本文研究碱金属元素Na和K对NH3选择性非催化还原NO的影响,并组建Na-K-H-O-N详细化学反应机理解释其影响机制.实验表明,碱金属盐将“温度窗口”向低温方向扩展,并在较大温度范围内增加脱氮效率,效果与碱金属盐的种类和碱金属原子浓度几乎无关,但钠盐的作用强于钾盐;高温下碱金属对脱氮的促进作用较小,高浓度碱金属的脱氮效率比低浓度时略高.路径分析显示,NH2对还原NO起重要作用,OH是促使NH2生成的关键,Na的加入有利于在低温下促进OH自由基的生成,其主要反应为NaOH+O2 →NaO2 +OH、NaOH+M→Na+OH+M和NaO+H2O→NaOH+OH.相同形式的含K反应由于较高的活化能和较低的温度指数,反应速率较低,对OH生成的促进作用有限.
参考文献
| [1] | Shengli Niu .An experimental study on the effect of operating parameters and sodium additive on the NO_xOUT Process[J].Transactions of The Institution of Chemical Engineers. Process Safety and Environmental Protection, Part B,2011(2):121-126. |
| [2] | Zamansky Vladimir M.;Maly Peter M.;Ho Loc;Rusli Darwin;Gardiner William C. Jr.;Lissianski Vitali V. .Reactions of sodium species in the promoted SNCR process[J].Combustion and Flame,1999(4):821-831. |
| [3] | 李维成,李振山,蔡宁生.选择性非催化还原化学机制简化与沉降炉内反应流动的数值模拟[J].中国电机工程学报,2010(14):68-76. |
| [4] | 吴少华,曹庆喜,刘辉,安强,黄霞.气体添加剂对热脱硝过程影响的实验和建模研究[J].中国化学工程学报（英文版）,2010(01):143-148. |
| [5] | Seungmoon Lee;Kwinam Park;Jin-won Park;Byung-Hwan Kim .Characteristics of reducing NO using urea and alkaline additives[J].Combustion and Flame,2005(3):200-203. |
| [6] | Edgardo Coda Zabetta;Mikko Hupa .A detailed kinetic mechanism including methanol and nitrogen pollutants relevant to the gas-phase combustion and pyrolysis of biomass-derived fuels[J].Combustion and Flame,2008(1/2):14-27. |
| [7] | Lusi Hindiyarti;Flemming Frandsen;Hans Livbjerg;Peter Glarborg;Paul Marshall .An exploratory study of alkali sulfate aerosol formation during biomass combustion[J].Fuel,2008(8/9):1591-1600. |
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