油棕废弃物及生物质三组分的热解动力学研究

主要利用热重分析仪(TG)对油棕废弃物和生物质的三组分(半纤维素,纤维素和木质素)的热解特性进行了系统研究,对比分析了热解特性,计算了其热解动力学参数,并研究了升温速率对生物质热解特性的影响。研究发现半纤维素和纤维素易于热降解而木质素难于热解;油棕废弃物的热解可以化分为:干燥、半纤维素热解、纤维素热解和木质素热解4个阶段;生物质的热解反应主要是一级反应,油棕废弃物的活化能很低,约为60kJ/kg;升温速率对生物质影响很大,随升温速率加快,生物质热解温度升高,热解速率降低。

THERMODYNAMIC ANALYSIS OF PYROLYSIS OF PALM OIL WASTES AND BIOMASS COMPONENTS

The investigation of the pyrolysis of palm oil wastes and the biomass components(hemicellulose,cellulose and lignin)were preformed by thermogravimetfic analyzer(TGA),and their thermodynamic parameters were calculated using non-isothermal integrated method;simultaneously,the influence of heating rate on biomass pyrolysis property was ana- lyzed.The result showed that hemicellulose and cellulose pyrolyzed easily,whereas lignin was difficult to decompose. The pyrolysis process of palm oil wastes can be divided into 4 stages:moisture evolving,hemicellulose decomposition, cellulose decomposition and lignin decomposition.The pyrolysis of biomass mainly followed the first order reaction,and the activation energy of palm oil wastes samples is very low(60kJ/kg).Heating rate displays a great influence on biomass pyrolysis.With heating rate increase,biomass pyrolysis was shift to higher temperature.The study is significant for the high efficiency utilization of palm oil wastes as energy resourees.