The Numerical Simulation And Optimization Research Of Steel Billet Stack Cooling Process

Steel billet stack cooling is an important process to ensure the quality of heating and rolling before carried into furnace. It's very significant to analyze billet's temperature decreasing law for reducing the energy consumption of rolling process. A mathematical stack cooling model was established in rolling process line 1# of Xiangtan Iron and Steel Group which includes the standardκ-εand bossinesq model for convection and the DTRM model for radiation based on the FLUENT software.Numerical calculation and optimization testing by orthogonal experiment show that:1.The surface,internal and average temperature of billet follow the exponential decay law:T=Ta+Ae-Bt during cooling process. Billet's temperature meet the parabolic distribution law:T(x,t)=-Cx(t)x2+TG(t) and T(y,t)=-Cy(t)y+TG(t) in length and width direction respectively.2.The billet temperature uniformity increased gradually during cooling process through the analysis of the temperature uniformity coefficient:3.Optimum condition is staggered arrangement, spacing 1m, stack height 4m, inlet velocity 0.1 m/s, air temperature 40℃. Compared with normal condition, the output of 3# furnace increased 12.47% and the unit consumption reduced 11.76% under optimum condition which has great application value because of the production-increasing and energy-saving benefit.