Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 88, Issue 2, Pages 117-123Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2010.03.004
Keywords
Agricultural residues; Pyrolysis; FTIR; Gases
Funding
- National Natural Science Foundation of China (NSFC) [50776037, 50721005]
- Program for New Century Excellent Talents in University [NCEF-07-0335]
- Major State Basic Research Development Program of China [2004CB217704]
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Pyrolysis of agricultural residues (maize stalk, rice straw and cotton straw) was studied using a thermogravimetric (TG) analyzer and a laboratory scale fixed bed coupled with Fourier transform infrared (FTIR) analyzer. Pyrolysis characteristics of three materials were discussed. The characteristic parameters were determined for the main devolatilization step. Maize stalk showed the highest thermal reactivity, followed by cotton straw and rice straw. Their pyrolysis processes underwent three consecutive stages, corresponding to the evaporation of water, the formation of primary volatiles and the subsequent release of small molecular gases. In order to further study the pyrolysis mechanisms of agricultural wastes, the release of the main volatile and gaseous products were on-line detected by FTIR spectroscopy. The results showed that the major pyrolysis gases for the three materials were similar, including CO(2), CO, methane, ethane, ethylene and some organics such as methanol, formaldehyde, formic acid and acetone. HCN was the major nitrogen containing product. At higher temperatures several small molecular gases, such as CO(2), CO and methane, could still be monitored. (C) 2010 Elsevier B.V. All rights reserved.
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