步进式加热炉富氧MILD燃烧流场与温度场的数值模拟

Simulation study on the flow and temperature field of Oxy-MILD in walking heating furnace

针对富氧MILD燃烧步进式加热炉,应用Fluent软件建立了炉内流动与传热的数学模型,对加热炉内流场、温度场进行了数值模拟,得到了炉内详细的速度温度分布.结果表明:侧烧嘴加装高速氧枪可以实现加热炉富氧MILD燃烧.高速射流卷吸大量烟气形成巨大的回流区流场,其卷吸率最高可达21.高速射流在卷吸作用下速度急剧下降,1 m内从220 m/s下降为30 m/s.炉内温度分布均匀,无集中高温区,预热段平均温度为1175 K,加热段平均温度为1521 K,均热段平均温度为1580 K.

A mathematical model of flow and heat transfer in a stepping heating furnace with oxy-MILD combustion was established using Fluent.The flow field and temperature field in the reheating furnace were numerically simulated,and the detailed velocity and temperature distribution in the furnace were obtained.The results show that the oxy-MILD combustion can be realized by adding high speed oxygen lance on the side burner.The high speed jet absorbs a large amount of flue gas to form a huge backflow flow field,with the up to 21.The velocity of high-speed jet decreases sharply,from 220 m/s to 30 m/s within 1 m.The average temperature in the preheating section is 1175 K,the average temperature in the heating section is 1521 K,and the average temperature in the soaking section is 1580 K.