摘要
利用绝热加速量热仪（ARC）进行多种生物质及生物质组分的慢速热解,检测热解过程的吸放热情况,结果显示在缓慢升温过程中,纤维素的放热峰在256.2 ～279.2℃之间,放热量约为673.9J/g,质量分数为51.8％固体炭产物；而木聚糖在219.8～253.7℃之间有一尖锐的放热峰,放出热量约为873.3 J/g,得到质量分数为68.7％的残余固体；木质素的热流曲线却在133.3～292.2℃有吸热趋势,吸收热量为340.1 J/g,得到质量分数为80.4％的固体炭.各生物质的热流曲线中均有两个相连的放热峰出现,分别来源于半纤维素和纤维素.各生物质热流曲线特征值各异,但起始放热温度在190℃前后,第1个峰值温度在220℃左右,第2个放热峰峰值集中在255℃前后.
Accelerating Rate Calorimeter （ARC） has been utilized to investigate biomass components and several types of biomass pyrolysis. The results showed that, pyrolysis under constant input power, cellulose had a exothermic peak in the range of 256.2- 279.2 ℃ and generated heat 673.9 J/g. The residue yield was 51.8%. Xylan also had a sharp exothermic peak at 219.8- 253.7 ℃, released heat 873.3 J/g. The residue yield was 68.7%. The heat flow curve of lignin pyrolysis showed a endothermic trend between 133.3-292.2 ℃ and absorbed heat 340.1 J/g. The residue yield was 80.4%. During biomass pyrolysis, two consequent exothermic peaks have been found in the heat flow curves. These two peaks are caused by hemicellulose and cellulose pyrolysis respectively. The endothermic trend of lignin has also been detected as well. Each biomass has released different amount of heat, but the initial heat releasing temperature is around 190 ℃. Thefirst peak temperature is around 220 ℃ and the second peak is concentrated at around 255 ℃.
出处
《生物质化学工程》
CAS
2013年第5期23-29,共7页
Biomass Chemical Engineering
基金
国家自然科学基金资助项目(31100521)
中国林科院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2011010)
关键词
纤维素
半纤维素
木质素
热解
放热
吸热
cellulose
hemicellulose
lignin
pyrolysis
exothermic
endothermic
