Open AccessDevelopment of the model complex of the expert system of control and management of the slag mode in modern mixed blast furnace conditions
Author(s) -
D. N. Togobitskaya,
A. I. Bel’kova,
Dmytro Stepanenko,
N.A. Tsyupa,
Yu.M. Likhachev
Publication year - 2020
Publication title -
fundamentalʹnye i prikladnye problemy černoj metallurgii/fundamental and applied problems of ferrous metallurgy
Language(s) - English
Resource type - Journals
eISSN - 2786-6149
pISSN - 2522-9117
DOI - 10.52150/2522-9117-2020-34-30-46
Subject(s) - slag (welding) , ground granulated blast furnace slag , blast furnace , viscosity , coke , basic oxygen steelmaking , metallurgy , combustion , smelting , materials science , chemistry , steelmaking , composite material , cement , organic chemistry
The aim of the work is to develop physicochemical bases for predicting the technological properties of finite blast furnace slags, algorithmic and software for the subsystem for diagnosing the slag regime of blast furnace smelting. Based on experimental data on the properties of natural finite blast furnace slags, predictive models for calculating the viscosity of the final slag at a temperature of 1400-1550 °C were improved by including in the model structure an integrated slag melt index of the parameter Δe, which reflects the individual effect. Using the integral parameters of the slag melt characterizing the charge state of the system Δe and the structure of the slag ρ, an equation was developed to determine the viscosity of the slag at any temperature corresponding to the slag temperature at the cast iron outlet. As a result of analytical research, a predictive model for determining the enthalpy of slag depending on the integral parameters Δe and ρ and the temperature of the melt has been developed. It is shown that the viscosity characterizes the fluidity of the slag and provides desulfurizing and drainage properties. The calculation of the viscosity for the specified production of pig iron by the chemical composition of the slag is carried out according to the basic model of slag in a conditionally "homogeneous" state and taking into account its heterogeneity. This takes into account the presence of macroheterogeneous inclusions formed when using coke with low strength characteristics and due to incomplete combustion of pulverized coal fuel in the blast furnace. The improved models for evaluating the viscosity and enthalpy of the final slag are software implemented in the new version of the «Slag» system for operational control of the slag mode of blast furnaces in Ukraine. Rapid assessment of the slag mode using the «Slag» system as part of the DCS allows you to effectively and at a modern level solve the problems of optimizing the slag mode and the quality of pig iron in modern conditions of blast furnace smelting.