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以热轧厂加热炉中步进梁立柱管为模型,考虑在均温为1 573 K的加热炉内,立柱管在流体冷却过程中的共轭传热问题。建立了耐火材料、立柱和冷却介质的三维耦合模型。采用单向直接耦合分析法,对立柱中流体流动传热及立柱管耦合换热过程进行数值模拟。通过计算得到步进梁立柱管的温度分布图及其分布规律,从而找出立柱管危险截面的位置。仿真结果表明:立柱管在经过加热冷却后,温度最终达到510 K左右,符合管道温度设计要求,但管壁温度分布不均,局部出现明显高温,可能导致其破裂失效。
Taking the stepping beam vertical column tube in the hot rolling mill as a model, the conjugate heat transfer problem of the column tube in the cooling process of the fluid in the heating furnace whose average temperature is 1 573 K is considered. A three-dimensional coupled model of refractory material, column and cooling medium was established. One-way direct coupling analysis was used to simulate the fluid heat transfer and column-tube heat transfer in column. Through the calculation, the temperature distribution chart and the distribution rule of the riser pipe are obtained, so as to find out the location of the dangerous section of the riser pipe. The simulation results show that after the heating and cooling, the temperature reaches to 510 K, which meets the requirements of pipe temperature design. However, the pipe wall temperature distribution is uneven and the local high temperature may lead to rupture failure.