Characterization of the effect of pyrolysis in torrefied wood chips

L.J.R. Nunes, R. Godina, J.C.O. Matias and J.P.S. Catalão




The pyrolysis behavior of torrefied wood produced in Portugal was investigated. Torrefaction is the thermochemical upgrading of biomass at approximately 300ºC in an atmosphere free of oxidizing agents to increase fuel density and to improve fuel quality, decreasing moisture and increasing heating value. Torrefied woodchips were pyrolysed at pressurized conditions in an inert atmosphere at 600ºC. All the condensable liquids were sampled for analyses. All pyrolysis hydrocarbon liquids were analysed using simulated distillation (simdis) and gas chromatography mass spectrometry (GCMS). Torrefied wood hydrocarbon liquid showed higher concentrations of aliphatic aldehydes liquid. A decrease in all the other molecular components was observed for the torrefied wood hydrocarbon liquid. The main organic components in the torrefied wood pyrolysis water fractions were acids, alcohols and aliphatic oxygenates. Torrefied wood pyrolysis water exhibited a significantly lower acid concentration when compared to nontorrefied wood pyrolysis water. The biomass chars (prepared at 600ºC) were analysed using proximate analyses and carbon dioxide char reactivity. Proximate analyses showed that volatile matter was still present in the torrefied wood, but was almost completely devolatilized after pyrolysis.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ, Nº. 16)
Pages: 516-521 Date of Publication: 2018/04/20
ISSN: 2172-038X Date of Current Version:2018/03/23
REF: 371-18 Issue Date: April 2018
DOI:10.24084/repqj16.371 Publisher: EA4EPQ

Authors and affiliations

L.J.R. Nunes1, R. Godina2, J.C.O. Matias1,2, and J.P.S. Catalão2,3,4
1. GOVCOPP and DEGEIT, University of Aveiro, Aveiro, Portugal
2. C-MAST, University of Beira Interior, Covilhã, Portugal
3. INESC TEC and Faculty of Engineering of the University of Porto, Portugal
4. INESC-ID, Instituto Superior Técnico, University of Lisbon, Portugal

Key words

Pyrolysis, Pyrolysis compounds, Chemical composition, Torrefaction.


[1] P. Srinivasan, A. K. Sarmah, R. Smernik, O. Das, M. Farid, and W. Gao, “A feasibility study of agricultural and sewage
biomass as biochar, bioenergy and biocomposite feedstock: Production, characterization and potential applications,”
Sci. Total Environ., vol. 512–513, no. Supplement C, pp. 495–505, Apr. 2015.
[2] A. V. Bridgwater, “Review of fast pyrolysis of biomass and product upgrading,” Biomass Bioenergy, vol. 38, no.
Supplement C, pp. 68–94, Mar. 2012.
[3] L. J. R. Nunes, J. C. O. Matias, and J. P. S. Catalão, “A review on torrefied biomass pellets as a sustainable alternative to coal in power generation,” Renew. Sustain. Energy Rev., vol. 40, no. Supplement C, pp. 153–160, Dec. 2014.
[4] B. Batidzirai, A. P. R. Mignot, W. B. Schakel, H. M. Junginger, and A. P. C. Faaij, “Biomass torrefaction technology: Techno-economic status and future prospects,” Energy, vol. 62, no. Supplement C, pp. 196–214, Dec. 2013.
[5] D. Agar and M. Wihersaari, “Torrefaction technology for solid fuel production,” GCB Bioenergy, vol. 4, no. 5, pp.
475–478, Sep. 2012.
[6] M. Gräbner, Industrial Coal Gasification Technologies Covering Baseline and High-Ash Coal. John Wiley & Sons, 2014.
[7] L. Roets, J. R. Bunt, H. W. J. P. Neomagus, and D. van Niekerk, “An evaluation of a new automated duplicatesample
Fischer Assay setup according to ISO/ASTM standards and analysis of the tar fraction,” J. Anal. Appl. Pyrolysis, vol. 106, pp. 190–196, Mar. 2014.
[8] Y. Jiao et al., “In situ catalyzed Boudouard reaction of coal char for solid oxide-based carbon fuel cells with improved performance,” Appl. Energy, vol. 141, no. Supplement C, pp. 200–208, Mar. 2015.
[9] B. g. del-Campo, M. d. Morris, D. a. Laird, M. m. Kieffer, and R. c. Brown, “Optimizing the production of activated
carbon from fast pyrolysis char,” TECHNOLOGY, vol. 3, no. 02n03, pp. 104–113, Jun. 2015.
[10] G.-G. Choi, S.-J. Oh, S.-J. Lee, and J.-S. Kim, “Production of bio-based phenolic resin and activated carbon from bio-oil and biochar derived from fast pyrolysis of palm kernel shells,” Bioresour. Technol., vol. 178, no. Supplement C, pp. 99–107, Feb. 2015.
[11] C. Guizani, F. J. Escudero Sanz, and S. Salvador, “Effects of CO2 on biomass fast pyrolysis: Reaction rate, gas
yields and char reactive properties,” Fuel, vol. 116, no. Supplement C, pp. 310–320, Jan. 2014.
[12] J. Alvarez, G. Lopez, M. Amutio, J. Bilbao, and M. Olazar, “Upgrading the rice husk char obtained by flash pyrolysis for the production of amorphous silica and high quality activated carbon,” Bioresour. Technol., vol. 170, no. Supplement C, pp. 132–137, Oct. 2014.
[13] A. J. Forney and W. P. Haynes, “Clean Fluid Fuels From Coal and Wastes,” J. Eng. Power, vol. 95, no. 3, pp. 142–
144, Jul. 1973.
[14] A. Cabeza, C. M. Piqueras, F. Sobrón, and J. García-Serna, “Modeling of biomass fractionation in a lab-scale
biorefinery: Solubilization of hemicellulose and cellulose from holm oak wood using subcritical water,” Bioresour.
Technol., vol. 200, pp. 90–102, Jan. 2016.
[15] N. Y. Harun and M. T. Afzal, “Torrefaction of Agriculture and Forestry Biomass Using TGA-FTIRMS,” in Progress in Exergy, Energy, and the Environment, Springer, Cham, 2014, pp. 805–813.
[16] A. J. Ashworth, S. S. Sadaka, F. L. Allen, M. A. Sharara, and P. D. Keyser, “Influence of Pyrolysis Temperature and Production Conditions on Switchgrass Biochar for Use as a Soil Amendment,” BioResources, vol. 9, no. 4, pp. 7622–7635, Oct. 2014.
[17] S. S. Vincent, N. Mahinpey, and A. Aqsha, “Mass transfer studies during CO2 gasification of torrefied and pyrolyzed chars,” Energy, vol. 67, no. Supplement C, pp. 319–327, Apr. 2014.
[18] L. Roets, C. A. Strydom, J. R. Bunt, H. W. J. P. Neomagus, and D. van Niekerk, “The effect of acid washing on the pyrolysis products derived from a vitrinite-rich bituminous coal,” J. Anal. Appl. Pyrolysis, vol. 116, no. Supplement C, pp. 142–151, Nov. 2015.