Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 17, Pages 8211-8219Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.05.083
Keywords
Agricultural residues; Pyrolysis; Gas; Char
Funding
- National Natural Science Foundation of China [51006065, 50876056]
- National High Technology Research and Development of China [2009AA 05Z401]
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The gases and chars produced during fast pyrolysis of maize stalk, rice straw, cotton straw and rice husk at temperatures ranging from 600 to 1000 degrees C were studied by Fourier transform infrared spectroscopy, non-dispersive infrared technique, thermal conductivity detection method, ultimate analysis. X-ray diffraction, helium density measurement and N-2 adsorption method. The gas yield increased by more than 80% from 600 to 1000 degrees C, while the char and liquid yield decreased. The content of CO2, CO and CH4 accounted for more than 86%. The CO and CH4 content increased with temperature, while the CO2 content decreased. The hydroxyl, aliphatic C-H, carbonyl, olefinic C=C and ether groups were lost above 800 degrees C. Carbon skeleton shrinkage increased by more than 23% when the temperature increased from 600 to 1000 degrees C. Maximum porosity appeared at 900 degrees C. This study revealed the relationships between gas composition/char properties and pyrolysis temperature under high heating rate conditions. (C) 2011 Elsevier Ltd. All rights reserved.
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