摘要
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 large wall temperature difference and high NOx emission of W-shaped radiant tubes, this article in-troduces a kind of W-shaped radiant tube with flue gas circulation. A mathematical model of the radiant tube is established and the ra-diant 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 ra-diant 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.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2014年第11期1552-1559,共8页
Journal of University of Science and Technology Beijing
基金
"十二五"国家支撑计划资助项目(2011BAE13B09)
关键词
辐射管
流动传热
烟气
温度
氮氧化物
气体排放
数值模拟
radiant tubes
heat transfer
flue gas
temperature
nitrogen oxides
gas emission
numerical simulation
