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针对生物质气化再燃技术路线中焦油的价值及利用开展研究。通过热重-质谱联用仪分析典型农业废弃物在热解、气化过程中焦油组分的析出情况,并在管式流动实验台上研究焦油在生物质气化气还原NO中的作用以及焦油还原NO受当量比、温度等因素的影响规律,最后建立了甲苯还原NO的机制模型,并以停流动实验台的实验结果进行了验证。结果表明:苯、甲苯、苯乙烯和苯酚是具有代表性的焦油组分;焦油对生物质气化气还原NO有积极的作用;焦油组分还原NO存在最佳的当量比,并要求合适的温度窗口,需要关注聚合反应;甲苯还原NO机制(NO reduction by toluene,NRT)模型与实验结果拟合良好,模型的生成速率和消耗速率分析显示HCCO和C2H在焦油还原NO中具有重要作用。
Research on the Value and Utilization of Tar in Biomass Gasification Reburning Technology. The precipitation of tar components in typical agricultural wastes during pyrolysis and gasification was analyzed by TG-MS, and the effect of tar on reduction of NO by biomass gasification was also studied on a tubular flow test bench. NO reduction by tar is affected by the equivalence ratio, temperature and other factors. Finally, a mechanism model for the reduction of NO by toluene is established and verified by the experimental results of the stop-flow test bench. The results showed that benzene, toluene, styrene and phenol were representative tar components; tar had a positive effect on the reduction of NO by biomass gasification; the optimum equivalence ratio of tar reduction was NO, and the suitable The temperature window requires attention to the polymerization reaction. The NO reduction by toluene (NRT) model fits well with the experimental results. The analysis of the formation rate and the consumption rate shows that HCCO and C2H play an important role in tar reduction of NO.