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烟气组分和添加剂对选择性非催化还原脱硝特性的影响

DOI: 10.13334/j.0258-8013.pcsee.2015.12.016, PP. 3054-3060

Keywords: 选择性非催化还原,脱硝,烟气组分,飞灰,添加剂

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Abstract:

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(selectivenon-catalyticreduction,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/molNa2CO3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。

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