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One of the limiting factors for processing steel lines performances is the radiant tubes damage. This damage results from a combination of many parameters such as operating conditions (combustion performances, depending on burner design and control, furnace control, fuel quality and stability…) and radiant tube design (material selection, geometry, and manufacturing). Current operating conditions lead to upper temperature limit for radiant tubes, which are then exposed to several mechanisms, such as hot corrosion, creep, and thermal fatigue that ultimately may result to their failure. To improve equipment lifetime subject to severe thermal stresses it is essential to know precisely the radiant tube temperature distribution. The common approach to evaluate radiant tube lifetime is usually limited to thermal stresses calculations on the hypothesis of linear elastic behavior, based on calculated or measured temperature distribution. However, at high temperature, creep behavior implies large deformations that could change the fluid flow inside the radiant tube. A coupled analysis of fluid dynamics and thermomechanical behavior could lead to a more precise evaluation of thermal operating conditions and lifetime for radiant tubes. Thus, a development has been carried out by Fives to increase lifetime of W-shape NiCr cast radiant tube operating at temperatures up to 1000 °C. Combustion and heat transfer inside the tube are simulated using Computational Fluid Dynamics with RANS approach, for fu

مقاله ISI انگلیسی اصلی
سال انتشار:2017
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تعداد صفحات فایل ISI انگلیسی اصلی: 8 صفحه