Operation of a blast furnace on a charge of dolomitized pellets and calcined siderite

To use effectively internal raw material base, JSC “Ural Steel” accomplished I category major overhaul of the blast furnace No. 2. The main purpose of the overhaul was to design a rational profile which could ensure an ability to operate with a charge containing 95 % of Mikhailovskii GOK (mining and concentrating plant) pellets having basicity of 0.5 by CaO/SiO2. The blast furnace No. 2 having useful volume of 1232 m3, was constructed by design of Danieli Corus, the Netherlands, and was blown in on December 30, 2020. In the process of guarantee tests, step-by-step increase of Mikhailovskii GOK pellets (Fetotal = 60.5 %, CaO/SiO2 = 0.5) content in the charge iron ore part was being accomplished from 55 to 95.1%. Charging of the blend containing pellets in the amount of 55% of iron ore part, was done by charging system 4OOCC + 1COOCC (Ore - Coke) with filling level 1.5 m. Under conditions of pellets part increase in the blend, the charging system was changed to decrease their content at the periphery, to increase it in the ore ridge zone and make it intermediate between periphery and the ore ridge. At the pellets share in the iron ore raw materials 0.75 the charging system was used as the following: 3OOCC + 1COOC + 1COOCC, while at the content 95.1% the following charging system was used: 2COOC + 2COOC + 1COOCC. It was noted that in the period of guarantee tests the furnace running was smooth. The average silicon content in the hot metal was 0.70% at the standard deviation 0.666. Sulfur content in the hot metal did not exceed 0.024%, the blowing and natural gas consumption figures were 2100 m3/min and 11000 m3/min correspondently, oxygen content in the blowing 26.5%, hot blowing and top smoke pressure figures were 226.5 and 109.8 KPa correspondently. The productivity of the furnace was reached as high as 2358 t/day at the specific coke rate 433 kg/t of hot metal. After guarantee tests completion, the pellets content in the iron ore part was decreased gradually from 95 down to 50%. The decreasing was made by 5% in every 6 hours of operation. Application of the mastered technology of the blast furnace No. 2 with the increased share of pellets will enable to stably supply the blast furnaces No. 1, 3 and 4 by iron ore raw materials in the proportion of 30-35% of pellets and 65-70% of sinter.

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Utilization of 6- to 20-mm Waste Metallic Scrap as a Charge Material and Reduction of Carbon Rate and HM Silicon at E Blast Furnace of Tata Steel Ltd. Jamshedpur

AISTech 2021 Proceedings of the Iron and Steel Technology Conference ◽

10.33313/382/153 ◽

2021 ◽

Author(s):

D. Kumar ◽

M. Patra ◽

S. Saha ◽

B. Seal ◽

M. Tiwari

Keyword(s):

Blast Furnace ◽

Charge Material ◽

A Charge

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The Development of a Charge Movement Model for Blast Furnace Based on Extended Kalman Filter

Proceedings of 2018 Chinese Intelligent Systems Conference - Lecture Notes in Electrical Engineering ◽

10.1007/978-981-13-2288-4_63 ◽

2018 ◽

pp. 661-672

Author(s):

Jingchu Duan ◽

Weicun Zhang

Keyword(s):

Blast Furnace ◽

Kalman Filter ◽

Extended Kalman Filter ◽

Charge Movement ◽

Movement Model ◽

A Charge

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Investigation of the movement of charge materials in the tray-distributor of the cone-free loading device of the blast furnace

Theory and practice of metallurgy ◽

10.34185/tpm.2.2020.06 ◽

2020 ◽

Vol 2,2020 (2,2020 (125)) ◽

pp. 44-53

Author(s):

Selegej A ◽

Selegej S

Keyword(s):

Blast Furnace ◽

Flow Rate ◽

Analytical Calculation ◽

Particle Diameter ◽

Practical Significance ◽

Average Particle ◽

Charge Movement ◽

Charge Materials ◽

Loading Device ◽

A Charge

Objective.Determine the analytical dependence of the profile of granular materials moving on the tray-distributor of the cone-free loading device on the length coordinate. Method. Kinematic and geometrical regularities of movement of charge materials on the distributive body of the cone - free loading device of tray type are considered. It is shown that the dynamics of the flow of charge materials is significantly influenced by such factors as the value of the average particle diameter of the loaded material, physical and mechanical characteristics of the charge, its flow rate, angular velocity of the distributor tray and its angle. Results. The analysis of the obtained results makes it possible to calculate with sufficient accuracy the rate of charge rise from the tray-distributor in the furnace space of the blast furnace. This makes it possible to calculate the trajectory of the charge flow in the furnace space and to obtain the coordinate of the intersection of the trajectory with the surface of the charge backfill on the blast furnace grate. The obtained equation of the profile of the movement of charge materials on the tray-distributor makes it possible to recommend the position of the tray when loading the blast furnace, which prevents the transfer of the charge through the edge of the tray. Scientific novelty. A new method for solving the Cauchy problem for a differential equation describing the flow of a charge through a distributor tray is proposed. It is established that the change in the flow rate of charge materials passing through the tray-distributor significantly affects the configuration of the surface of the charge on the tray, and this, in turn, causes a change in the rate of flow into the furnace space. Studies have shown that the motion parameters are significantly affected by the initial height of the charge materials on the tray. Practical significance. The obtained results allow analytical calculation of the change in the dynamics of the charge movement under the condition of a constant angle of inclination of the tray of the loading device of the blast furnace. This makes it possible to expand the possibilities of automatic correction of the gas dynamics of the blast furnace zone in specific charge conditions.

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Influence of Type and Consumption of Pellets on Indicators of Blast-Furnace Smelting in the JSC Ural Steel

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.316.443 ◽

2021 ◽

Vol 316 ◽

pp. 443-448

Author(s):

Roman R. Dema ◽

Aleksey N. Shapovalov ◽

Aleksandr A. Kal'chenko

Keyword(s):

Blast Furnace ◽

Iron Ore ◽

Production Data ◽

Structure And Properties ◽

Specific Pressure ◽

Blast Furnace Smelting ◽

Increase Rate ◽

A Charge ◽

Fluxed Pellets ◽

Furnace Smelting

The article presents the results of the analysis of production data on the operation of the blast furnace No. 1 of Ural Steel JSC for the period from 2013 to 2018. During this period, the Mikhailovsky GOK pellets with different basicities were used. It has been established, that the effectiveness of the use of pellets of different basicities is determined by their behavior in a blast furnace and depends on the proportion of pellets in the iron ore part of the charge. The gas-dynamic conditions of melting deteriorate 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 blast rate, to be adjusted. It is necessary to work on 40-45% of fluxed pellets and 20-25% acid pellets in a charge at a blast rate of 2000-2100 m3/min, to minimize coke rate and increase rate of work of blast furnace No. 1 of Ural Steel JSC. An increase in pellet consumption is possible while maintaining the efficiency of blast-furnace smelting only if their high-temperature properties are improved, as a result of optimization of basicity and increase in MgO content, which affects the structure and properties of the silicate binder.

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