过量空气系数对四角切圆燃烧锅炉特性影响的数值模拟  

Numerical Simulation for Impact of Excess Air Ratio on Tangential Combustion

作　　者：蔡桃[1] 段耀辉[2] 乔晓磊[1] 金燕[1] 

机构地区：[1]太原理工大学电气与动力工程学院 [2]山西电力职业技术学院

出　　处：《电站系统工程》2013年第2期17-19,23,共4页Power System Engineering

摘　　要：运用FLUENT软件模拟研究600 MW四角切圆煤粉锅炉在过量空气系数分别为1.1、1.2和1.3等3种工况的燃烧特性。研究结果表明,随着过量空气系数增加,主燃烧区的气流速度明显加快,温度逐渐升高,O2浓度升高,CO浓度明显降低。另外,分析了不同过量空气系数对炉膛出口平均速度、烟温以及对NOx生成的影响规律,为锅炉的设计、运行和改造提供了一定依据。FLUENT software has been employed to investigate combustion characteristics in the tangentially fired furnace of a 600 MW pulverized coal boiler at different excess air ratios of 1.1, 1.2 and 1.3. The results show that with the increasing of excess air ratio, air velocity and temperature in primary combustion zone increased; and CO concentration decreased due to the increasing of 02 concentration. Furthermore, the numerical simulation for impact of excess air ratio on average velocity, gas temperature and NOx formation at the furnace outlet is conducive to the boiler design, operation and transformation.

关 键 词：四角切圆锅炉 过量空气系数 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]