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题名	生物油及其重质组分的热解实验研究; The Study on Pyrolysis Characteristics of Bio-oil and its Heavy Fractions
作者	武景丽
学位类别	硕士
答辩日期	2008-06-03
授予单位	中国科学院广州能源研究所
授予地点	广州能源研究所
导师	吴创之
关键词	生物油 重质组 模型化合物 热重红外联用 热解
其他题名	The Study on Pyrolysis Characteristics of Bio-oil and its Heavy Fractions
中文摘要	Bio-oil，the only liquid product in fast pyrolysis process of biomass has been expected to be very promising in the future, and the technique of pyrolysis of bio-oil has also been attracted considerable attention in the field of thermal chemical conversion recently. Bio-oil is the complex mixture in the process of depolymerization of lignin, cellulose and hemicellulose under non-thermodynamic equilibrium conditions, and it can only be treated as primary liquid fuel not only because of its high oxygen content, viscosity, but also the corrosivity and low calorific value. Many researches have focused on bio-oil’s applications and further treatments. Hydrogenation and catalytic cracking has been attracted much attention in upgrading bio-oil, It’s been found out that heavy component of bio-oil is difficult to crack in the above two cases and in reforming. For the purpose of improving efficiency of bio-oil exploitation and achieving better solutions to problems occurred during bio-oil pyrolysis and gasification ,as well as providing necessary data for the design of pyrolysis and gasification equipments, the physicochemical properties analysis of bio-oil produced from wood powder by self-heating biomass fast pyrolysis facility was carried out initially. Then TG, TG-FTIR and tube furnace were employed to investigate pyrolysis characteristics of bio-oil and model compounds of its heavy fractions. Finally, the design of a domestic entrained-flow reactor is introduced for improving efficiency of bio-oil utilization. The thermogravimetric analysis of bio-oil and model compounds of its heavy fractions were carried out under high purify N2 atmosphere from room temperature to a maximum temperature of 930℃ with different heating rates(10℃/min～30℃/min). The results indicated that bio-oil pyrolysis occured in 2 steps. The evaporation of low-boiling point compounds occurred in the first stage,, followed by the cracking of heavy fractions. With increasing heating rate, the starting temperature of weight loss, the maximum velocity of weight loss and its corresponding temperature increased simultaneity; but no difference among the ultimate weight losses was observed. The evolving volatile products during the pyrolysis process were analyzed by FTIR, and the results indicated that: free water, released during the primary stage of bio-oil pyrolysis, flowed by acids, alcohols, aldehydes and ketones due to their low boiling point. The final products were mainly consisted of H2O and CO2 due to cracking of bio-oil heavy fractions. For the model compounds of heavy fractions of bio-oil, the online analysis showed that hydroxybenzenes had the greatest tendency to decompose, followed by aldehydes and carbohydrate. Levoglucosan pyrolysis occurred in two steps: First, it was dehydrated into small molecules such as aldehydes; and then followed by the cracking of aldehydes. Enhancing heavy fractions cracking such as carbohydrates pyrolysis plays an important role in improving efficiency of bio-oil usage. Pyrolysis of bio-oil and its model compounds of heavy fractions in tube furnace was carried out over a temperature range of 700～1000℃ under inert atmosphere. The composition and yield of the derived gases as well as distribution of the pyrolyzed product were determined. It is found that with increasing temperature the gas yield goes up. The gaseous product mainly consists of H2, CO, CO2 and hydrocarbons such as CH4、C2H4、C2H6. The heating value of eugenol is in the range of 22.7～24.4MJ/Nm3, and that of bio-oil is in the range of 22.7～24.4MJ/Nm3.
语种	中文
公开日期	2011-07-14 ; 2011-07-15
页码	52
内容类型	学位论文
源URL	[http://ir.giec.ac.cn/handle/344007/5790]
专题	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	武景丽. 生物油及其重质组分的热解实验研究, The Study on Pyrolysis Characteristics of Bio-oil and its Heavy Fractions[D]. 广州能源研究所. 中国科学院广州能源研究所. 2008.

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