复杂曲面花瓣燃烧器煤粉燃烧数值分析  

Numerical Analysis of the Petal Swirl Burner With Complex Geometry Configuration for Pulverized Coal

作　　者：赵伶玲[1] 周强泰[1] 

机构地区：[1]东南大学能源与环境学院洁净煤发电及燃烧技术教育部重点实验室,江苏省南京市210096

出　　处：《中国电机工程学报》2007年第5期39-44,共6页Proceedings of the CSEE

摘　　要：应用贴体坐标结构化网格对复杂曲面的花瓣燃烧器进行三维(360°)煤粉燃烧的数值模拟。给出花瓣燃烧器的流场、颗粒场、温度场和浓度场,分析花瓣燃烧器的稳燃及低NO_x燃烧原理和特性。计算结果表明,在花瓣稳燃器的作用下,煤粉气流进入炉内能立即在瓣后着火燃烧,并在径向回流区中形成稳定的“值班火焰”,为整个风粉气流的着火燃烧提供稳定的热量来源。花瓣燃烧器的火焰在炉内呈花瓣状,造成局部缺氧区,有利于降低NO_x的排放和低挥发分煤在广泛负荷范围内的稳定着火和完全燃烧。A three-dimensional （360°） body-fitted coordinate mathematical model to simulate the coal combustion of petal swirl burner（PSB） is firstly set up. Through the simulation, the fields of the gas flow, the coal particle, the gas temperature and the NOx pollutant concentration for PSB are given. The result shows that owing to the design of petal flame stabilizer（PFS）, part of the pulverized coal flow leaving the burner rapidly moves into the radial recirculation zones behind the PFS, and is immediately ignited and burnt which forms the flame always on duty behind each petal. The flame pattern of PSB gives a reliable ignition and steady firing condition for the low volatile coal and for the turndown capacities of the boiler meanwhile for lower NOx emission.

关 键 词：花瓣燃烧器 数值模拟 煤粉燃烧 值班火焰 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]