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本文系统地阐述了夹心风燃烧器的工作原理及其混合特性。为了充分发挥向火侧一次风射流的着火优势,提出了向火侧一次风喷口带单折过扩口的夹心风Ⅱ型燃烧器。模型试验及工业性试验表明:Ⅱ型燃烧器向火侧一次风射流明显迎向上游高温烟气流,外卷吸增强,射流混合边界层增厚,着火条件显著改善。根据冷态试验的结果,对热态原型进行推算,燃用江西劣质烟煤时,煤粉射流离喷口后的无因次距离l/B在1.2～1.8的范围内能实现稳定着火,炉内温度水平提高100℃以上,取得了满意的经济效果。
This paper systematically expounds the working principle and mixing characteristics of a sandwich-type air burner. In order to give full play to the fire side of the first jet of fire advantage, proposed to the fire side of the primary jet nozzle with a single flare expansion of the sandwich wind type II burners. The model tests and industrial tests show that the type Ⅱ combustor faces the upstream high-temperature flue gas flow obviously, the outer entrainment increases, and the jet mixing boundary layer thickens and the ignition conditions are significantly improved. According to the results of the cold test, the hot prototype is estimated. When Jiangxi low-grade bituminous coal is fired, the dimensionless distance l / B of the pulverized coal jet from the nozzle can achieve stable ignition within the range of 1.2 to 1.8, and the temperature in the furnace Increase the level of more than 100 ℃, and achieved satisfactory economic results.