摘要
采用Chemkin4.1化学动力学软件,基于详细反应机制的柱塞流反应模型对生物质热解气及其成分气再燃还原NO反应过程进行机制分析和数值模拟研究。给出再燃燃料不同成分气CH4、CO、H2反应还原NO的特性和主要反应,得出CH4具有NO最佳还原效率,并给出最佳反应温度。由于秸秆更高的气相产率和热解气中更多的CH4含量,一定反应条件下,秸秆的热解气脱硝率比稻壳高。入口烟气中的氧气含量对脱硝率具有重要影响,氧量较高时对NO还原影响大的反应活化基团将大量被氧化而减少,使脱硝率降低。计算结果表明,热解气成分中对再燃还原NO起主要作用的是CH4,而CO和H2等成分影响较弱。通过敏感性分析得出:生物质热解气反应中,O和OH为诱导反应发生的主要自由基,CHi+NO和HCCO+NO为消耗NO的主要途径。
The reduction of NO by biomass pyrolysis gas and its contented species were analyzed and numerical simulated with the detailed chemical kinetic model by plug-flow reactor （PFR） model of Chemkin4.1 code. The characteristics of NO reduction and the main reaction routines were obtained for biomass pyrolysis gas and its contents such as CH4, CO, H2. From calculation, CH4 showed the highest NO reduction efficiency compared with other contented gases and its most appropriate reacting temperature range was also obtained. The other contented species （CO, H2） showed low reduction capacities. At suitable reacting conditions, biomass pyrolysis gas of corn straw demostrated higher NOx reduction efficiency than rice husk for higher volatile yields and higher CH4 content. High inlet oxygen concentration of flue gas greatly reduced NO reduction efficiency, because of high oxidization rates of chemical active species in flue gas. Simulation results also show that, compared with other contented species （CO, H2）, CH4 has the most important effects on reducing NO in biomass pyrolysis gas reburning process. With sensitivity analysis method, O and OH are the main free radicals inducing the reactions in the rehurning process of biomass pyrolysis gas. CHi＋NO and HCCO＋NO are the main routines of NO reduction.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第35期7-14,共8页
Proceedings of the CSEE
基金
国家重点基础研究专项经费项目(973项目)(2006CB200303)~~
关键词
再燃
NO消减
生物质热解气
化学反应机制
reburning, NO reduction
biomass pyrolysis gas
chemical reaction mechanism
