中厚板超快速冷却条件下的温度模型

Temperature Model Under the Plate Ultra Fast Cooling Condition

结合中厚板轧后超快速冷却的工业实践,以传热学为基础,利用有限元法开发了中厚板轧后超快速冷却过程的一维温度场模型。为了同时满足在线模型的精度和实时性要求,在建模过程中采用了逐层细分法对钢板的厚向进行表面密集、心部稀疏的离散化处理;在求解过程中采用了变步长模型对时间步长进行动态调整。将该模型应用于工业现场,获得了钢板在超快速冷却条件下的水冷温降曲线和瞬时温度分布。现场应用表明,钢板终冷温度的计算值与实测平均值吻合较好,两者的偏差在±15℃以内,满足了新一代TMCP工艺的生产需求。

Based on the heat transfer principle and combined with the industrial practice of the plate ultra fast cooling process, one dimensional temperature field model was developed by using the finite element method. In order to satisfy the accuracy and the real-time requirements of the on-line model at the same time, the method of refined layer by layer was used to discrete the thick direction with intensive surface, sparse center during the modeling process. Thereafter, the variable step-size model was used to adjust the time-step dynamically during the solution process. Applying this model to the industrial practice, the temperature history curve and the instantaneous temperature field under the ultra fast cooling condition were calculated. The on-line application of the proposed model indicates that the calculated value of the stop cooling temperature is in agreement with the measured one. The deviation between them is less than ±15 ℃. Therefore, the proposed model can satisfy the production requirements of the new genera tion TMCP.