建立了柱流多旋顶燃式热风炉空煤气燃烧和NOx排放的三维物理数学模型,对炉内燃烧速度场、温度场、浓度场及NOx排放进行了仿真研究.结果表明:燃烧室出口截面速率分布均匀;通过设置不同倾斜角度的混合烧嘴,使得炉内O2和CO混合充分,燃烧效果好,燃烧室出口截面的最高CO浓度为33.2×10-6,最高O2浓度为19.4×10-6,最高NOx浓度为14.8×10-6;火焰在混合烧嘴内形成,在扩张段区域消失,火焰长度较短;燃烧室出口截面温度分布均匀,最大温差为16 K.
Numerical Simulation of Combustion Process of Column Flow Multi-Rotary Top Burning Hot Blast Stove
A three-dimensional physical and mathematical model was established for the combustion of air gas and NOx emissions in a column flow multi rotation top burning hot blast stove.The velocity field,temperature field,concentration field,and NOx emissions during the combustion process in the hot blast stove were simulated and studied.The results show that the velocity distribution is uniform at the exit section of combustion chamber.By setting the mixing burners with different tilt angles,the O2 and CO in the furnace are fully mixed,resulting in good combustion efficiency.The maximum CO concentration at the outlet section of the combustion chamber is 33.2×10-6,and the maximum O2 concentration is 8.6×10-6.The highest concentration of NOx is 14.8×10-6.The flame is formed in the mixing burner and disappears in the expansion area,and the flame length is shorter.The temperature distribution at the outlet section of the combustion chamber is uniform,and the maximum temperature difference is 16 K.
top burning hot blast stoveflow fieldconcentration fieldtemperature fieldnumerical simulation
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