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本文研究了一次风风速对高温预热空气下的煤粉MILD燃烧的影响。首先通过与国际火焰研究基金会(IFRF)的煤粉MILD燃烧实验数据对比,验证了数值模拟方法的可行性。然后在不同一次风入射角(0°、+5°和-5°)下,保持一次风风量不变,通过改变管径将风速从26 m/s增至48 m/s。研究发现,当一次风与二次风平行(0°)或背离(+5°)入射时,提高一次风风速会使炉内的峰值温度下降;当一次风朝向(-5°)二次风入射时,提高速度会使炉内温度峰值先下降后升高。总体而言,一次风与二次风背离入射时,温度峰值最低;一次风朝向二次风入射时,温度峰值最高。
This paper studies the effect of primary air velocity on the combustion of pulverized coal MILD under preheated air at high temperature. Firstly, the feasibility of the numerical simulation method is verified by comparing with the IFRF pulverized coal MILD combustion experiment data. The air volume was then maintained at different primary air angles (0 °, + 5 ° and -5 °), and the wind speed was increased from 26 m / s to 48 m / s by changing the pipe diameter. The results show that when the primary air is incident on the secondary air parallel (0 °) or away from (+ 5 °), increasing the primary air velocity will decrease the peak temperature in the furnace. When the primary air is oriented at (-5 °) When entering, increasing the temperature will make the furnace temperature drop first and then increase. In general, the temperature peak is the lowest when the primary air diverges from the secondary air and the peak temperature when the primary air is incident on the secondary air.