内部烟气再循环式小型天然气炉内NO_x排放的研究  

STUDIES ON NO_x EMISSION IN A NATURAL GAS PILOT BOILER WITH INTERNAL FLUE GAS RECIRCULATION

作　　者：肖震[1] 郭印诚[1] 

机构地区：[1]清华大学航天航空学院,北京100084

出　　处：《工程热物理学报》2008年第10期1780-1782,共3页Journal of Engineering Thermophysics

基　　金：北京市科技计划资助项目(No.GYYZ000420050711);北京市教委共建计划资助项目(No.JD100030509)

摘　　要：本文采用实验和数值模拟方法对内部烟气再循环式小型天然气炉内氮氧化物的排放进行了研究.探讨了炉膛中加装的一种中心圆筒结构对炉内烟气再循环流动及NO_x排放的影响.研究结果表明,中心圆筒的存在可以使氮氧化物的排放有所降低.与不加装中心圆筒的工况相比,加装中心圆筒后炉内NO_x的排放随过量空气系数的变化较弱.炉内加装中心圆筒后,烟道入口处的温度降低,这表明中心圆筒的存在强化了炉壁的散热,从而降低了排烟温度。Experimental and numerical simulation methods were adopted to study natural gas combustion in a pilot boiler. The effect of internal flue gas recirculation on NOx emission was investigated. Experimental and numerical simulation results give temperature, oxygen concentration, NO concentration at the entrance of the chimney of the pilot boiler. Experiment results show that the central pipe is beneficial to reduce NO emission. With the central pipe in the pilot boiler, the measured temperature at the entrance of the chimney is lower than that without the central pipe, which means more heat loss in the pilot boiler, and this indicates that the heat transfer is enhanced by the central pipe.

关 键 词：天然气燃烧 小型锅炉 内部烟气再循环 氮氧化物 

分 类 号：X932[环境科学与工程—安全科学]