Effect of torrefaction on structure and fast pyrolysis behavior of corncobs

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• 作者：Anqing Zheng ; Zengli Zhao ; ^{zhaozl@ms.giec.ac.cn} ; Sheng Chang ; Zhen Huang ; Xiaobo Wang ; Fang He ; Haibin Li
• 关键词：Torrefaction ; Fast pyrolysis ; Bio-oil ; 13C NMR ; Pyrolysis mechanism
• 刊名：Bioresource Technology
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：128
• 期：Complete
• 页码：370-377
• 全文大小：758 K

文摘

Pretreatment of corncobs using torrefaction was conducted in an auger reactor at 250-300 ¡ãC and residence times of 10-60 min. The torrefied corncobs were fast pyrolyzed in a bubbling fluidized bed reactor at 470 ¡ãC to obtain high-quality bio-oil. The heating value and pH of the bio-oil improved when the torrefaction as pretreatment was applied; however, increasing bio-oil yield penalties were observed with increasing torrefaction severity. Fourier transform infrared Spectroscopy (FTIR) and quantitative solid ¹³C nuclear magnetic resonance spectrometry (NMR) analysis of torrefied corncobs showed that the devolatilization, crosslinking and charring of corncobs during torrefaction could be responsible for the bio-oil yield penalties. Gas chromatography-mass spectrometry (GC-MS) analysis showed that the acetic acid and furfural contents of the bio-oil decreased with torrefaction temperature or residence time. The results showed that torrefaction is an effective method of pretreatment for improving bio-oil quality if the crosslinking and charring of biomass can be restricted.