摘要
利用携带流脱硝试验装置，研究了反应温度（Tr）、烟气组分（O2、CO、水蒸气）、飞灰以及碱金属添加剂等对选择性非催化还原（selective non-catalytic reduction，SNCR）脱硝效果的影响，探讨了NO还原机理。结果表明：随着反应温度的升高，SNCR脱硝效率呈现先增加后降低的趋势。随着烟气中氧含量的增加，SNCR脱硝效率呈现先快速增加后逐渐降低的趋势，当氧含量为2%时，脱硝效率取得最大值84.6%。烟气中CO存在对SNCR脱硝具有一定的抑制作用。随着烟气中水蒸气含量（0～15%）的增加，脱硝效率呈现先增加后减少并逐渐趋于稳定的趋势，4%水蒸气条件下 SNCR脱硝效率达到最大值，约为73.5%。碱金属（钠、钾）添加剂对SNCR脱硝具有显著的促进作用，燃煤飞灰对SNCR脱硝效率则具有一定的抑制作用，添加125μmol/mol Na2CO3的SNCR脱硝效率可达84.9%，在水蒸气、CO、Na2CO3和飞灰的耦合作用下，仍可获得72.1%的脱硝效率。
The effects of reaction temperature, flue gas components （O2, CO, water vapor）, fly ash and alkali metal additives on NO reduction during the selective non-catalytic reduction （SNCR） process were investigated in an entrained flow reactor, and NO reduction mechanism was also analyzed. The results indicate that： NO removal efficiency of SNCR shows a trend of increase first and decrease later with increasing reaction temperature. NO removal efficiency shows a pattern of rapid increase first and decrease later with increasing oxygen content, and the best NO removal efficiency of 84.6%is obtained when 2%oxygen was used. The additive of carbon monoxide has a certain adverse effect on NO reduction in the SNCR process. NO removal efficiency shows a tendency of increase first, decrease later and being stable gradually with increasing water vapor （0～15%） in the flue gas, and the best NO removal efficiency of 73.5%is obtained at 4%water vapor. Alkali metal （K, Na） additives have significant promoting effects on NO reduction, but the fly ash has a certain adverse effect on NO reduction in the SNCR process. NO removal efficiency through SNCR can reach 84.9% while adding 125μmol/mol Na2CO3 in the flue gas. NO removal efficiency of SNCR still reaches 72.1% through the coupling effect of water vapor, CO, Na2CO3 and fly ash.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第12期3054-3060,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(51476079
51076067)
江苏省自然科学基金项目(BK2010081)~~
关键词
选择性非催化还原
脱硝
烟气组分
飞灰
添加剂
selective non-catalytic reduction （SNCR）
NOreduction
flue gas components
fly ash
additives
