Calorific Power Improvement of Wood by Heat Treatment and Its Relation to Chemical Composition

Idalina Domingos, Umit Ayata, José Ferreira, Luisa Cruz-Lopes, Ali Sen, Sirri Sahin and Bruno Esteves
Additional contact information
Idalina Domingos: Department of Wood Engineering and CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, Portugal
Umit Ayata: Department of Interior Architecture and Environmental Design, Faculty of Arts and Design, Bayburt University, Bayburt 69000, Turkey
José Ferreira: Department of Wood Engineering and CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, Portugal
Luisa Cruz-Lopes: Department of Environmental Engineering and CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, Portugal
Ali Sen: School of Agriculture, Forest Research Centre, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal
Sirri Sahin: Department of Agricultural Buildings and Irrigation, Agriculture Faculty, Ataturk University, Erzurum 25240, Turkey
Bruno Esteves: Department of Wood Engineering and CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, Portugal

Energies, 2020, vol. 13, issue 20, 1-10

Abstract: Chemical composition influences the calorific power of wood, mainly due to the calorific power of structural compounds and extractives. Heat treatment changes the chemical composition of treated wood. This work studies the relationship between chemical composition and calorific power improvement by heat treatment. Samples were heat-treated by the ThermoWood process ® for 1 h and 2 h. High heating value (HHV) and chemical composition; lignin, cellulose, hemicelluloses and extractives in dichloromethane, ethanol, and water were determined. The HHV of untreated wood ranged between 18.54–19.92 MJ/kg and increased with heat treatment for all the tested species. A positive linear correlation was found between HHV and Klason lignin (R 2 = 0.60). A negative trend was observed for holocellulose, cellulose, and hemicelluloses content against HHV, but with low determination coefficients for linear regression. The best adjust for polysaccharides was found for hemicelluloses content. A positive correlation could be found for dichloromethane extractives (R 2 = 0.04). The same was obtained in relation to ethanol extractives with R 2 = 0.20. For water and total extractives, no clear positive or negative trends could be achieved. The results showed that the HHV of wood increased with heat treatment and that this increase was mainly due to the increase in lignin content.

Keywords: calorific power; chemical composition; correlations; heat treatment (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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