Research On Inverse Problem Of Heat Transfer Based On The Temperature Measurement In Slab Continuous Casting Mould

During the processing of steel continuous casting, heat flux between mould copper plate and slab has significant effects on the slab's quality. Find out the characteristic of heat transfer and the solidification of slab exactly in real time is very important for forecast the stick breakout and slab's quality. For the limited methods of detection in the local processing, it's difficult to obtain the distribution of heat flux and the process of steel solidification in the mould, so numerical simulation become the important study way. The simulation about heat behavior and the process of steel solidification in ideal state has made a big progress, but the experiential formula present the change of heat flux only along the height direction so it can't reflect the change around transverse direction and the characteristic of non-uniform heat flux. This problem restrict the application for simulate the heat transfer based on the temperature measurement.To overcome this problem, In this paper, a mathematical model of inverse problem for heat transfer and solidification of mould/strand was established which based on the measured mould temperatures in slab continuous casting to simulate the processing of heat behavior. The temperature,heat flux and solidified shell thickness were calculated in two different slab. The influence of casting speed to heat transfer was also analysised, and the calculation method of inverse problem model was studied. The convergence behavior of model was discussed under different methods and parameters.Calculated results indicates: The inverse mathematical model in this paper can reflect heat flux and the process of steel solidification factually. In allusion to two different slabs, the calculated values of temperature from inverse mathematical model agreed well with the measured ones. Both of the methods for adjust the heat flux can made the inverse problem converged quickly and have high calculate precision; In steady continuous casting process, the heat flux decreased gradually below the meniscus, and then has little change along the height direction. It may be increase below the middle part of mould; At same height section, The non-uniform of heat flux and shell thickness around transverse direction was reflected; The heat flux between mould/strand determine the distribution of shell thickness; The higher casting speed leads to increase the mould temperature and heat flux.The inverse mathematical model could correctly reflect the real manufacturing process, provided an applicable method for researching heat transfer behavior and the 'visual mould' technology in continuous casting.