Abstract
The potential of advanced polymer or hybrid polymer membranes to reduce CO2 emissions in steel production was evaluated. For this, a conceptual process design and assessment was performed for a process that is a combination of carbon recycling and electrification of the steel making process. The results indicate a CO2 avoidance of 9%. CO2 emissions were reduced by factor 1.78 when using renewable electricity according to the proposed scheme compared to feeding this renewable electricity to the electrical grid. The CO2 abatement potential of the studied concept is highly dependent on the CO2 conversion in the plasma torch. If CO2 conversion in the plasma torch could be increased from 84.4% to 95.0%, the overall CO2 avoidance could be further increased to 16.5%, which is comparable to the values reported for the top gas recycling blast furnace. In this case, the CO2 emissions reduction achieved when using renewable electricity in the proposed scheme compared to using the same electricity in the electrical grid increases a factor from 1.78 to 3.27.
Highlights
Recycle and Electrification by MeansRecent international agreements on CO2 emission reductions facilitate the industry sector to move towards sustainable and environmentally friendly solutions
The amount of CO2 that needs to be mixed with the coke oven gas (COG) as specified by Equation (2) was found to be significantly lower than the value present in the blast furnace gas (BFG) that is typically sent to the electricity production
Advanced polymer or hybrid polymer metal-organic frameworks (MOF) CO2 separating membranes are used in the steel industry using renewable power to reduce pulverized coal injection
Summary
Recycle and Electrification by MeansRecent international agreements on CO2 emission reductions facilitate the industry sector to move towards sustainable and environmentally friendly solutions. Steel production with emissions of approximately 2.09 tCO2 /t hot metal (where t indicates metric tons) contributes significantly to the greenhouse gas (GHG) emissions of the industry sector [1]. In TGR-BF configuration, the blast furnace needs to be modified to allow the combustion of coal in the presence of pure oxygen instead of air or oxygen enriched air. In this way, BFG is rich in CO2 with low inert gas (N2 ) content. BFG is rich in CO2 with low inert gas (N2 ) content This enables easy separation of CO2 from BFG, and recycling of the CO rich stream to the blast furnace
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