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切圆锅炉空气分级NOx生成特性空间分布研究

DOI: 10.13334/j.0258-8013.pcsee.2014.14.003, PP. 2235-2243

Keywords: 切圆锅炉,空气分级,生成特性,燃料型NO,热力型NO,分离燃尽风

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Abstract:

针对某电厂NOx排放过高的问题,通过对NOx的形成机制以及煤质分析,运用CFD软件模拟锅炉炉内燃烧状况,采用空间分布法分析600MW锅炉深度空气分级燃烧下NOx的生成特性。计算结果表明,空间分布法能够详细的说明NOx生成特性;燃烧器喷口附近区域NOx的生成与还原最为剧烈;挥发分析出速率与焦炭燃尽速率对HCN生成有着重要的影响;HCN与一、二风的混合程度影响了主燃区燃烧器喷口下游燃料型NOx反应速率;燃料型NOx生成速率明显大于热力型NOx生成速率,控制NOx的产生最主要是控制燃料型NOx的生成与还原。分离燃尽风(separatedoverfiredair,SOFA)投入使得主燃烧器区域缺氧程度严重,主燃区NOx整体浓度较低,后期未完全燃烧物质的补燃影响了出口截面NOx浓度;采用SOFA分级能够在保障NOx得到还原的前提下,进一步促进焦炭的燃尽,降低出口烟温和飞灰含碳量。

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