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为降低双P型辐射管NO_x排放,运用扩散式分段燃烧的低NO_x均匀化燃烧技术,设计一种辐射管三级燃烧器,对其进行数值模拟,经过验证模型可靠.对燃烧器结构及运行参数进行正交试验和单因素研究.研究表明:空气预热温度、空气分级配比和空气过剩系数对出口NO_x排放浓度有显著的影响,相互无交互作用;一次风量由10%增大到20%时NO_x生成量由65.2×10-6增加到108.2×10-6,一次风量增加到30%以上时出口NO_x体积分数增加速率趋缓;空气预热温度每增加100℃,最高燃烧温度增加约50℃,排放气体中NO_x体积分数由50.9×10-6以22%、23.2%、25.3%、27.2%、27.3%和29.5%的速率增加;随空气过剩系数增加,出口NO_x体积分数由82×10-6呈22.1%、1.9%、2.1%、24%和2.5%的波动增长趋势.
In order to reduce the NO_x emission of dual P-type radiant tubes, a three-stage radiant tube burner was designed by using diffusion-type low-NO_x homogeneous combustion technology and its numerical simulation was carried out. The verified model was reliable. Operating parameters were studied by orthogonal test and single factor study.The results showed that air preheating temperature, air grading ratio and air excess coefficient had a significant effect on the NO_x emission concentration of the outlet without mutual interaction. The primary air volume increased from 10% The NO_x production increased from 65.2 × 10-6 to 108.2 × 10-6 at 20%. When the primary air volume increased to more than 30%, the increasing rate of NO_x volume fraction at the outlet slowed down. For every 100 ℃ air preheating temperature increase, the maximum combustion temperature The NO_x volume fraction in the exhaust gas increased from 50.9 × 10-6 to 22%, 23.2%, 25.3%, 27.2%, 27.3% and 29.5% with the increase of about 50 ℃. With the increase of air excess coefficient, the volume fraction of NO_x 82 × 10-6 showed a trend of fluctuation of 22.1%, 1.9%, 2.1%, 24% and 2.5%.