摘要
低负荷下NOx生成浓度较高是燃用高挥发分煤种切圆燃烧锅炉普遍存在的问题,理论分析与试验研究表明:在中、低负荷区间,燃烧初期空气/燃料比的增加是NOx生成浓度升高的重要原因;在理论分析与试验研究的基础上,对周界风控制方式进行了创新性改进,通过控制不同负荷下周界风的挡板开度,在锅炉效率不变、汽温参数不受影响的前提下,显著降低了中、低负荷区间的NOx生成浓度。
The problem of high concentration NOx produced at low loads is quite general in tangentially-firing boilers using high volatile coal. The theoretical analysis and field tests indicate that under medium and low loading conditions, as the air to fuel ratio richens in the initial firing stage the NO~ concentration increase substantially. Therefore, a new fuel air damper control scheme is proposed, in which the damper opening is adjusted at different loads. Consequently, NOx production is significantly reduced at low loads with the boiler efficiency and steam temperatures hardly affected.
出处
《中国电力》
CSCD
北大核心
2014年第12期13-16,共4页
Electric Power
关键词
火力发电厂
锅炉
切圆燃烧
低负荷
高挥发分煤
coal-fired power plant
utility boiler
tangentially-firing
low load
NOx
high volatile coals