掺氢对生物燃气燃烧的影响研究

为了研究掺氢对生物燃气燃烧特性的内在影响规律，本文开展了生物燃气掺氢层流燃烧的实验和CHEMKIN仿真研究。实验结果表明，当量比一定时，火焰燃烧速度随着掺氢比的增大而增大；大当量比情况下，随着掺氢比的增大，燃烧速度的增大尤为明显。仿真结果表明，掺氢后H和OH的摩尔分数变化较大。利用反应产物生成速率（ROP）分析法对掺氢燃烧过程的化学反应路径进行分析发现，由于H2浓度对基元反应O + H2 = H + OH及OH + H2 = H + H2O的影响显著，导致后续关键基元反应中H和OH的生成和消耗情况发生变化，特别是掺氢浓度较大时，将造成H的大量增加，同时OH也有一定增加，从而导致预混燃烧速度的显著增大。

Effect of Hydrogen Addition on Biogas Combustion

To study the effect of hydrogen addition on biogas combustion, experiment and CHEMKIN simulation of the gas mixture combustion were conducted. The experiment shows that the burning velocity of the gas mixture gets higher with the increase of hydrogen addition at a constant equivalence ratio, and the aggrandizement is more obvious with larger equivalence ratio. The simulation shows that the mole fractions of H and OH grow up with the hydrogen addition. The chemical reaction paths of the mixing hydrogen combustion process were analyzed by rate of production (ROP). The results show that H2 affects a lot to the elementary reactions O + H2 = H + OH and OH + H2 = H + H2O. It changes the formation and consumption of H and OH in subsequent reaction, and the H and OH are rapidly accumulated especially in high percentage of hydrogen addition. The rate of premixed combustion was therefore accelerated obviously.