摘要
在一石英管反应器内研究了不同氧量下钠盐对尿素选择性非催化还原NO的影响,温度范围为800～1150℃。研究表明:单独采用尿素溶液,脱硝率随着氨氮当量比(normalized stoichliometric ratio,NSR)的增大而增大,但氮剂利用率下降。氧量的增加令反应温度窗口向低温方向移动,最大脱硝率也相应略微减小。微量的钠盐添加剂对尿素溶液的脱硝反应有显著的促进作用,提高了最佳脱硝效率,并且有效拓宽了温度窗口。其促进效果随着氧量的增加而明显提高。在保证加入的钠原子浓度一致的条件下,各种钠盐添加剂对选择性非催化还原技术(selective non-catalytic reduction,SNCR)脱硝过程的促进效果较为接近。低温范围内CH3COONa效果较好,NaOH和Na2CO3总体上效果最佳。
The effect of sodium salts on selective non-catalytic reduction of urea has been investigated experimentally with a tube reactor at 800-1 150℃ and at differrent oxygen concentration in the simulated gas. The experimental results indicate that the effect of increasing normalized stoichiometric ratio （NSR） is to enhance the NO removal efficiency but to decrease the utilization efficiency of urea. Higher O2 concentration shifts the NO reduction profile towards lower temperatures and slightly lessens the maximum NO removal efficiency. Small amounts of sodium additives perform the obvious promotion effect on NO removal efficiency and widen the temperature window. And its effect becomes greater as the O2 concentration increases. The promotion effect of any kind of sodium salts is similar in our experiments when the sodium concentration in gas is same. CH3COONa is more effective at lower temperature while NaOH and Na2CO3 have a better promoting effect at the whole temperature range.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第35期33-38,共6页
Proceedings of the CSEE
关键词
尿素
钠盐
选择性非催化还原
NO
urea
sodium salts
selective non-catalyticreduction
NO
