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帶煙氣循環的W型輻射管流動傳熱及NOx排放特性

Flow heat transfer and NOx emission characteristic of W-shaped radiant tubes with flue gas circulation

  • 摘要: 為解決W型輻射管溫度均勻性差和NOx排放過高的問題,提出了一種新型帶煙氣循環的W型輻射管,建立了該輻射管的數學模型,并運用數值計算的方法進行了模擬研究.在驗證模型可靠的基礎上,對帶煙氣循環的W型輻射管和常規W型輻射管的流場、溫度場和NOx排放進行了比較.結果表明:帶煙氣循環的W型輻射管氣體平均流速是常規W型輻射管氣體流速的3倍,有57.6%的煙氣參與再循環;帶煙氣循環的W型輻射管中氣體燃燒最高溫度為2260 K,比W型輻射管低192 K;帶煙氣循環的W型輻射管壁面溫差為166 K,比常規W型輻射管的壁面溫差小76 K;帶煙氣循環的W型輻射管的NOx排放量9.9×10-5,而W型輻射管的NOx排放達到7.98×10-4,高出將近7倍.

     

    Abstract: In order to solve the large wall temperature difference and high NOx emission of W-shaped radiant tubes, this article introduces a kind of W-shaped radiant tube with flue gas circulation. A mathematical model of the radiant tube is established and the radiant tube is studied by the method of numerical calculation. On the basis of the model's reliability, the velocity field, temperature field and NOx emission are compared between the radiant tube and a conventional W-shaped radiant tube. The average gas velocity of the new radiant tube is three times that of the conventional radiant tube, and 57.6% flue gas is involved in recombustion in the new radiant tube. The maximum combustion temperature of the new radiant tube is 2260 K, which is 192 K lower than that of the conventional radiant tube. The wall temperature difference of the new radiant tube is 166 K,which is 76 K lower than that of the conventional radiant tube. The NOx emission of the new radiant tube is 9.9×10-5, but the NOx emission of the conventional radiant tube is 7.98×10-4, nearly seven times higher.

     

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