530MW超临界机组对冲燃烧锅炉低氮燃烧贴壁风系统数值计算  

Numerical Analysis on Low NO_x Combustion Near-wall Air Distribution System of an Opposed Firing Boiler for 530 MW Supercritical Units

作　　者：杜智华[1] 蒙毅[1] 孙军[1] 

机构地区：[1]西安热工研究院有限公司,西安710032

出　　处：《动力工程学报》2017年第6期425-431,共7页Journal of Chinese Society of Power Engineering

摘　　要：为了有效预防水冷壁高温腐蚀、控制NO_x排放量,进行了某墙式对冲燃烧锅炉燃烧器低氮配风优化设计与改造,在主燃烧区加装"非对称矩形高速直流贴壁风"系统.结果表明:实测水冷壁贴壁气氛大幅改善,贴壁O_2体积分数明显升高,由0.3%升高至3.0%;炉膛前后墙贴壁烟温呈下降趋势,降幅100K左右,有效降低了水冷壁高温爆管风险.To reduce NOx emission of an opposed firing boiler and to prevent high-temperature corrosion of the water wall, a low-NOx combustion retrofit was carried out by adding an air distribution system in the main combustion zone to supply a non-symmetrical rectangular high-speed direct-flow air curtain over the wall. Results show that after retrofit, the measured near-wall atmosphere has been improved significantly with a remarkable increase in volume fraction of near-wall oxygen from 0.30% to 3.0%, while the nearwall gas temperature around front and back wall has been reduced by about 100 K, lowering the risk of high-temperature tube burst of the water wall.

关 键 词：对冲燃烧锅炉 低氮燃烧 贴壁风 高温腐蚀 数值计算 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]