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为改善辐射管热效率,本文设计了一个扁双P型辐射管,选取辐射管中心管截面长半轴A与短半轴B的比例为1.0、1.1、1.2、1.3和1.4五种扁形度,借助于FLUENT软件就扁形度对辐射管传热性能的影响进行研究.结果表明:在保持双P型辐射管换热表面积不变的情况下,随着双P型辐射管扁形度的增加,辐射管对带钢的辐射角系数增大,辐射管对炉内辐射换热量增加,辐射管热效率升高;但是,随着双P型辐射管扁形度的增加,辐射管表面温差逐渐增大,扁形度达到1.3后,表面温度不均匀系数显著增加.综合考虑辐射管的表面温差和辐射热效率,扁形度为1.2的扁双P型辐射管性能较优,与扁形度为1.0时(即辐射管未被压扁的时候)相比,表面温度均匀性几乎不变,而辐射管热效率提高约1%.
In order to improve the thermal efficiency of the radiant tube, a flat bipolar P-type radiant tube is designed in this paper. The ratio of the major axis A to the minor axis B of the central section of the radiant tube is chosen as 1.0, 1.1, 1.2, 1.3 and 1.4. The effect of flatness on the heat transfer performance of the radiant tube was studied in FLUENT software.The results showed that with the increase of the flatness of the double P type radiant tube, The radiating angle coefficient of the strip increases, the radiating tube heat radiation on the furnace increases, the thermal efficiency of the radiant tube increases; however, with the increase of the flatness of the double P-type radiating tube, the temperature difference on the surface of the radiant tube increases gradually, When the degree reaches 1.3, the nonuniformity of surface temperature increases significantly.According to the surface temperature difference and radiant thermal efficiency of the radiating tube, the flat double P type radiating tube with flatness of 1.2 has better performance and the flatness of 1.0 When crushed), the surface temperature uniformity is almost unchanged, while the thermal efficiency of the radiant tube is increased by about 1%.