摘要
采用煤粉燃烧自维持一维试验炉研究了低挥发分贫煤空气分级燃烧和NO_(x)排放特性,重点研究了空气分级深度、分级燃尽风喷口位置对贫煤燃烧NO_(x)排放的影响,探索能够实现低NO_(x)排放的空气分级燃烧布置方式。结果表明:随着主燃区过量空气系数αM减小,炉膛出口NO_(x)质量浓度逐渐降低,当αM为0.70时NO_(x)还原效率可以达到33.1%;随着分级燃尽风位置比Ms增加,煤粉颗粒在还原区内停留时间延长,炉膛出口NO_(x)质量浓度进一步降低,并存在一个最佳分级燃尽风位置比;当αM为0.85时,最佳分级燃尽风位置比Ms为0.47,对应的炉内NO_(x)还原效率为37.7%。
A self-sustained one-dimensional experimental furnace for pulverized coal combustion was used to study the characteristics of air-staged combustion and NO_(x) emission of low-volatile lean coal.The investigation focuses on the influence of air-staged depth and over-fire air(OFA)nozzle position on the NO_(x) emission,so as to explore the optimal air-staged combustion arrangement to realize low NO_(x) emission of lean coal.The results show that,the NO_(x) mass concentration at the furnace outlet gradually decreased with the excess air coefficientαM in the primary combustion zone,and the NO_(x) reduction efficiency reached 33.1%whenαM=0.70.With the increase of OFA nozzle position ratio Ms,the residence time of coal particles in the reduction zone prolonged,the NO_(x) mass emission further decreased,and there existed an optimal OFA nozzle position ratio.WhenαM=0.85,the optimal OFA nozzle position ratio was 0.47,and the corresponding NO_(x) reduction efficiency in the furnace was 37.7%.
作者
王勇强
周月桂
韩佳宸
WANG Yongqiang;ZHOU Yuegui;HAN Jiachen(Institute of Thermal Energy Engineering,School of Mechanical and Power Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《热力发电》
CAS
CSCD
北大核心
2021年第11期61-67,共7页
Thermal Power Generation
基金
国家重点研发计划项目(2018YFB0605901)
国家自然科学基金项目(51976120)
华能国际电力股份有限公司科技资助项目(HNKJ17-G07)。
