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Thermodynamic analysis of the blast furnace process under the conditions of top gas recirculation and high oxygen enrichment of the blast

Michalski Daniel, Szega Marcin

Journal of Power Technologies

2023

Vol. 103, nr 3

173--191

The blast furnace process is the dominant technology in worldwide iron metallurgy. The basic fuel in this process is coke. However, coke production is associated with several adverse environmental impacts. The reduction of coke consumption in a blast furnace can be achieved by injection of auxiliary fuels or by changing the parameters of the blast. The recirculation of the top gas into the process after CO2 and H2O removal and the high enrichment of the blast with oxygen are considered to be future technologies conducive to the reduction of coke consumption. The paper presents the influence of the above-mentioned technologies on the operating parameters of the blast furnace plant. The simulation calculations were performed using the formulated theoretical-empirical mathematical model of the blast furnace plant. The mathematical model of the blast furnace is built based on the mass and energy balances of its separated temperature zones. The balances of the elements and also the energy balance equation have been set up separately for the top zone of heat transfer and the lower zone of production together with the thermal reserve zone. The balances of elements and the energy balance also for the tuyére zone have been applied. The advanced data validation and reconciliation method to eliminate incompatibilities of selected balances of mass and energy of the temperature zones of the blast furnace for the so-called basic measurement of its raw materials and energy consumption indicators in the steady-state of operation has been applied. The carried out simulation calculations showed a significant saving of coke in the process under top-gas recirculation after CO2 and H2O removal and oxygen enrichment of the blast conditions.

Some implications of the use of alternative fuels in the blast furnace

Pustejovska P., Jursova S.

Hutnik, Wiadomości Hutnicze

2011

Vol. 78, nr 10

899--901

Paper deals with the analytical blast furnace process evaluation system. The submodels of prediction of the minimum coke consumption. The prediction methodology for the permeability limit is based on calculation of gas-dynamically minimum consumption of coke. Decreasing consumption of metallurgical coke demands a better quality of coke employed for the purpose.

Artykuł dotyczy analitycznego systemu oceny pracy wielkiego pieca. Przedstawiono submodele przewidywania minimalnego zużycia koksu. Metodologię prognozowania limitu przewiewności oparto na gazodynamicznych obliczeniach minimum zużycia koksu. Zmniejszenie zużycia koksu metalurgicznego wymaga jego lepszej jakości.

Possibilities of rationalization of the melting process proceeding in .... 700 cupola

Soiński M. S., Derda A., Skoczylas A., Zatoń B., Mierzwa P.

Archives of Foundry Engineering

2010

Vol. 10, iss. 1

153-156

An attempt of rationalization of the cast iron melting process proceeding in a cupola has been taken on, based on the working parameters recorded during the first several hours of the cupola work. Examinations have been centred around the melting process taking place in a ... 700 hot-blast cupola with a fixed receiver (forehearth). It has been found that a significant reduction in coke consumption is possible due to changes in cupola burdening without a detriment to furnace efficiency or the temperature of molten cast iron.