Reduction of biomass resilience by torrefaction: apparent stiffness during failure (ASF) and specific failure energy (SFE) assessed by a custom impact device
Abstract
The present work focusses on the loss of resilience of torrefied wood as an indicator of its grindability. An impact device was developed to evaluate the mechanical behaviour of wood at high compression rates with a particular emphasis on the surface area of the particles produced. It allows the energy determination needed to produce particles without a traditional grinding test. Pine (Pinus pinaster) and oak (Quercus robur) were tested in radial (R) and tangential (T) directions and for various torrefaction intensities. With increasing heat intensity, the material becomes more fragile and finally loses its fibrous character, which increases the number of peak events on the stress/strain curve and significantly reduces the deformation energy. Two indices were derived from the experimental results: the apparent stiffness during failure (ASF) and the specific failure energy (SFE). These criteria allow the quantification of the loss of mechanical strength due to torrefaction, as well as the surface area increment of particles for a given grinding energy.
Acknowledgement
This work was financially supported by the ANR project TORBIGAP.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Original Articles
- Cationized fibers from pine kraft pulp: advantages of refining before functionalization
- Tracking the geographical origin of timber by DNA fingerprinting: a study of the endangered species Cinnamomum kanehirae in Taiwan
- Reduction of biomass resilience by torrefaction: apparent stiffness during failure (ASF) and specific failure energy (SFE) assessed by a custom impact device
- Improvement of shear strength, wood failure percentage and wet delamination of cross-laminated timber (CLT) panels made with superheated steam treated (SHST) layers of larch wood
- Water migration in poplar wood during microwave drying studied by time domain nuclear magnetic resonance (TD-NMR)
- The minimum moisture threshold for wood decay by basidiomycetes revisited. A review and modified pile experiments with Norway spruce and European beech decayed by Coniophora puteana and Trametes versicolor
- Effect of volatile organic compounds from Pinus sylvestris and Picea abies on Staphylococcus aureus, Escherichia coli, Streptococcus pneumoniae and Salmonella enterica serovar Typhimurium
- Effect of ozonation on composting Japanese cedar wood meal
- Short Note
- Four-point key-hole side-edge-notched bending (4KHSENB) strength of medium-density fibreboard
Artikel in diesem Heft
- Frontmatter
- Original Articles
- Cationized fibers from pine kraft pulp: advantages of refining before functionalization
- Tracking the geographical origin of timber by DNA fingerprinting: a study of the endangered species Cinnamomum kanehirae in Taiwan
- Reduction of biomass resilience by torrefaction: apparent stiffness during failure (ASF) and specific failure energy (SFE) assessed by a custom impact device
- Improvement of shear strength, wood failure percentage and wet delamination of cross-laminated timber (CLT) panels made with superheated steam treated (SHST) layers of larch wood
- Water migration in poplar wood during microwave drying studied by time domain nuclear magnetic resonance (TD-NMR)
- The minimum moisture threshold for wood decay by basidiomycetes revisited. A review and modified pile experiments with Norway spruce and European beech decayed by Coniophora puteana and Trametes versicolor
- Effect of volatile organic compounds from Pinus sylvestris and Picea abies on Staphylococcus aureus, Escherichia coli, Streptococcus pneumoniae and Salmonella enterica serovar Typhimurium
- Effect of ozonation on composting Japanese cedar wood meal
- Short Note
- Four-point key-hole side-edge-notched bending (4KHSENB) strength of medium-density fibreboard