摘要
利用Chemkin软件研究了H_(2)O的化学效应对不同含氢量的合成气(H_(2)/CO体积比=10∶90和50∶50)火焰温度、热释放特性及NO生成路径的影响规律。结果表明,尽管H_(2)O相比N_(2)具有更高的比热容,但是其能够直接参加化学反应,促进了OH和HO_(2)自由基的生成,提升了H+O_(2)+H_(2)O=HO_(2)+H_(2)O、H+HO_(2)=2OH、OH+CO=H+CO_(2)、OH+H_(2)=H+H_(2)O等反应的热释放速率,导致H_(2)O的化学效应能够提升合成气火焰温度,且对低氢含量的合成气火焰温度提升作用更加明显。不论H_(2)/CO比例高低,H_(2)O的化学效应均促进了热力型NO生成,抑制了NNH路径对NO生成的贡献;在高氢含量的合成气(H_(2)/CO=50∶50)火焰中H_(2)O的化学效应促进了N_(2)O路径对NO生成,但是抑制了低氢含量的合成气(H_(2)/CO=10∶90)火焰中N_(2)O向NO的转化。
Using the Chemkin software,the chemical effects of H_(2)O on the premixed flame temperature,heat release characteristics,and NO production pathways for syngas with different hydrogen contents(i.e.,H_(2)/CO volume ratio=10∶90 and 50∶50)are investigated.The results show that although H_(2)O has a larger specific heat compared to N_(2),it can directly participate in the chemical reactions,promote the generation of OH and HO_(2)radicals,and enhance the heat release rate of the reactions,such as H+O_(2)+H_(2)O=HO_(2)+H_(2)O,H+HO_(2)=2OH,OH+CO=H+CO_(2),and OH+H_(2)=H+H_(2)O,which results in the chemical effect of H_(2)O being able to enhance the syngas flame temperature,and the enhancement effect on the flame temperature is more pronounced for the low-hydrogen syngas.Regardless of the H_(2)/CO ratio,the chemical effect of H_(2)O promotes the thermal-NO production and suppresses the contribution of the NNH pathway to NO production;the chemical effect of H_(2)O promotes the N_(2)O pathway to NO production in the syngas flame with high hydrogen contents(H_(2)/CO=50∶50)but suppresses the conversion of N_(2)O to NO in the syngas flame with low hydrogen contents(H_(2)/CO=10∶90).
作者
刘宇谦
苏凯
孔俊峰
刘鹏飞
贺世鹏
徐顺塔
刘豪
LIU Yu-qian;SU Ka;KONG Jun-feng;LIU Peng-fei;HE Shi-peng;XU Shun-ta;LIU Hao(National Energy Group Taizhou Power Generation Co.,Ltd.,Taizhou 225300,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China;Yantai Longyuan Power Technology Co.,Ltd.,Yantai 264006,China)
出处
《节能技术》
CAS
2024年第3期219-226,共8页
Energy Conservation Technology
基金
国家自然科学基金面上项目(51876074)。
