Reforming of Blast Furnace Gas with Methane,Steam, and Lime for Syngas Production and CO2 Capture: A Thermodynamic Study |
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| Authors: | M. Halmann A. Steinfeld |
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| Affiliation: | 1. Department of Environmental Sciences and Energy Research , Weizmann Institute of Science , Rehovot , Israel m.halmann@weizmann.ac.il;3. Department of Mechanical and Process Engineering , ETH Zurich , Switzerland;4. Solar Technology Laboratory , Paul Scherrer Institute , Villigen , Switzerland |
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| Abstract: | The production of iron and steel by the blast furnace process is a major source of CO2 release, with blast furnace gas contributing about 5% to the anthropogenic greenhouse gas emission. Its main components are CO2, CO, N2, and H2. Chemical equilibrium calculations are made to determine the thermodynamic constraints for converting these components into valuable syngas for producing hydrogen, methanol, Fischer–Tropsch hydrocarbons, or ammonia, by either reforming with CH4, water-gas shift reaction, partial oxidation, or CaO carbonation—while achieving partial or complete CO2 capture. By a two-step thermochemical cycle, the CaCO3 formed by lime carbonation could be calcined back to CaO, while releasing relatively pure CO2 for utilization. The implications of such reactions with respect to hydrogen production, CO2 emission avoidance, and process efficiency are examined. |
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| Keywords: | blast furnace gas calcination CO2-reforming exergy hydrogen production lime carbonation methanol steam-reforming syngas thermodynamics water-gas shift |
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