In order to improve the efficiency and save energy of tube furnace, the influence of oxygen-enriched combustion technology with flue gas recirculation on combustion characteristics of 2# tube furnace was studied. The research showed that the oxygen-enriched combustion technology with flue gas recirculation could improve the theoretical combustion temperature of furnace, reduce the concentration of NO emission, reduce the heat loss of flue gas, and improve heat efficiency of furnace. The heat efficiency of the 2# tube furnace was increased by 2.09％～4.09％ after using oxygen-enriched combustion technology with flue gas recirculation, under the condition that oxygen enriched air preheating temperature was 155 ℃ and the flue gas emission temperature was 120 ℃. When the oxygen concentration was 24％ and the volume reflux ratio of flue gas was 32.57％, the formation rate of NO was 1.26 mg· (m3·s) -1, the heat loss of flue gas was reduced by 1 583.70 kJ/ (1 Nm3gas), and the thermal efficiency of 2# tube heating furnace was increased by 3.48％.%为实现加热炉节能增效, 研究了烟气回流掺氧助燃技术对2#管式加热炉燃烧特性的影响.采用烟气回流掺氧助燃技术, 可提高加热炉燃气理论燃烧温度、降低NO排放浓度、减少排烟热损失、提高加热炉热效率.在富氧空气预热温度为155℃、排烟温度为120℃的条件下, 烟气回流掺氧助燃技术可使2#管式加热炉热效率提高2.09％～4.09％.当掺氧浓度为24％、排烟体积回流比为32.57％时, 燃气理论燃烧温度下NO生成速率为1.26 mg· (m3·s)-1, 排烟热损失减少1 583.70 kJ/ (1 Nm3燃气), 2#管式加热炉热效率提高3.48％.
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