摘要
针对某电厂300 MW四角切圆锅炉高温腐蚀严重、NOx排放浓度较高等问题,运用Fluent软件对机组炉膛燃烧进行了数值模拟,对比了燃烧器改造前后炉内的流场、组分场以及NOx浓度场的计算数值,并将计算结果与试验值进行了比较,且两者吻合较好,验证了模拟结果的可靠性。计算结果表明:采用低氮改造措施并对空气进行深度分级后,主燃区氧量降低,锅炉整体温度水平分布有所下降,改造后火焰切圆形成良好,炉内高温腐蚀得到改善,且NOx排放量较改造前减少了20%,改造方案对同类型锅炉机组运行和优化有一定的指导意义。
In order to solve the problems of serious high temperature corrosion and high NOxemission concentration in a 300 MW tangentially-fired boiler in a power plant,software Fluent was used to simulate the furnace combustion of the unit,and the calculated data of the flow field,the component field and the NOxconcentration field in the furnace are compared before and after the burner reform.The calculated values are compared with the experimental ones and the results are in good agreement with each other. The reliability of the simulation results is verified. The results show that after adopting the low-nitrogen reform measures and deep classification of the air,the oxygen content in the main combustion zone is reduced,and the overall temperature level distribution of the boiler is reduced,too. After the transformation,the flame tangent forms well,and the high-temperature corrosion in the furnace has been improved. The NOxemission has been reduced by 20%. The transformation scheme has a certain guiding significance for the operation and optimization of the same type boiler unit.
作者
高建强
敬赛
庄绪增
GAO Jianqiang;JING Sai;ZHUANG Xuzeng(School of Energy Power and Mechanical Engineering,North China ElectricPower University,Baoding 071003,China)
出处
《电力科学与工程》
2018年第8期66-72,共7页
Electric Power Science and Engineering
关键词
燃煤锅炉
四角切圆
数值模拟
分级燃烧
优化改造
coal fired boiler
four corner tangential circle
numerical simulation
staged combustion
optimization transformation
