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2011-Sustainable Industrial Processing Summit
|Publisher:||Flogen Star OUTREACH|
|ISSN:||2291-1227 (Metals and Materials Processing in a Clean Environment Series)|
Top gas recycling, combined with using oxygen rather than air, has been proposed as a way to reduce the carbon intensity of blast furnace ironmaking; it is an important part of the European ULCOS program. In the work presented here, a Rist-style blast furnace mass and energy balance was use to predict the effect of top gas recycling on the coke rate, top gas and flame temperatures, and carbon intensity. The calculated effects on coke rate and productivity agree with those quoted in ULCOS publications. However, removal of carbon dioxide from the top gas by vacuum pressure swing adsorption would be a large consumer of electricity. This would render top gas recycling blast furnaces uneconomical without a carbon tax, and would be to the detriment of vertical integration of ironmaking and steelmaking.