transfer; Hot Temperature; Kinetics; Nitrogen - chemistry; Non-oxidative and oxidative torrefaction; Oxidation; Oxygen - chemistry; Palm; Palm Oil; Plant Oils - chemistry; Pyrolysis; Superficial velocity; Temperature; Thermal degradation
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2013.07.064

•Non-oxidative and oxidative torrefaction of biomass are studied.•The superficial velocity or volumetric flow rate of carrier gas is altered.•Thermal degradation of biomass in N2 is controlled by internal heat and mass transfer.•Torrefaction reaction of biomass in air is dominated by surface oxidation.•There exists an upper limit of air superficial velocity in the decrement of solid yield. The reaction characteristics of four biomass materials (i.e. oil palm fiber, coconut fiber, eucalyptus, and Cryptomeria japonica) with non-oxidative and oxidative torrefaction at various superficial velocities are investigated where nitrogen and air are used as carrier gases. Three torrefaction temperatures of 250, 300, and 350°C are considered. At a given temperature, the solid yield of biomass is not affected by N2 superficial velocity, revealing that the thermal degradation is controlled by heat and mass transfer in biomass. Increasing air superficial velocity decreases the solid yield, especially in oil palm fiber and coconut fiber, implying that the torrefaction reaction of biomass is dominated by surface oxidation. There exists an upper limit of air superficial velocity in the decrement of solid yield, suggesting that beyond this limit the thermal degradation of biomass is no longer governed by surface oxidation, but rather is controlled by internal mass transport.