高碳钢线材轧后水冷换热过程的有限差分模拟

Finite Difference Simulation on Water Cooling Heat Exchanging Process of High Carbon Steel Wire Rods after Rolling

根据82B和72A钢Φ5.5～12.5mm高速线材轧后水冷传热特点,将水冷过程分成3个区域,并在水冷箱区域中根据环形喷嘴的开关状态,分别采用了水对流换热和水蒸气对流换热两种形式传热模型,建立了水冷过程按喷嘴个数分段处理的边界条件,通过有限差分模拟得出轧后水冷系统中线材断面的温度分布。通过实测温度值校正高碳钢线材水冷过程中水的对流换热系数,模拟结果表明,精轧机入口和吐丝机的预报和实测线材表面温度均值的绝对误差在±20℃以内。

Based on the characteristics of water cooling heat transfer of steel 82B and 72A Ф5.5 - 12. 5 mm high speed rolled wire rods after rolling, with dividing water cooling process to 3 zones and according to open/close state of circle water nozzles, the boundary conditions according to nozzle number to deal with water cooling process in zones have been established by using two heat transfer models of water forced convection and water vapor convention heat transfer, and the temperature distribution .of wire rod cross section after rolling in water cooling system is obtained by finite difference simula- tion. With real measured temperature value to correct the convection heat-transfer coefficient of water in water cooling process of high carbon steel wire rods, the simulation results show that the absolute error of average value between predicted and measured wire rods surface temperature at inlet of finishing rolling mill and at wire nozzle is within ± 20 ℃.