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以某炼油厂在役管式加热炉为研究对象,应用计算流体力学软件Fluent,研究了燃气分级比Φ(分级燃气与总燃气的质量之比)为0、0.2、0.3、0.4和0.5时,5种不同工况下辐射段内相关参数的变化规律。结果表明,随着燃气分级比的增加,炉内速度与温度分布均匀性改善,辐射段的传热性能明显增强,火焰由粗短变为细长,火焰高度增加,污染物排放明显下降。综合考虑火焰刚性、传热和NO排放浓度,Φ=0.4可作为燃烧器设计与现场调节的优化参考值。
Taking the reheating furnace in the service of a refinery as the research object, CFD software Fluent was used to study the gas classification ratio Φ (the ratio of the mass of staged gas to the total gas) was 0, 0.2, 0.3, 0.4 and 0.5. Variation of relevant parameters in 5 radiation sections under different operating conditions. The results show that with the increase of gas classification ratio, the uniformity of velocity and temperature distribution in the furnace is improved, the heat transfer performance of the radiation section is obviously enhanced, the flame is changed from short to short, the flame height increases, and the pollutant emission drops obviously. Considering flame rigidity, heat transfer and NO emission concentration, Φ = 0.4 can be used as an optimal reference for burner design and field adjustment.