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Ironmaking
Название Blast furnace performance improved through optimal radial distribution of materials at the top while changing the charging pattern
DOI 10.17580/cisisr.2018.02.02
Автор S. K. Sibagatullin, A. S. Kharchenko, G. Yu. Savchenko, V. A. Beginyuk
Информация об авторе

Nosov Magnitogorsk state technical university (Magnitogorsk, Russia):

S. K. Sibagatullin, Dr. Eng., Prof., Dept. of Metallurgy and Chemical Technologies
A. S. Kharchenko, Cand. Eng., Assocoate Prof., Head of Dept. of Metallurgy and Chemical Technologies
G. Yu. Savchenko, Post-graduate, Dept. of Metallurgy and Chemical Technologies

 

Magnitogorsk Iron and Steel Works PJSC (MMK) (Magnitogorsk, Russia):

V. A. Beginyuk, Head Specialist of the Technological Group, Blast Furnace Shop

Реферат

This research looked at the performance of a 1,370 m3 blast furnace in operation at the MMK site after the percent of pellets in the iron ore charge and the ore burden radial distribution at the furnace top were simultaneously changed. In the periods studied, the percent of pellets was within 28–40%. Through changing the charging matrix, one built a burden layer at the furnace top which had different concentrations of iron ore coming from a hopper of the bell-less top (BLT) charging system through sloping chute stations, where stations No. 9–11, 6–8 and 3–5 are characterized by the following iron ore concentration (%): 85–94, 54–58 and 25–40 respectively. As a result, the authors determined what coke and iron ore distribution pattern would be optimal for a blast furnace with a compact BLT charging system depending on the amount of pellets in the burden. When pellets account for 28–30%, the amount of iron ore materials charged in the peripheral zone of the furnace with the sloping chute positioned to Stations 9–11 that proved to be optimal was 85–90%. When the amount of iron ore charged at the above stations was reduced from 94 to 90% while Stations 3-5 saw an increase from 25 to 29% and Station 2 saw a decrease from 45 to 22%, it became possible to cut the consumption of coke by raising the amount of natural gas consumed from 13.1 to 13.9 th m3/h. The natural gas hydrogen utilization rose from 32.2 to 35.4% delivering a 4.6 kg/t of iron reduction in the specific consumption of coke. A 30 to 40% rise in the amount of pellets justified the increased concentration of iron ore in the peripheral zone (from 85–90 to 93–94%). An increase from 85 to 93% made it possible to raise the consumption of natural gas by 1.2 th m3/h reaching a substitution rate of 0.85 kg/m3.

The below findings were obtained under the assignment No. 11.8979.2017/BCh of the Ministry of Education and Science of Russia.

Ключевые слова Blast furnace, charging matrix, coke, pellets, radial distribution, natural gas
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