300MW煤粉锅炉燃烧器优化改造数值模拟分析  

Numerical simulation on burner optimization for a 300MW pulverized coal-fired boiler

作　　者：吕太[1] 闫晨帅[1] 刘维岐 

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《热力发电》2014年第7期56-60,65,共6页Thermal Power Generation

摘　　要：运用Fluent软件,对采用立体式分级低氮燃烧技术进行燃烧器改造的某300MW机组四角切圆燃烧锅炉改造前后额定工况下炉内的速度场、温度场、组分场以及NOx浓度场进行了数值计算,并与对应工况下的试验值进行对比,计算值与试验值吻合较好,验证了数值计算的准确性。计算及试验结果表明:采用立体式分级低氮燃烧技术有效控制了炉内结焦和高温腐蚀,NOx排放浓度较改造前降低40%左右,对同类型锅炉机组采用相似的燃烧器优化改造具有一定的参考价值。The Fluent software was applied to conduct numerical simulation on a 300 MW tangentially pulverized coal-fired boiler,for which the burners were modified by adopting stereo-staged process of low NOx combustion technique.The velocity field,temperature field,component field and NOx concentration field in furnace were simulated under rated condition before and after the modification.The calculated values were compared with the experimental data,and they agreed well with each other,verifying the accuracy of numerical calculation.The results show that：slagging and high-temperature corrosion in furnace could be effectively controlled by adopting the stereo-staged process of low NOx combustion technique,and NOx emission concentration reduced by about 40% compared after the modification.

关 键 词：煤粉锅炉 四角切圆 分级燃烧 优化改造 NOx 数值模拟 

分 类 号：TK224.11[动力工程及工程热物理—动力机械及工程]