基于CFD的影响甲烷燃烧炉NO_x排放因素的研究

Influencing factors of NO_x emissions in methane combustion furnace based on CFD

应用计算流体力学软件FLUENT,对以甲烷为燃料的燃烧炉内的燃烧过程进行模拟。建立数学模型,研究了不同空气预热温度、空气氧浓度、空气过剩系数、喷孔直径等情况下的温度分布以及NOx排放量的变化情况。在此基础上,进一步分析了燃烧炉操作参数和结构参数对燃烧性能的影响,为改善燃烧效果和降低污染物排放状况提供指导。结果表明:高温低氧燃烧、维持空气过剩系数范围为1.0～1.3、较小的喷孔直径有利于燃烧,可以使炉膛温度分布均匀,降低了NOx的排放量。

Simulate the combustion process in methane combustion furnace using the computational fluid dynamics software FLUENT. With the establishment of mathematical model, investigate the temperature and NOx emission under different preheated air temperature, oxygen concentration in the air, excess air coefficient and nozzle diameter. On that basis, further study the furnace operating and structural parameters on combustion performance, thus providing guidance for combustion improvement and pollutant emissions reduction. The results show that, high temperature and low oxygen combustion, keeping the excess air coefficient from 1.0 to 1.3 and smaller nozzle diameter all are conducive to combustion process and make the combustion furnace temperature distribute uniformly, therefore reduce NOx emissions.