部分氧化对焦油模型化合物苯酚转化的机理

Reaction mechanism for partial oxidation of biomass tar

基于Richter等提出的碳氢化合物燃烧的详细反应机理,结合生物质气化焦油的部分氧化脱除方法,建立了生物质部分氧化的详细反应机理.与Jess的实验比较,验证了模型的准确性.计算了以苯酚为焦油模型化合物在过量空气系数ER=0～0.2条件下的转化,表明氧气的加入提高了焦油的转化率和反应速率.适量的氧气能提高部分氧化的可燃气体的产率.基于ROP分析得到典型PAHs的生成率,结果表明环戊二烯基对于PAHs的形成和成长有重要的促进作用,活性OH和H自由基在焦油裂解为小分子过程中起主要作用.

By combining the detailed reaction mechanism proposed by Richter et al. for hydrocarbon combustion and the removal methods of tar oil from biomass gasification by partial oxidation, a detailed reaction mechanism was put forward for partial oxidation of biomass tar. A comparison with the experiment results obtained by Jess confirmed the modePs rationality and accuracy. Phenol that was chosen as a model component for biomass tar was converted i. e. partial combustion at condition of ER=0-0.2. The results show that oxygen can promote conversion of tar oil and its reaction rate, and proper oxygen content leads to higher production of combustible gases. Based on typical PAHs production rates obtained by ROP analysis it is found that cyclopentadiene plays an important role in the formation and growing of PAHs and active radicals such as H and OH promote tar cracking.