1000 MW燃煤锅炉低氮燃烧的数值模拟与分析  

Numerical Simulation and Analysis of Low-NOx Combustion of 1 000 MW Coal-fired Boiler

作　　者：王东风[1] 李应保[1] WANG Dongfeng;LI Yingbao(School of Control and Computer Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学控制与计算机工程学院,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2018年第2期96-102,共7页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(61203041);中央高校基本科研业务费专项资金资助项目(2014MS139)

摘　　要：为了研究某1 000 MW燃煤锅炉低氮改造后的最佳配风方案,应用流体力学仿真软件对炉内温度、CO浓度等燃烧特性进行了数值模拟与分析。结果表明:对比4组不同二次风配风工况下炉内速度场、温度场以及组分场的分布信息,发现锅炉低氮燃烧适宜采用正宝塔式二次风配风方式;另外,通过分析不同燃尽风与附加风风率对锅炉燃烧效率与炉膛出口NO浓度的影响,发现燃尽风风率附加风风率均取15%左右时,炉膛出口NO浓度降低到200 mg/m^3以下,锅炉燃烧效率最优。数值模拟实验结果对锅炉低氮燃烧运行具有重要指导价值。In order to study the best air distribution scheme for a 1 000 MW coal-fired boiler after low-NOx retrofit,the authors used the applied fluid dynamics software to conduct a numerical simulation and analysis of the combustion characteristics such as temperature and the NO concentration inside the boiler.The results show that the boiler of low-NOx combustion is proper to utilize the pyramid secondary air distribution method after comparing the distribution of speed field,temperature field and composition field under four different secondary air distribution conditions;In addition,this paper analyzed the effects of different ratios of the over-fire air(OFA)and additional air(AA)upon the boiler combustion efficiency and NO concentration at furnace outlet.The results show that the NO concentration at the furnace outlet drops below 200 mg/m 3 and boiler combustion efficiency tends to be the highest when the OFA rate and AA rate are both about 15%,which is favorable to the low-NOx combustion operation of boiler.

关 键 词：燃煤锅炉 数值模拟 低氮改造 配风方式 一氧化氮浓度 燃烧效率 

分 类 号：TK224.2[动力工程及工程热物理—动力机械及工程]