【摘要】 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%。更多还原

【Abstract】 In order to solve surface oxidation problems in conventional direct-fired heat treatment furnaces,contraction-expansion air channel structures in burners are designed based on the Navier-Stokes equation. Flue gas reverse flow channels in furnace walls are connected to nozzle throats and anti-oxidation combustion technology is developed. Besides,numerical simulation is used to calculate temperature and oxygen concentration fields between conventional and anti-oxidation furnaces under the same conditions in different structures and operating conditions for optimization of the proposed furnace. According to the simulation results,average temperature of anti-oxidation furnace chamber is reduced by 93%-97% and high oxygen areas are reduced by 35%-41%,comparing to the results of the conventional furnaces.The design in this study was used in industrial productions based on the optimized structures and operating conditions. The experimental results showed that surface oxidation rate of the proposed furnace was reduced by 34%-50%.更多还原