摘要
在1 kg/h的小型鼓泡流化床热解反应装置中增设一热过滤装置,对杉木快速热解制取生物油进行了研究,考察了热过滤装置对生物油产率和品质的影响。结果表明：热解油（未经热过滤）和过滤油（经过热过滤）的产率随热解温度的升高先上升后下降,并都在475℃时达到最大值,分别为58.1%和50.7%。热过滤装置的引入降低了生物油的产率（下降5%~10%）,且热解温度越高,过滤油产率下降越明显。相比于热解油Ⅰ,过滤油Ⅰ的含水率从13.77%增加到15.83%,p H值从2.18上升到2.23,热值由20.47 MJ/kg降低到19.53 MJ/kg,但固体含量、碱金属和碱土金属均有显著下降,总体下降约75%,减少了生物油中自聚反应的发生。在老化实验过程中,过滤油Ⅰ的含水率、黏度分别增加了10.2%和57.6%,但较热解油Ⅰ变化幅度小;通过GC-MS分析其组成变化,发现过滤油Ⅰ中各组分含量变化幅度较热解油Ⅰ小,表明热过滤使其中不利反应的发生得到了抑制,稳定性较好,显示出热过滤装置对生物油品质提升的良好促进作用,有利于生物油的储存、运输和使用。
A hot filter was added to a 1 kg / h bench-scale continuous bubbling fluidized bed system for the fast pyrolysis of Chinese fir to get bio-oils. The effects of hot filter on the yield and stability of bio-oils were studied. The results indicated that both the yields of pyrolysis oil（ without hot filtration） and filtered oil（ after hot filtration） increased with the increase of pyrolysis temperature,and decreased after 475 ℃,at which the maximum yields were 58. 1% and 50. 7%,respectively. The addition of hot filter resulted in lower oil yield（ approximate 5%- 10% decrease）,which became worse when pyrolysis temperature increased.Compared to the pyrolysis-oil Ⅰ,the water content of filtered-oil Ⅰ increased from 13. 77% to 15. 83%,p H value increased from2. 18 to 2. 23,and high-heating value decreased from 20. 47 MJ / kg to 19. 53 MJ / kg. However,it also showed significant reduction in solids contents,alkali and alkaline earth metals,and the overall decline was about 75%,which suppressed the happening of self-polymerization in bio-oils. During the aging tests,water content and kinematic viscosity of filtered-oil Ⅰ increased by 10. 2%and 57. 6%,but the fluctuation was less than that of pyrolysis-oil Ⅰ. GC / MS analysis of the bio-oils showed that less fluctuation in composition was observed in the filtered-oil Ⅰ. This indicated a positive impact of the hot filter on the quality of bio-oil.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2015年第3期13-19,共7页
Chemistry and Industry of Forest Products
基金
国家'973'资助项目子课题(2012CB215306)
关键词
快速热解
热过滤
生物油
老化
fast pyrolysis
hot filtration
bio-oil
aging test
