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为解决W型辐射管温度均匀性差和NOx排放过高的问题,提出了一种新型带烟气循环的W型辐射管,建立了该辐射管的数学模型,并运用数值计算的方法进行了模拟研究.在验证模型可靠的基础上,对带烟气循环的W型辐射管和常规W型辐射管的流场、温度场和NOx排放进行了比较.结果表明:带烟气循环的W型辐射管气体平均流速是常规W型辐射管气体流速的3倍,有57.6%的烟气参与再循环;带烟气循环的W型辐射管中气体燃烧最高温度为2260 K,比W型辐射管低192K;带烟气循环的W型辐射管壁面温差为166 K,比常规W型辐射管的壁面温差小76 K;带烟气循环的W型辐射管的NOx排放量9.9×10-5,而W型辐射管的NOx排放达到7.98×10-4,高出将近7倍.
In order to solve the problem of poor uniformity of temperature and high NOx emission of W-type radiant tube, a new type of W-type radiant tube with flue gas circulation is proposed. The mathematical model of the radiant tube is established and numerically simulated Based on the reliable verification model, the flow field, temperature field and NOx emission of W-type and W-type radiant tubes with flue gas circulation were compared.The results show that W-type radiation with flue gas circulation The average gas flow rate was 3 times that of the conventional W type gas tube, with 57.6% of the flue gas participating in the recycle. The maximum temperature of gas combustion in the W type with a flue gas circulation was 2260 K, which was lower than that of the W type radiation tube 192K; the wall temperature difference of the W-type radiant tube with flue gas circulation is 166 K, which is 76 K less than that of the conventional W-type radiant tube; and the NOx emission of the W type radiant tube with flue gas circulation is 9.9 × 10-5, NOx emission of the W-type radiant tube reaches 7.98 × 10 -4, almost 7 times higher.