商用SCR催化剂氧化SO_2性能实验研究
摘要
在固定床实验台上,分析研究了温度及不同烟气成分对商用SCR催化剂SO_2氧化性能的影响。实验结果表明:温度对SCR催化剂SO_2氧化能力的影响明显,当温度由250℃增加至450℃时,SO_2/SO_3转换率由0.21%增加至1.92%;在低SO_2浓度范围内,随着SO_2浓度的增加,SO_2/SO_3转换率快速增加,而在高SO_2浓度范围内,SO_2对SO_2/SO_3转换率具有抑制作用;NO对SO_2/SO_3转换率无影响;即使烟气中没有O_2,SO_2也会被催化剂V_2O_5氧化,且0%-3%的O_2浓度对SO_2/SO_3转换率具有明显的促进作用,O_2浓度高于3%时对其影响较小;SO_2与NH_3具有相互抑制的竞争吸附关系。
引文
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[5]唐昊,李慧,杨江毅,等.NH3-SCR工艺中硫酸铵盐的生成与分解机理研究进展[J].化工进展,2018,37(3):822-831.
[6]BENSON S A,LAUMB J D,CROCKER C R,et al.SCR catalyst performance in flue gases derived from subbituminous and lignite coals[J].Fuel Processing Technology,2005,86(5):577-613.
[7]马双忱,金鑫,孙云雪,等.SCR烟气脱硝过程硫酸氢铵的生成机理与控制[J].热力发电,2010,39(8):12-17.
[8]PaRVULESCU V I,GRANGE P,DELMON B.Catalytic removal of NO[J].Catalysis Today,1998,46(4):233-316.
[9]韩高岩,吕洪坤,李剑,等.空气分级燃烧对炉膛中SO3生成的研究[J].电站系统工程,2017,(2):13-16.
[10]DUNN J P,KOPPULA P R,STENGER H G,et al.Oxidation of sulfur dioxide to sulfur trioxide over supported vanadia catalysts[J].Applied Catalysis B:Environmental,1998,19(2):103-117.
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[15]唐昊,李文艳,王琦,等.商用选择性催化还原催化SO2氧化率控制研究进展[J].化工进展,2017,36(6):2143-2149.
[16]朱崇兵,金保升,李锋,等.SO2氧化对SCR法烟气脱硝的影响[J].锅炉技术,2008,39(3):68-72.
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