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针对某公司150t/h煤粉锅炉燃烧效率低、NOx排放浓度高、炉膛结焦等问题,提出了用富氧风作为炉顶燃尽风和贴壁风的分级燃烧新思路,采用计算机数值模拟技术和k-ε-■-g气相湍流燃烧模型及煤双挥发反应热解模型,对锅炉炉内速度场、温度场及燃烧过程中的NOx生成浓度进行数值模拟.技术改造后锅炉的燃烧效率保持在96%以上,锅炉综合热效率在91.40%以上,NOx排放量为625～763mg/m3,未发现炉膛水冷壁和高温过热器上有结渣现象.
Aiming at the problems of low combustion efficiency, high NOx emission, and coking of furnace in a 150t / h pulverized coal fired boiler of a certain company, a new idea of staged combustion using oxygen enriched air as top combustion air and adherent air was proposed. The numerical simulation technique And k-ε- ■ -g gas-phase turbulent combustion model and coal double-volatilization pyrolysis model were used to numerically simulate the velocity field, temperature field and the NOx concentration in the combustion process of the boiler. In more than 96%, the comprehensive thermal efficiency of the boiler is over 91.40% and the NOx emission is 625 ~ 763mg / m3. No slagging phenomenon is found on the water wall and the superheater in the furnace.