摘要
为探究烟气中氧浓度对生物质烘焙过程的影响,以麦秆为研究对象,在固定床反应器上进行温度及氧浓度下的烘焙实验。研究结果表明:随着氧浓度的增大,烘焙过程可分为3个阶段:氧浓度较低时(<6%),主要为半纤维素的脱羧基和羰基化反应以及综纤维素的缓慢氧化;随着氧浓度的增加(>6%),氧化反应加剧;当氧浓度>10%时,氧化反应导致局部热量堆积,出现挥发分燃烧现象。烟气烘焙耐受氧浓度为6%,此时质量和能量产率分别保持在60%和70%之上。
The combustion flue gas from the burner can be efficiently used in biomass torrefaction. In order to understand the influence of oxygen concentration of flue gas on biomass torrefaction, the wheat straw was taken as the experiment object to carry out torrefaction experiment in the fixed-bed reactor under different oxygen concentration and temperature. The results show that the presence of oxygen has appreciable effect on biomass torrefaetion, the influence can be divided into three stages with the increasing of oxygen concentration. When the oxygen concentration is lower than 6%, the weight loss is mainly due to the decarboxylation and hydroformylation of hemicellulose and the slow oxidation of holocellulose. With the increasing of oxygen concentration （〉6%）, the oxidation becomes violent. When the oxygen concentration exceeds 10%, the volatile combustion phenomena appear due to the local heat accumulation resulted from the oxidation. The mass and energy yield of solid product are above 60% and 70%, respectively when the tolerate oxygen concentration of flue gas torrefaction is 6%.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2016年第8期2154-2159,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51306067)
湖北省自然科学基金(2013CFB179)
华中科技大学自主创新研究基金(2013NY024)
关键词
烘焙
氧浓度
麦秆
燃烧
torrefaction
oxygen concentration
wheat straw
combustion
