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化工学报  2014 

煤焦直接还原脱除烟道气氮氧化物

DOI: 10.3969/j.issn.0438-1157.2014.06.040, PP. 2249-2255

Keywords: 煤焦,氮氧化物,还原,选择性

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Abstract:

选用3种不同煤焦,采用程序升温和恒温实验方法,在固定床上考察了不同实验条件下的NO转化率和C对NO选择性,分析了煤焦脱硝的机理和影响因素。实验结果表明:NO和O2在煤焦表面发生化学吸附所形成的络合物在脱硝过程中起着关键作用,影响C-NO反应和C-O2反应的竞争与协作关系。在所考察的煤焦中锡林浩特褐煤焦脱硝效果最好,当温度为723K时烟道气中NO还原率可达99%;在温度623~923K、O2浓度0~5%范围内,提高温度和O2浓度均有利于提高NO转化率,而降低O2浓度有利于提高C对NO选择性;烟道气中NO浓度越高,其转化率越低,但C对NO选择性越高。

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