300MW贫煤锅炉低氮燃烧改造数值模拟  

300MW Lean Coal-fired Boiler of Low Nitrogen Combustion Numerical Simulation

作　　者：李永华[1] 王士桥 郑平安 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003 [2]西安普华燃烧工程有限公司,陕西西安710043

出　　处：《锅炉技术》2015年第3期5-11,共7页Boiler Technology

摘　　要：对某电厂300 MW贫煤锅炉低氮燃烧改造前后不同负荷进行数值模拟,研究分析改造前后锅炉炉内流场、温度场和组分浓度分布的变化,找到氮氧化物排放规律。计算结果表明:炉膛流动燃烧符合四角切圆锅炉实际运行情况。低NOx燃烧改造后,在炉膛出口过量空气系数一定条件下,各负荷运行NOx排放浓度下降均在40%以上,锅炉效率也有不同程度的提高,同时未带来明显的负面效应,改造对同类锅炉改造具有指导意义。Using simulating software caculated a lean coal-fired 300 MW unit in different loads before and after modification. Researching the differences of the flow field, the temperature field and the composition field, find the NOx emission rule between transformation. The results show that the flow field and the temperature field meet well with the actual operation. With furnace export excess air coefficient under certain conditions, every load operation the NOx emission decreases more than 40% and the boiler efficiency increases in varying degrees, without obvious negative effect after modification. The modification has reference fluence of the similar boiler.

关 键 词：四角切圆锅炉 NOX排放 SOFA 数值模拟 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]