助燃空气O_(2)浓度对熔铝炉内温度分布及NO_(x)生成量影响

Influence of O_(2) concentration in combustion air on the temperature distribution and NO_(x) production in aluminum melting furnace

烟气再循环技术是降低熔铝炉能源消耗和NO_(x)排放的有效途径。为此,利用FLUENT软件对采用烟气再循环技术的某熔铝炉的燃烧过程进行数值模拟计算,分析了助燃空气中的O_(2)浓度对炉内温度分布的均匀性及NO_(x)生成特性的影响。结果表明,助燃空气O_(2)含量的降低有利于炉内气体的混合和稀释,有利于炉膛内温度的均匀分布,也有利于减少NO_(x)生成。研究结果表明助燃空气中的O_(2)含量过低会导致燃烧不稳定,O_(2)含量为15%时为最佳状态。烟气再循环技术是降低熔铝炉NO_(x)生成量的重要途径,是未来节能减排的重要手段。

Flue gas recirculation technology is an effective way to reduce energy consumption and NO_(x) emissions of aluminum melting furnace.For this reason,FLUENT software was used to simulate the combustion process of the flue gas recirculation system of a certain aluminum melting furnace,and the influence of oxygen concentration on the temperature distribution and NO_(x) generation characteristics in the furnace were analyzed.The calculation results show that the reduction of the oxygen content of the combustion air is beneficial to the mixing and dilution of the gas in the furnace,the uniform distribution of the temperature in the furnace,and the reduction of NO_(x) generation.Result indicates that too low oxygen content in combustion air will cause combustion instability,and 15%oxygen content is the best condition.Flue gas recirculation technology is an important way to reduce the amount of NO_(x) generated in aluminum melting furnaces,and an important means for energy saving and emission reduction in the future.