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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 12
SUMMARY:Improvement design of multiple fluidized bed reduction system using blast furnace grade ore
DESCRIPTION:Fluidized bed reduction technology is one of the items in carbon neutral ironmaking because of its flexible gas input and no need for agglomeration which leads to environmental friendliness. In the case where fluidized bed reduction system is installed in an integrated steel plant, partial substitution of blast furnace ironmaking and CO2 reduction are achieved by using exhaust gas such as coke oven gas as reductant. Moreover, it helps operation of agglomeration process by using unsuitable types of ore that lowers agglomeration productivity. Hence, fluidized bed installation into steel plants is not only the possibility of hydrogen-based carbon neutral technology but also bridge technology in CO2 reduction road. A scheme of multiple fluidized bed system design for an integrated steel plant involved with mass- and heat-balance calculation has been established in former research. However, unique characteristics of ore such as dense structure or iron-bearing complex oxide formation disturb reduction reaction. Especially, the latter case is observed in using blast furnace grade ore for fluidized bed reactor. In this study, two countermeasures to increase reduction degree are proposed and evaluated experimentally. One is elimination of hematite to magnetite reduction stage to avoid structure densification. Cross sectional observation of the reduced sub-samples collected after each stage shows porous structure is formed by the countermeasure. The other is dividing first reactor into two to decrease gas oxidation degree in metallization stage. Thermodynamical study by FactSageTM reveals that required gas oxidation degree for reduction of iron-bearing complex oxide is quite low compared to reduction of pure wustite to metallic iron. These countermeasures provide increase of final reduction degree in fluidized bed reduction experiments using 160 mm inner diameter furnace.
CLASS:PUBLIC
DTSTART:20230615T141000
DTEND:20230615T143000
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