多点喷射气体再燃的氮氧化物排放特性  

NO_x Emission Characteristics of Gas Reburning with Multi-Point Injection

作　　者：陈宝明[1] 张忠孝[1] 毕德贵[1] 李明强[1] 田莉勤 

机构地区：[1]上海理工大学能源与动力学院,200093

出　　处：《燃烧科学与技术》2015年第3期254-259,共6页Journal of Combustion Science and Technology

摘　　要：为检验某220,t/h煤粉炉采用多点喷射气体再燃改造技术的效果进行实验,研究停留时间、炉膛氧量、再燃比例等因素对NOx排放特性的影响,并结合化学动力学计算分析天然气再燃机理,与已有成果进行对比分析.结果表明,最佳停留时间为0.67,s,过长的停留时间对NOx还原效果影响不大;NOx排放浓度都随着氧量的增加而增大,随着锅炉负荷降低而减小,炉膛出口最佳氧量为5%,;随着再燃量的增加NOx浓度下降,最佳再燃比例为15%,,再燃喷口采用多点喷射的脱硝效率比四点喷射时提高11%,.Focusing on a 220,t/h PC boiler that was renovated with gas reburning technology,the main target of this paper was to observe the influence of several operation factors,such as residence time,oxygen and reburning fuel ratio on NOx reduction. The research results were compared with the existing conclusions according to the chemical kinetic calculation of gas reburning. The results indicated that：the best residence time was 0.67,s,and too long a residence time had little effect on NOx reduction;NOx emission concentration increased with the increase of oxygen content and decreased with the decreasing of boiler load,and the optimal oxygen content was 5%;NOx concentration decreased with the increase of reburning fuel,and the best reburning amount was 15%;the denitration efficiency using multi-point injection reburning nozzle was increased by 11% compared with that using four-point injection.

关 键 词：多点喷射 再燃 影响因素 NOx浓度 

分 类 号：TK16[动力工程及工程热物理—热能工程]