摘要
利用固定床反应器对稻壳进行热解实验,研究操作条件及金属盐催化剂对稻壳热解生物油的影响规律。结果表明,稻壳单独热解时,在热解终温550℃、升温速率20℃×min^(-1)的条件下,生物油产率最高为53.81%。Na_2CO_3和CaCO_3两种催化剂均能提高生物油的产率和品质,但Na_2CO_3的催化效果优于CaCO_3。随着两种催化剂添加量的增加,生物油产率增加幅度逐渐减小,在Na_2CO_3和CaCO_3添加量为2.5%(wt)时,生物油产率分别可达到60.92%和57.67%。随着Na_2CO_3添加量的提高生物油酸值减小和热值增加的幅度均增大;CaCO_3则使得生物油酸值减小幅度先下降后升高,而热值增加幅度较小。GC-MS对生物油组成进行分析可知,催化剂的添加改变了生物油的组成,促进了生物油中酚类、醇类和芳烃类化合物的生成,抑制了酸类和糖类化合物的产生。
A fixed-bed reactor was used for rice husk pyrolysis and the effects of operating conditions and catalysts on bio-oil production were studied. The results show that the maximum bio-oil yield is 53.81% without catalysts at 550℃ under 20℃×min^-1. The presence of Na2CO3 and CaCO3 can increase bio-oil yield and improve bio-oil quality, and Na2CO3 shows better performance than that of CaCO3. With the increase of catalyst percentage, the increasing rate of bio-oil yield decreases. The bio-oil yields are 60.92% or 57.67% when 2.5%（wt） Na2CO3 or CaCO3 is added. The acid value decreasing rate and the calorific value increasing rate both increase with the increase of Na2CO3. However, the increase of CaCO3 has a different effect, which shows that the acid value decreasing rate has a minimum peak and the calorific value increasing rate is less affected. The bio-oil composition was analyzed by GC-MS, which indicates that the addition of catalysts changes the composition. Phenols, alcohols and aromatic compounds increase, while acids and sugars decrease.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2016年第3期604-610,共7页
Journal of Chemical Engineering of Chinese Universities
基金
福建省科技计划重点项目(2013Y0065)
泉州市科技计划重点项目(2013Z25)
关键词
固定床
稻壳
热解
催化剂
生物油
fixed bed reactor
rice husk
pyrolysis
catalyst
bio-oil
