Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Science, Guangzhou 510640, PR China.
Bioresour Technol. 2013 Jan;128:370-7. doi: 10.1016/j.biortech.2012.10.067. Epub 2012 Oct 23.
Pretreatment of corncobs using torrefaction was conducted in an auger reactor at 250-300 °C and residence times of 10-60 min. The torrefied corncobs were fast pyrolyzed in a bubbling fluidized bed reactor at 470 °C 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 (13)C 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.
采用螺旋反应器在 250-300°C 和 10-60min 的停留时间下对玉米芯进行预处理。将预处理后的玉米芯在 470°C 的鼓泡流化床反应器中快速热解，以获得高质量的生物油。应用热预处理后，生物油的热值和 pH 值提高；然而，随着热解程度的增加，生物油产率的降低。傅里叶变换红外光谱（FTIR）和定量固体（13）C 核磁共振谱（NMR）分析表明，热解过程中玉米芯的挥发、交联和焦化可能是导致生物油产率降低的原因。气相色谱-质谱联用（GC-MS）分析表明，生物油中的乙酸和糠醛含量随热解温度或停留时间的增加而降低。结果表明，如果能够限制生物质的交联和焦化，热解是一种有效的预处理方法，可以提高生物油的质量。
