240 t/h CFB运行负荷NO_(x)生成规律的数值模拟  

Numerical Simulation of NO_(x) Generation Law for 240t/h CFB Operating Load

作　　者：冷雪 胡彦伟[2] LENG Xue;HU Yan-wei(Shaanxi Institute of Special Equipment Inspection and Testing;Harbin Institute of Technology)

机构地区：[1]陕西省特种设备检验检测研究院 [2]哈尔滨工业大学能源与动力工程学院

出　　处：《电站系统工程》2024年第3期45-48,51,共5页Power System Engineering

基　　金：国家重点研发计划项目(2018YFF0216000)资助。

摘　　要：为了控制循环流化床锅炉燃烧过程中NO_(x)的生成,针对240 t/h循环流化床锅炉,建立了包含NO_(x)和SO_(2)的数值模型,使用CFD研究了流化床内的颗粒运动、组分分布以及化学反应速率对NO_(x)生成的影响,获得了不同负荷条件下炉膛出口处的NO_(x)浓度。结果表明:额定负荷条件下,NO_(x)的浓度最高,分别是70%负荷的1.22倍,是50%负荷的1.87倍,考虑到燃烧效率,建议锅炉运行应在70%~80%额定负荷。To control the formation of NO_(x) in the combustion process of the circulating fluidized bed boiler,a numerical model including NO_(x) and SO_(2) is established for the 240t/h circulating fluidized bed boiler,and the particle movement in the fluidized bed is studied by means of numerical simulation,composition distribution and the effect of chemical reaction rate on NO_(x) generation,the NO_(x) concentration at the furnace outlet under different load conditions was obtained.The results show that under the rated load condition,the NO_(x) concentration is the highest,which is 1.22 times of the 70% load and 1.87 times of the 50% load respectively.Considering the combustion efficiency,it is recommended that the boiler should operate at 70%-80% of the rated load.

关 键 词：氮氧化物生成 循环流化床 不同负荷 组分分布 

分 类 号：TK39[动力工程及工程热物理—热能工程]