scholarly journals Development of the model complex of the expert system of control and management of the slag mode in modern mixed blast furnace conditions

2020 ◽  
pp. 30-46
Author(s):  
D.N. Togobitskaya ◽  
A.I Belkova ◽  
D.A. Stepanenko ◽  
N.A. Tsyupa ◽  
Yu.M. Likhachev
Keyword(s):  
Blast Furnace ◽  
Slag System ◽  
Homogeneous State ◽  
Pig Iron ◽  
Blast Furnace Smelting ◽  
Final Slag ◽  
Coal Fuel ◽  
Model Complex ◽  
Slag Melt ◽  
Furnace Smelting

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.

Study of a blast-furnace smelting technology which involves the injection of pulverized-coal fuel, natural gas, and an oxygen-enriched blast into the hearth

Metallurgist ◽  
2006 ◽  
Vol 50 (5-6) ◽  
pp. 235-240 ◽  
Author(s):  
A. N. Ryzhenkov ◽  
S. L. Yaroshevskii ◽  
V. P. Zamuruev ◽  
V. E. Popov ◽  
Z. K. Afanas’eva
Keyword(s):  
Blast Furnace ◽  
Natural Gas ◽  
Pulverized Coal ◽  
Blast Furnace Smelting ◽  
Coal Fuel ◽  
Pulverized Coal Fuel ◽  
Furnace Smelting

scholarly journals COMPUTER SYSTEM OF CONTROL OF SLAG MODE IN MODERN blast furnace conditions

2020 ◽  
pp. 373-377
Author(s):  
Daria Tohobytska ◽  
Alla Bielkova ◽  
Dmytro Stepanenko ◽  
Yurii Likhachov ◽  
Oleksandr Skachko
Keyword(s):  
Blast Furnace ◽  
Computer System ◽  
Slag System ◽  
Slag Viscosity ◽  
Melting Points ◽  
Blast Furnace Smelting ◽  
Functional Capabilities ◽  
Slag Regime ◽  
Furnace Slag ◽  
Furnace Smelting

The functional capabilities, methodological foundations and information software of a modernized computer system for controlling the slag regime of blast furnace smelting, developed at the Institute of Ferrous Metallurgy on the basis of fundamental principles in the physicochemical and mathematical modeling of metallurgical melts and systems based on the concept of directional chemical bonding, are considered. The system provides a predictive calculation of the complex of technological properties of the final blast furnace slag: viscosity, melting points, enthalpy, and desorption capacity. Operational assessment of the slag regime using the Slag system as part of the process control system allows efficiently and up-to-date solving the problems of optimizing the slag regime and pig iron quality under unstable blast furnace conditions

scholarly journals Analysis of possible ways to reduce sulfur content in pig iron

2021 ◽  
Vol 63 (11-12) ◽  
pp. 878-882
Author(s):  
S. V. Myasoedov ◽  
S. V. Filatov ◽  
V. V. Panteleev ◽  
V. S. Listopadov ◽  
S. A. Zagainov
Keyword(s):  
Blast Furnace ◽  
Cast Iron ◽  
Sulfur Content ◽  
Sulfur Removal ◽  
Slag Basicity ◽  
Slag Viscosity ◽  
Pig Iron ◽  
Blast Furnace Smelting ◽  
Coal Fuel ◽  
Slag Yield

One of the ways to increase the energy efficiency and intensity of blast furnace smelting, especially when using pulverized coal fuel, is to increase the hot strength of coke. In the conditions of OJSC NLMK, an oil additive was introduced into the coal charge to improve the coke quality. At the same time, sulfur content in the coke increases, and, consequently, sulfur content in the cast iron increases as well. In this regard, the task of finding ways to improve the desulfurization of cast iron in blast furnace becomes urgent. The main factors determining the desulfurization of cast iron are slag basicity, content of MgO oxide in it, temperature of the smelting products, and the slag viscosity. The purpose of this work was to compare the efficiency of sulfur removal by increasing the slag basicity and MgO content. On the basis of wellknown equations, an algorithm was developed that allows the problem to be solved. It was established that an increase in MgO content in the slag promotes desulfurization of cast iron to a greater extent than a basicity increase. In addition, an increase in MgO content by 1 % is accompanied by an increase in slag yield by 3.0 – 3.5 kg/t of cast iron. At the same time, an increase in basicity by 0.01 leads to an increase in the slag yield by 4 – 5 kg/t of pig iron. Consequently, reducing the sulfur content in pig iron by increasing the slag basicity requires less heat. In terms of the specific consumption of coke, difference in heat demand is 0.4 – 0.5 kg/t of pig iron. It is shown that with an increase in MgO content in the slag, the slag viscosity at a temperature of 1450 °C increases to a lesser extent than with an increase in basicity.

Effect of charge conditions in blast-furnace smelting on the properties of basic pig iron

Metallurgist ◽  
1975 ◽  
Vol 19 (4) ◽  
pp. 248-252
Author(s):  
E. N. Vishnyakova ◽  
B. N. Starshinov ◽  
N. I. Popova ◽  
G. G. Lukashov ◽  
Yu. V. Vyazovskii
Keyword(s):  
Blast Furnace ◽  
Pig Iron ◽  
Blast Furnace Smelting ◽  
Furnace Smelting

Blast Furnace Smelting by Water Gas

1900 ◽  
Vol 50 (1296supp) ◽  
pp. 20771-20772
Author(s):  
C. C. Longridge
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Smelting ◽  
Water Gas ◽  
Furnace Smelting

Recycling metallurgical waste in blast-furnace smelting

2007 ◽  
Vol 37 (10) ◽  
pp. 898-899 ◽  
Author(s):  
L. D. Nikitin ◽  
V. A. Dolinskii ◽  
S. A. Kudashkina ◽  
L. V. Portnov ◽  
S. F. Bugaev
Keyword(s):  
Blast Furnace ◽  
Metallurgical Waste ◽  
Blast Furnace Smelting ◽  
Furnace Smelting

Influence of the consumption of pellets with different basicity on indicators of blast-furnace smelting

2021 ◽  
pp. 4-10
Author(s):  
R. R. Dema ◽  
◽  
A. N. Shapovalov ◽  
S. N. Baskov ◽  
◽  
...  
Keyword(s):  
Blast Furnace ◽  
High Temperature ◽  
Pressure Drop ◽  
Optimal Level ◽  
Coke Rate ◽  
Specific Pressure ◽  
Blast Furnace Smelting ◽  
Gas Dynamic ◽  
Fluxed Pellets ◽  
Furnace Smelting

The results of the analysis of production data on the operation of blast furnace No. 1 (useful volume 1007 m3) of Ural Steel JSC for the period from 2013 to 2018 are presented. During this period, pellets from the Mikhailovsky GOK were used with varying degrees of fluxing: pellets of natural basicity in the ratio of CaO/SiO2 equal to 0.08 ± 0.02 units. (2013-2015) and partially fluxed pellets with a basicity of 0.52 ± 0.05 units. (from 2016 to the present). It has been established that the effectiveness of the use of pellets of various basicities is determined by their behavior in the blast furnace and depends on the proportion of pellets in the iron ore part of the charge. The gas-dynamic conditions of the smelting worsen with an increase in the proportion of pellets in the charge, which is accompanied by an increase in the specific pressure drop and forces the flow rate to be adjusted. There is an optimal level of specific pressure drop (53–55 Pa per 1 m3 of blast per minute) for the operating conditions of blast furnace No. 1 of Ural Steel, which ensures the optimum combination of the melting characteristics. Deviation from the optimal level of pressure drop leads to an increase in coke rate and a decrease in the degree of CO use, which is associated with gas distribution disturbance. Due to the increase in high-temperature properties, the replacement of non-fluxed pellets with off-fluxed pellets improves the gas-dynamic conditions in the lower part of the mine (in the cohesive zone). This leads to a decrease in the total pressure drop and specific pressure drop at a constant flow rate of the blast, and is a reserve for melting intensification. To minimize coke rate and maintain the high-performance operation of blast furnaces of Ural Steel JSC, it is necessary to work on 40–45 % of fluxed or 20–25 % acid pellets in a charge. An increase in pellet consumption while maintaining the efficiency of blast-furnace smelting is possible only if their high-temperature properties are improved. The improvement of these properties is possible as a result of optimizing the basicity and increasing the MgO content, which affects the structure and properties of the silicate bond. This work is carried out within a framework of the government order (No. FZRU-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation.

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