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借助于数值模拟的方法,完成了蓄热烧嘴的优化设计,分析了蓄热式烧嘴关键结构——空气和煤气喷口距离及入射角度对燃烧流场、温度场和浓度场的影响,结果表明:(1)烧嘴喷口距离在15D～20D间调整和角度在3°～9°间改变对炉内整体温度水平和温差大小结果影响不大,燃烧高温区主要集中在炉膛的中部,温度梯度较小,温度分布很均匀,炉膛中心区域内温度差在100℃以内。(2)烧嘴喷口间距小时,喷口角度不宜过大,否则会出现燃烧不完全现象。当烧嘴喷口间距过大时,喷口角度不能过大也不能过小。综合分析确定烧嘴结构在18D、5°组合状态下燃烧效果最优,性能最稳定。最后通过实验证明实验烧嘴炉内温度场和浓度场分布规律与计算结果一致。
By means of numerical simulation, the optimization design of regenerative burner was completed, and the key structure of regenerative burner was analyzed. The influence of distance and incident angle of air and gas jet on combustion flow field, temperature field and concentration field was analyzed. The results The results show that: (1) The adjustment of the burner spout distance between 15D and 20D and the change of the angle between 3 ° and 9 ° have little effect on the overall temperature level and temperature difference in the furnace. The high temperature combustion zone is mainly concentrated in the middle of the furnace, Gradient is small, the temperature distribution is very uniform, the center of the furnace temperature difference within 100 ℃. (2) burner nozzle spacing is small, the nozzle angle should not be too large, otherwise there will be incomplete combustion phenomenon. When the burner nozzle spacing is too large, the nozzle angle can not be too large can not be too small. Comprehensive analysis to determine the burner structure in the 18D, 5 ° combination under the optimal combustion conditions, the most stable performance. Finally, the experimental results show that the distribution of temperature field and concentration field in the experimental burner are consistent with the calculated results.