基于加热炉多场耦合传热的板坯加热均匀性

Slab Heating Uniformity Based on Multi-field Coupling Heat Transfer in Reheating Furnace

针对某钢厂步进式加热炉建立了炉内燃烧、烟气流动、烟气和钢坯传热的全耦合三维模型,采用动网格方法模拟钢坯运动.重点分析了炉内烟气与钢坯耦合传热、钢坯温度均匀性及不同垫块结构(一字型垫块、千岛式垫块、错位梁)时钢坯温度的分布规律.研究结果表明:所提加热炉数学模型能够准确描述炉内燃烧、湍流和传热过程;垫块结构对钢坯温度分布具有决定性影响,千岛式垫块、错位梁分别能减少40%和50%的黑印温差.该数学模型解决了步进梁、钢坯、垫块和水管立柱等复杂结构的钢坯运动问题和加热炉与钢坯的共轭传热问题.

A three-dimensional model,which fully coupled the combustion,flue gas flow,flue gas and billet heat transfer in an eight-staged walking beam reheating furnace in a steel plant was established.The billet motion was simulated by the dynamic mesh method.The heat transfer between flue gas and billet in furnace,temperature uniformity and temperature distribution of billet under different cushion structures(i.e.,a column of cushion block,thousand island cushion block and dislocation beam)were analyzed.The results show that the proposed numerical model for reheating furnace can accurately simulate the combustion,turbulence and heat transfer processes.The structure of cushion block has a decisive influence on the temperature distribution of the billet.Thousand island cushion block and dislocation beam can reduce the temperature difference of skid marks by 40%and 50%,respectively.The numerical model can successfully solve the problems of billet movement and the coupled heat transfer between flue gas and billet for the complex structures like walking beam,billet,pad block and water pipe column in walking beam reheating furnace.