顶燃式热风炉燃烧过程的数值模拟研究

针对某公司的旋流顶燃式热风炉及其工艺参数,建立了气体流动、传热的数学模型,采用非预混燃烧方法处理煤气的燃烧,对其现有工况进行了数值模拟,分析了炉体内部的流场、温度场和浓度场.结果表明,燃烧室温度分布不均匀,出口温度较低;由（于）空气过剩系数较小,导致煤气燃烧不充分,有大量CO剩余;火焰长度较长,严重影响格子砖的寿命.通过调整空气过剩系数,（）的增加空气过剩系数,燃烧室出口CO体积分数明显降低,火焰长度明显变短,出口温度明显提高.

Study on the Numerical Simulation of the Combustion Process in a Top Combustion Hot Air Furnace

To a given whirling top combustion hot air furnace, a mathematical model for gas flow and heat transfer was established. With non-premixed combustion method to solve the combustion, the combustion process in the furnace was simulated and the flow field, temperature distribution and concentration distribution were analyzed. The results showed that the temperature distribution in the combustion was non-uniform, and the outlet temperature was relatively too low. Furthermore, the gas burn insufficiently with a smaller air excess co- efficient, and more residual CO was observed at the outlet. In this case, the flame length was pretty long and thus the service life of checker bricks might be reduced. By adjusting the coefficient of air excess, i. e., increasing the coefficient of air excess properly, the φ（CO） at the chamber outlet was decreased obviously, the flame length was shorten significantly, and a higher outlet temperature could be obtained.