Temperature uniformity of steel strip during continuous annealing process based on internal and external coupled heat transfer simulation of radiant tube

doi:10.13251/j.issn.0254-6051.2023.06.042

Abstract

Abstract: Aiming at the problem of steel strip temperature uniformity during the heating process of radiant tube in vertical steel strip continuous annealing furnace, a coupled model of flow, combustion and heat transfer inside and outside the tube of W-type radiant tube and an unsteady heat conduction model inside the steel strip were established. The effect of temperature distribution on the surface of the radiant tube on temperature uniformity of the steel strip was studied by simulation. The results show that during the heating-up process of the steel strip, the temperature distribution in the width direction is concave, which is related to the high temperature at both ends of the radiant tube and the radiant adiabatic effect of the furnace wall, the temperature difference increases first and then decreases gradually, and the maximum temperature difference of a 1200 mm wide steel strip in the middle stage of heating can reach 13.6 ℃. The temperature difference in the width direction of the strip increases slowly at first and then decreases rapidly with the increase of the strip width. When the strip width is small, the temperature difference in the width direction increases with the increase of power, and the opposite is true when the strip width is large. When the width of the strip is close to the length of radiant tube, the temperature difference in the width direction of the strip is the smallest, which can be reduced to within 5 ℃. In the early stage of heating, the surface temperature of the radiant tube is the most uneven, and in the middle stage of heating, the temperature difference in the width direction of the strip is the largest.

Key words: annealing furnace, steel strip, radiant tube heating, radiant heat transfer, temperature uniformity

CLC Number:

TK124

Hu Ye, Jiang Zeyi, Zhang Xinru, Zhao Yantao. Temperature uniformity of steel strip during continuous annealing process based on internal and external coupled heat transfer simulation of radiant tube[J]. Heat Treatment of Metals, 2023, 48(6): 249-257.

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