210MW煤粉炉燃烧系统改进的数值模拟  

Numerical simulation on optimized combustion system of a 210 MW pulverized coal boiler

作　　者：唐昭帆 卢玫[1] 王克[2] 王琳琳[1] 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海发电设备成套设计研究院,上海200240

出　　处：《能源工程》2016年第6期58-64,共7页Energy Engineering

基　　金：国家自然科学基金资助项目(51176126)

摘　　要：运用CFD软件对某210 MW煤粉锅炉的燃烧过程进行三维数值模拟,针对锅炉实际存在温度分布不好、燃烧效率不高、结渣问题严重,对炉膛进行偏二次风、反切燃尽风及两者联用改进。结果表明:与设计工况相比,单独的小角度偏二次风改进下的炉膛燃烧区温度降低约300 K,水冷壁附近氧气浓度提高,减少了水冷壁的结渣和高温腐蚀;单独小风率反切燃尽风改造后的配风方式更合理,烟气的停留时间增加0.6 s,燃烧区温度提高约373 K,高温区域扩大,炉膛出口烟气热偏差系数减小约0.7%,提高了锅炉的燃烧效率和运行的安全性,但可能加重炉内结渣;二者联用改进既能够很好地改善炉膛的温度分布,扩大炉膛高温区域,提高燃烧区温度约353 K,同时能够减少燃烧器区域的结渣和高温腐蚀,减小炉膛出口烟气热偏差,采用二者联用改造对锅炉运行最为合适。By using the CFD software, numerical simulation was taken an a210 M W pulverized coal fired belier. As the boiler temperature distribution was not homogeneons, and combustion efficiency was not high, serions slagging at the teal working condition, optimized methods were carried out respectively at deflected secondary air, opposite direction OFA and combined deflected secondary air throe molds. Results showed that compared with original working condition, independent deflected secondary air mold could make the temperature decreased almost 300 K at the combustion area, oxygen concentration decreased near water cooled wall, and slagging and high temperature corrosion problem were improved. Independent opposite direction OFA mold could obtion a better air distribution, the gas stay time increased 0.6 s, temperature increased 373 K, the thermal deviation coefficient decreased 0.7%, and combustion efficiency in-creased higher, but slagging problem maybe become more serious, Combined mold could not only get a better tempera- ture distribution, improve the slagging and high temperature cession problem, but also decrease the thermal deviation coeffieient of outlet gas, Taking the combined mold was ihe most reasonable optimized way for the boiler

关 键 词：煤粉燃烧 数值模拟 偏二次风 反切燃尽风 改进 

分 类 号：TK223.2[动力工程及工程热物理—动力机械及工程]