【摘要】 尽管高温空气燃烧技术被广泛地应用于工业炉中,但对高温空气燃烧的火焰特性以及氮氧化物生成机理还不是很清楚。研究目的是使用数值模拟方法来分析燃气/空气喷射速度比对NOX生成的影响。结果表明随着燃气/空气喷入速度比的增大,火焰峰值温度略有上升,但炉内温度分布趋于均匀,NOX的排放量从fuel/air=0.6时的202×10(3%O2)下降到6fuel/air=2.4的111×10。6另外进行了非稳态燃烧过程数值模拟,表明仅在烧嘴换向瞬间,火焰峰值温度波动较大,而炉内平均温度和NOX的排放量波动不大。更多还原

【Abstract】 Although high temperature air combustion (HTAC) technology is widely used in industrial furnace, it is not clearly about the flame characteristic and NO formation mechanism in HTAC. The object of this paper is to study the effect of fuel/air injecting velocity ratio on NO emission in nonpremixed combustion using numerical simulation method. It was found that the flame temperature went up a little with fuel/air injecting velocity ratio increasing, but the temperature uniformity went better in the whole furnace. The emission of NO decreased from 202€?0 (3%O) at V/V=0.6 to 111€?0 at V/V=2.4. The simulation of unsteady combustion prcocess was also carried out. The results demonstrated that the flame temperature fluctuate obviously at the time of switch valve changeover, but the mean temperature in the furnace and the NO emission just had a little fluctuation.更多还原