生物油TG-FTIR分析与热解气化特性研究

TG-FTIR analysis of bio-oil and its pyrolysis/gasification property

以稻壳快速热解产物生物油为对象,在对其进行热重红外检测的基础上,结合生物油及其轻质、重质组分的热解气化实验,研究了生物油热解气化过程及气体产出特性。结果表明,生物油的热解气化分为两个阶段,一是轻质组分的快速挥发热解;二是重质组分的裂解气化与缩合缩聚,活化能分别为35～38 kJ/mol和15～22 kJ/mol。温度升高,热解气化效率增加,以H2和CO为主的合成气产量增多,但气体产物热值降低。气体中H2主要来自轻质组分的热解气化,而重质组分则裂解产生较多的CO、CH4等物质。

The process of bio-oil pyrolysis/gasification and gas evolution characteristic was studied using a thermogravimetric analyzer coupled with Fourier transform infrared spectroscopy（TG-FTIR）.Pyrolysis/gasification of bio-oil and its fractions were also performed in a fixed bed.As a result,the process of bio-oil pyrolysis/gasification can be divided into two stages.The first is volatilization and pyrolysis of the light compounds at low temperature and the second is cracking and polymerization of the heavy compounds at high temperature.The values of activation energy are 35~38 kJ/mol in the first stage and 15~22 kJ/mol in the second stage,respectively.With temperature increasing,the conversation of pyrolysis/gasification grows higher and the yield of synthesis gas（syngas） increases.However,the calorific value of the gas has an inverse correlation with the temperature.In comparison,the light fraction（LF） makes more contribution to the overall H2 release;while CO and CH4 are mainly generated from the heavy fraction（HF）.