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采用同步辐射真空紫外光电离质谱技术作为测量手段,对正庚烷/甲醇/氧气/氩气富燃低压层流预混火焰进行了实验和模拟研究。结合文献记载的正庚烷火焰,针对包括苯及苯的前驱体在内的物质开展了对比研究。结果表明,甲醇的加入加快了整体燃烧进程,使得大多数中间物质最大摩尔分数降低,其出现的位置提前。随着脱氢裂解反应的深入,处于反应链下游的物质受甲醇加入的影响较小。苯的C_4前驱体相比于C_3前驱体受到甲醇的加入影响大,由物质生成率分析可知,火焰中苯的生成路径以C_4+C_2为主。
Synchrotron radiation vacuum ultraviolet photoionization mass spectrometry was used as a measuring method to experiment and simulate the premixed flames of n-heptane / methanol / oxygen / argon rich and low pressure laminar flow. In combination with the documented n-heptane flame, a comparative study of substances including benzene and benzene precursors was conducted. The results show that the addition of methanol accelerates the whole combustion process, leading to the decrease of the maximum molar fraction of most intermediate materials and the advancement of its occurrence. With the deepening of the dehydrocracking reaction, the material located in the downstream of the reaction chain is less affected by the addition of methanol. The C_4 precursor of benzene is more affected by the addition of methanol than the precursor of C_3, and the formation of benzene in the flame is mainly dominated by C_4 + C_2.