摘要
采用GRI-SNCR高温反应机理研究无氧条件下NH3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NH3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NH3/NO反应;临界温度为1130℃,当温度高于1130℃时,CO2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1200℃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 NH3/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 NH3/NO reactions is 1130℃.When temperature exceeds 1130℃,NO reduction by NH3 is initiated by pyrolysis of CO2 and NO.The efficiency of NO reduction increases as temperature rises and reaches almost 100%at 1200℃.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.
作者
朱志祥
张忠孝
于娟
孙蔚婷
ZHU Zhi-xiang;ZHANG Zhong-xiao;YU Juan;SUN Wei-ting(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai,China,200240)
出处
《热能动力工程》
CAS
CSCD
北大核心
2020年第2期133-139,167,共8页
Journal of Engineering for Thermal Energy and Power
基金
国家重点研发计划(2018YFB0604202)。
