Development Of Decarburization Model And Temperature Model In A RH Refining Process

The purpose of this paper was to improve RH process and efficiency for a RH refining process so that RH decarburization model and temperature model were established.The influencing factors were analyzed by a decarburization model and a temperature model together with a visualization program after validating the model by using the production data.The main research content in this paper can be summarized as follows:Based on the analysis of decarburization reaction kinetics and thermodynamics of RH refining process,together with the classical RH decarburization model developed by previous researchers,a RH decarburization model was built by considering the decarburization of gas-liquid interface in the vacuum chamber as well as the carbon content change because of liquid steel circulation in the ladle.Meanwhile,the oxygen effect on the decarburization was considered,A visualization model for RH decarburization was developed to meet the requirement for the practice with the help of Visual C++ 6.0 which refered to the fourth order standard Runge Kutta formula for the calculation.The temperature prediction in the RH refining process was performed by considering the effects of liquid steel temperature,especially the effects of decarburization,deoxygenation and adding alloy on the temperature.Furthermore,the effects of the vacuum chamber and ladle temperature were taken into account to build a RH refining process model for temperature prediction.To optimize the RH decarburization process,the initial carbon content was controlled below 400×10-6 and the initial oxygen content was controlled above 400×10-6 to obtain a low end-point carbon content.The vacuum system could improve the decarburization efficiency;When the argon flow was set as 1980NL/min,circulation flow was increased,in turn,the decarburization efficiency was improved.;As for temperature prediction model,the more intense decarbonization and deoxidation reaction was,the less the temperature loss was;In a 220tRH facility,blowing 100 m3 oxygen could increase the liquid steel temperature by 2.1?.Adding 200kg aluminum could increase the liquid steel temperature by 14?;Also,the model could be improved by considering the vacuum chamber and ladle heat loss.