摘要
针对热电联产机组75 t/h燃煤锅炉氮氧化物排放浓度较高的问题,对其燃烧系统进行了WR浓淡燃烧器和深度空气分级即多层轴向空气分级和径向空气分级组合的技术改造,将燃烧二次风分为70%~85%和15%~30%的两部分分别送入炉膛,使炉内煤粉燃烧分为热解区、富氧区和贫氧区,以减少NOx的排放。结果表明,改造后锅炉NOx排放浓度降低了40%以上,而飞灰含碳量和炉渣含碳量无明显变化。
Directing against the problem of high NOx emission from 75 t/h coal-fired boiler used for cogeneration,its combustion system has been retrofitted by using WR dense and dilute pulverized coal burners and deeply air-stagging technology,i.e.combination of multi-layer axial air-stagging and radial air-stagging,the secondary air for burning is divided into two parts,namely 70%~85% and 10%~30%,and being sent into furnace,making the combustion in furnace to be partitioned into heat-releasing zone,oxygen-enriched zone,and poor oxygen zone,so as to decreased the formation of NOx.Results show that the concentration of NOx emission decreases more than 40% after retrofitting,but the unburnt carbon in fly ash and slag hasn＇t obvious change.
出处
《热力发电》
CAS
北大核心
2011年第9期53-55,共3页
Thermal Power Generation
关键词
燃煤
锅炉
浓淡燃烧
空气分级
煤粉
燃烧器
fuel coal
boiler
dense and dilute combustion
air-stagging
pulverized coal
burner
