Title:
Combustion Kinetics of Wet-Torrefied Norwegian Biomass Fuels
Author(s):
Bach, Q.V., Pfeiffer, B., Tran, K.-Q., Khalil, R., Skreiberg, Ø.
Document(s):
Paper
Abstract:
Wet torrefaction, also referred to as hydrothermal carbonization, is a promising pretreatment process to convert a wide range of biomass to energy dense solid fuel. In this process biomass is treated in hot compressed water within the temperature window of 200–260°C. The pressure can be controlled to be higher than the saturated vapour pressure in order to avoid the energy requirements for phase transformation of water in the form of latent heat. The solid remaining from wet torrefaction features, besides an increased HHV, several characteristics which advocate an energy application. Wet¬ torrefied biomass is substantially different from dry¬torrefied biomass and little is known about its intermediate product behaviors in a subsequent thermal conversion process. Especially, the combustion kinetic parameters, which depend highly on the applied process conditions and the feedstock, are almost unknown. This work aims to investigate the combustion kinetics of wet ¬torrefied biomass and the effect of torrefaction conditions on the kinetics. For this purpose, Norwegian biomass fuels including Norwegian spruce and birch wood were first torrefied in hot compressed water at various conditions. The solid products obtained from this step were studied further in a thermogravimetric analysis (TGA) reactor (Mettler Toledo TGA/SDTA851e) in an oxidative environment containing 20% oxygen and 80% nitrogen. Obtained data was tested with different kinetic models for extraction of kinetic parameters.
Keywords:
combustion kinetics, wet torrefaction, biomass fuel, fuel pretreatment
Topic:
R&D on Processes for Solid, Liquid and Gaseous Fuels from Biomass
Subtopic:
Advanced solid biofuels
Event:
20th European Biomass Conference and Exhibition
Session:
3DV.4.11
Pages:
1739 - 1744
ISBN:
978-88-89407-54-7
Paper DOI:
10.5071/20thEUBCE2012-3DV.4.11
Price:
FREE
