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为了解决常规直燃式热处理炉中存在的工件表面氧化问题,本文基于Navier-Stokes方程,在烧嘴处设计了收缩-扩张空气通道结构,在炉墙内设置了烟气回流通道与烧嘴喉部相连,开发出防氧化燃烧技术。为了对该技术进行整体优化,通过数值仿真的方法计算了多种结构、多种工况下常规与防氧化的直燃式热处理炉在同工况下的温度场及氧浓度场。仿真结果表明,防氧化炉的炉膛平均温度降低至常规炉的93%~97%,高氧区面积降低至常规炉的35%~41%。以优化后的结构和工况为依据,将防氧化燃烧技术应用于工业生产,现场实测数据表明表面氧化率降低至常规炉的34%~50%。
In order to solve the problem of surface oxidation in the conventional direct-fired heat treatment furnace, based on the Navier-Stokes equation, a contraction-expansion air channel structure is designed at the burner, and a flue gas return channel and a burner throat Ministry connected to the development of anti-oxidation combustion technology. In order to optimize the technology, the temperature field and oxygen concentration field under different conditions of conventional and oxidation-resistant direct-fired heat-treatment furnace under various conditions were calculated by numerical simulation method. The simulation results show that the average temperature of the furnace in the oxidation prevention furnace is reduced to 93% -97% of the conventional furnace, and the area of the high oxygen zone is reduced to 35% -41% of the conventional furnace. On the basis of the optimized structure and working conditions, the anti-oxidation combustion technology is applied to industrial production. Field measured data show that the surface oxidation rate is reduced to 34% -50% of the conventional furnace.