在热流密度不变时,正交试验结果表明,当空气过剩系数为1.1,氧化剂预热温度为1200 k,烟气再循环率为30%,与氧化剂入口截面积比为0.5，焦炉的氮氧化物生成立火道是最低,这是44 mg/m³。符合NOx排放标准。烟气外循环对立火道中NOx的形成有显著影响。而空气过剩系数、氧化剂预热温度和氧化剂进口截面积的比例对NOx的形成没有明显影响。

When the heat flux is constant, the orthogonal test results show that when the excess coefficient of air is 1.1, the oxidizer preheating temperature is 1200 K, the flue gas recirculation rate is 30%, and the cross-sectional area ratio of oxidizer inlet is 0.5, the nox formation of coke oven is the lowest, which is 44 mg/m3. Meet NOx emission standards. The external circulation of flue gas has a significant effect on NOx formation. However, air excess coefficient, oxidizer preheating temperature and the proportion of oxidizer inlet cross-sectional area have no significant effect on NOx formation.