Investigation of the blast furnace process using multicomponent blast

Chernousov, P. I.; Seregin, Sergey Nikolaevich; Grishin, R. E.; Chikaleva, A. N.

doi:10.17580/chm.2021.12.01

Cited by 2 publications

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“…The unstable mode of blast furnace smelting, characterized by r d values less than 25 % is also indicated by the dependence of the sulfur and silicon content in pig iron on the values of the integrated iron ore quality index, which is illustrated by the data in Table 2 [5].…”

Section: Research and Resultsmentioning

confidence: 92%

“…It can be stated that technologists are striving to implement stable operating modes of blast furnaces by parameters of used charge materials and the combined hot blast. For this purpose, complex indicators characterizing the thermal and reduction modes of blast-furnace smelting, integral indicators of iron ore quality, linking the metallurgical characteristics of iron ore with the parameters of reduction, mass and heat transfer processes, and the chemical composition of iron [1][2][3][4][5] are investigated.…”

Section: Relevancementioning

confidence: 99%

“…The database of average daily performance indicators of blast furnaces No. 4, 6 and 7 of PJSC NLMK for the period from January 1, 2013 to December 31, 2018, analyzed in detail in publications [4][5][6][7][8][9], was studied. Useful volume of BF No.…”

Section: Object Of Studymentioning

confidence: 99%

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Comprehensive index of compound blast furnace smelting

Chernousov¹,

Karpalev²,

Kramar³

et al. 2022

cisisr

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An actual direction in the development of blast-furnace smelting technology is the implementation of stable operating modes of blast furnaces in terms of the parameters of the used charge materials and hot combined blast. For this purpose, complex indicators characterizing the thermal and reduction modes of blast furnace smelting, and integral indicators of iron ore raw materials (IORM) quality are being studied. The object of the study is the blast furnace process under the conditions of PJSC NLMK. The database of the main indicators of the operation of blast furnaces No. 4, 6 and 7 for the period 2013-2018 was analyzed. The furnaces operate under raw material conditions, with similar combined blast parameters and coke consumption. When the consumption of natural gas, pulverized coal and process oxygen changes, the values of the degree of compensation (the ratio of the consumption of reducing additives to the consumption of process oxygen) are in the range of 0.9-1.1. This provides a constant level of hearth heating, stability of the gas-dynamic mode of melting and coke consumption. At the same time, the different level of development of the processes of indirect (Ri) and direct (rd) reduction in blast furnaces No. 4, 6 and 7 makes it possible to perform correct studies of the features of blast furnace smelting in a wide range of Ri and rd values. It has been established that under the conditions of stable operation of blast furnaces on raw materials from sinter and pellets using combined blast, the type of dependence of the sulfur and silicon content in pig iron on the values of the integrated iron ore raw materials quality index is determined by degree development level of direct reduction processes rd. It has been established that the mode of blast furnace smelting with natural gas, pulverized coal and process oxygen, characterized by the level of rd values less than 20-25 %, is distinguished by the presence of a pronounced extreme dependence of coke consumption and productivity on the parameters of the combined blast. Key words: blast furnace smelting, iron ore raw materials, combined blast, pulverized coal fuel, integral indicator, degree development level of direct reduction processes, chemical composition of pig iron.

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Section: Research and Resultsmentioning

confidence: 92%

Section: Relevancementioning

confidence: 99%

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Comprehensive index of compound blast furnace smelting

Chernousov¹,

Karpalev²,

Kramar³

et al. 2022

cisisr

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Reduction of specific coke consumption in blast furnace by impact on thermal reverse zone

Kharchenko,

Sibagatullina,

Kharchenko

et al. 2023

Izv. vysš. učebn. zaved., Čern. metall.

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At the blast furnace of PJSC “Magnitogorsk Metallurgical Plant” (MMK), the specific consumption of coke was reduced by impact on thermal reverse zone (TRZ) by increasing the consumption of natural gas above 120 m3/t of cast iron under conditions of increased reactivity and reduced hot strength of coke. In the first pair of periods, an increase in CRI from 38.4 to 39.3 % with a decrease in CSR from 36.3 to 34.6 % was accompanied by an increase in the ratio of natural gas consumption and total oxygen entering the furnace from 0.43 to 0.45 by increasing the specific gas consumption from 123.2 to 133.5 m3/t of cast iron. The set of actions increased the TRZ length towards the blast-furnace mouth by 1.9 % with its unchanged location along the lower part. Reducing the heat consumption in the TRZ increased the temperature difference between gas and materials there by an average of 36 °С. In the second pair of periods, the consumption of natural gas was 143.9 m3/t of cast iron with a decrease in the oxygen content in the blast from 27.6 to 27.0. They were accompanied by the following changes in the processes under consideration: an increase in the length of the TRZ towards the blast-furnace mouth by 2.6 % and the distance from the tuyere hearth by 3.4 %, an increase in the degree of carbon reduction from 32.0 to 33.3 %, an insignificant (on average 0.3 °С) increase in the temperature difference of gas and materials in the TRZ. In the first pair of periods, reduction in the coke specific consumption was 4.7 kg/t of cast iron with an increase in furnace productivity by 27 t/day. Conditions and course of the processes of the second pair ensured a decrease in the coke specific consumption by 1.6 kg/t of cast iron and led to a decrease in cast iron production by 41 t/day.

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Investigation of the blast furnace process using multicomponent blast

Cited by 2 publications

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Comprehensive index of compound blast furnace smelting

Comprehensive index of compound blast furnace smelting

Reduction of specific coke consumption in blast furnace by impact on thermal reverse zone

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