Energy Education Science and Technology Part C: Future Energy Sources
2015 Volume (issue) 7(2): 127-142
Fundamental mechanisms and
reaction kinetics of biomass pyrolysis
Sirnak University, Faculty of Engineering, Sirnak, Turkey
Received: 14 January, 2015; accepted: 16 February, 2015
Thermochemical reforming of biomass concerns the processes of catalytic and non-catalytic pyrolysis as well as the gasification, which aims at the maximization of the production of energetically exploitable liquid and gaseous products. Thermal conversion of biomass has received special attention since it leads to useful products and simultaneously contributes to solving pollution problems arising from biomass accumulation. The main objective in doing the present study is to investigate pyrolysis mechanisms and kinetic parameters of biomass structural constituents. The pyrolysis conversion process is defined as thermal degradation of biomass without complete combustion that is in the absence of air or with very limited amount of oxidising agents. Depending on the type of process used, three main products, which are formed, are char, pyrolytic oil and gaseous fuel of low heating value. These products are of interest as they are possible alternate sources of energy. The most interesting temperature range for the production of the pyrolysis products is between 625 K and 775 K. The charcoal yield decreases as the temperature increases. Production of liquid products is maximum at temperatures between 625 K and 725 K. In all thermochemical conversion processes, pyrolysis plays a key role in the reaction kinetics and hence in reactor design and determining product distribution, composition, and properties.
Keywords: Biomass; Pyrolysis; Mechanisms of pyrolysis; Kinetics for pyrolysis