采用GRI-SNCR高温反应机理研究无氧条件下NH3与NO反应的临界温度及脱硝反应机理，在小试实验台进行实验对模型进行验证，并根据各基元反应对NH3与NO的产率贡献，归纳主要的基元反应及过渡产物的转化路径。结果表明：GRI-SNCR反应机理能较好地模拟无氧工况下地NH3/NO反应；临界温度为1 130 ℃，当温度高于1 130 ℃时，CO2和NO高温下产生的O自由基是脱硝链式反应的开端，温度达到1 200 ℃时，脱硝效率几乎达到100%；而温度的继续升高，中间产物HNO的热解导致NO的含量有所升高，且温度越高，热解反应速度越高，脱硝效率越低。

GRISNCR chemistry mechanism is adopted to obtain the critical temperature and investigate the reaction mechanism for NH3/NO reactions in the absence of oxygen.Experiment is conducted in the benchscale testing facility and experimental data obtained is utilized to validate the kinetic model.Furthermore,rate of production analysis is adopted to identify elementary reactions that contribute largely to generation or consumption of NO.Therefore,reaction paths can be concluded.Results show that the prediction of GRISNCR chemistry mechanism agrees well with experimental data,and the critical temperature for NH3/NO reactions is 1 130 ℃.When temperature exceeds 1 130 ℃,NO reduction by NH3 is initiated by pyrolysis of CO2 and NO.The efficiency of NO reduction increases as temperature rises and reaches almost 100% at 1 200 ℃.However,with even higher temperature,the denitrification efficiency decreases with the increase of temperature due to thermal decomposition of intermediate nitrogen species HNO that shows a clearly positive correlation with temperature.

TK16

国家重点研发计划（2018YFB0604202）