Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 104, Issue -, Pages 551-558Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2013.05.014
Keywords
Waste wood; Pyrolysis; Char; Activated carbon; Combustion; Fuel properties
Funding
- Centre for Industrial Technological Development of Spain (CDTI) [IDI-20100873]
- ENRECO Ltd.
- CSIC [JAEDoc-09-00893]
- FSE Operational Programme (Multiregional Adaptability and Employment)
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Chars were obtained by the pyrolysis of waste wood samples of different origin - silver fir (Abies alba), holm oak (Quercus ilex), stone pine (Pinus pinea) and Pyrenean oak (Quercus pyrenaica) - at 600 C in a pilot scale installation. The thermo-chemical characteristics of the resulting materials were fully investigated using a combination of standard techniques. The char yield ranged from 23 wt% to 29 wt%, depending on the precursor wood. The recovery of C achieved was 42-51 wt%, increasing with the hemicellulose content of the wood. In addition, the chars had low volatile matter (8-12 wt%) and ash (2.0-8.5 wt%) contents. The higher heating values of the chars were relatively high (31-35 MJ kg(-1)) and comparable to that of a semi-anthracite (silver fir and stone pine chars) or medium-volatile bituminous coal (holm and Pyrenean oak chars). Their combustion intervals, and ignition, volatilization and burnout temperatures, were similar to those of commercial coals. The chars had a microporous structure (pore size <2 nm) with BET surface areas in the range 314-405 m(2) g(-1). Their treatment by CO2 at 800 degrees C resulted in activated carbons with pore sizes below 0.89 nm and BET surface areas of 543-815 m(2) g(-1). (C) 2013 Elsevier B.V. All rights reserved.
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