原位汽化固定床反应器设计与试验

Design and experiment of in situ vaporization fixed-bed reactor

生物油具有含氧量高、酸性强、稳定性差、热值低、成分复杂等缺点,为了对生物油进行提质处理,基于原位汽化策略设计了一种固定床反应器,采用浸渍法制备Ni基催化剂,以气体产率、碳转化率、氢气选择性为主要评价指标,探究3种废弃秸秆热解生物油的催化重整制氢效果。利用烟气分析仪检测的实时数据,计算出玉米、茄子、辣椒秸秆热解生物油的产氢率分别为38%、40%、33%;通过扫描电镜联合能谱(SEM)分析发现,表面碳沉积导致催化剂逐渐失活及催化重整制氢能力减弱。原位汽化固定床反应器设计合理、性能可靠,改进优化了生物油重整制氢生产工艺,提高了产氢效率,有利于生物质热解液化产物的高值利用。

Bio-oil has many disadvantages such as high oxygen content,strong acidity,poor stability,low calorific value and complex composition.In order to improve the quality of bio-oil,a fixed-bed reactor was designed based on the in situ vaporization strategy.Ni-based catalysts were prepared by impregnation method.The hydrogen production effect of three kinds of waste straw pyrolysis bio-oil was studied by catalytic reforming with gas yield,carbon conversion rate and hydrogen selectivity as the main evaluation indexes.Based on the real-time data of flue gas analyzer,the hydrogen production rates of corn,eggplant and pepper straw pyrolysis bio-oil were calculated to be 38%,40%and 33%,respectively.By SEM combined with energy spectrum analysis,it was found that surface carbon deposition resulted in gradual deactivation of catalyst and weakened hydrogen production capacity of catalytic reforming.The in-situ vaporization fixed-bed reactor,with reasonable design and reliable performance,improved and optimized the hydrogen production process of bio-oil reforming,improved the hydrogen production efficiency,and was conducive to the high value utilization of biomass pyrolysis and liquefaction products.