Управління технологічним процесом конвертерної плавки по розрахунковій температурі реакційної зони

Abstract

The article presents calculations of the current temperature of the metal reaction zone and determines its dependence on time at blowing. It has been shown that changes in the temperature of the reaction zone temperature at melting characterize the processes occurring in the bath of the converter. Analysis of the obtained dependence in real time makes it possible to quickly predict the end of oxidation [Si] and [Mn] and the content of [C] in the melt. Besides, the thermal energy of radiation makes it possible in different periods of melting to forecast and to adjust the amount flow of oxygen injected at melting, the necessity to adjust the position of the oxygen lance relative to the metal, and, what is the most important, to predict the completion of blowing. The automation systems implementing the developed model have been offered. It has been shown that it includes sensors of temperature, water and oxygen flow rate and pressure, lance position, means of communication with ACS TP converter melting, control and workstation control, as well as a set of algorithms and programs. An algorithm for calculating the current temperature of the reaction zone during melting has been developed, the algorithm taking the melt as an energy emitter. It has been established that the temperature of the reaction zone reflects through its change in different periods of melting the technological processes in the converter: the temperature of the steel melt, the intensity of the Fe oxidation in the reaction zone, [Si] and [Mn] oxidation processes, endothermic processes strengthening due to Fe oxides in slag, etc. The presented calculations and proposed possibilities of influencing the gas-blowing mode to reduce the supply of oxygen to the melt make it possible for the technologists to achieve the required reduction of steel oxidation and to reduce the deoxidizer costs when casting steel or to predict the substitution of oxygen for air without impairing bath mixing