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Review on Effects of Torrefaction Process on the Biomass

Ronak G. Megha


This paper contains review of the effects of torrefaction process variables on several types of biomass. In the torrefaction process, biomass is slowly heated in an inert atmosphere and temperature ranges from 200 to 300°C. This results in the complete degradation of hemicellulose content of the biomass and changes the properties of the biomass. Due to the improved properties, it becomes more convenient fuel. It is also called a pretreatment process for gasification and pyrolysis. This process is similar with the carbonization process. Torrefaction process alters mass and energy content of the biomass. Through torrefaction, biomass is transformed into a solid product char with higher calorific value than the raw biomass. Industries found it applicable for the torrefied biomass to be co-fired with coal in power plants because of the close similarity in properties. The characterization of bio-char is carried out like, calorific value, pH, density etc. The characterization of bio-oil and bio-gas is also carried out. Bio-char obtained is having higher calorific value similar to bituminous coal and hence can be used for co-generation and synthesis of activated carbon. In the bio-gas composition, carbon monoxide (CO), hydrogen (H2) and methane (CH4) combustible gases are obtained which can be used for thermal applications.

Keywords: Torrefaction, calorific value, properties of biomass, mechanism

Cite this Article

Megha Ronak G. Review on Effects of Torrefaction Process on the Biomass. Journal of Thermal Engineering and Applications. 2017; 4(2): 27–31p.

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