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本文首先对双P型辐射管进行实验和数值研究,发现除NOx含量的误差偏大外,其他参数的偏差都在1%以内,证明该模型具有一定的可靠性.在此基础上,将空气分级的理念应用于双P型辐射管,提出一种带支管喷口的分区分级燃气辐射管,并建立相应的数学和物理模型.对比双P型辐射管和分区分级辐射管的模拟结果显示:分区分级燃气辐射管和双P型辐射管内气体的平均流速分别为25.8 m·s~(-1)和21.0 m·s~(-1),热效率分别为65.9%和64.2%;分区分级燃气辐射管壁面最高温度为1047℃,壁面最大温差为73℃,比双P型辐射管降低15℃,分区分级后气体平均流速增大,提高了直管和回流管管段的烟气温度和壁面温度,具有更好的温度均匀性.
In this paper, experimental and numerical studies on double P-type radiant tubes are carried out. The results show that the deviation of other parameters is within 1% except for the large error of NOx, which proves that the model has certain reliability. On the basis of this, The concept of grading is applied to double P type radiant tubes, and a new type of graded gas radiant tubes with branch nozzle spout is proposed, and the corresponding mathematical and physical models are established.Compared with the double P type radiant tubes and the graded radiant tubes, the simulation results show that: The average velocity of the gas in the graded gas and double P type radiant tubes was 25.8 m · s -1 and 21.0 m · s -1, respectively, and the thermal efficiencies were 65.9% and 64.2% respectively. The graded gas radiant tubes The highest wall temperature is 1047 ℃, the maximum wall temperature difference is 73 ℃, which is 15 ℃ lower than that of double P type radiant tubes. The average gas velocity increases after the classification grading, and the flue gas temperature and wall temperature of straight pipe and return pipe are increased. Better temperature uniformity.