Prediction of Blast Furnace Thermal State in Real-Time Operation

2020 ◽  
Vol 299 ◽  
pp. 518-523
Author(s):  
Nikolay Spirin ◽  
Oleg Onorin ◽  
Alexander Istomin
Keyword(s):  
Blast Furnace ◽  
Gas Flow ◽  
Thermal State ◽  
General Description ◽  
Blast Furnaces ◽  
Hot Metal ◽  
Blast Furnace Smelting ◽  
Transition Processes ◽  
Control Actions ◽  
Time Operation

The paper gives a general description of the dynamic model of the blast-furnace process that enables to calculate transition processes of the blast furnace thermal state, evaluated by the content of silicon in hot metal. It provides calculation results of the transition processes to be subjected to changes in control actions: ore load from the top and oxygen concentration in blast, natural gas flow rate and hot blast temperature from the bottom. Specific features of these transition processes during blast-furnace smelting are analyzed. The paper shows that the dynamic characteristics of blast furnaces change are subjected to control actions and depend significantly on properties of melted raw materials and operating parameters of blast furnaces. The oscillatory transition process in the blast furnace is observed in the case after disturbance it has an opposite influence on the thermal state of the lower and uppers stages of heat exchange. The paper presents prediction results of the silicon content in hot metal. It gives practical recommendations for selection of control actions.

Analysis of hot metal desulfurization methods efficiency during titanomagnetite processing

2020 ◽  
Vol 76 (6) ◽  
pp. 543-549
Author(s):  
V. V. Panteleev ◽  
K. B. Pykhteeva ◽  
M. V. Polovets ◽  
K. V. Mironov ◽  
S. A. Zagainov
Keyword(s):  
Blast Furnace ◽  
Data Analysis ◽  
Sulfur Content ◽  
Slag Basicity ◽  
Slag Viscosity ◽  
Blast Furnaces ◽  
Hot Metal ◽  
Blast Furnace Smelting ◽  
Low Sulfur ◽  
Hot Metal Desulfurization

To make high-quality steel, it is necessary to ensure low sulfur content in the hot metal entering a steelmaking shop. The task to obtain low sulfur metal can be solved either during blast furnace smelting or its ladle desulfurization immediately after tapping out of blast furnace. Under conditions of JSC EVRAZ NTMK, the ladle desulfurization of vanadium hot metal is not applied, since it leads to a loss of vanadium. Is explained by the fat, that calcium oxide forms with V2O5 a strong calcium vanadate (3СаО·V2O5), which makes the process of vanadium recovery during further slag processing more complicated. Therefore the ladle desulfurization is accomplished after devanadation of hot metal. After the devanadation the semi-product has ions of oxygen, which makes it impossible to arrange an effective desulfurization and males it necessary to smelt the hot metal with limited sulfur content. The factors, effecting the process of hot metal desulfurization in a blast furnace, including slag basicity, MgO content in it, temperature of smelting products and slag viscosity, are presented. Dependence of distribution coefficient of sulfur on slag basicity has been shown. Research goal is pig iron desulphurization efficiency estimation by means of MgO increasing in slag. Data analysis findings about smelting products composition over 500 tappings for each of two investigated JSC EVRAZ NTMK blast furnaces have been reported. The aim of the study was comparison of hot metal desulphurization efficiency due to both slag basicity increase and MgO increase in slag. Results of data analysis on smelting products composition of over 500 heats for each of two investigated JSC EVRAZ NTMK blast furnaces have been presented. It was established that a sulfur content decrease in hot metal is achieved more effectively by MgO increase in slag. It has been shown that MgO has better desulfurizing properties, and with an increase of its content in the blast furnace slag, the overall technology for running the blast furnace process improves. It was recommended to increase the consumption of materials containing MgO while maintaining basicity at a constant level. Such a technology will allow to decrease sulfur content in hot metal, as well as will result in the process stabilization providing other conditions being equal.

scholarly journals Numerical Simulation of the Raceway Zone in Melter Gasifier of COREX Process

Processes ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 867 ◽  
Author(s):  
Ye Sun ◽  
Ren Chen ◽  
Zuoliang Zhang ◽  
Guoxi Wu ◽  
Huishu Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Blast Furnace ◽  
Gas Flow ◽  
Chemical Processes ◽  
Blast Furnaces ◽  
Two Phase ◽  
Corex Melter Gasifier ◽  
Unsteady Numerical Simulation ◽  
Physical And Chemical ◽  
Shape And Size

The physical and chemical processes in the raceway zone of the COREX melter–gasifier express are similar to those inside the blast furnace. Based on the research achievements on blast furnaces, the unsteady numerical simulation of a gas-solid two-phase in the raceway was carried out by using computational fluid software. The formation process of the raceway in the COREX melter–gasifier was simulated. The shape and size of the raceway were obtained. Then, the effect of gas flow on the depth and height of the raceway was analyzed in this paper.

Decision Support System for Controlling Thermal State of Blast Furnace Smelting

2021 ◽  
Vol 51 (4) ◽  
pp. 261-266
Author(s):  
Yu. S. Semenov ◽  
A. L. Podkorytov ◽  
E. I. Shumelchik ◽  
V. V. Horupakha ◽  
I. Yu. Semion ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Decision Support ◽  
Decision Support System ◽  
Support System ◽  
Thermal State ◽  
Blast Furnace Smelting ◽  
Furnace Smelting

Blast-furnace smelting with the production of low-silicon hot metal

2013 ◽  
Vol 43 (8) ◽  
pp. 503-507 ◽  
Author(s):  
S. V. Filatov ◽  
I. F. Kurunov ◽  
L. A. Smirnov ◽  
V. A. Kobelev ◽  
O. P. Onorin
Keyword(s):  
Blast Furnace ◽  
Hot Metal ◽  
Blast Furnace Smelting ◽  
Furnace Smelting

scholarly journals Influence of transition modes of blast-furnace smelting to change the temperature of the cooling-system plates

2018 ◽  
pp. 3-9
Author(s):  
V.V. Horupakha ◽  
Yu.S. Semenov ◽  
E.I. Schumelchyk ◽  
S.V. Vashchenko ◽  
E.D. Vyshinskaya
Keyword(s):  
Blast Furnace ◽  
Natural Gas ◽  
Thermal State ◽  
Cooling System ◽  
Furnace Operation ◽  
Operating Conditions ◽  
The Body ◽  
Blast Furnace Smelting ◽  
Operating Modes ◽  
Furnace Smelting

Purpose. Estimation of the influence of non-stationary blast-furnace smelting on the thermal state of the cooling system. Methodology. Analysis of changes in the meanings of thermocouples installed in the body of the cooling system plates, under different operating conditions of the blast furnace. Results. The study of the influence of transitional modes of blast-furnace smelting on the temperature change of the cooling-system plates at the joint use of natural gas and coal-pulverized fuel, under conditions of a low-intensity blast furnace operation and using pulverized coal with a consumption of more than 110 kg/ton of pig iron. Findings. The peculiarities of the influence of transitional modes of blast-furnace smelting on the thermal state of the cooling system are established: incl. with various fuel additives for blasting and with the operation of the furnace with reduced intensity. Practical value. The results presented in the article can be used in the design of the cooling system, as well as in the selection of rational operating modes of the blast furnace. Keywords. blast furnace, PCI technology, natural gas, cooling-system plates, thermocouple.

scholarly journals Application of computer training systems for qualification perfection of technological personal of blast furnace shops

2019 ◽  
Vol 75 (4) ◽  
pp. 448-453
Author(s):  
S. V. Filatov ◽  
A. I. Dagman ◽  
S. V. Myasoedov ◽  
S. A. Zagainov ◽  
L. Yu. Gileva
Keyword(s):  
Blast Furnace ◽  
Thermal State ◽  
Computer Training ◽  
Transient Processes ◽  
Effective Control ◽  
State Control ◽  
Hot Metal ◽  
Size Change ◽  
Heat And Mass Exchange ◽  
Training Systems

Effective control of thermal state of a blast furnace (BF), considerably depending on the qualification of the technological personal, is an important condition for smelting of hot metal of required composition. Application of computer training systems (CTS) in the process of education of technological personal of BF shops is one of the effective methods of professional knowledge and skill perfection. The CTS, implemented at PAO NLMK, based on a model of thermal state of BF, elaborated in Ural Federal University and supplemented with the models of existing disturbances. Adjusting of dynamic characteristics accomplished on the base of regularity of heat- and mass exchange. According to the tasks of BF heat operative control, during the training at the CTS transient processes are studied through channels of BF thermal state control, skill is mastered to identify the tendencies of BF thermal state change in case of non-controlled disturbances action. Most important stage of the training – implementation of adequate solutions to compensate declination of BF thermal state parameters from the set-up level. The CTS implemented at PAO NLMK is operating in the mode of training and testing. The main parameters of BF operation for every particular scenario are displayed at a mnemonic diagram, which completely corresponds to the mnemonic diagram of particular BF. Within the frame of transient processes dynamics studies, tasks are stipulated to modify a BF thermal state by application of control programs. When a scenario of BF thermal state control in case of non-controlled disturbances action is realized, the process parameters change is imitated at the mnemonic diagram. It will be done in case of one of the following parameters change: coke quality change, reducibility change, iron ore material grain size change, distribution of ore by radius change. The CTS includes a module of administration, which allows collecting the statistics of tasks fulfilment by pupils and estimating the results according to accepted algorithm. The application of CTS enabled to perfect the competence of technological personal, which was expressed by declining of off-grade hot metal share.

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