skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Impact of Thermal Pretreatment Temperatures on Woody Biomass Chemical Composition, Physical Properties and Microstructure

Journal Article · · Energies (Basel)
DOI:https://doi.org/10.3390/en11010025· OSTI ID:1419428
 [1];  [1]
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)

Thermal pretreatment of biomass by torrefaction and low temperature pyrolysis has the potential for generating high quality and more suitable fuels. To utilize a model to describe the complex and dynamic changes taking place during these two treatments for process design, optimization and scale-up, detailed data is needed on the property evolution during treatment of well-defined individual biomass particles. The objectives of this study are to investigate the influence of thermal pretreatment temperatures on wood biomass biochemical compositions, physical properties and microstructure. Wild cherry wood was selected as a model biomass and prepared for this study. The well-defined wood particle samples were consecutively heated at 220, 260, 300, 350, 450 and 550 °C for 0.5 h under nitrogen. Untreated and treated samples were characterized for biochemical composition changes (cellulose, hemicellulose, and lignin) by thermogravimetric analyzer (TGA), physical properties (color, dimensions, weight, density and grindablity), chemical property (proximate analysis and heating value) and microstructural changes by scanning electron microscopy (SEM). Hemicellulose was mostly decomposed in the samples treated at 260 and 300 °C and resulted in the cell walls weakening resulting in improved grindability. The dimensions of the wood were reduced in all directions and shrinkage increased with increased treatment temperature and weight loss. With increased treatment temperature, losses of weight and volume increased and bulk density decreased. The low temperature pyrolyzed wood samples improved solid fuel property with high fuel ratio, which are close to lignite/bituminous coal. Morphology of the wood remained intact through the treatment range but the cell walls were thinner. Lastly, these results will improve the understanding of the property changes of the biomass during pretreatment and will help to develop models for process simulation and potential application of the treated biomass.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA (United States)
Sponsoring Organization:
USDOE
OSTI ID:
1419428
Report Number(s):
NETL-PUB-21616; ENERGA; PII: en11010025
Journal Information:
Energies (Basel), Vol. 11, Issue 1; ISSN 1996-1073
Publisher:
MDPI AGCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

References (35)

Impact of torrefaction on the grindability and fuel characteristics of forest biomass journal January 2011
Influence of torrefaction on the grindability and reactivity of woody biomass journal February 2008
Birch wood particle shrinkage during rapid pyrolysis journal February 2002
Pyrolysis and gasification of a thermally thick wood particle – Effect of fragmentation journal September 2014
Characteristics of hemicellulose, cellulose and lignin pyrolysis journal August 2007
A state-of-the-art review of biomass torrefaction, densification and applications journal April 2015
Shrinkage characteristics of Casuarina wood during devolatilization in a fluidized bed combustor journal February 2006
Pretreatment of biomass by torrefaction and carbonization for coal blend used in pulverized coal injection journal June 2014
High-resolution Thermogravimetric Analysis For Rapid Characterization of Biomass Composition and Selection of Shrub Willow Varieties journal October 2007
Biorefineries: Current activities and future developments journal November 2009
Biochar as a Fuel: 1. Properties and Grindability of Biochars Produced from the Pyrolysis of Mallee Wood under Slow-Heating Conditions journal August 2009
Current technologies for analysis of biomass thermochemical processing: A review journal October 2009
Real-Time and Post-reaction Microscopic Structural Analysis of Biomass Undergoing Pyrolysis journal July 2009
Torrefaction and low-temperature carbonization of woody biomass: Evaluation of fuel characteristics of the products journal September 2012
Calorific value estimation of biomass from their proximate analyses data journal January 2010
Combustion and gasification characteristics of chars from raw and torrefied biomass journal September 2012
An evaluation on improvement of pulverized biomass property for solid fuel through torrefaction journal November 2011
Recent advances in biomass pretreatment – Torrefaction fundamentals and technology journal October 2011
Biomass upgrading by torrefaction for the production of biofuels: A review journal July 2011
More efficient biomass gasification via torrefaction journal December 2006
A review on biomass as a fuel for boilers journal June 2011
Biomass as an energy source in coal co-firing and its feasibility enhancement via pre-treatment techniques journal May 2017
Carbonized wood monoliths—Characterization journal January 1997
A correlation for calculating HHV from proximate analysis of solid fuels journal March 2005
A comparison of thermal behaviors of raw biomass, pyrolytic biochar and their blends with lignite journal October 2013
Production of solid fuel biochar from waste biomass by low temperature pyrolysis journal October 2015
Carbonization of wood for advanced materials applications journal January 1997
Relationships between lignin contents and heating values of biomass journal January 2001
Thermal pretreatment of lignocellulosic biomass journal October 2009
Advantages and disadvantages of composition and properties of biomass in comparison with coal: An overview journal October 2015
Life cycle assessment of biochar cofiring with coal journal March 2013
A study on torrefaction of various biomass materials and its impact on lignocellulosic structure simulated by a thermogravimetry journal June 2010
Structural and chemical modifications of typical South African biomasses during torrefaction journal February 2016
Effect of woody biomass components on air-steam gasification journal January 2005
Energy requirement for fine grinding of torrefied wood journal July 2010

Cited By (2)

Pyrolysis of Grape Marc from Tunisian Wine Industry: Feedstock Characterization, Thermal Degradation and Kinetic Analysis journal March 2018
Waste to Carbon: Estimating the Energy Demand for Production of Carbonized Refuse-Derived Fuel journal October 2019