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THERMODYNAMIC JUSTIFICATION OF OPPORTUNITY OF USING HIGH-TEMPERATURE COMBUSTION FLANKS FOR OXIDATION OF MELT IMPURITIES IN AGGREGATES OF CONVERTER TYPE. REPORT 1. THERMODYNAMIC ANALYSIS OF PROCESSES IN COMBUSTION FLAME WHEN USING NATURAL GAS

https://doi.org/10.17073/0368-0797-2017-7-556-564

Abstract

Increase in productivity and reduction of resource and energy capacity in steel production in converters predetermine development of technological measures and improvement of design of aggregates providing preheating of scrap and other charge materials, intensification of afterburning of waste gases in working space of steelmaking unit and redox processes in liquid bath while maintaining satisfactory durability of blowing devices and lining of the converter. Using fuel-oxygen combustion flames in converter process allows solving a number of multi-purpose technological problems. Combustion of fuel in working space of converter during formation of jet or use of submerged combustion flames significantly changes hydrodynamic pattern in reaction zones and liquid bath. Thermodynamic methods have been used to determine dynamics of combustion processes of gaseous fuels and oxidation of converter bath elements during their interaction with high-temperature flame combustion products. Calculation of the process of flame interaction with chemical elements of the bath was carried out for equilibrium conditions. It was established that use of combustion flames changes composition of gas phase in working space of converter, in which H2 and H2O are formed in addition to those traditionally present when oxygen is blown with O2 , CO, and CO2 . Presence of these gases changes thermal regime and oxidizing ability of the gas phase. When burning gas-oxygen fuel, optimal composition of initial gas mixture (natural gas + oxygen) should correspond to a ratio of 100  %  CH4   +  69  %  O2 , while a vapor-gas phase containing 40  % of CO2 and 60  % of H2O is formed as a product of oxidation reactions. The total enthalpy of gas-oxygen fuel combustion at converter melting temperatures with oxygen excess ratio of more than 1.0 (up to 2.0) is approximately 200  kJ/mole of the initial reagents, with methane oxidation by carbon dioxide (–7) ÷ (–14.5) KJ/mole of initial reagents) at 1800  K and the process becomes endothermic at temperatures over 2000  K (ΔH2200 = (+7.7) ÷ (15.4) kJ/mole); with water vapor gas oxidation (ΔH1800  –  2200 = (+19.5) ÷ (+70) kJ/mole of the initial reagents. Therefore, only when the methane is oxidized with oxygen temperature of flame can be more than 1800 K. Use of carbon dioxide, water vapor as an air oxidizer does not give necessary thermal effect. 

About the Authors

V. V. Solonenko
Siberian State Industrial University
Russian Federation
Candidates for a degree of Сand. Sci. (Eng.) of the Chair of Ferrous Metallurgy


E. V. Protopopov
Siberian State Industrial University
Russian Federation
Dr. Sci. (Eng.), Professor of the Chair of Ferrous Metallurgy, Rector


S. V. Feiler
Siberian State Industrial University
Russian Federation
Cand. Sci. (Eng.), Acting Head of the Chair of Ferrous Metallurgy


N. F. Yakushevich
Siberian State Industrial University
Russian Federation
Dr. Sci. (Eng.), Professor – Consultant of the Chair “Non-ferrous Metallurgy and Chemical Engineering”


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Solonenko V.V., Protopopov E.V., Feiler S.V., Yakushevich N.F. THERMODYNAMIC JUSTIFICATION OF OPPORTUNITY OF USING HIGH-TEMPERATURE COMBUSTION FLANKS FOR OXIDATION OF MELT IMPURITIES IN AGGREGATES OF CONVERTER TYPE. REPORT 1. THERMODYNAMIC ANALYSIS OF PROCESSES IN COMBUSTION FLAME WHEN USING NATURAL GAS. Izvestiya. Ferrous Metallurgy. 2017;60(7):556-564. (In Russ.) https://doi.org/10.17073/0368-0797-2017-7-556-564

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