空气预热温度对管式加热炉燃烧性能影响的研究

Influence of Preheated Air Temperature on Combustion Performance in Tube Furnace

为了减少管式加热炉燃烧NOx的排放和提高加热炉的燃烧效率,实现加热炉的高效低氮燃烧,以某石化公司的F1001常压炉为研究对象,建立了常压炉物理模型,选用标准k-ε模型、非预混合湍流扩散燃烧PDF模型、P-1辐射模型、NOx生成模型对加热炉内的燃烧过程进行了数值模拟研究。研究结果表明:提高空气预热温度可以扩大炉内的高温区域,有利于炉管内原油的加热;燃烧NOx生成量和炉管出口油温随空气预热温度的升高而增大,当空气预热温度超过240℃时,NOx生成量急剧增大,所以空气预热温度以240℃为宜,此时NOx生成量为137 mg/m3,低于国家标准200 mg/m3。炉膛温度和出口油温测量值与模拟值进行了比较,二者吻合较好。研究结果为某企业常压炉的运行监控提供了参考依据。

In order to reduce the emission of NOx and improve the combustion eMc^ency m tube furnace, a physical model was established. The standard k -E model, non -premixed turbulent diffusion combus- tion PDF model, P - 1 radiation model and NOx generation model were chosen to simulate the combustion process of tube furnace by the software FLUENT. The results show that the improvement of air preheated temperature can expand the high temperature region in the furnace and be beneficial to heating oil in tubes. The amount of NOx and the temperature of the oil increased as the air preheated temperature raised, and when the air preheated temperature exceeded 240℃, the amount of NOx would increase rap- idly. The best air preheated temperature for the tube furnace is 240℃. When air preheated temperature is 240℃, the amount of NOx is 137 mg/m3, which is below the national standard 200 mg/m3. The simula- ted results of temperature in the furnace and the oil temperature of outlet of tube furnace were compared with measure data, which shows a good agreement with measure data. The result of the research can pro-vide a reference for the operation monitor of the tube furnace in a petrified factory.