Title

STUDY OF THE USE OF SYNTHETIC NATURAL GAS(SNG) INTO CHARCOAL MINI BLAST FURNACE BY THE FOUR FLUID MODEL

STUDY OF THE USE OF SYNTHETIC NATURAL GAS(SNG) INTO CHARCOAL MINI BLAST FURNACE BY THE FOUR FLUID MODEL

Authorship

Castro, Jose Adilson de; Guilherme, Vagner Silva; França, Alexandre Bôscaro; Sazaki, Yasushi; Yagi., Jun-ichiro

Castro, Jose Adilson de

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Guilherme, Vagner Silva

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França, Alexandre Bôscaro

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Sazaki, Yasushi

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Yagi., Jun-ichiro

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DOI

10.5151/2594-357X-22099

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Abstract

In the Brazilian domestic market, the synthetic natural gas(SNG) has been available for large consumers. Initially the SNG has been considered to be used at facilities on the semi integrated mini mills based on electric furnace. However to study new possibilities of use of SNG on the ironmaking industries is important and can be an alternative to expensive installations of pulverized coals. Theoretically the injection of synthetic gas on the tyueres of small blast furnace based on biomass can enhance the competitiveness of the hot green pig iron production due to its possibility of considerable decrease of the granular charcoal consumption, increase in productivity and enhancement of combustion in the raceway in addition to the decrease of specific CO2 emissions. This model treats the blast furnace as a multi-phase reactor and four phases are considered simultaneously: gas, lump solids (raw iron ore, sinter, pellets and granular charcoal), hot metal and molten slag. The model is based on conservation equations for mass, momentum, energy and chemical species numerically solved based on the finite volume method. The SNG has high amount of H2 and strongly effects the inner conditions of the reactor and only a comprehensive model with detailed chemical reaction rates can properly predict the inner conditions of the process and hence furnish useful information to design smooth operational conditions. The simulation results indicated that smooth operations up to 25 Nm3/tof pig iron can be considered with increase on the productivity up to 58%.

In the Brazilian domestic market, the synthetic natural gas(SNG) has been available for large consumers. Initially the SNG has been considered to be used at facilities on the semi integrated mini mills based on electric furnace. However to study new possibilities of use of SNG on the ironmaking industries is important and can be an alternative to expensive installations of pulverized coals. Theoretically the injection of synthetic gas on the tyueres of small blast furnace based on biomass can enhance the competitiveness of the hot green pig iron production due to its possibility of considerable decrease of the granular charcoal consumption, increase in productivity and enhancement of combustion in the raceway in addition to the decrease of specific CO2 emissions. This model treats the blast furnace as a multi-phase reactor and four phases are considered simultaneously: gas, lump solids (raw iron ore, sinter, pellets and granular charcoal), hot metal and molten slag. The model is based on conservation equations for mass, momentum, energy and chemical species numerically solved based on the finite volume method. The SNG has high amount of H2 and strongly effects the inner conditions of the reactor and only a comprehensive model with detailed chemical reaction rates can properly predict the inner conditions of the process and hence furnish useful information to design smooth operational conditions. The simulation results indicated that smooth operations up to 25 Nm3/tof pig iron can be considered with increase on the productivity up to 58%.

Keywords

Synthetic natural gas(SNG); Modeling;Biomass; Mini blast furnace.

Synthetic natural gas(SNG); Modeling;Biomass; Mini blast furnace.