高压下不同n(H2)∶n(CO)合成气燃烧的NO生成机理

NO Formation in Syngas Coflow Diffusion Flame with Different n(H_2):n(CO) at Elevated Pressure

针对H_2/CO合成气同向扩散火焰展开研究,考察了合成气燃烧生成NO的情况,使用Fluent软件对燃烧实验进行了1∶1的数值模拟研究.耦合了详细化学动力学模型以考察燃烧过程中的NO生成机理,研究不同压力与不同n(H_2)∶n(CO)比条件下合成气燃烧特性与污染物排放特性,为实际燃烧设备的设计和优化提供理论指导.结果表明,随着压力的增加,H_2/CO合成气同向扩散火焰的峰值温度单调增加,压力越高增加趋势越平缓.同时主要的污染物NO生成量也随着压力的增加而显著增加,其中热力型NO占主导地位.此外,随着H_2/CO合成气同向扩散火焰中氢气体积分数的增加,合成气同向火焰中产生的NO污染物和火焰峰值温度也有明显的增加.

The experimental research and theoretical analysis on the pollution formation of n(H_2)∶n(CO)syngas coflow diffusion flame was carried out.The numerical work was done by Fluent coupled with detailed reaction mechanism.The formation route of NO was investigated.In order to provide guidance for the design and optimization of combustion equipment,the pollution formation during combustion of syngas with different n(H_2)∶n(CO)at different pressure was studied.The results show that the peak flame temperature of H_2/CO syngas coflow diffusion flame increases obviously with the increase of pressure.The NO formation shows the same trend.The NO produced through thermal route dominates the variation trend.Besides,NO formation increases with the n(H_2)∶n(CO)ratio in syngas coflow flame.