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• W3193569638 abstract "Ironmaking and steelmaking are resource- and energy-intensive industries and major sources of CO 2 emissions. We investigated the use of recycled CO 2 gas to replace some of the air in the hot blast under smelting conditions in a blast furnace. CO 2 reacts with carbon in the raceway zone; hence, a kinetic model of the CO 2 -enriched hot blast reaction with coke in the raceway zone was established. At the end of the raceway and its influence area, newly added CO 2 gas reacts with carbon to form CO gas. A blast furnace mass and energy balance calculation model was established by assuming that all CO 2 gas reacted to produce CO gas in the raceway zone based on the above conclusion. These CO molecules were oxidized into CO 2 gas by the indirect reduction of iron ore in the middle and upper parts of the blast furnace; the conversion ratio from newly added CO 2 to CO at the top of the blast furnace was approximately 50%. The conversion of CO 2 to CO gas absorbed physical heat, which cooled the furnace; this may affect the normal operation of the blast furnace. Therefore, before using CO 2 gas to replace part of the air in the blast furnace, it is necessary to evaluate the heat conditions of the blast furnace. To partially offset this heat loss, three heat supplementation methods were compared. For every 1% increase in the CO 2 enrichment rate, the coke ratio needs to be increased by approximately 5 kg/THM, the hot blast temperature needs to be increased by approximately 65 °C, or the coal ratio needs to be increased by approximately 5.5 kg/THM." @default.
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• W3193569638 date "2021-10-01" @default.
• W3193569638 modified "2023-10-16" @default.
• W3193569638 title "Modeling on the blast furnace with CO2-enriched hot blast" @default.
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• W3193569638 doi "https://doi.org/10.1016/j.jclepro.2021.128690" @default.
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