Side Spray Annealing Furnace Aluminum Coil Temperature And Stress Field Of Numerical Simulation Studies

In the production of aluminum coil, annealing is a very important heat treatment process. Simulation study of the temperature field can provide theoretical basis for optimizing the annealing process. As there are gap and oil between the aluminum layers, the radial thermal conductivity of aluminum is uncertain. So the determination of radial thermal conductivity is very essential for the study of temperature field.Aiming at the aluminum plates' annealing experiment, the model of inverse heat conduction problems is obtained, and the radial thermal conductivity is solved by Genetic Algorithm. Based on the analysis of the heat transfer in the aluminum coil, the side-blown annealing furnace is brought up. Applying the ANSYS software, the numerical simulation of the temperature field and thermal-stress field of the aluminum coil is performed in the radial convection and side-blown aluminum annealing furnace separately. The study not only provides theory basis for designing the side-blown furnace and making the annealing process,but also has practical meaning for reduce the time of annealing process energy saving. The main tasks of this paper are as follows:(1) Based on the aluminum plates annealing experiment, applying the two node element and Galerkin, the model of IHCP with thermal conductivity unknown is obtained.(2)Applying the model of IHCP, the equivalent thermal conductivity is obtained by the Levenberg-Marquardt method, Gauss-Newton method and Genetic Algorithm respectively. Compared with the other two methods, the Genetic Algorithm can reduce the effect of the measurement error, obtain a better predicted result and also can provide new way for solving IHCPs with other unknown thermal parameters.(3)Through analysis of the heat transfer in the aluminum coil, the side-blown annealing furnace is brought up. The thermal-stress model of aluminum coil is obtained applying the thermal conductivity which is solved through IHCP above. Using ANSYS software, the numerical simulation of the thermal-stress field of the aluminum coil is performed in the radial convection and side-blown aluminum annealing furnace separately.The simulation results shows that: Comparing to the traditional radial convection aluminum annealing furnace, the temperature difference in the aluminum coil applying side-blown heating is only 0.6℃and the whole annealing process is decreased by 4h, the annealing efficiency is improved.